40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log, Page 122 of 341  Not logged in ELOG logo
ID Date Author Type Categoryup Subject
  6163   Tue Jan 3 20:42:05 2012 Leo SingerUpdateGeneralActuators for Stewart platform

 I checked on the two single-axis shakers that are present at the 40m that Steve pointed out:

  • Brüel & Kjær type 4809, rated for 45 N peak, and
  • Brüel & Kjær type 4810, rated for 10 N peak.

Neither of these meet the force requirement of 2.04 kN peak.

  6165   Wed Jan 4 02:43:40 2012 ranaUpdateGeneralActuators for Stewart platform

Quote:

 I checked on the two single-axis shakers that are present at the 40m that Steve pointed out:

  • Brüel & Kjær type 4809, rated for 45 N peak, and
  • Brüel & Kjær type 4810, rated for 10 N peak.

Neither of these meet the force requirement of 2.04 kN peak.

 Time to lower your expectations!

Do we really need 40 microns at 500 Hz? Or perhaps should there be a frequency dependent displacement requirement?

  6172   Thu Jan 5 09:08:48 2012 steveUpdateGeneralframebuilder is back

Dataviewer is recovered after heavy new year party.

Attachment 1: dataviewerisback.png
dataviewerisback.png
  6178   Fri Jan 6 19:17:07 2012 Max De JongUpdateGeneralMounted projector

I mounted the new projector to the pipe where the old projector was attached. The mounting hardware wasn't designed for attaching to a pipe, but with Steve's help I mounted the projector. The projector is angled away from the area of the wall designated as the screen, and I am going to meet with Steve Monday to fix this.

  6186   Wed Jan 11 21:35:33 2012 Max De JongUpdateGeneralProjector

I finished mounting the new projector. The projector and computer monitor now display information.

  6219   Tue Jan 24 13:36:05 2012 ZachBureaucracyGeneralIf I'm Peter Pan...

jamie_rufio.png

JA - MIE - RO!

  6250   Fri Feb 3 17:31:09 2012 steveUpdateGeneralgreen welding glass

Schott, green welding glass, shade 14, 3 mm thick  was measured in the beam path of 1.2W, S polarization of 1064nm at ~1 mm diameter size as MC reflected path.

Absorption 95%, R 5% at incident angle 25-50 degrees. It looks like the perfect material for beam trap.

 

Attachment 1: 02031202.JPG
02031202.JPG
  6254   Fri Feb 3 20:58:56 2012 SteveConfigurationGeneralIlluminator Picture
Attachment 1: P1080526.JPG
P1080526.JPG
  6280   Tue Feb 14 17:09:05 2012 steveUpdateGeneralreflectivity of green welding glass

 Schott, Athermal green welding glass, shade #14 reflectivity was measured in 1.2W,  ~1 mm diameter  beam of MC reflected.

The P polarization measurement  was done with the help of half wave plate and PBC

 

 

Attachment 1: gg#14ref.pdf
gg#14ref.pdf
Attachment 2: gg14refl1Wps.png
gg14refl1Wps.png
  6412   Wed Mar 14 05:26:39 2012 interferomter tack forceUpdateGeneraldaytime tasks

The following tasks need to be done in the daytime tomorrow.

  • Hook up the DC output of the Y green BBPD on the PSL table to an ADC channel (Jamie / Steve)
  • Install fancy suspension matrices on PRM and ITMX [#6365] (Jenne)
  • Check if the REFL165 RFPD is healthy or not (Suresh / Koji)
    • According to a simulation the REFL165 demod signal should show similar amount of the signal to that of REFL33.
    • But right now it is showing super tiny signals [#6403]
  6416   Wed Mar 14 14:09:01 2012 interferomter tack forceUpdateGeneraldaytime tasks

Quote:

The following tasks need to be done in the daytime tomorrow.

  • Hook up the DC output of the Y green BBPD on the PSL table to an ADC channel (Jamie / Steve)
  • Install fancy suspension matrices on PRM and ITMX [#6365] (Jenne)
  • Check if the REFL165 RFPD is healthy or not (Suresh / Koji)
    • According to a simulation the REFL165 demod signal should show similar amount of the signal to that of REFL33.
    • But right now it is showing super tiny signals [#6403]

 For ITMX, I used the values from the conlog:

2011/08/12,20:10:12 utc 'C1:SUS[-_]ITMX[-_]INMATRIX'
These are the latest values in the conlog that aren't the basic matricies.  Even though we did a round of diagonalization in Sept, and the 
matricies are saved in a .mat file, it doesn't look like we used the ITMX matrix from that time.

For PRM, I used the matricies that were saved in InputMatricies_16Sept2011.mat, in the peakFit folder, since I couldn't find anything in the Conlog other than the basic matricies.

 

UPDATE:  I didn't actually count the number of oscillations until the optics were damped, so I don't have an actual number for the Q, but I feel good about the damping, after having kicked POS of both ITMX and PRM and watching the sensors.

  6418   Wed Mar 14 16:39:02 2012 SureshUpdateGeneralREFL165 signal was not reaching demod board : Fixed

Quote:

The following tasks need to be done in the daytime tomorrow.

  • Hook up the DC output of the Y green BBPD on the PSL table to an ADC channel (Jamie / Steve)
  • Install fancy suspension matrices on PRM and ITMX [#6365] (Jenne)
  • Check if the REFL165 RFPD is healthy or not (Suresh / Koji)
    • According to a simulation the REFL165 demod signal should show similar amount of the signal to that of REFL33.
    • But right now it is showing super tiny signals [#6403]

 The REFL165 RF output was not reaching the Demod board.  The RF cable was disconnected.  I fixed that and then I put in a RF signal at 165MHz , 1.66 mVrms at the test input  (100Hz off set from the 165MHz LO) and saw that the 100 Hz demodulated signal was visible in the dataviewer. 

Test_CDS_Calibration.png

 

Will complete the Optical RF power -> CDS counts calibration tomorrow morning. 

  6473   Fri Mar 30 17:37:09 2012 steveUpdateGeneralcutting green welding glass for beam dumps

Quote:

Schott, green welding glass, shade 14, 3 mm thick  was measured in the beam path of 1.2W, S polarization of 1064nm at ~1 mm diameter size as MC reflected path.

Absorption 95%, R 5% at incident angle 25-50 degrees. It looks like the perfect material for beam trap.

 

 The CIT Chemistry Glass Shop cuts turned out to be sloppy using diamond disc blade  cutter.

East coast Precision Glass & Optics  offered scribed cut and polished side. Their quote price was high and time consuming.

The GLASS HOUSE  shop in Pasadena 626 / 796-9151 on Walnut did a good and cheap job. Oscar the cutter will finish the rest of the cutting by next Friday, April 6

He used scribed cutting technic and his 1" x  0.5"  pieces are good. Bob will pick up them up.

Attachment 1: IMG_0096.JPG
IMG_0096.JPG
  6500   Fri Apr 6 19:40:57 2012 Mike J.SummaryGeneralLaser Emergency Shutoff

I accidently shut off the laser at 19:34 with the emergency shutoff button while trying to tap into a video line for the Sensoray device.

  6501   Fri Apr 6 20:05:12 2012 JamieSummaryGeneralLaser Emergency Shutoff

We reset the interlock and restarted the PSL.  The end AUX lasers seem to have come back online fine.  PMC and mode cleaner locked back up quickly.

  6520   Wed Apr 11 16:33:16 2012 JenneBureaucracyGeneral40m Meeting Action Items

Action Items from Last Week:

(non-existant)

-----------------------------------------------------------------------

Action Items this Week and LEAD PERSON:

Assemble and ship 4 TTs from LHO - SURESH

Prepare electronics for TTs (coil drivers) - JAMIE

In-air TT testing to confirm we can control / move TTs before we vent (starting in ~2 weeks) - SURESH

Connect TTs to digital system and controls, lay cables if needed - JAMIE with SURESH

OAF comparison plot, both online and offline, comparing static, adaptive and static+adaptive - DEN

Static-only OAF noise budget (Adaptive noise budget as next step) - DEN

Black glass: big baffle pieces to clean&bake, get small pieces from Bob, put into baskets, make new basket for 1" pieces, get to clean&bake - KOJI

IPPOS beam measurement - SURESH with JENNE

AS beam measurement (if beam is bright enough) - SURESH and JENNE

Mode matching calculations, sensitivity to MC waist measurement errors, PRM position - JENNE

Summary of IFO questions, measurements to take, and game plan - JENNE

Think up diagnostic measurement to determine mode matching to PRC while chambers are open, while we tweak MMT - JAMIE, JENNE, KOJI, SURESH

  6521   Wed Apr 11 17:56:26 2012 JenneUpdateGeneralSummary of things to figure out with the IFO

Questions:

Power recycling gain

   * It should be ~40, but we observe/measure it to be ~7.  Even if mode matching of ~50% is assumed, gain is calculated to be ~15

   * Would like to measure PR gain independent of mode matching, if possible

Power recycling cavity mode matching

   * Reflectivity of PRMI was measured to be ~50%.  That's pretty high.  What's going on?

   * Even if we're mode matched to the arm, are we appropriately mode matched to the PRC?

Is beam from MC clipped in the Faraday?

   * We had to use MC axis for input pointing since PZTs aren't totally working.

   * Need to measure IPPOS beam for different MC alignments to see if horizontal waist measurement stays constant.

PRM flipped?

   * Not likely, but it can't hurt to confirm for sure.

   * Want to know, since it could give us a different plan for MMT moving than if the PRM is correct.

Thick optic non-normal incidence in IPPO - does this exaggerate astigmatism, which would help explain IPPOS measurement?

Is PRC waist same size / position as arm cavity waist, given the current "known" positions of all the optics?

   * How is this effected by moving the PRM?

------------------------------------------------------------------------------------

Measurements to take and what information they give us:

IPPOS beam scan, with MC as-is

   * Confirm (or not) IPPOS measurements from last week

IPPOS beam scan with different MC alignments

   * Will tell us about Faraday clipping, if any

AS beam scan, misaligned PRM, misaligned SRM, misaligned ITMX, single bounce from ITMY

   * Can only take this measurement if beam is bright enough, so we'll just have to try

   * Will confirm IPPOS measurement, but includes going through the thick PRM, so can compare to calculated intra-PRC mode

REFL beam scan (already done....is the data satisfactory? If so, no need to redo), single bounce off of PRM

   * Will tell us about the potential PRM flipping

   * Need to compare with calculated mode at REFL port for flipped or non-flipped PRM

Look at POP camera, see 2nd pass through cavity

   * Try to match 1st and 2nd pass.  If they don't match, we're not well matched to PRC mode

Look at beam directly on ETMY cage, then beam from ETM, bounce off ITM, back to ETM cage

   * If the beams are the same size, we're well matched to arm cavity mode

   * Use fancy new frame-grabber.

----------------------------------------------------------------------------

MMT code things to calculate, and what information it gives us:

REFL beam path, for PRM flipping comparison

Thick IPPO non-normal incidence - I'm not sure how to do this yet, since I only know how non-normal incidence changes effective radii of curvature, and this is a flat optic, so *cos(theta) or /cos(theta)  won't do anything to an infinite RoC

Compare PRC waist to arm cavity waist, using "known" optic positions

Mode matching sensitivity to MC waist measurements

Mode matching sensitivity to PRM position

  6542   Wed Apr 18 08:53:50 2012 JamieUpdateGeneralPower outage last night

Apparently there was a catastrophic power failure last night.  Bob says it took out power in most of Pasadena.

Bob checked the vacuum system when he got in first thing this morning and everything's back up and checks out.  The laster is still off and most of the front-end computers did not recover.

I'm going to start a boot fest now.  I'll be able to report more once everything is back on.

  6543   Wed Apr 18 10:05:40 2012 JamieUpdateGeneralPower outage last night

All of the front-ends are back up and I've been able to recover local control of all of the opitcs (snapshots from saturday). Issues:

  • I can't lock the PMC.  Still unclear why.
  • there are no oplev signals in MC1, MC2, and MC3
  • Something is wrong with PRM.  He is very noisy.  Turning on his oplev servo makes him go crazy.
  • There are all sorts of problems with the oplevs in general.  Many of the optics have no oplev settings.  This is probably not related to the power outage.

On a brighter note, ETMX is damped with it's new RCG 2.5 controller!  yay!

  6544   Wed Apr 18 11:46:14 2012 JenneUpdateGeneralPower outage last night

Quote:

  • there are no oplev signals in MC1, MC2, and MC3
  • Something is wrong with PRM.  He is very noisy.  Turning on his oplev servo makes him go crazy.

 None of the 3 MC optics have oplevs, so there shouldn't be any oplev signals. Although MC2 has the trans QPD, which was once (still is??) going through the MC2 oplev signal path.

PRM was noisy last week too.  But turning on his oplev shouldn't make him crazy. That's not so good. Try restoring PRM (the ! near the PRM label on the IFO align screen), then checking if his oplev is ~centered.  Maybe PRM wasn't in the nominal position at the time you restored from.

  6545   Wed Apr 18 11:54:31 2012 JenneUpdateGeneralPower outage last night

Quote:

None of the 3 MC optics have oplevs, so there shouldn't be any oplev signals. Although MC2 has the trans QPD, which was once (still is??) going through the MC2 oplev signal path.

 Duh.  Unawake brain.  The MCs look fine.

  6549   Thu Apr 19 09:45:43 2012 SureshUpdateGeneralMC2 Oplev signals redirected for use in WFS servo

Quote:

 
Quote:
  • there are no oplev signals in MC1, MC2, and MC3

 None of the 3 MC optics have oplevs, so there shouldn't be any oplev signals. Although MC2 has the trans QPD, which was once (still is??) going through the MC2 oplev signal path.

.......

 

The MC2 Oplev signal path has been modified in the c1mcs model.  The ADC channels have been sent over the rfm into c1ioo model and are currently used in the WFS servo loops.  Please see this elog 5397.

 

  6595   Thu May 3 13:07:05 2012 KojiBureaucracyGeneralInterferometer check-up session

From 2PM, Jenne/Den/Koji. Finished at 10:30PM

  • General
    • More LCD screens! Wider screens!
      • Allegra - only can handle single head right now, but should prepare for the eventual upgrade of that videocard/whole computer and get 2 monitors.
      • Every workstation should have 2 24" monitors.  We currently have 2 good ones (one on Rossa, one on Pianosa), so we need 6.
    • Remove Control room shelf currently holding OSA 'scopes
    • Adjust both TV shelves so that they're at the same height, ~6" higher than the current left shelf.
      This gives space for stacking the 24" monitors for each computer.
    • Audio system for the signals!!!! Even a crappy one!
           /cvs/cds/ligo/centos5.5/cds/project/gds-2.14.2/Monitors/rockIFO
           /cvs/cds/gds/gds/Monitors/rockIFO
           (really /cvs/cds, not /opt)

  • IOO
    • PZT or Picomotor mounts for PSL/ALS beams
    • ALS on the both arm simultaneously / common/diff ALS scripts
  • SUS
    • PRM OPLEV servos are sometimes not stable. (fixed, JCD/DM/KA, 5/2/2012)
    • ETMX oplev - replace 1064nm lens with 632nm lens (KBC037, -100)
  • IFO
    • It seems that there is an occasional common-mode power transient in the arm transmissions.
      -> Track down the cause and fix.
    • Fix arm ASS even on CentOS
    • Drift of the green incident axis -> Assess the amount of the drift / replace the mount
    • Calibration of POP22 / AS110
    • PMC/IMC/ARM characterization (loss, finesse, reflectivity, etc)
  • CDS
    • Capture OSA signals in CDS (the 'scope TDS1001B has a USB port in the back for connecting to the computer)
    • Transmon (arms) for high and low power
    • POX11 whitening is not toggling the analog whitening???
    • CentOS machines cannot open simulink models properly (get "Bad Link"s everywhere, so you can't do anything useful).
    • Dataviewer and DTT can't connect to framebuilder from CentIOS machines
  • Electronics
    • Actuator noise level characterization (coil driver response in V/m & coil driver noise level V/rtHz)
    • Beat box
    • I/Q DFD
    • Improvement of POP22/110/AS110 RF circuits.
  • MEDM
    • OL alert in the watch dog screen (this is awesome!) should have small text saying "OL" (done, JCD, 5May2012)
    • Complete 40m overview screen - everything should be clickable with pseudo 3D icons
    • BETTER SUSPENSION SCREEN!!!
    • Script to generate a MEDM tree
    • Resurrect MEDM snapshots
       
    • The LSC screen has some "white" boxes -> investigate and fix them (done, KA, 5/2/2012)
    • Make the LSC control screen (compact) in the vertical arrangement (done, KA, 5/2/2012)
    • The signals of the watch dog screen should go red if any of the WDs are not enabled.
      =>Copy the logic of the signals in LSC screen.
      (done, KA, 5/2/2012)
    • Remove c1gfd from the cds status screen (done, KA, 5/2/2012)
    • Add "BURT" status indicators on the cds status screen (done, KA, 5/2/2012)
  • SCRIPT
    • Locking scripts with integrator triggers / disabling when unlocked
    • Daily diagnosis of the MC spot positions (there must be something already...)
    • Daily/occasional adjustment of the incident axis on the MC
    • Suspension "misalign/restore" script is too wild => make a new script (Done, JCD, 7May2012)
    • IFO_CONFIGURE scripts still do a burt restore, so step the optics.  Need to remove optic alignment from config .snap files, use reg restore script instead.
    • OPLEV/OSEM trending script before the IFO work for diagnosis.
    • Auto-locker for PMC/Arm/etc
  • Video
    • If each video screen has a caption, that would be great
    • GUI interface of "videoswitch" Mike!
    • Mouse Jiggler for Zita (called Swinput?)
  • Ubuntu
    • burttoday is not aliased in ubuntu. burttoday:      aliased to cd /opt/rtcds/caltech/c1/burt/autoburt/today/
    • ASS doesn't run on Ubuntu!
      ezcawrite: error while loading shared libraries: libca.so: cannot open shared object file: No such file or directory
      ezcaswitch: error while loading shared libraries: libca.so: cannot open shared object file: No such file or directory
       
  6597   Thu May 3 13:35:56 2012 JenneBureaucracyGeneral40m Meeting Action Items

Action Items:

IFO:

         Arm cavity sweeps, mode scan - JENNE

        Align AS OSA (others?) - JENNE       

        Investigate PRMI glitches, instability (take PRM oplev spectra locked, unlocked, to see if PRM is really moving) - KOJI, JENNE, DEN

         Connect up beatbox for Xarm use - KOJI with JENNE       

 

TT:

Prepare electronics for TTs (coil drivers) - JAMIE

In-air TT testing to confirm we can control / move TTs before we vent (starting in ~2 weeks) - SURESH

Connect TTs to digital system and controls, lay cables if needed - JAMIE with SURESH

OAF:

OAF comparison plot, both online and offline, comparing static, adaptive and static+adaptive - DEN

Static-only OAF noise budget (Adaptive noise budget as next step) - DEN

Build amplifiers for new small microphones - DEN 

SLC:

Black glass: to clean&bake - KOJI

Scattered light measurement at the end stations: design / confirmation of the mechanical parts/optics/cameras - JAN

MM:

IPPOS beam measurement - SURESH with JENNE

AS beam measurement (if beam is bright enough) - SURESH and JENNE

Mode matching calculations, sensitivity to MC waist measurement errors, PRM position - JENNE

Think up diagnostic measurement to determine mode matching to PRC while chambers are open, while we tweak MMT - JAMIE, JENNE, KOJI, SURESH

Computers:

       Upgrade Rossa, Allegra to Ubuntu, make sure Dataviewer and DTT work - JAMIE

 

  6601   Thu May 3 22:37:44 2012 JenneUpdateGeneralOpLev 90-day trend

After fixing the PRM tonight, all of the oplevs look okay. 

.....except ITMX, which looks like it's power dropped significantly after the CDS upgrade.  To be investigated tomorrow.

Attachment 1: OpLevTrends_90days_Ending3May2012
  6602   Fri May 4 17:44:42 2012 JenneUpdateGeneralOpLev 90-day trend

Quote:

After fixing the PRM tonight, all of the oplevs look okay. 

.....except ITMX, which looks like it's power dropped significantly after the CDS upgrade.  To be investigated tomorrow.

 I had a look-see at ITMX's oplev.  I can't see any clipping, so maybe the power is just low?  One thing that was funny though is the beam coming directly from the laser.  There is the main, regular beam, and then there is a thin horizontal line of red light also coming straight out of the laser.  I don't know what to do about that, except perhaps put an iris right after the HeNe, to block the horizontal part?  I'm not sure that it's doing anything bad to the optic though, since the horizontal part gets clipped by other optics before the beam enters the vacuum, so there is no real irregularity on the beam incident on the QPD.

I realigned the oplev on the QPD, using last night's ITMX alignment + whatever drift it picked up over night, so it may need re-recentering after Xarm is nicely aligned.

  6621   Tue May 8 03:38:28 2012 JenneUpdateGeneralMEDM svn emergency!!!

We officially are *failures* at svn-ing our scripts and screens.  This is NOT OKAY.  I checked in a few things, since there were already folders on the svn, but many things don't have folders created.  It's a hot mess.  We need to get our shit together, and become as disciplined about MEDM and scripts as we have been (under Jamie's watchful eye) of the simulink models.

I'm not going to start fixing it all right now.  It might not even happen at this point until after GWADW, but it needs to happen.

  6636   Wed May 9 15:50:13 2012 JenneBureaucracyGeneral40m Meeting Action Items

I'm combining the IFO check-up list (elog 6595) and last week's action items list (elog 6597).  I thought about making it a wiki page, but this way everyone has to at least scroll past the list ~1/week.

Feel free to cross things out as you complete them, but don't delete them.  Also, if there's a WHO?? and you feel inspired, just do it!

PRIORITY ITEMS:

Dither-align arm to get IR on actuation nodes, align green beam - JENNE

Arm cavity sweeps, mode scan - JENNE

ASS doesn't run on Ubuntu! or CentOS Fix it! - JENNE, JAMIE's help

Input matricies, output filters to tune SUS.  check after upgrade. - JENNE

POX11 whitening is not toggling the analog whitening??? - JAMIE, JENNE, KOJI

OAF comparison plot, both online and offline, comparing static, adaptive and static+adaptive - DEN

 

THE FULL LIST:

  • General
    • Revamp control room - more monitors, maybe move TV shelves. - JENNE
    • Audio system for the signals!!!! Even a crappy one! - LEO
  • SUS
    • ETMX oplev - replace 1064nm lens with 632nm lens (KBC037, -100) - JENNE
    • Input matricies, output filters to tune SUS.  check after upgrade. - JENNE
  • IFO
    • Fix occasional common-mode power transient in the arm transmissions. Probably an alignment thing. Would ISS help? - WHO??
    • Drift of the green incident axis -> Assess the amount of the drift / replace the mount - JENNE, KOJI
    • Calibration of POP22 / AS110 - JENNE
    • PMC/IMC/ARM characterization (loss, finesse, reflectivity, etc) - JENNE
    • Dither-align arm to get IR on actuation nodes, align green beam - JENNE
    • Arm cavity sweeps, mode scan - JENNE
    • Align AS OSA (others?) - JENNE  
    • Investigate PRMI glitches, instability - JENNE
    • PZT or Picomotor mounts for PSL/ALS beams - WHO??
    • ALS on the both arm simultaneously / common / diff ALS scripts - JENNE
  • CDS
    • Capture OSA signals in CDS (the 'scope TDS1001B has a USB port in the back for connecting to the computer) - WHO??
    • Transmon (arms) for high and low power - WHO??
    • POX11 whitening is not toggling the analog whitening??? - JAMIE, JENNE, KOJI
    • Install guardians to monitor EPICS values - WHO??
  • Electronics
    • Actuator noise level characterization (coil driver response in V/m & coil driver noise level V/rtHz) - WHO??
    • Beat box - KOJI
    • I/Q DFD - WHO??
    • Improvement of POP22/110/AS110 RF circuits. - WHO??
  • MEDM
    • Complete 40m overview screen - everything should be clickable with pseudo 3D icons - JENNE
    • Better suspension screen - copy from sites. - WHO??
    • Script to generate a MEDM tree - WHO??
    • Resurrect MEDM snapshots - WHO??
    • New ! buttons on every screen, include wiki page - WHO??
  • SCRIPT
    • Locking scripts with integrator triggers / disabling when unlocked - JENNE
    • Daily diagnosis of the MC spot positions (there must be something already...) - SURESH?
    • Daily/occasional adjustment of the incident axis on the MC - SURESH?
    • IFO_CONFIGURE scripts still do a burt restore, so step the optics.  Need to remove optic alignment from config .snap files, use reg restore script instead. - JENNE
    • OPLEV/OSEM trending script before the IFO work for diagnosis. - JENNE
    • Auto-locker for arms - JENNE
    • Auto-locker for PMC, PSL things - DEN
    • Diagnostic script for CDS - mx_stream, other stuff. - WHO??
  • Video
    • If each video screen has a caption, that would be great - WHO??
    • GUI interface of "videoswitch" - MIKEJ
    • Mouse Jiggler for Zita (called Swinput?) - JENNE
  • Ubuntu vs. CentOS
    • burttoday is not aliased in ubuntu.    burttoday:      aliased to cd /opt/rtcds/caltech/c1/burt/autoburt/today/ - JAMIE
    • Upgrade Rossa, Allegra, make sure they connect to DTT, Dataviewer, AWG. - JAMIE
    • ASS doesn't run on Ubuntu! or CentOS Fix it! - JENNE, JAMIE's help
    • CentOS machines cannot open simulink models properly (get "Bad Link"s everywhere, so you can't do anything useful) - JAMIE
  • MM
    • IPPOS beam measurement - SURESH with JENNE
    • AS beam measurement (if beam is bright enough) - SURESH and JENNE
    • Mode matching calculations, sensitivity to MC waist measurement errors, PRM position - JENNE
    • Think up diagnostic measurement to determine mode matching to PRC while chambers are open, while we tweak MMT - JAMIE, JENNE, KOJI, SURESH
    • Use sensoray to capture, measure beam mode at AS, POP - YUTA
  • Stray Light
    • Scattered light measurement at the end stations: design / confirmation of the mechanical parts/optics/cameras - JAN
  • OAF
    • OAF comparison plot, both online and offline, comparing static, adaptive and static+adaptive - DEN
    • Static-only OAF noise budget (Adaptive noise budget as next step) - DEN
    • Build amplifiers for new small microphones - DEN
    • Script for daily / weekly re-calculation of Wiener, post to elog if need changing - DEN
  • Tip Tilts
    • Prepare electronics for TTs (coil drivers) - JAMIE
    • In-air TT testing to confirm we can control / move TTs before we vent - SURESH
    • Connect TTs to digital system and controls, lay cables if needed - JAMIE with SURESH
  • RF Photodiodes
    • Opto Energy diode laser - look into buying - ERICG
    • Purchase fibers, splitters, other supplies - ERICG
    • Set everything up - ERICG

  6637   Thu May 10 14:49:06 2012 KojiHowToGeneralHow to clean & bake black glass pieces

  6648   Thu May 17 15:31:22 2012 steveUpdateGeneralbeam trap posts & clamps for vacuum

 Aluminum posts and SS clamps for green glass traps in vacuum will be out of the shops by June 6, 2012 the latest

 

Attachment 1: 05161201.PDF
05161201.PDF 05161201.PDF
Attachment 2: 05151201.PDF
05151201.PDF
  6653   Mon May 21 19:16:55 2012 KojiUpdateGeneralrossa X config

I rebooted rossa and the X sever has stalled.

  6667   Wed May 23 13:57:11 2012 JenneBureaucracyGeneral40m Meeting Action Items

PRIORITY ITEMS:

Align Ygreen beam - JENNE, YUTA

Arm cavity sweeps, mode scan - JENNE, YUTA

ASS doesn't run on Ubuntu! or CentOS Fix it! - YUTA, JENNE, JAMIE's help

Input matricies, output filters to tune SUS.  check after upgrade. - JENNE

POX11 whitening is not toggling the analog whitening??? - JAMIE, JENNE, KOJI

Decide on plots for 40m Summary page - DEN, STEVE, JENNE, KOJI, JAMIE, YUTA, SURESH, RANA, DUNCAN from Cardiff/AEI

 Look into PMC PZT drift - PZT failing? Real MC length change? - JENNE, KOJI, YUTA

THE FULL LIST:

  • General
    • Revamp control room - more monitors, maybe move TV shelves. - JENNE
    • Audio system for the signals!!!! Even a crappy one! - LEO
  • SUS
    • Input matricies, output filters to tune SUS.  check after upgrade. - JENNE
  • IFO
    • Fix occasional common-mode power transient in the arm transmissions. Probably an alignment thing. Would ISS help? - MIKEJ?
    • Drift of the green incident axis -> Assess the amount of the drift / replace the mount - JENNE, KOJI
    • Calibration of POP22 / AS110 - JENNE
    • PMC/IMC/ARM characterization (loss, finesse, reflectivity, etc) - JENNE
    • Align green beam - JENNE, YUTA
    • Arm cavity sweeps, mode scan - JENNE, YUTA
    • Align AS OSA (others?) - JENNE  
    • Investigate PRMI glitches, instability - JENNE
    • PZT or Picomotor mounts for PSL/ALS beams - WHO??
    • ALS on the both arm simultaneously / common / diff ALS scripts - JENNE
  • CDS
    • Capture OSA signals in CDS (the 'scope TDS1001B has a USB port in the back for connecting to the computer) - WHO??
    • Transmon (arms) for high and low power - WHO??
    • POX11 whitening is not toggling the analog whitening??? - JAMIE, JENNE, KOJI
    • Install guardians to monitor EPICS values - WHO??
  • Electronics
    • Actuator noise level characterization (coil driver response in V/m & coil driver noise level V/rtHz) - WHO??
    • Beat box - KOJI
    • I/Q DFD - WHO??
    • Improvement of POP22/110/AS110 RF circuits. - WHO??
  • MEDM
    • Complete 40m overview screen - everything should be clickable with pseudo 3D icons - JENNE
    • Better suspension screen - copy from sites. - WHO??
    • Script to generate a MEDM tree - WHO??
    • Resurrect MEDM snapshots - WHO??
    • New ! buttons on every screen, include wiki page - WHO??
    • Screen for errors in signal transmission between models - DEN
  • SCRIPT
    • Locking scripts with integrator triggers / disabling when unlocked - JENNE
    • Daily diagnosis of the MC spot positions (there must be something already...) - SURESH?
    • Daily/occasional adjustment of the incident axis on the MC - SURESH?
    • IFO_CONFIGURE scripts still do a burt restore, so step the optics.  Need to remove optic alignment from config .snap files, use reg restore script instead. - JENNE
    • OPLEV/OSEM trending script before the IFO work for diagnosis. Put into 40m summary screen. - JENNE, DUNCAN from Cardiff/AEI
    • Auto-locker for arms - JENNE
    • Auto-locker for PMC, PSL things - DEN
    • Diagnostic script for CDS - mx_stream, other stuff. - WHO??
  • Video
    • If each video screen has a caption, that would be great - WHO??
    • GUI interface of "videoswitch" - MIKEJ
    • Mouse Jiggler for Zita (called Swinput?) - JENNE
  • Ubuntu vs. CentOS
    • burttoday is not aliased in ubuntu.    burttoday:      aliased to cd /opt/rtcds/caltech/c1/burt/autoburt/today/ - JAMIE
    • Upgrade Allegra, make sure connect to DTT, Dataviewer, AWG. - JAMIE
    • ASS doesn't run on Ubuntu! or CentOS Fix it! - JENNE, JAMIE's help
    • CentOS machines cannot open simulink models properly (get "Bad Link"s everywhere, so you can't do anything useful) - JAMIE
  • MM
    • IPPOS beam measurement - SURESH with JENNE
    • AS beam measurement (if beam is bright enough) - SURESH and JENNE
    • Mode matching calculations, sensitivity to MC waist measurement errors, PRM position - JENNE
    • Think up diagnostic measurement to determine mode matching to PRC while chambers are open, while we tweak MMT - JAMIE, JENNE, KOJI, SURESH
    • Use sensoray to capture, measure beam mode at AS, POP - YUTA
  • Stray Light
    • Scattered light measurement at the end stations: design / confirmation of the mechanical parts/optics/cameras - JAN
    • Align AUX laser into dark port - KOJI, YUTA
  • OAF
    • OAF comparison plot, both online and offline, comparing static, adaptive and static+adaptive - DEN
    • Static-only OAF noise budget (Adaptive noise budget as next step) - DEN
    • Script for daily / weekly re-calculation of Wiener, post to elog if need changing - DEN
  • Tip Tilts
    • Prepare electronics for TTs (coil drivers) - JAMIE
    • In-air TT testing to confirm we can control / move TTs before we vent - SURESH
    • Connect TTs to digital system and controls, lay cables if needed - JAMIE with SURESH
  • RF Photodiodes
    • Opto Energy diode laser - purchase - ERICG
    • Purchase fibers, splitters, other supplies - ERICG
    • Set everything up - ERICG

 

  6668   Wed May 23 20:41:37 2012 SureshBureaucracyGeneral40m Meeting Action Items: Tip-tilts : cabling and electronics

Quote:
..........
  • Tip Tilts
    • Prepare electronics for TTs (coil drivers) - JAMIE
    • In-air TT testing to confirm we can control / move TTs before we vent - SURESH
    • Connect TTs to digital system and controls, lay cables if needed - JAMIE with SURESH
  • .....

 

 [Koji, Suresh]

  We tried to locate the sixteen analog output channels we need to control the four tip-tilts (four coils on each).  We have only 8 available channels on the C1SUS machine. 

  So we will have to plug-in a new DAC output card on one of the machines and it would be logical to do that on the C1IOO machine as the active tip-tilts are conceptually part of the IOO sub-system.   We have to procure this card if we do not already have it.  We have to make an interface between this card output and a front panel on the 1X2 rack.  We may have to move some of the sub-racks on the 1X2 rack to accommodate this front panel.

  We checked out the availability of cards (De-whitening, Anti-imaging, SOS coil drivers)  yesterday.  In summary: we have all the cards we need (and some spares too).  As the De-whitening and Anti-imaging cards each have 8 channels, we need only two of each to address the sixteen channels.  And we need four of the SOS coil drivers, one for each tip-tilt.  There are 9 slots available on the C1IOO satellite expansion chassis (1X1 rack), where these eight cards could be accommodated.

  There are two 25 pin feed-thoughs, where the PZT drive signals currently enter the BS chamber.  We will have to route the SOS coil driver outputs to these two feed-throughs. 

   Inside the BS chamber, there are cables which carry the PZT signals from the chamber wall to the the table top, where they are anchored to a post (L- bracket).  We need a 25-pin-to-25-pin cable (~2m length) to go from the post to the tip-tilt (one for each tip-tilt).  And then, of course, we need quadrapus cables (requested from Rich) which fit inside each tip-tilt to go to the BOSEMs.

   I am summarising it all here to give an overview of the work involved.

 

 

  6673   Thu May 24 12:23:00 2012 DenUpdateGeneralconnection error monitor for the website

The main page of connection error monitor can be a scheme of computers and models with connections. If there is an error in connection, the corresponding arrows turns from green to red.

errors_overview.png

 

Each arrow is a line to a more detailed information about the channels.

errors.png

  6675   Thu May 24 14:49:59 2012 KojiSummaryGeneralDaily news idea

Top tab categolies:

  • Summary
  • CDS
    • CDS Status
  • PEM
    • Seismic 24h trend
    • Accoustic 24h trend
    • Weather/Temp/Barometer/etc 24h trend
  • PSL/IOO
    • PSL summary trend / duty ratio
    • IOO summary (MC Health Check/IOO QPD trends / IFO QPD trends / Transmon QPD trends) duty ratio
  • SUS
    • Summary
    • OSEM PSD/trend
    • OPLEV PSD/trend
  • IFO
    • DC Mon
    • RF ports
    • OMC
  • Steve
    • Vacuum
  • Misc.

IFO

  • DC Monitors
    • Incident beam power trend (24h)
    • AS/REFL/POP/TRX/TRY bean power trend (24h)
    • AS/POP RF beam power trend (24h)
  • RF port
    • DARM sensitivity PSD (mean/min/max/reference) for an hour
    • DARM/CARM/PRCL/MICH/SRCL PSD
    • DARM/CARM/PRCL/MICH/SRCL (freq vs Gaussianity)
    • DARM/CARM/PRCL/MICH/SRCL calibration trend
  • OMC
    • TBD

 

  6676   Thu May 24 15:10:43 2012 SureshSummaryGeneralIOO (MC) health check webpage layout

   Here is the suggested layout of the MC health check web page layout. I will update the Omnigraffle file as people comment and suggest changes.  If you want the file let me know.

 

MC_Health_Check.pdf

  6678   Thu May 24 16:39:47 2012 steveUpdateGeneralsteve's webpage example

3 strip charts monitoring on 24 hours time scale: Vac,  PSL-IFO,  SUS and 10 channel video monitoring inside - outside  of 40m lab

Attachment 1: 05241201.PDF
05241201.PDF
  6682   Fri May 25 16:10:53 2012 KojiUpdateGeneralStripTool on Zita restored

ssh -X pianosa

On pianosa

StripTool PSL.strip&
StripTool IOO.strip&
StripTool seismic.strip&

 

  6690   Sat May 26 01:28:58 2012 KojiUpdateGeneralClipping improvement

The beam at the dark port was largely clipped.
The arm transmissions (TRX/TRY) were ~0.6 no matter how you try to align.

The PZT1/2 X was scanned and TRX/TRY are now both ~0.9.
This means that the beam was mostly clipped in or after the mode mathing optics.

FPMI contrast is (2.45-0.02)/(2.45+0.02) = 98%
Not so bad although it does not tell anything about clipping before the IFO.

In the next opportunity, we should try to "pin" the beam axis on the arm mirrors using A2L.

1. I am not sure exactly where the clipping was. It means that a small clipping might still be there.

2. I am afraid that the beam is still clipped in the faraday. The beam can be scanned using the steering on the PSL table.

 

Attachment 1: Untitled.png
Untitled.png
  6720   Wed May 30 22:04:13 2012 JenneBureaucracyGeneral40m Action Items

.....including:

fix Q of Vio2 filter in SUS. - JENNE

Switch power source for beatnote PD's amplifiers from temporary power supplies under PSL table to permanent taking the power from a rack.

  6733   Thu May 31 17:47:25 2012 SureshOmnistructureGeneral40m Wireless Network

Mike Pedraza came by today to install a new wireless network router configured for the 40m lab network.  It has a 'secret' SSID i.e. not meant for public use outside the lab.  You can look up the password and network name on the rack.  Pictures below show the location of the labels.

40m_Wifi.png

  6741   Fri Jun 1 10:00:03 2012 steveOmnistructureGeneral40m Wireless Network

Quote:

Mike Pedraza came by today to install a new wireless network router configured for the 40m lab network.  It has a 'secret' SSID i.e. not meant for public use outside the lab.  You can look up the password and network name on the rack.  Pictures below show the location of the labels.

40m_Wifi.png

 Mike P swapped in a new network router Linksys E1000

  6843   Thu Jun 21 02:57:16 2012 JenneBureaucracyGeneral40m Action Items

PRIORITY ITEMS:

ASS doesn't run on Ubuntu!
Put beatbox back, simultaneous arm ALS
Input matricies, output filters to tune SUS.  check after upgrade.
POX11 whitening is not toggling the analog whitening???
Look into PMC PZT drift - PZT failing? Real MC length change?
Vent planning / organization

THE FULL LIST:

General

     Audio system for the signals!!!! Even a crappy one!

SUS

     Input matricies, output filters to tune SUS.  Check after upgrade.

IFO

     Fix occasional common-mode power transient in the arm transmissions. Probably an alignment thing. Would ISS help?

     Drift of the green incident axis -> Assess the amount of the drift / replace the mount

     Calibration of POP22 / AS110

     PMC/IMC/ARM characterization (loss, finesse, reflectivity, etc)

     Arm cavity sweeps, mode scan

     Align AS OSA (others?)

     Investigate PRMI glitches, instability

     PZT or Picomotor mounts for PSL/ALS beams

     ALS on the both arm simultaneously / common / diff ALS scripts

     Measure green locking (Aux laser to arm) transfer functions, residual spectra

     Measure oplev spectra while locking Xgreen - see if the optics are particularly noisy

     Measure Xarm residual motion using POX while ALS is engaged.

     Fix Vio2 filter modules on SUS 

     Switch power supply for amplifiers of beatnote signal to rack power

     Add temp sensors for end lasers to CDS slow channels

     Put windows / pickoffs on PSL table for (a) green trans camera, (b) GTRY, (c) GTRX

CDS

     Capture OSA signals in CDS (the 'scope TDS1001B has a USB port in the back for connecting to the computer)

     Transmon (arms) for high and low power

     POX11 whitening is not toggling the analog whitening???

     Install guardians to monitor EPICS values

Electronics

     Actuator noise level characterization (coil driver response in V/m & coil driver noise level V/rtHz)

     Improvement of POP22/110/AS110 RF circuits?

MEDM

     Complete 40m overview screen - everything should be clickable with pseudo 3D icons

     Script to generate a MEDM tree

     Resurrect MEDM snapshots

     New ! buttons on every screen, include wiki page

     Add all screens to svn

SCRIPT

     Daily diagnosis of the MC spot positions (there must be something already...)

     Daily/occasional adjustment of the incident axis on the MC

     Panic button on Watchdog screen isn't working on Ubuntu

     OPLEV/OSEM trending script before the IFO work for diagnosis. Put into 40m summary screen.

     Auto-locker for arms

     Auto-locker for PSL things

     Diagnostic script for CDS - mx_stream, other stuff.

     Make sure scripts are all svn-ed

Video

     If each video screen has a caption, that would be great

     GUI interface of "videoswitch"

Ubuntu vs. CentOS

     Upgrade Ottavia to Ubuntu, make sure connect to DTT, Dataviewer, AWG.

MM

     IPPOS beam measurement

     AS beam measurement (if beam is bright enough)

     Mode matching calculations, sensitivity to MC waist measurement errors, PRM position

     Think up diagnostic measurement to determine mode matching to PRC while chambers are open, while we tweak MMT

     Use sensoray to capture, measure beam mode at AS, POP

Stray Light

     Scattered light measurement at the end stations: design / confirmation of the mechanical parts/optics/cameras

     Align AUX laser into dark port

     Assemble in-vac beam dumps - how many do we need?

OAF

     OAF comparison plot, both online and offline, comparing static, adaptive and static+adaptive

     Static-only OAF noise budget (Adaptive noise budget as next step)

     Script for daily / weekly re-calculation of Wiener, post to elog if need changing

Tip Tilts

     Prepare electronics for TTs (coil drivers)

      In-air TT testing to confirm we can control / move TTs before we vent

     Connect TTs to digital system and controls, lay cables if needed

     Determine whether we need to add a new flange to OMC chamber

RF Photodiodes

     Opto Energy diode laser - purchase

     Set everything up

     Demod board for AS110 - so we can also have POP110?

  6860   Sat Jun 23 18:44:15 2012 steveUpdateGeneralpower surge has no effect on the lab

I was notified by CIT Utilities that there was a power surge or short power outage this after noon.

Lab conditions are normal:  c1ioo is down.  The south arm AC was off......I turned it back on.

  6864   Mon Jun 25 08:21:40 2012 steveUpdateGeneralAC power disturbance on Sat

Quote:

I was notified by CIT Utilities that there was a power surge or short power outage this after noon.

Lab conditions are normal:  c1ioo is down.  The south arm AC was off......I turned it back on.

 

             CALIFORNIA INSTITUTE OF TECHNOLOGY

                 FACILITIES MANAGEMENT

                 UTILITY & SERVICE INTERRUPTION

 

**PLEASE POST**

 

Building:         CAMPUS

 

Date:             Saturday, June 23, 2012

 

Time:             3:46 P.M.

 

Interruption:     Electrical Power Disturbance

 

Contact:          Tom Brennan, x-625-395-4984    

 

*The City of Pasadena Water & Power Department had a 34,000-volt line event on Saturday June 23 at 3:46 p.m.  This caused a city wide disturbance on the power grid.  The Campus did not lose electrical power.  However, the disturbance may have affected sensitive electronic equipment.

(If there is a problem with this Interruption, please notify the Service Center X-4717 or the above Contact as soon as possible.

If no response is received we will proceed with the interruption.)

         

                        Jerry Thompson,

                        Interim Director of Campus Operations & Maintenance

 

Attachment 1: powerdisturbed.png
powerdisturbed.png
  6879   Wed Jun 27 11:33:28 2012 MashaUpdateGeneralFirst Week Update

This week I wrote Matlab code, most of which can be found in /users/masha

First, I wrote a simulation seismicFilter.m which filters noisy seismic noise with a desired signal of non-seismic noise. The signals are purely simulated, so I played around with zero-pole-gain generation of transfer functions to obtain them. The function takes the number of taps, the filter type (Wiener or adaptive nlms) as well as an iteration step size and number of iterations, and generates PSD plots of the witness signal, the desired signal, the estimated (filtered) signal, and the error. I'm not sure that I am properly implementing the Wiener part of the code, and I assume the line "[W, R, P] = miso_firlev(TAPS, noisySeismicSignal1, seismicSignal2); " generates W, a filter with TAPS number of weights, but  then "[y, error] = filter(W, 1, noisySeismicSignal1);" generates an error signal of size TAPS rather than N, the size of the original signal. Perhaps I should calculate error using e(t) = d(t + a) - w(t)*x(t), where "a" is the delay.

I have various screenshots in my directory of what seismicFilter.m generates, and I will take a larger screenshot, as well as generate a learning curve (for error vs. number of taps) when I can use Sasha's computer for a bit, since it both has more computing power and a larger screen.

The funciton filterConvergence.m, meanwhile, is similar, except it takes two file names as real data, and uses realDataFilter.m to run the filtering. Currently, I am working with data from C1:IOO-MC_F_DQ-Online  and C1:PEM-SEIS_GUR1_X_IN1_DQ-Online, and I will include screenshots of these once I get on Sasha's computer.

In order to generate the data, meanwhile, I had to modify the python script, and thus wrote mashaImportingData.py for myself. Likewise, plotSignalFromFile.m visualizes this data, both in the time domain and in the frequency domain.

On the side, I wrote an NLMS filter in adaptiveFilterSimulationNLMS.m, and compared is to Matlab's NLMS filter in NLMStest.m (using generated data) and adaptiveFilterSimulation.m using twn input signals. Right now, it's faster on smaller inputs and smaller tap sizes, but then begins to choke and run slower than the Matlab one when these get to big. In order to improve it, I have to develop a better method of generating the initial weights.

As far as machine learning goes, once I find the number of taps for the convergence of both the Wiener filter and the NLMS filter, I will email Denis for further instructions. At some point, however, I should generate learning sets from the seismometers and the MCL (or the DARM), and thus have to find adequate times at which I can take data (probably not from the DARM, however, because it was rarely on).

Thanks for reading!

  6881   Wed Jun 27 14:12:44 2012 EricSummaryGeneralSURF Week 1

I started work familiarizing myself with the ELOG and some of the control systems at the 40m. I spent a fair bit of time gaining some general knowledge of the interferometer, control systems, calibration, null instruments, etc. On Friday, June 22 Yaakov and I spent the afternoon pulling cables for the beatbox that Jamie had finished up. We were able to get the cables from the rack containing the beatbox routed to the control room.

Then I started work on calibrating the beatbox. I set up the function generator to send a sine wave into the beatbox, then sent the signal from the beatbox to the oscilloscope. I compared both the input sine wave and the output from the beatbox at many frequencies, taking peak to peak measurements. I'm working on using the data to calibrate the beatbox now.

  6893   Fri Jun 29 03:21:32 2012 yutaUpdateGeneralprep for the vent - others

1. Turned off high voltage power supplies for PZT1/2 (input PZTs) and OMC stage 1/2. They live in 1Y3 rack and AUX_OMC_NORTH rack.

2. Restored all IFO optics alignment to the position where I aligned this afternoon (for SRM, I didn't aligned it; it restored at the saved value on May 26).

3. Centered all the oplevs. They can be used for a reference for alignment change before and after the vent.

I will leave PSL mechanical shutter and green shutters closed just in case.

Some MEDM screenshots below.
MEDMscreenshotswithCOW_20120629.png

  6896   Fri Jun 29 16:41:41 2012 yutaUpdateGeneralPRM was NOT installed backwards

[Koji, Steve, Jamie, Yuta]

So, PRM was NOT flipped......

We opened the BS chamber and quickly checked the arrow on the PRM pointing HR. It turned out to be correct, the arrow was pointing towards the arm cavity. We opened the ITMX chamber, too, to check PR2 later.
BS chamber and ITMX chamber is now closed with the light door.

But it was a one step forward anyway, because we could prove PRM was innocent.

What to do next:
  We know that the mode-matching of the incident beam and both arms are pretty good. So, dirty modes come from PRC.
  We will check beam clipping, mirrors, suspensions in PRC.
  I expect the chambers to be closed on Monday(July 2) afternoon and start pumping on Tuesday(July 3) morning.

  6900   Sun Jul 1 23:48:15 2012 yutaSummaryGeneralclipping at BS, my plan

[Koji, Yuta]

We aligned PRMI and inspected BS chamber. Last inspection by Jamie and I (see elog #6897) was done when nothing is aligned, so I wanted to see the difference.
Aligning PRMI at low power was difficult for me, because I see no fringe at ASDC PD nor REFLDC PD. I just aligned them by looking at AS/REFL camera. The beam shape at AS looked as bad as when the usual power.

No significant change was found inside the vacuum. We still see clipping at the Faraday, and also, we saw clipping by BS coil holder. Using PZT1, we could make it better, but this might be causing PRC problem -- BS is inside the PRC, too.

We also took some pictures of PR3 and PRM(attached). The arrow pointing HR is correctly pointing inside the PRC. Seeing is believing.

Yuta's plan:
  We might have to avoid clipping at BS (and Faraday) by aligning input optics inside the vacuum. If we are going to align them, I think we should start from centering MC beam spot positions and the whole alignment could take more than a week. I don't want to spend too much time on the alignment. Also, we are going to install tip-tilts on the next big vent, so we have to redo the alignment anyway.
  So, my plan is as follows;

1. Take lots of photos and close the door on Monday(June 2).

2. Pump on Tuesday(June 3).

3. Restart working on ALS. For example, demonstration of FPMI using ALS.

4. We also can do some characterization of PRC, like measuring power recycling gain for PRMI/PRFPMI, mode scan for PRC using AUX laser from AS port, and so on. We need some calculation for clipping tolerance, too.

  Any objections?

Attachment 1: PR3.JPG
PR3.JPG
Attachment 2: PRM.JPG
PRM.JPG
ELOG V3.1.3-