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ID Date Authorup Type Category Subject
  5783   Wed Nov 2 10:41:47 2011 steveUpdateGeneral2 spare heliax at the LSC rack

They were traced and labeled. One goes to 1X2 and the other to AS-ISCT. They are Andrew Heliax 1/4" od. made by CommScone,  model number FSJ1-50A

  5826   Mon Nov 7 08:08:24 2011 steveUpdateIOOPMC locked

The PMC acted like it was sleeping. The HV slider was dead. The MC locked instantly as the PMC had transmission.

Attachment 1: pmcHV.png
pmcHV.png
  5827   Mon Nov 7 08:25:15 2011 steveUpdateGeneralno electricity on Nov. 20

The Nov.19 interruption was rescheduled to be on Nov.20,2011

          CALIFORNIA INSTITUTE OF TECHNOLOGY

                 FACILITIES MANAGEMENT

            UTILITY & SERVICE INTERRUPTION

 

**PLEASE POST**

 

 

Building:         CENTRAL ENGINEERING SERVICES, STEELE HOUSE, KECK LAB,

                  LIGO GRAVITATION PHYSICS BLDG, SAFETY STORAGE (BY CES)

 

Date:             Sunday, Nov. 20,2011

 

Time:             10:00 AM TO 11:00 AM

 

Interruption:     ELECTRICITY

 

Contact:          MIKE ANCHONDO X-4999 OR TOM BRENNAN X-4984

 

*THIS INTERRUPTION IS REQUIRED FOR MAINTENANCE OF HIGH VOLTAGE SWITCHGEAR

IN CAMPUS SUB-STATION.

  5831   Mon Nov 7 14:58:17 2011 steveUpdateGeneralChamber illuminator remote switches installed

nullQuote:

I'm looking for an ether net based  power switch for turning lights on and off for the vacuum system from MEDM screen.  This is what I found

Jamie please take a look at it.

 

 

 I installed 4 remote AC power on/off strip at

1Y1   for the Vertex area 4 chamber illuminating lights ( CIL )

1Y3   for HV ps for PZT steering mirrors that should be interlocked with P1 pressure gauge. Power off above 3 mTorr

1Y4   for  ETMY CILs,

1X9   for ETMX CILs

I need one volunteer to help me to make MEDM screen and connect the network to the switches.

  5844   Wed Nov 9 07:57:39 2011 steveUpdateSUSETMX oplev is down and sus damping restored

The ETMX oplev returning beam is well centered on the qpd. We lost this signal 2 days ago. I will check on the qpd.

ETMX sus damping restored.       c1iscex computer is down

Attachment 1: etmxtripped.png
etmxtripped.png
Attachment 2: etmxOpl.png
etmxOpl.png
  5887   Mon Nov 14 15:46:14 2011 steveUpdateVACTP2's forepump changed

The foreline pressure of TP2 was 1.4 Torr this morning. This drypump worked well for ten months.

Recently rebuilt  drypump with new seal was swapped in.

This is how you do it: close  V1,  V4 and turn off TP2. Replace drypump and start up TP2

Set pump speed to 50 K rpm and open V4 to TP1 Note that the Maglev was not turned off  because V4 was closed off only 5-10 minutes.

Open V1 the status is Vac Normal.

TP2 is rotating at  50K rpm, current pick up 0.2A,  the temp is 26C and its foreline pressure 33 mTorr

Attachment 1: drypump.png
drypump.png
  5897   Tue Nov 15 16:16:34 2011 steveUpdatePSLenclosure interlocks are working on all sliding doors

Ben and Sam came over to fix one of  the east side  sliding  door sensor that had to be moved from the inside  to outside on the enclosure.

We turned off the 2w Innolight for 20minutes. The power is back on, the  PMC and MC locked itself immediately.

  5898   Tue Nov 15 16:25:38 2011 steveUpdatePSLIOO angle qpd centered

This moring I centered the IOO Angle QPD. The IOO Pos QPD was not centered. The existing layout does not allow the beam centering of the Pos qpd without misaligning the MC

input. We have to add an aditional steering mirror. I will do that tomorrow morning.

  5907   Wed Nov 16 10:11:20 2011 steveUpdatePSLIOO angle & pos qpd centered

Quote:

This moring I centered the IOO Angle QPD. The IOO Pos QPD was not centered. The existing layout does not allow the beam centering of the Pos qpd without misaligning the MC

input. We have to add an aditional steering mirror. I will do that tomorrow morning.

 I added the steering mirror for Pos  and centered both qpds

Attachment 1: iooqpds.png
iooqpds.png
  5909   Wed Nov 16 10:25:57 2011 steveUpdateSUSPRM damping restored

The  PRM lost damping about a day ago. It was restored.

  5912   Wed Nov 16 14:34:18 2011 steveUpdatePSLIOO beam moves in pitch

C1:IOO-QPD_ANG_VERT beam movement  in 1 degree C temp change in 3 hrs

 

Attachment 1: iooqpds.png
iooqpds.png
  5927   Thu Nov 17 15:19:06 2011 steveUpdateSUSTi spring plunger to hold OSEM is not affortable

Our existing 300 series SS plungers from McMastercar #8476A43 are silver plated as Atm2 shows.

Problems:  1, they become magnetized after years being close to the magnets

                     2, they oxidize by time so it is hard to turn them

                    

I looked around to replace them.

Titanium body, nose and beryllium copper spring. None magnetic for UHV enviorment.

Can be made in 7 weeks at an UNREASONABLE $169.00 ea at quantity of 50

Attachment 1: 20111116111042405.pdf
20111116111042405.pdf
Attachment 2: P1080216.JPG
P1080216.JPG
  5950   Fri Nov 18 16:37:14 2011 steveUpdateVACpreparing for ac power interruption

The vacuum is ready for no AC power for 1 hr on Sunday morning at 10am

 

I did the follwing:

 

Closed V1,  stopped the rotation of TP-1 maglev, waited till it reached 0 Hz_ rpm  and  turned it's controller off.

Closed V4 and stopped TP-2 rotating

Closed all annuloses and VA6

Closed VM1 and opened VM3 This means the RGA is being pumped by TP3. RGA is running in background mode. V5 will close instantly as the AC will be turned off.

VAC STATUS:  IFO envelope and annulosses are not pumped.  P1  pressure will reach 5-6 mTorr by Sunday morning.

                                 The PSL output shutter will be closed by the interlock at 3 mTorr

 

Kiwamu will turn off Piezo Jena PZT power supplies and computers Saturday.

I will be here around 1pm Sunday to star pumping. I will need EPICs MEDM running by than.

Attachment 1: planednopower.png
planednopower.png
  5962   Sun Nov 20 13:51:54 2011 steveUpdateVACvacuum is back up after ac interruption

State condition: Vac Normal,          CC1 ~8e-6 Torr

The IFO pressure peaked at  8.3 mTorr after 2days of not pumping.

Attachment 1: notpumping.png
notpumping.png
  6025   Mon Nov 28 15:43:36 2011 steveUpdateRF SystemEOM temp zoomed

Quote:

Quote:

Here is 5 days of trend of the EOM temp sensor and the heater driver monitor.  Unfortunately, it looks like we're regularly railing the heater.  Not so awesome. 

Can you zoom the temp mon? (V= -0.1 ~ +0.1)
The crystal was too cold and I tried to heat the PSL table by the lighting. But it seemed in vain.

 It is not working

Attachment 1: eomtempmon.png
eomtempmon.png
  6036   Tue Nov 29 15:25:29 2011 steveUpdateRF SystemEOM temp stabilization performance

 It is not obvious what is working.

 

Attachment 1: 2days.png
2days.png
  6058   Thu Dec 1 11:25:10 2011 steveUpdatePEM40m infrastructure holds up well in strong wind condition

 Santa Anna wind speed was locked around 60 kmph last night on campus. The strongest in 30 years.  The lab hold up well. We did not lose  AC power either.

Threes and windows were blown out and  over on campus.

We have 4 sliding glass windows without "heavy-laser proved" inside protection.

We should plan to upgrade ALL  sliding glass windows with metal protection from the inside.The strongest in 30 years.

Attachment 1: santaannawind.png
santaannawind.png
Attachment 2: wind.png
wind.png
  6120   Wed Dec 14 14:40:53 2011 steveUpdateGreen Lockingdelay line bnc cable specs

The existingly used used Pasternack Enterprices RG58 C/U cable lenght ~ 140 ft and the specs are here at Atm1

 

Atm2 The performance grade RG58-P coaxial cable specs.

Attachment 1: rg58cu.jpg
rg58cu.jpg
Attachment 2: RG58-P.pdf
RG58-P.pdf
  6139   Tue Dec 20 15:49:21 2011 steveUpdatePEMoptical table top

3/4 " thick colored acrylic material will be used in this air tight design. Surgical tubing for o-ring. We may have to put an o-ring into the bottom to have it really air tight.

Feedtrouhs: www.roxtec.com

The top drawing is not ready. It will have handle and industrial grade L-handle lock pin to hold cover down. There will be 2  one inch od post in the midle of the table to hold the cover and lock  the ball pin.

I'm waiting for your inputs, so I can send this preliminary design out for quote.

 

Attachment 1: 05150901.PDF
05150901.PDF
  6168   Wed Jan 4 09:06:50 2012 steveUpdateComputerspossible front-end timing issue

Quote:

Quote:

Is there a reason the framebuilder status light is red for all the front ends?

Also, I reenabled PRM watchdog.

Apparently there is a bug in the timing cards having to do with the new year roll-over that is causing front-end problems.  From Rolf:

For systems using the Spectracom IRIG-B cards for timing information, the code did not properly roll over the time for
2012 (still thinks it is 2011 and get reports from DAQ of timing errors (0x4000)). I have made a temporary fix for this
in the controller.c code in branch-2.3, branch-2.4 and release 2.3.1. 

I was going to check to see if the 40m is suffering from this. I'll be over to see if that's the problem.

 The problem is the same as yesterday.

Attachment 1: rtntstat.png
rtntstat.png
  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
  6180   Mon Jan 9 08:47:35 2012 steveUpdateSUSETMX damping restored

ETMX sus damping restored

  6184   Tue Jan 10 09:17:23 2012 steveUpdatePhotosstrawman's visiters
Attachment 1: P1080491.JPG
P1080491.JPG
Attachment 2: P1080492.JPG
P1080492.JPG
  6188   Thu Jan 12 07:44:21 2012 steveUpdateSUSsapphire wire standoff quote


On Tue, Dec 20, 2011 at 11:37 PM, Rana Adhikari wrote:
Steve,

We are thinking of replacing a few metal parts in the suspension with sapphire/ruby. We want to replace the standoff (which is Al) with sapphire and also the top plate where the wire is clamped.

For the top, we should make a cutout for a little plate in the existing crossbar. In the cutout would go a little mounting plate. Then the clamping plate (which is now steel) we would also replace with a Sapphire one.

I don't think it matters whether its sapphire or ruby, just has to be very hard.

Can you please get some quotes on the parts?

rana

Attachment 1: standoff.PDF
standoff.PDF
  6190   Thu Jan 12 10:11:59 2012 steveUpdatePEMoptical table top with 1" wall

Quote:

3/4 " thick colored acrylic material will be used in this air tight design. Surgical tubing for o-ring. We may have to put an o-ring into the bottom to have it really air tight.

Feedtrouhs: www.roxtec.com

The top drawing is not ready. It will have handle and industrial grade L-handle lock pin to hold cover down. There will be 2  one inch od post in the midle of the table to hold the cover and lock  the ball pin.

I'm waiting for your inputs, so I can send this preliminary design out for quote.

 

 The present plan to go with clear cast acrylic plexiglass 1" thick side wall  and  two  clear  1/2 thick top cover.

The inside would be lined with light braun YAG safety window sheets 0.14"  VLT ~25%  OD 4 @ 532nm & OD 5 @ 1064nm

 

Attachment 1: 101122012atc.PDF
101122012atc.PDF
  6210   Wed Jan 18 12:38:44 2012 steveUpdatePEMAcrylic plexiglass transmittance

Acrylite-Gp.pptx

Transparent- clear plexyglass from tree different sources were measured in 1064 and 532 nm light.

Samples: a, clear Acrylic-GP 0F00  from Ridout Plastics in thickness 0.7" ,  made by  Evonic Ind

                   b, clear cast acrylic from Mc Master Carr in thickness 0.94" , likely  made by Reynolds-Cast

                   c, clear cell cast  plexyglass from Delvie's Plastics - Utah in thickness  0.93" , maker not known

PMC reflected beam was used at 92 mW and 6 mm diameter at incident angle 0-25 degrees.

All tree samples agreed on Transmittance of ~90%, Reflectivity ~3-4% and calculated Adsorption ~6-7%

 

Transparent Colored Acrylic orange-amber #2422   from www.eplastics.com in 0.12" thickness gave  T 96%,  R 1% and  Ab-calc ~3% in the beam of 92 mW 1064  nm at 6 mm diameter.

 

Transparent , colored   Light Red #26 thin film filter   policarbonate-polyester   0.002" thick   from Roscolux measured T 81% of 115 mW 1064 nm

 

Now I changed power meter FieldMate to Ophir and the light source to laser pointer 2.2 mW  ~532 nm  with 1-2 mm beam diameter.

Orange - amber #2422  sample, 0.12" thick,  T 1% ,  R 4%  and  Ab-calculated ~95%, estimated visibility  ~50% It does cut out the green at this low power level.

 Light red #26  sample  T 0.5%  at 2.5 mW of 532 nm . The transparent green is not visible.  The softening point of this sandwiched polycarbonate-polyecter filter is 160C. Estimated VLT of this film ~40%

 

SUMMERY:

Clear and colored acrylics'  @ 1064 nm  transmittance 90% or higher  regardless of thickness. Softenig point 115 degrees C

Colored acrylic and colored policarbonate film are adsorbing the low power green and they  transmit the 1064nm beam.

Options to consider: a, acrylic laser safety shield liner of  0.125" thick inside of 1" thick clear acrylic  box, OD +5 @1064 and OD +4 @ 532nm,  amber color VLT 27%,  150$/sqft

                                      b, thin metal liner for 1" wall acrylic box, VLT 0%

                                     

 

Attachment 2: roscogel_red#26_film.pdf
roscogel_red#26_film.pdf
  6223   Wed Jan 25 17:32:03 2012 steveUpdateGreen Lockinggeen pointing into y arm is misaligned

I  placed an other Y2-LW-1-2050-UV-45P/AR steering mirror into the beam path of the green beam launching in order to avoid the ~30 degrees use of the 45 degrees mirror. The job is not finished.

  6226   Thu Jan 26 08:36:38 2012 steveUpdateSAFETYevacuation drill

It started with fire alarm test yesterday at 14:50 All alarms are  functioning VERY loud and their flashers are bright. Evacuation drill followed. We assembled at north west corner of the 40m building and counted 6 heads.

Nobody was left sleeping inside. Bob carried the success report of the drill to PMA office immediately.

  6227   Thu Jan 26 10:17:01 2012 steveUpdateGreen Lockinggeen pointing into y arm is realigned

Quote:

I  placed an other Y2-LW-1-2050-UV-45P/AR steering mirror into the beam path of the green beam launching in order to avoid the ~30 degrees use of the 45 degrees mirror. The job is not finished.

 The alignment is finished after the realization that the 3rd steering mirror had to be adjusted too.

The input power increased from 1.2 to 1.4 mW

Attachment 1: P1080513.JPG
P1080513.JPG
  6232   Fri Jan 27 09:05:41 2012 steveUpdateSUSOSEM locking plunger

Quote:

Our existing 300 series SS plungers from McMastercar #8476A43 are silver plated as Atm2 shows.

Problems:  1, they become magnetized after years being close to the magnets

                     2, they oxidize by time so it is hard to turn them

                    

I looked around to replace them.

Titanium body, nose and beryllium copper spring. None magnetic for UHV enviorment.

Can be made in 7 weeks at an UNREASONABLE $169.00 ea at quantity of 50

 In order to get a better price from Vlier's Tom Chen I changed Ti body back to SS304L-siver plated and music wire spring. The price is still ~$120 ea. at quantity 50

I will talk to Mike G about modifying the  McMaster plunger with a hex nut.

  6236   Mon Jan 30 08:17:06 2012 steveUpdateIOOPMC

Quote:

I have realigned the beam pointing to PMC. The transmitted light increased from 0.74 to 0.83.

The misalignment was mainly in pitch.

 The PMC pointing has changed, so MC is resonating in high order modes.

Attachment 1: sickPMC.png
sickPMC.png
  6237   Mon Jan 30 16:18:51 2012 steveUpdatePEMRoscolux colored film transmittance at 1064 nm

 

 Roscolux filter films  #74 night blue,  0.003" thick  and  #26 light red, 0.002" thick  were measured in the beam path of  ~6 mm diameter,  1W 1064 nm .

T 90%  + - 5% at 0-30 degrees of  incident angles and R ~10 % 

These sandwitched thin films of policarbonate-polyester filters are not available in thicker forms. Rosco is recommending them to be cooled by air if used in high power beam.

These filters did not get warm at all in 1W, so absorption must be very small.

  6239   Tue Jan 31 08:44:10 2012 steveUpdateIOOlaser shuts down

 

 The 2W Innilight shutdown shut when I opened side door for safety scan. This was not a repeatable by opening -closing side doors later on. Turned laser on, locked PMC and MC locked instantly. The MC was not locked this moring and it seemed that the MC2 spot was still some high order mode

like yesterday. MC lock was lost when the janitor bumped something around the MC.

Attachment 1: laseroff.png
laseroff.png
  6241   Tue Jan 31 17:13:49 2012 steveUpdateIOOonly the PSL laser is off

 

The 2W PSL laser is turned off.  The danger laser lights are not illuminated at the entry doors because of malfunctioning electronic circuit!!!

Laser safety glasses are still required!  Other lasers are in operation!

  6242   Wed Feb 1 17:00:57 2012 steveUpdateIOOlaser is back ON

Quote:

 

The 2W PSL laser is turned off.  The danger laser lights are not illuminated at the entry doors because of malfunctioning electronic circuit!!!

Laser safety glasses are still required!  Other lasers are in operation!

 BEN fixed the interlock.  The laser is turned ON. Thanks for all, Rich and Sam who came over to help. Atm1

All emergency shut- off switches, lights and door indicators are working at this moment. More about this tomorrow.

Atm2, PSL enclosure interlock jungle without REAL schematic drawing.....at this point.... We all agreed it is easier to redo the hole thing than find the problem

Atm3, Emergency shut off switches and illuminated signs from  entry doors to AC on-off box  ( Use this switches in emergency ONLY,  otherwise leave alone , even it is labeled obsolete !)

Summery: I still do not really know what was wrong.

 

Attachment 1: P1080525.JPG
P1080525.JPG
Attachment 2: P1080514.JPG
P1080514.JPG
Attachment 3: P1080518.JPG
P1080518.JPG
  6245   Fri Feb 3 14:47:51 2012 steveUpdatePEMlaser interlock drawing

 Rough draft of      updated interlock drawing by Ben is here.

 

  6247   Fri Feb 3 16:13:49 2012 steveUpdatePEMLED lights for chamber illumination

Cold LED lights replaced hot halogen ones. Flat LED MYAL 6S,  model #112560002  24VAC

This is a LATE ENTRY.  They were purchased  in Jan 2010 and installed 6 of them around May 2010

Attachment 1: P1080526.JPG
P1080526.JPG
  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
  6256   Mon Feb 6 11:07:21 2012 steveUpdateSUSOplev QPD Sum Trends are suspicious

Quote:

The attached trend shows a problem with the QPD sums.

Why are ETMX and ITMX so much lower than ETMY and ITMY? Are the laser's dying? Or is it the gain inside the QPD? Or the reflectivity of the coatings?

Steve - please check on Monday the laser powers and the ETM/ITM reflectivity for HeNe lasers. Maybe we have to increase the transimpedance gain in the heads.

ETMX and ETMY have 0.2 mW returning to their QPDs........so the gain must lower at  ETMX

ITMX laser 1103P has only 0.67 mW output and 0.025 mW returning to the QPD.

ITMX and ETMX oplev lanching paths  have lenses without AR coating. This is my fault. I will buy them.

          ETMX   0.2 mW           900 counts

         ITMX     0.025           1300

         SRM      0.04            2600

          BS      0.05            3500

          PRM     0.06            4000

         ETMY     0.2             9000

        ITMY      0.3            14500

Attachment 1: oplevsums.png
oplevsums.png
  6257   Mon Feb 6 17:06:11 2012 steveUpdateSUSoplev transferfunction of PIT: ETMY & ETMX

Kiwamu showed me how to do transferfunction of oplev pitch

Attachment 1: ETMX_PIT.png
ETMX_PIT.png
Attachment 2: ETMY_PIT.png
ETMY_PIT.png
  6259   Tue Feb 7 16:30:46 2012 steveUpdateSUS ALL oplev PIT transfer functions

SUS- BS, ITMX, ITMY, PRM, SRM, ETMX & ETMY_OLPIT transfer funtion with sine wave excitation 0.1 amplitude:

 

Attachment 1: BS_PIT.png
BS_PIT.png
Attachment 2: ITMX_PIT.png
ITMX_PIT.png
Attachment 3: itmy_pit.png
itmy_pit.png
Attachment 4: PRM_PIT.png
PRM_PIT.png
Attachment 5: SRM_PIT.png
SRM_PIT.png
Attachment 6: ETMX_PIT.png
ETMX_PIT.png
Attachment 7: ETMY_PIT2.png
ETMY_PIT2.png
  6260   Wed Feb 8 16:37:02 2012 steveUpdateSUSITMX OSEM LL is sick

I'm driving C1:SUS-ITMX_OLYAW and PIT_EXC with amplitude 0,1-0.3 while taking transfer funtions of oplev.

The transfer functions are normal. However I noticed that the LL osem is not responding to this excitations

Healthy sensor respons should be like Atm3

Attachment 1: ITMXsensorLL.png
ITMXsensorLL.png
Attachment 2: ITMXsensorLLyaw.1.png
ITMXsensorLLyaw.1.png
Attachment 3: ETMX.2amplPIT2.png
ETMX.2amplPIT2.png
  6263   Thu Feb 9 16:46:02 2012 steveUpdateSUS ALL oplev YAW transfer functions

Quote:

SUS- BS, ITMX, ITMY, PRM, SRM, ETMX & ETMY_OLPIT transfer funtion with sine wave excitation 0.1 amplitude:

 

OL_YAW transfer functions are here.

 I had two PHDs helping me to overlap the EXML files in DTT. We failed. This job requires professorial help.

Attachment 1: BS-OLYAW.1ampl.png
BS-OLYAW.1ampl.png
Attachment 2: ITMX-OLYAW.1ampl.png
ITMX-OLYAW.1ampl.png
Attachment 3: ITMY-OLYAW.1ampl.png
ITMY-OLYAW.1ampl.png
Attachment 4: PRM_OLYAW.1.png
PRM_OLYAW.1.png
Attachment 5: SRM_OLYAW.1ampl.png
SRM_OLYAW.1ampl.png
Attachment 6: ETMX-OLYAW.1ampl.png
ETMX-OLYAW.1ampl.png
Attachment 7: ETMY-OLYAW.1ampl.png
ETMY-OLYAW.1ampl.png
  6264   Thu Feb 9 17:11:05 2012 steveUpdateSUSmore OSEM problems

These observations of the OSEMs  were taken while taking transfer functions of oplev YAW at excitation amplitude 0.1

 

 Atm1,  C1:SUS-ETMX_SENSOR_SIDE cross coupling

Atm2,   C1:SUS-ITMX_SENSOR_LL   not excitable

Atm3-4,   BS and PRM  insensitive

 

Good OSEM list: ITMY, ETMY and SRM

 

Attachment 1: ETMXosemEXC0.1ampl.png
ETMXosemEXC0.1ampl.png
Attachment 2: IMTX-YAW0.1.png
IMTX-YAW0.1.png
Attachment 3: BSosemEXC.1ampl.png
BSosemEXC.1ampl.png
Attachment 4: PRMosemEXC.1ampl.png
PRMosemEXC.1ampl.png
  6268   Fri Feb 10 11:01:31 2012 steveUpdateIOOcrazy ground motion

Quote:

I gave up tonight's locking activity because the MC can't stay locked.

It seems that somehow the seismic noise became louder from about 1:00 AM.

I walked around the outside of the 40-m building to see what's going on, but no one was jumping or partying.

I am leaving the MC autolocker disabled so that the laser won't be driven crazy and the WFS won't kick the MC suspensions.

 

The attachment is a 3-hour trend of the seismometer outputs and the MC trans.

MCunlock.png

 Something has started shaking last night.  Everybody is claiming to be innocent next door.

I turned off the 40m AC at 11:06

Attachment 1: seism1davg.png
seism1davg.png
  6269   Fri Feb 10 11:46:44 2012 steveUpdateIOOseismic noise back to normal

The shaking has stopped at 9:32am  The AC was turned back on at 11:30am  We still do not have any explanation

 

Attachment 1: seism4h.png
seism4h.png
Attachment 2: seis60s.png
seis60s.png
Attachment 3: oneday.png
oneday.png
  6270   Fri Feb 10 15:46:59 2012 steveUpdateSUSruby wire standoff

Finally I found a company who can do Koji's improved  -hard to make-  specification on ruby or sapphire wire standoff.

NOT POLISHED excimer laser cut, wire groove radius R 0.0005" + - 0.0002"

$250 ea at 50 pieces of order

  6273   Fri Feb 10 15:54:27 2012 steveUpdatePEMAC turned back ON

The air cond was off for 2 hrs.  I just switched it back on at 15:51

  6278   Tue Feb 14 08:22:27 2012 steveUpdateSUSsus damping restored

ITMX, PRM and BS watchdogs are tripped. They were restored.

Stable MC was disabled so I can use MC_REFL 1 W beam to measure green glass .

  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
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