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ID Date Authorup Type Category Subject
  9571   Thu Jan 23 13:23:10 2014 SteveUpdateVAC40m IFO is at atmosphere

Quote:

 

There is BLANK VacControl_BAK.adl screen only. 

I can move a valve by disconnecting it's  solenoid power if it's position is normally open.

I will close V1 and check computer cable connections and move on with manual - hand disconnect ea valve to be moved into the right position for vent. Valve positions will be confirmed by looking manual indicators on valves.

 The 40m vacuum envelope vent is completed with instrument grade air.

Valve configuration: chamber open, RGA is pumped through VM3 by TP3,

  9576   Mon Jan 27 09:08:00 2014 SteveUpdateVAC4 days at atmosphere

 

 

  9580   Tue Jan 28 09:51:47 2014 SteveUpdateIOOlow power pointing

 

PSL output is stable.

  9582   Tue Jan 28 16:26:40 2014 SteveUpdateVAC vacuum computers are back without safety

Quote:

[Steve Koji]

We pushed the reset button of c1vac1 and c1vac2 and the vacuum screen is back.

First, we pushed the reset button of c1vac1 and pushed the one on c1vac2.
This did not bring c1vac2 up. We pushed the reset of c1vac2 again and now everything of the vacuum screen is back.

 1, Reset works

 2, Default values are lost. They actually reversed into open and turn on everything when power recycle c1vac1, c1vac2 or 24V dc power supply. This can vent the IFO in an event of power failure!

      It's may be the time to go back to an isolated, vacuum controller only computer.

 

The present valve configuration at Atm1

a, all annuloses are vented

b, valve cables disconnected at: VC1 and 4 IP gate valves

c, the RGA is off and it is pumped by the Maglev through VM2

d, cryo pump is being roughed with TP3  It's outgassing rate was 25 mTorr / min

e, Roughing hose is disconnected

  9591   Mon Feb 3 10:17:14 2014 SteveUpdatePEMdusty surfaces

Please wet WIPE before opening chamber or optical table ! ! 

 with methanol soaked kimwipes.

The Met One particle counter is located on CES wall, just behind ITMX chamber. 

The numbers are not so bad, but have you ( ...a)  asked the IFO lately?

  9592   Mon Feb 3 15:57:52 2014 SteveUpdateGreen LockingETMX green power

There was 0.2 mW green at the X end.

The doubling oven temp was changed from 37.5 to 36 degrees C

Power at green shutter 3 mW  The alignment was not touched.

  9599   Wed Feb 5 08:14:59 2014 SteveUpdateVAC vacuum computers are back without safety

Quote:

 

 1, Reset works

 2, Default values are lost. They actually reversed into open and turn on everything when power recycle c1vac1, c1vac2 or 24V dc power supply. This can vent the IFO in an event of power failure!

      It's may be the time to go back to an isolated, vacuum controller only computer.

 

The present valve configuration at Atm1

a, all annuloses are vented

b, valve cables disconnected at: VC1 and 4 IP gate valves

c, the RGA is off and it is pumped by the Maglev through VM2

d, cryo pump is being roughed with TP3  It's outgassing rate was 25 mTorr / min

e, Roughing hose is disconnected

 Vacuum checks before pump down:

1, check intermittent contact issue in black relay box

2, reconnect cable to ion pumps and vent them to atm before pump down

3, repeat power shutdown-reboot at atmosphere

  9600   Wed Feb 5 09:28:32 2014 SteveUpdateSUSETMY damping restored

ETMY damping restored.

  9604   Wed Feb 5 19:36:50 2014 SteveUpdateVACpumpdown at 25 Torr

Quote:

[Steve, Manasa]

I checked the alignment one last time. The arms locked, PRM aligned, oplevs centered.

We went ahead and put the heavy doors ON. Steve is pumping down now!

 The ion pumps were vented just before pumpdown and their gate valves were opened.

This is an effort to minimize a possible leak through their gates.

Is there a volunteer who goes home late and would close off the roughing? tonight

  9605   Wed Feb 5 19:53:51 2014 SteveUpdateVACpumpdown stops for the day at 14 Torr

 

 

  9607   Thu Feb 6 11:14:07 2014 SteveUpdateVACpumpdown completed

 Pumpdown completed. IR shutter opened at P1 1 mTorr  The block is still in the beam path.

Remember to protect MCR pd before crack up the PSL power.

The ion pump gate valves were just closed by cc1 triggered interlock

The cry pump was "regenerated" during the vent and it's outgassing rate minimized.

CC3 cold cathode gauge was replaced.

 

Valve configuration for week end:

1, VA6 disconnected to avoid accidental venting the IFO through the annulos

2, VC2 disconnected to insure that the cryo stays closed

3, RGA is not running, It's pressure limit 1e-5 Torr

 

  9615   Mon Feb 10 09:45:53 2014 SteveUpdateVACvacuum normal is reached

 

Quote:

 Pumpdown completed. IR shutter opened at P1 1 mTorr  The block is still in the beam path.

Remember to protect MCR pd before crack up the PSL power.

The ion pump gate valves were just closed by cc1 triggered interlock

The cry pump was "regenerated" during the vent and it's outgassing rate minimized.

CC3 cold cathode gauge was replaced.

 

Valve configuration for week end:

1, VA6 disconnected to avoid accidental venting the IFO through the annulos

2, VC2 disconnected to insure that the cryo stays closed

3, RGA is not running, It's pressure limit 1e-5 Torr

 

 Valve configuration:       Vacuum Normal    is reached in really 4 days if we do not count overnight rest of roughing.

 VA6 and VC2 are reconnected. I'm turning on the RGA next

 

 All 4 ion pumps were vented with air and pumped down to ~ 1e-4 Torr

 Ion pumps gate valve control cables are connected and their pumps are disconnected.

 

 The black relay box was tested repeatedly and it stopped misbehaiving.

We were at atmosphere for 13 days.  Chamber BS, ITMX, ITMY and ETMY were opened.

Al foil "cups" were placed on the back side OSEMs of PRM.

  9622   Tue Feb 11 10:44:15 2014 SteveUpdateVACRGA scan at day 6

 

 

  9623   Tue Feb 11 16:49:36 2014 SteveUpdatePEM floor cleaning

 Keven, Steve

 

The floor was cleaned under the east arm tube with hand held wet towel. We moved staff around and mopped. I did at the bottom of rack  1Y1, 2  and 3. 

Last week we did the south arm tube floor.

Next week we 'd like to clean under rack 1X1,2,3, 4, 5, 6 and 7 

  9628   Wed Feb 12 14:59:36 2014 SteveUpdateSUSclipping removed from PRM oplev

 The input pointing of PRM oplev beam was streered just a touch to remove clipping from it's return. 

The spots  did not move visibly on these two lenses.  The spot diameter on the qpd is  ~1.5 mm,  65 micro W and 3440 counts.  

  9633   Thu Feb 13 16:48:33 2014 SteveUpdateGreen LockingX and Y arm green tuned details

Quote:

Y arm green: Nothing much was disturbed. I touched the steering mirrors and brought GTRY from 0.2 to 0.9.

X arm green: The PDH lock was not very stable mostly because of the low power in green. I changed the oven temperature for the doubler to 36.4 corresponding to maximum green power. GTRX increased from 0.1 to 0.9

Both the X and Y arm green alignment were tuned on the PSL table to their respective beat PDs.

The PSL green shutter was not responding to the medm buttons. I found the PSL green shutter set to 'local' and 'N.O' (these are switches in the shutter controller). I do not see any elog and not sure as to why the controller was even touched in the first place. I set the shutter controls to 'remote' and 'N.C'.

 ETMX green power at shutter 3.6 mW at 36.35 C doubler crystal temp.   [ Innolight IR settings 2.0 A,  40.83 C,  500 mW before Faraday 1/2 plate ] 

 ETMY green power at shutter 0.75 mW  at 35.8 C  doubler crytal temp.  [ NPRO IR settings 1.82A,  231 mW_ display,  DT 21 C, DTEC +1V, LT 40 C, LTEC 0.1V, T +41.041 ]  

  9643   Tue Feb 18 10:10:07 2014 SteveUpdatePEM floor cleaning under racks

Quote:

 Keven, Steve

 

The floor was cleaned under the east arm tube with hand held wet towel. We moved staff around and mopped. I did at the bottom of rack  1Y1, 2  and 3. 

Last week we did the south arm tube floor.

Next week we 'd like to clean under rack 1X1,2,3, 4, 5, 6 and 7 

 Keven, Steve

1Y4, 1X1,2,3,4 & 5 instrument racks floor space were cleaned.

  9644   Tue Feb 18 10:38:55 2014 SteveUpdateVACRGA scan at day 13

 All normal.

 

  9665   Mon Feb 24 17:21:42 2014 SteveUpdateGreen Lockinggreen fiber status today

Quote:

Alex, Gautam and Steve,

Single mode fiber 50m long is layed out into cable tray that is attached to the beam tube of the Y arm.

It goes from ETMY to PSL enclosure. It is protected at both ends with " clear- pvc, slit corrugated loom tubing " 1.5" ID

The fiber is not protected between 1Y1 and 1Y4

 The X -arm fiber is in the high cable tray and it has has  coupler mounts.

 The Y -arm fiber is in the low cable tray and it has no coupler mounts.

 The fibers are only protected at entering and exiting the trays.

 We have only 68 ft spare 1.5"  ID protective plastic tubing.

  9678   Wed Feb 26 10:08:14 2014 SteveUpdateIOOIOO trend

 

 The MC is happy (but only for this tiny snapshot in time and most probably will go dysfunctional again as it has been for several months, as of this writing)

  9689   Tue Mar 4 17:07:27 2014 SteveUpdatePEM floor cleaning under racks

Quote:

Quote:

 Keven, Steve

 

The floor was cleaned under the east arm tube with hand held wet towel. We moved staff around and mopped. I did at the bottom of rack  1Y1, 2  and 3. 

Last week we did the south arm tube floor.

Next week we 'd like to clean under rack 1X1,2,3, 4, 5, 6 and 7 

 Keven, Steve

1Y4, 1X1,2,3,4 & 5 instrument racks floor space were cleaned.

 Keven, Steve

 

1X6, 1X7 and 1X9 instrument racks floor space were cleaned today

  9697   Thu Mar 6 09:47:11 2014 SteveUpdateIOOMC trend of 20 days

Quote:

The IMC has not been behaving well since this morning and totally not happy when Q was finishing his measurements. The WFS servo had large offsets in pitch. Looking back at the trend and using ezcaservo to restore the suspensions did not help.

I realigned the IMC and brought TRANS SUM to ~18000 and MCREFL to < 0.5. The spot positions are not very good; nearly 2 mm off in pitch on MC1 and MC3. But after the alignment of MC, the WFS servo offsets were below +/-20.

The MC has been locked stably with WFS servo ON for the last few hours.

P.S. I did not touch the WFS pointing or reset the WFS offsets.

 

  9703   Fri Mar 7 16:13:03 2014 SteveUpdateVACpumping speed is recovered

Quote:

 

 

 Valve configuration:       Vacuum Normal    is reached in really 4 days if we do not count overnight rest of roughing.

 VA6 and VC2 are reconnected. I'm turning on the RGA next

 

 All 4 ion pumps were vented with air and pumped down to ~ 1e-4 Torr

 Ion pumps gate valve control cables are connected and their pumps are disconnected.

 

 The black relay box was tested repeatedly and it stopped misbehaiving.

We were at atmosphere for 13 days.  Chamber BS, ITMX, ITMY and ETMY were opened.

Al foil "cups" were placed on the back side OSEMs of PRM.

Pd 76 and 77 are compared at 30 days of pumping. We spend 13-14 days at atmosphere  before each.

 Pump down 76 was with leaky ion pump gate valve. The ion pumps are not in use for years so they accumulated some higher pressure  PLUS the valve switching caos at computer reboot most likely

increased the ion pumps pressures to about 10-20 torr

I think one of the ion pump gate valve was not sealing well. This leak was holding back pump down speed at pd76

  9723   Wed Mar 12 08:40:42 2014 SteveUpdateVACRGA scan at day 35

 

 

  9726   Fri Mar 14 09:44:34 2014 SteveUpdateLSCmorning lock
  9729   Mon Mar 17 09:27:05 2014 SteveUpdateSUS4.4M local earthquake

 It looks like that ETMX have  2 sticky magnets.

 

  9737   Tue Mar 18 08:31:37 2014 SteveUpdateSUS4.4M local earthquake & its miracle

Quote:

It was little bit surprising to me but Rana's professorial rock'n roll excitation released its sticking on the unconfirmed thing by unconfirmed reason.

I aligned the Xarm manually and via ASS.

Now we are back in the normal state.

 This recovery proceeder deserves a pattern

Note: IR shield glass position variations,  Atm4

  9738   Tue Mar 18 18:05:57 2014 SteveUpdateSUSETMX osem UR

 

  UR osem IR shield glass is pushed back. It came out of its clip holder. The magnet is free.

  Atm2,  UL & LL magnets  centered poorly. Almost hinging on opposite sides.

              UR & LR centered well.  There have plenty of room to move in an earth quake.

  9741   Thu Mar 20 11:16:16 2014 SteveUpdateGeneralnew projector

 

[ Manasa, Ericq and Steve ]

 Vivitek D952HD with 186 hours installed.

  9745   Mon Mar 24 10:41:46 2014 SteveUpdateVACRGA scan at day 50

 

 

  9763   Mon Mar 31 08:11:00 2014 SteveUpdateSUSrecovery from earthquakes

Quote:

* EQ Southeast of LA around 45 minutes ago. Callum and I felt it.

* Koji and I came in to recover. MC suspensions had been mis-aligned. ETMs both tripped their watchdogs.

* As before, the ETMX was stuck in its cage and the UR & LR OSEMs were reading zero V.

* We moved the MC sus back to their OSEM values from 2 hours ago. Koji aligned everything else by just using his chee.

* To shake the ETMX loose, I tried a different tactic than the "Great Balls of Fire". I started giving it 20k steps through the ASCYAW filterbank (with ramping OFF). I used the green light in the X arm video to look at the swinging. Using this as a readback I pumped the OFFSET button on ASCYAW to resonantly swing up the yaw motion. I had to turn the watchdog thresh up to 2000 temporarily. After a couple minutes the ETMX was free.

* We then used the bias sliders to steer it back onto the OL center (which Q nicely lined up for us recently) and then X arm locked in green right away.

Fri Mar 28 22:38:04 2014:  We've just ridden through the 5th aftershock. None of the aftershocks have tripped the watchdogs  but they break the IMC lock.

Local earthquake activity is up. Our suspensions are holding well.    ETMX and ETMY sus damping restored.

  9775   Wed Apr 2 09:31:22 2014 SteveUpdatePEMlocal 3.0M earthquake

Quote:

Koji locked the MC, arms, and PRMI, with no troubles, after the M8.2 earthquake off the coast of Chile, that happened about 4 hours ago.

 Atm2, Chilean 8.2M eq arrived to the 40m 16:57 in 10 minutes. Our OSEMs did not see them.  Hanford got it 2 minutes later.

  9776   Wed Apr 2 16:34:15 2014 SteveUpdateVACMaglev controller needs service

Quote:

Quote:

 The date is correct on this monitor.

Last stored RGA scan data Dec 20, 2013

IFO pressure at CC1 5.8e-6 Torr

Valve configuration: Vacuum Normal, confirmable only by manual checking of position indicators and pressure gauge controllers  readouts

 

 The Osaka TG390MCAB maglev turbo pump's controller TC010M has passed the 40,000 hrs of operation. This triggered the " alarm" LED  warning light to come on. 

It is normal maintenance.  Maglev TP-1 is running perfectly.  Osaka will send us a loaner-controller that we can use while they do the std maintenance.

I'm thinking of ~ February to do this.

 We just received the loaner controller that will be swapped in it tomorrow morning.

The vacuum pressure will rise somewhat during this action.

  9782   Thu Apr 3 17:05:52 2014 SteveUpdateVACMaglev controller swapped

Quote:

Quote:

Quote:

 The date is correct on this monitor.

Last stored RGA scan data Dec 20, 2013

IFO pressure at CC1 5.8e-6 Torr

Valve configuration: Vacuum Normal, confirmable only by manual checking of position indicators and pressure gauge controllers  readouts

 

 The Osaka TG390MCAB maglev turbo pump's controller TC010M has passed the 40,000 hrs of operation. This triggered the " alarm" LED  warning light to come on. 

It is normal maintenance.  Maglev TP-1 is running perfectly.  Osaka will send us a loaner-controller that we can use while they do the std maintenance.

I'm thinking of ~ February to do this.

 We just received the loaner controller that will be swapped in it tomorrow morning.

The vacuum pressure will rise somewhat during this action.

 The loaner controller is swapped in. It has  520 Hz rotation speed.  This speed use to be 680 Hz with our old one.

  9795   Thu Apr 10 16:09:29 2014 SteveUpdateVACRGA scan at 75% pumping speed

Quote:

 

 The loaner controller is swapped in. It has  520 Hz rotation speed.  This speed use to be 680 Hz with our old one.

 

  9814   Tue Apr 15 13:24:42 2014 SteveUpdatePSLlaser turned on

The 2W Innolight was off for 4 hours.

  9828   Fri Apr 18 09:40:28 2014 SteveUpdateElectronicsit is a kick

10 days of on-off glitching?   It is a kick. The LSC is off, so it must be the ALS

  9834   Mon Apr 21 10:14:00 2014 SteveUpdateVACMaglev controller serviced

Quote:

 

 The loaner controller is swapped in. It has  520 Hz rotation speed.  This speed use to be 680 Hz with our old one.

 The  Maglev controller was serviced at Osaka Vacuum. It was swapped in this morning.

  9876   Tue Apr 29 16:42:29 2014 SteveUpdateVACTP2 drypump replaced

Quote:

 

 TP2's fore line - dry pump replaced at performance level 600 mTorr after 10,377 hrs of continuous operation.

Where are the foreline pressure gauges? These values are not on the vac.medm screen.

The new tip seal dry pump lowered the small turbo foreline pressure 10x

TP2fl after 2 day of pumping 65mTorr

 TP2 dry pump replaced at fore pump pressure 1 Torr,  TP2 50K_rpm 0.34A

 Top seal life 6,362 hrs

 New seal performance at 1 hr  36 mTorr, 

 Maglev at 560 Hz, cc1 6e-6 Torr

 

  9878   Wed Apr 30 11:16:41 2014 SteveUpdateIOOthis typical morning

c1sus and c1iscey were reset. The PMC needed to be locked. MC locked instantly.

The FSS ion pump power supply was turned on.

 

 

 

 

  9901   Fri May 2 08:38:07 2014 SteveUpdateIOOthis typical morning

 

 c1sus needed reset.

  9946   Tue May 13 13:27:58 2014 SteveSummarySUSOptical Lever Servos setting table

Quote:

For some reason or another, I decided that we should see if the optical lever servos were injecting too much noise into the test masses. The ITMs are much worse than the ETMs and I am afeared that they might be making the main noise for our arms in the 20-40 Hz region. Jenne is checking up on these feedback loops to see what's up.

To estimate the actuator gains of the mirrors, I turned on 1 count drives from LSC/CAL oscillators into the LSC drives of each test mass at the frequencies shown in the plot with the resulting peaks showing up in in POX/Y with the single arm locks in red. I will leave these going permanently, but with 0.1 count ampltiudes; we need to make it so in the scripts.

 I'm in the process of filling this table

OPLEV

SERVO     

300 ^

2:0

BR

16,24

Hz

ELP RLP BOOST RES

GAIN

QPD

COUNTS

 

QPD

mW

QPD

beam

OD

HE/NE

output

mW

%

back

on QPD

                                
ETMY PIT  FM1  FM5    55      -30 8,200 0.2   3.3  
        YAW  FM1  FM5    55      -28          
ETMX PIT  FM1  FM5  35        4.4 900 0.2   1.7  
       YAW  FM1  FM5  35        2.1          
ITMY PIT  FM1  FM5        3.3   52 14,400 0.4   9.5  
      YAW  FM1  FM5        3.3  -46          
ITMX PIT  FM1  FM5  50      3.3   30 7,400 0.17   2.8  
       YAW  FM1  FM5  50      3.3  -20          
BS  PIT  FM1  FM5  35      3.3   9 2,800 0.05   2.8  
    YAW  FM1  FM5  35      3.3  -9          
PRM  PIT FM1  FM5  55   FM7  3.3  7 3200 0.06   2.8  
       YAW FM1  FM5  55   FM7  3.3  -5          
SRM  PIT  FM1            -20       9.5  
       YAW  FM1            20          

 I should replace ETMX He/Ne laser

  9947   Tue May 13 17:03:05 2014 SteveSummarySUSETMX oplev laser replaced

Quote:

Quote:

For some reason or another, I decided that we should see if the optical lever servos were injecting too much noise into the test masses. The ITMs are much worse than the ETMs and I am afeared that they might be making the main noise for our arms in the 20-40 Hz region. Jenne is checking up on these feedback loops to see what's up.

To estimate the actuator gains of the mirrors, I turned on 1 count drives from LSC/CAL oscillators into the LSC drives of each test mass at the frequencies shown in the plot with the resulting peaks showing up in in POX/Y with the single arm locks in red. I will leave these going permanently, but with 0.1 count ampltiudes; we need to make it so in the scripts.

 I'm in the process of filling this table

OPLEV

SERVO     

300 ^

2:0

BR ELP RLP BOOST RES

GAIN

QPD

COUNTS

 

QPD

mW

QPD

beam

OD

HE/NE

output

mW

%

back

on QPD

                                
ETMY PIT  FM1  FM5    55      -30 8,200 0.2   3.3  
        YAW  FM1  FM5    55      -28          
ETMX PIT  FM1  FM5  35        4.4 900 0.2   1.7  
       YAW  FM1  FM5  35       2.1  1,750  0.33    2.8  
ITMY PIT  FM1  FM5        3.3   52 14,400 0.4   9.5  
      YAW  FM1  FM5        3.3  -46          
ITMX PIT  FM1  FM5  50      3.3   30 7,400 0.17   2.8  
       YAW  FM1  FM5  50      3.3  -20          
BS  PIT  FM1  FM5  35      3.3   9 2,800 0.05   2.8  
    YAW  FM1  FM5  35      3.3  -9          
PRM  PIT FM1  FM5  55   FM7  3.3  7 3200 0.06   2.8  
       YAW FM1  FM5  55   FM7  3.3  -5          
SRM  PIT  FM1            -20       9.5  
       YAW  FM1            20          

 I should replace ETMX He/Ne laser

 

  9952   Wed May 14 10:04:06 2014 SteveSummarySUS oplev laser and temperature

 ETMX oplev qpd gain has to be increased.

 

  9958   Thu May 15 15:10:02 2014 SteveUpdatePEMseismic activities

Our only seismometer is at the east end now.

Atm1, Ditch Day morning puzzle. The gardener came after the freshman did leave and cut the grass with the lawn mower.

Atm2, Yesterday afternoon the Aztecs containers moved out.

  9961   Fri May 16 09:46:05 2014 SteveUpdatePSLpointing monitoring

Quote:

 Tonight I noticed that the drop in PMC transmission was ~1V, more than the usual of ~0.5V from the daily drift.

While re-aligning on the table, I noticed that the misalignment was not from either of the steering mirrors; i.e. I has to walk them both to get the alignment back. This implies that the misalignment is generated far upstream. Maybe the the laser itself is moving. We need some updates from Steve's laser misalignment tracker.

I'd like to replace the paper target with IOO -QPD_POS so we can log it.

  9962   Fri May 16 10:48:32 2014 SteveUpdateLSCY arm T- qpd is getting light guard extension tube

The qpd was removed from the east end table and threaded adaptor ring epoxied on it's shell.

This tube will cut down the amount of emergency exit light getting into the qpd.

  9964   Fri May 16 11:22:23 2014 SteveUpdateLSCX Arm ALS Noise coming in and out

Quote:

Den and I spent some time with the interferometer last night with hopes of bringing in the AO path, but were stymied by the (re)occurrence of the anomalously high low frequency motion of the Xarm, as seen by fluctuations of TRX from .9 to .2 while "held" on resonance.

Jenne reported that they weren't seeing it earlier in the evening, and then it started again when I showed up. Holding the arms on IR, we could see a fair amount of excess low frequency noise in the BEATX_FINE_PHASE_OUT_HZ channel, as compared to BEATY, bringing its RMS to 5 times that of the Y arm. From the shape of the excess noise (broad slope from DC to tens of Hz), Rana suspected air currents and/or scattering effects being the culprit.

Den poked around a bit on the PSL table, which didn't really change much. He then went down to the X end table to inspect the table, and while he was there, I noticed the noise go down to being in line with the Yarm. I joined him at the end, and we found the beat phase noise in the frequency region of concern to be hugely sensitive to tapping on the enclosure, air current, etc. There is also a ton of green light everywhere, and multiple spots of green light around the green refl PD.

At that point however, the quiescent noise was acceptable (TRX fluctuations of <.2), so we went back to the control room to try to lock. Unfortunately, after a few attempts, the noise was back. At this point, we went home. The layout of the end table likely needs some attention to try and minimize our susceptibility to excess scatter effects. 

 Turn off the AC and flow bench please.

  9970   Mon May 19 09:19:44 2014 SteveUpdateLSChappy IFO

15 hours

  9973   Tue May 20 09:12:25 2014 SteveSummarySUSETMX oplev qpd board

Quote:

 ETMX oplev qpd gain has to be increased.

 

 Atm3, Oplev sum read 12,000 counts when the qpd was disconnected ?

           Dark qpd was zero and normal He/Ne incident on qpd was 1,730 counts.

ELOG V3.1.3-