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ID Date Authorup Type Category Subject
  2234   Wed Nov 11 09:48:04 2009 steveUpdateIOOwhere is IOO-RFAMPD_DCMON ?

RFAMPD_DCMON disappered on Nov 5, 2009

Attachment 1: rfampddc.jpg
rfampddc.jpg
  2248   Thu Nov 12 09:43:29 2009 steveUpdatePEMconstruction has started at CES

The concrete  floor cutting has begun next door at CES

Attachment 1: cuttingconcr.jpg
cuttingconcr.jpg
Attachment 2: cutcon1.JPG
cutcon1.JPG
Attachment 3: cutcon2.JPG
cutcon2.JPG
  2272   Mon Nov 16 09:37:41 2009 steveUpdatePEMconstruction is getting noisier

 

ATM1: Seismometers are saturating, suspensions are OK

Atm2 : activity next door,  diesel Backhoe and diesel concrete cutter are running

Atm3: CES exhaust fans output  is pick up by 40M-Annex-North AC unit  intake. The 40m office room has some diesel smell...........see # 2377

Attachment 1: 4hces.png
4hces.png
Attachment 2: P1050734.JPG
P1050734.JPG
Attachment 3: P1050736.JPG
P1050736.JPG
  2297   Thu Nov 19 09:25:19 2009 steveUpdateMOPAwater was added to the laser chiller

I added ~500 cc of distilled water to the laser chiller yesterday.

Attachment 1: htempwtr.png
htempwtr.png
  2298   Thu Nov 19 09:48:54 2009 steveUpdatePEMconstruction effect

8 days plot: Thurdsay, Friday, Sat and Sun without construction

Attachment 1: varseism.png
varseism.png
  2312   Mon Nov 23 10:11:03 2009 steveUpdatePEMlong term temp fluctuation of the 40m lab

Quote:

This first plot shows the RC temperature channels' performance from 40 days ago, before we disabled the MINCO PID controller. Although RCTEMP is supposed to be the out of loop sensor, what we really care about is the cavity length and so I've plotted the SLOW. To get the SLOW on the same scale, I've multiplied the channel by 10 and then adjusted the offset to get it on the same scale.

 The second plot shows a period after that where there is no temperature control of the can at all. Same gain scaling has been applied to SLOW as above, so that instead of the usual 1 GHz/V this plot shows it in 0.1 GHz/V.

The third plot shows it after the new PID was setup.

Summary: Even though the PID loop has more gain, the true limit to the daily fluctuations in the cavity temperature and the laser frequency are due to the in-loop sensors measuring the wrong thing. i.e. the out-of-loop temperature is too different from the in-loop sensor. This can possibly be cured with better foam and better placement of the temperature sensors. Its possible that we're now just limited by the temperature gradients on the can.

 Here is a 7 years plot of  of the 40m temperature variations.

Attachment 1: 7ytemp.jpg
7ytemp.jpg
  2313   Mon Nov 23 11:03:00 2009 steveUpdateSUSjackhammer special well under control

Quote:

I've changed the watchdog rampdown script so it brings the SUS watchdogs to 220, instead of the 150 it previously targeted.  This is to make tripping less likely with the jackhammering going on next door.  I've also turned off all the oplev damping.

 Saturday's special event of braking up the large concrete pieces in CES bay was un event full.

Attachment 1: dig10d.png
dig10d.png
Attachment 2: P1050740.JPG
P1050740.JPG
  2314   Mon Nov 23 16:28:12 2009 steveSummaryCamerasVideo swicher options

Quote:

Steve is summarizing the Video Matrix choices into this Wiki page:

http://lhocds.ligo-wa.caltech.edu:8000/40m/Electronics/VideoMUX

Requirements:

Price: < 5k$

Control: RS-232 and Ethernet

Interface: BNC (Composite Video)

Please check into the page on Monday for a final list of choices and add comments to the wiki page.

 Composite video matrix switchers with 32 BNC in and 32 BNC channels out are listed.

  2370   Wed Dec 9 09:07:32 2009 steveUpdatePEMhigh seismic activity

The construction activity is shaking the tables in the control room.  The compactor- large remote controlled jackhammer is in the bottom of the 16-17 ft deep hole 15 ft east of ITMY in CES bay. The suspensions  are holding OK. PRM, MC1 and MC3 are effected mostly.

Attachment 1: seis24d.png
seis24d.png
Attachment 2: seis4h.png
seis4h.png
Attachment 3: P1050833.JPG
P1050833.JPG
Attachment 4: P1050836.JPG
P1050836.JPG
  2377   Thu Dec 10 08:43:25 2009 steveFrogsEnvironmentdiesel fumes are less

Quote:

 Instead of doing RCG stuff, I went to Millikan to work on data analysis as I couldn't stand the fumes from the construction.  (this morning, 8am) 

 Diesel fumes are pumped away from control room AC intakes  with the help of newly installed  reflector boxes on the CES wall  fans.........see # 2272

Attachment 1: P1050817.JPG
P1050817.JPG
  2388   Thu Dec 10 16:51:35 2009 steveUpdateVACpumpdown will start tomorrow morning

The vacuum system is at 760 torr  All chambers with doors on and their annuloses are pumped down.

PSL output shutter is still closed. We are fully prepared to star slow pump down tomorrow.

The plan is to reach 1 torr ~ in 6 hrs  without a creating a sand storm.

  2394   Fri Dec 11 08:35:04 2009 steveConfigurationVACpumpdown has started

Oplev positions before and after drag wiped arm TMs as of yesterday. Slow-mode pumpdown has started with 3/4 turn opened  RV1 valve at 8am today.

Attachment 1: wiping.jpg
wiping.jpg
  2400   Fri Dec 11 15:21:40 2009 steveConfigurationVACpumpdown#67 is completed

Quote:

Oplev positions before and after drag wiped arm TMs as of yesterday. Slow-mode pumpdown has started with 3/4 turn opened  RV1 valve at 8am today.

 Pump down is completed. Valve configuration is VACUUM NORMAL. CC1 pressure is in the ~8 e-5 torr   PSL output shutter is opened.

Attachment 1: pd7h.jpg
pd7h.jpg
Attachment 2: oplevpd8h.jpg
oplevpd8h.jpg
  2409   Mon Dec 14 11:21:23 2009 steveOmnistructureEnvironmentAnts in the coffee maker

 

 We still had some ants visiting the sink area this morning. These ants seem to be addicted to our our Peet's coffe

Spectracide: Bug Stop insect killer was sprayed. Please wash your eating dishes well ! and keep area clean.

 

  2439   Mon Dec 21 08:16:54 2009 steveMetaphysicsPEMjackhammering next door

At ITMX, on the CES side, 5 Ft  from the wall the jackhammer is on. The susses are holding well.

  2443   Tue Dec 22 10:04:41 2009 steveOmnistructurePEMmiracle in the 40m

We have been waiting for this for 20 some years. Arrowhead water with cooler. AWESOME

THANKS Alan

Attachment 1: h2oo.JPG
h2oo.JPG
  2466   Wed Dec 30 09:57:53 2009 steveUpdatePSLthirsty water chiller

I added 600 cc of Arrowhead Distilled Water to the chiller.

60 days plot shows that about every ~ 10 days I have to add some.

Please check the water level yourself.

Attachment 1: htemp60d.png
htemp60d.png
  2482   Wed Jan 6 16:48:52 2010 steveBureaucracySAFETYcopied NPRO key

We lost our key to the Lightwave 125/6-OPN-PS   The key shop just made one look a like that works.

Attachment 1: nprokey.JPG
nprokey.JPG
  2489   Fri Jan 8 18:20:12 2010 steveMetaphysicsTreasureRob now can concentrate on his thesis

We are celebrating Rob's promotion to thesis poetry.  These pictures were taken on December 9, 2009

Rob has finished all his measurements in the lab and is officially well prepared to graduate.

rob1.JPGrob2.JPG rob3.JPG

 

  2507   Tue Jan 12 09:14:52 2010 steveSummaryGeneralScattering Measurements of 35W Beam Dumps

 

 What was the power level, polarization and beam size at beam trap?

  2511   Tue Jan 12 14:28:01 2010 steveSummaryEnvironmentlab temp of 7 years

Quote:

Quote:

Rana noticed that recently the temperature inside the lab has been a little bit too high. That might be causing some 'unease' to the computers with the result of making them crash more often.

Today I lowered the temperature of the three thermostats that we have inside the lab by one degree:
Y arm thermostat: from 71 to 70 F
X arm thermostat: from 70 to 69 F
Aisle thermostat: from 72 to 71 F.

For the next hours I'll be paying attention to the temperature inside the lab to make sure that it doesn't go out of control and that the environment gets too cold.

 Today the lab is perceptibly cooler.

The temperature around the corner is 73 F.

 

Attachment 1: labtemp7y.png
labtemp7y.png
  2556   Mon Feb 1 18:33:10 2010 steveUpdateMOPAVe half the lazer!

The 2W NPRO from Valera arrived today and I haf hidden it somewere in the 40m lab!

 

Rana was so kind to make this entry for me

Attachment 1: inno2w.JPG
inno2w.JPG
Attachment 2: inno2Wb.JPG
inno2Wb.JPG
  2561   Tue Feb 2 16:10:09 2010 steveUpdatePEMconstruction progress next door

CES construction is progressing. The 40m suspensions are bearing well.

atm1, PEM  vs sus plots of 120 days

atm2, big pool walls are in place, ~10 ft east of south arm

atm3, 10 ft east of ITMY

atm4, ~60 ft east of ITMY

atm5, cold weather effect of N2 evaporator tower

Attachment 1: pem120d.jpg
pem120d.jpg
Attachment 2: 02022010.JPG
02022010.JPG
Attachment 3: 02022010b.JPG
02022010b.JPG
Attachment 4: 02022010c.JPG
02022010c.JPG
Attachment 5: icewall.JPG
icewall.JPG
  2565   Wed Feb 3 07:57:01 2010 steveUpdatePSLPMC transmission is low

The low PMC transmission alarm was on this morning. The PMC alignment needs a touch up.

Attachment 1: pmct40d.jpg
pmct40d.jpg
  2568   Wed Feb 3 11:13:15 2010 steveConfigurationGeneralplaned power outage for Sat. Feb 20

The electrical shop has to connect the new power transformer at CES. This means we will have no AC power for ~8 hrs on Saturday, February 20

Is this date good for us to power down ALL equipment in the lab?

Rana:  Yes

  2573   Fri Feb 5 11:01:49 2010 steveConfigurationVACslow pumpdown valve

I have installed a slow start throttle valve in front of V3  This spring loaded valve will cut down on the flow at high pressures. There will be no more sand storme

and static built-up during pump down.

Attachment 1: slow.JPG
slow.JPG
  2585   Wed Feb 10 16:27:47 2010 steveConfigurationGeneral IFO beam heights

IN VACUUM beam heights are ALL 5.5"  This is measured from the top of the optical table to the center of all TMs, mirrors and other optical components. This beam is ~36" above the floor.

PSL (inside of enclosure) main-output  beam: PMC, MZ, RC and ISS  are at 3" heights. IOO Angle & Position, MC-Trans and RFAM qpds are at 4"

ALL OTHER beam heights at atmosphere and  different ISCT (interferrometer sensing, control optical table)s are at 4"

 

 

  2589   Thu Feb 11 15:53:59 2010 steveConfigurationVACPSL output shutter is closed

Joe and Alex are working on the computers. Our vacuum system is temporary "All off" condition: meaning all valves are closed, so there is no pumping. cc1 = 1.6e-6 Torr

  2592   Thu Feb 11 18:53:57 2010 steveConfigurationVACVAC NORMAL is back

Quote:

Joe and Alex are working on the computers. Our vacuum system is temporary "All off" condition: meaning all valves are closed, so there is no pumping. cc1 = 1.6e-6 Torr

 Designated vacuum control lap top is trouble some to use. Joe finally fixed it and I switched valve configuration back to vacuum normal. Shutter is open

  2612   Thu Feb 18 10:10:43 2010 steveConfigurationGeneral480 V AC power turned off

Only the 40m cranes are running on 480VAC The electricians are rewiring this transformer on the mezzanine so it was shut down.

I tested all three cranes before the 480V power was turned off. The last thing to do with the cranes to wipe them down before use.

It will happen on next Tuesday morning.

  2632   Tue Feb 23 14:56:24 2010 steveUpdateGeneralETMX optical table mass

Our janitor dropped one 48" long  fluorescent tube on the top cover of ETMX-isct. This accident made glasses fly all over the place.

He cleaned up nicely, but please beware of small glass pieces around ETMX chamber.

We did not clean up on the table in order to reserve oplev and green ITMX pointing alignment.

Plot below shows that the alignment was not effected.

 

 

Attachment 1: etmxmass.jpg
etmxmass.jpg
  2633   Tue Feb 23 16:20:44 2010 steveConfigurationVACoutgassing + leak

Quote:

As preparation for the upcoming planned power outage we turned turbos, RGA off and closed valves.

IFO chamber is not pumped now. Small leaks and out gassing will push the pressure up slowly. At 3 mTorr of P1 the PSL output shutter

will be closed by the interlock.

It is OK to use light in the IFO up to this point.

 Our vacuum was not pumped for 4 days. The computers were not up when we started pumping again. The manual reading on P1 was 15 mTorr.

This means that our outgassing plus leakrate is  ~3.8 mTorr /day 

3-5 mTorr / day is normal

Attachment 1: outgleak.jpg
outgleak.jpg
  2644   Fri Feb 26 15:32:13 2010 steveConfigurationVACpreparation for power outage: vacuum all off

There is a planned power outage tomorrow, Saturday from 7am till midnight.

I vented all annulies and switched to ALL OFF configuration. The small region of the RGA is still under vacuum.

The vac-rack: gauges, c1vac1 and UPS turned off.

Attachment 1: ventd3.jpg
ventd3.jpg
  2647   Mon Mar 1 08:49:37 2010 steveBureaucracySAFETYsafety audit

The 40m safety audit will be at Wednesday afternoon, March 3

Please participate getting our lab to inspection grade safety level.

  2648   Mon Mar 1 11:21:50 2010 steveConfigurationVACvacuum contoller is back to normal

Quote:

There is a planned power outage tomorrow, Saturday from 7am till midnight.

I vented all annulies and switched to ALL OFF configuration. The small region of the RGA is still under vacuum.

The vac-rack: gauges, c1vac1 and UPS turned off.

 Vac- rack is powered back up.  UPS first, than all other power switches from top to bottom of the rack, except Maglev

Manually started one by one TP2 and TP3  to accelerate to 50 KRPM

Brought up vac.control screen on lap-top at /cvs/cds/caltech/medm/c0/ve/VacControl_BAK.adl

V5 and VM3 were opened so TP3 can pump on the RGA

V4 was opened so TP2 can pump on the Maglev-TP1. The Maglev power was  turned on and started acceleration.

The vac control screen positions indicators were checked for true position and annulies vent valves were opened.

RGA manual on/off switch was turned at the top of the RGA-head. Ubuntu copmuter was started at cc4 1.1e-6 Torr

The RGA communication was started with:  ssh c0rga from control room

The rga-script was started ./RGAset.py     This script turns on the filament, rs-232 and scan parameters etc

 

Vac -configuration: IFO-P1 at atm, RGA is pumped and running in background mode, all annulos at atm

 

  2658   Fri Mar 5 11:21:18 2010 steveUpdateSUSused OSEMs are magnetic

Quote:

Jenne and Koji

We successfully hung ITMX on the SOS. Side magnet is ~2mm off from the center of the OSEM. ITMX aligned using the QPD. The OSEMs changes the alignment. It looks that something magnetic is inside the OSEM PD or LED.

Reguled ITMY side magnet.

Cleaned up the lab for the safety inspection.

 The brand new OSEM LED and PD can be picked up with a weak magnet. These ferrous metals of LEDs and PDs will be magnetized by sitting in the sus next to the

magnets for years. I hanged optics with new OSEMs and never saw this effect before.

 

 

We have to demagnetize them.

  2663   Tue Mar 9 09:04:20 2010 steveUpdatePEMkeep vacuum chamber closed

They are sandblasting at CES: our particle counts are very high. DO NOT OPEN CHAMBER!

Attachment 1: sandblasting.jpg
sandblasting.jpg
  2667   Thu Mar 11 15:24:51 2010 steveMetaphysicsEnvironmentIFO was well protected

Quote:

There is a planned power outage tomorrow, Saturday from 7am till midnight.

I vented all annulies and switched to ALL OFF configuration. The small region of the RGA is still under vacuum.

The vac-rack: gauges, c1vac1 and UPS turned off.

 It turns out that we perfecly timed the big one

In the process of finding the signal of the big chilean earthquake I just realized that we were all off

  2670   Fri Mar 12 17:08:22 2010 steveConfigurationVACbg-RGAscan at d18

RGA scan of rga-region only at day 18   This is the back ground of the rga with some calibration gas.

Attachment 1: bg-d18_20100312scan.png
bg-d18_20100312scan.png
  2673   Mon Mar 15 09:43:47 2010 steveUpdatePEMmore sandblasting today

Do not open IFO vacuum envelope today! They are sandblasting again at CES

  2674   Mon Mar 15 16:39:36 2010 steveUpdatePEMGuralp2 centered

Quote:

Untitled.png

 

Guralp 2 centered.The mass position offsets are: E-W 0.05V, N-S 0V, Z 0.4V

Guralp 1: E-W -0.1V, N-S -0.25V, Z 0V measured, not adjusted

The GUR2_X channel has an offset. See plot below when seismometers are disconnected. This offset has to be removed.

NOTE: this huddle is on bad-soft ground-lenoleum tile from prehistoric Flintstone age

 

Attachment 1: grlp2ffst.jpg
grlp2ffst.jpg
  2677   Tue Mar 16 09:37:30 2010 steveUpdateSUSeq 4.4 seen by oplevs and osems

The oplev plots clearly show the alignment effect of this eq.

Attachment 1: opleveq4.4.jpg
opleveq4.4.jpg
Attachment 2: eq4.4.jpg
eq4.4.jpg
Attachment 3: opleveq4.4d3.jpg
opleveq4.4d3.jpg
  2678   Thu Mar 18 08:49:51 2010 steveUpdatePEMGuralp2 centered again ?

 

Someone adjusted the Guralp2 mass position last night??

NO

Attachment 1: grlp2xadj.jpg
grlp2xadj.jpg
  2694   Mon Mar 22 11:37:09 2010 steveUpdatePEMjackhammering

There was more jackhammering this morning just about 20 ft north-west of the beamsplitter chamber, outside.

Attachment 1: jackhammering2.jpg
jackhammering2.jpg
  2699   Tue Mar 23 09:37:36 2010 steveUpdateIOOvac envelope has to be sealed as antproof for overnight

Quote:

This is the first touch to the MC mirrors after the earthquake on 16th.

  • I made an aluminum access connector so that we can work on the MC even the door is open. We still can be able to open the aluminum tube. The photos are attached. Steve, could you please look it at a glance whether the seal is enough or not.
  • MC resonances were flashing. Align MC2 and MC3 so that we have many TEM00s.
  • Found c1vmesus2 gone mad. Restarted remotely according to the wiki entry. 
  • Reset the MC coil output matrix to 1. (Previously, balance was adjusted so that A2L was minimized.)
  • Excite MC2 Pitch/Yaw at 8 and 9 Hz, looking at the peaks in the MC-MCL output. Move MC2 Pitch/Yaw so that the peak
    is reduced. (*)
  • MC1/MC3 were aligned so that we get the maximum transmission (or minimum reflection). (**)
  • Repeat (*) and (**)

So far, I have aligned in Yaw such that the yaw peak is minimized.

 This seal is good for daily use- operation only. The IFO has to be sealed  with light metal doors every night so ants and other bugs can not find their way in.

Our janitor Kevin is mopping the hole IFO room floor area with 5%  ant killing solution in water in order to discourage bugs getting close to our openings of the vented chamber.

You may be sensitive to this chemical too.  Do not open chamber till after lunch.

Attachment 1: pc3.JPG
pc3.JPG
Attachment 2: pc4.JPG
pc4.JPG
  2701   Tue Mar 23 10:11:13 2010 steveUpdatePEM small air cond unit failed yesterday

Old control room air condition failed yesterday around noon. It was blowing 80-85F hot air for about 2-3 hours at racks 1Y4-7 and the entry room 103

Attachment 1: 20datm.jpg
20datm.jpg
  2713   Thu Mar 25 09:07:08 2010 steveUpdatePEMGuralp2 x problem is back

Quote:

I went and double-checked and aligned the styrofoam cooler at ~5:00 UTC. It was fine, but we really need a better huddling box. Where's that granite anyway?

Here's the new Huddle Test output. This time I show the X-axis since there's some coherence now below 0.1 Hz.

You'll also notice that the Wiener filter is now beating the FD subtraction. This happened when I increased the # of taps to 8000. Looks like the noise keeps getting lower as I increase the number of taps, but this is really a kind of cheat if you think about it carefully.

 The same thing happening again.  The intermittent offset upstream of the seismometer that never got fixed.

The granite plate and ball bearings are in. I will place seismometers on it.

Attachment 1: grlp2xproblm.jpg
grlp2xproblm.jpg
  2716   Fri Mar 26 10:48:35 2010 steveUpdateSAFETYsafety glasses measured

Safety glasses 1064 nm transmission measured at ~200 mW level. They are all good.

Attachment 1: P1060188.JPG
P1060188.JPG
Attachment 2: P1060199.JPG
P1060199.JPG
  2742   Wed Mar 31 15:31:53 2010 steveUpdatePSLReference Cavity RF PD base upgraded

Quote:

Some more words about the RFAM: I noticed that there was an excess RFAM by unlocking the RC and just looking at the RF out with the 50 Ohm input of the scope. It was ~100 mVp-p! In the end our method to minimize the AM was not so sensible - we aligned the waveplate before the EOM so as to minimize the p-pol light transmitted by the PBS cube just ahead of the AOM. At first, this did not minimize the RFAM. But after I got angry at the bad plastic mounting of the EOM and re-aligned it, the AM seemed to be small with the polarization aligned to the cube. It was too small to measure on the scope and on the spectrum analyzer, the peak was hopping around by ~10-20 dB on a few second timescale. Further reduction would require some kind of active temperature stabilization of the EOM housing (maybe a good SURF project!).

For the EOM mount we (meaning Steve) should replace the lame 2-post system that's in there with one of the mounts of the type that is used in the Mach-Zucker EOMs. I think we have spare in the cabinet next to one of the arms.

After the RFAM monkeying, I aligned the beam to the RC using the standard, 2-mirror, beam-walking approach. You can see from the attached plot that the transmission went up by ~20% ! And the reflection went down by ~30%. I doubt that I have developed any new alignment technique beyond what Yoichi and I already did last time. Most likely there was some beam shape corruption in the EOM, or the RFAM was causing us to lock far off the fringe. Now the reflected beam from the reference cavity is a nice donut shape and we could even make it better by doing some mode matching! This finally solves the eternal mystery of the bad REFL beam (or at least sweeps it under the rug).

At the end, I also fixed the alignment of the RFPD. It should be set so the incident angle of the beam is ~20-40 deg, but it was instead set to be near normal incidence ?! Its also on flimsy plastic legs. Steve, can you please replace this with the new brass ones?

 Teflon feet removed and heavy brass-delrin pd base installed. Ref-cavity reflected light remains to be beautiful doughnut shape on camera.

Attachment 1: brspdbs.JPG
brspdbs.JPG
  2743   Wed Mar 31 16:31:44 2010 steveUpdatePEMGuralp interface box turned off

Quote:

Quote:

I went and double-checked and aligned the styrofoam cooler at ~5:00 UTC. It was fine, but we really need a better huddling box. Where's that granite anyway?

Here's the new Huddle Test output. This time I show the X-axis since there's some coherence now below 0.1 Hz.

You'll also notice that the Wiener filter is now beating the FD subtraction. This happened when I increased the # of taps to 8000. Looks like the noise keeps getting lower as I increase the number of taps, but this is really a kind of cheat if you think about it carefully.

 The same thing happening again.  The intermittent offset upstream of the seismometer that never got fixed.

The granite plate and ball bearings are in. I will place seismometers on it.

 

Attachment 1: grlpntrfcbxoff.jpg
grlpntrfcbxoff.jpg
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