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New entries since:Wed Dec 31 16:00:00 1969
ID Date Author Typeup Category Subject Text Attachments
  17785   Tue Aug 15 09:56:52 2023 yutaUpdateIOOPMC aligned, c1sus2 crashed[JC, Yuta  Screenshot_2023-08-15_09-52-14_PMC_c1sus2.png 
  17786   Tue Aug 15 17:11:17 2023 KojiUpdateIOOFIXED: PMC issueSummary

The problem in the PMC
Frequency Reference Card (35.5MHz) was fixed.
  17788   Wed Aug 16 12:49:37 2023 DevenUpdateLSCPCA of noise spikes in sensor ASDsBasic Idea

The idea behind this study was
that in several frequency ranges, there are
  17790   Wed Aug 16 17:16:13 2023 KojiUpdateGeneralBHD / Misc Inventory==
BHD Components ==

  17791   Wed Aug 16 18:33:40 2023 yutaUpdateLSCPRMI 1f/3f switching in both carrier/sideband resonant configurations[JC, Yuta]

Transitioning from
  17792   Wed Aug 16 20:34:22 2023 DevenUpdateLSCPRMI OLTFs measured with new input matrixAfter Yuta locked PRMI and measured the
sensing matrix, I changed the input matrix
to the following and measured the MICH and
  17794   Fri Aug 18 14:43:24 2023 MurtazaUpdateGeneralAcoustic Noise Spectrum of various lab spaces. (100Hz-10kHz)dB(A) (A-weighted) scale and
the Noise Criterion (NC) scale are popularly
used in the United States for creating the
  17795   Fri Aug 18 15:40:23 2023 andreiUpdatePEMSeismometer heater and temp sensorsDismantled the seismometer circuit

At Rana's request, Deven and
I have pulled all the wires out of the seismometer
  17796   Fri Aug 18 16:07:38 2023 devenUpdatePEMSeismometer heater and temp sensorsI've turned off the power supply. I've
attached a picture of the rack with the switch
that I flipped circled
  17797   Mon Aug 21 10:56:16 2023 JC UpdateVACVacuum Loss of N2 PressureThere was a loss of N2 pressure over this
weekend. When I came in to check the cylinder
pressures, I was able to hear a hissing sound
  17798   Tue Aug 22 10:29:14 2023 pacoUpdateOptical LeversStorm and earthquake recovery -- ETMY oplev laser dead, ITMY stuck?[JC, paco]

This morning we noted most optics
were tripped, probably as a result of a recent
  17799   Tue Aug 22 10:52:17 2023 MurtazaUpdateGeneralAcoustic Noise SpectrumThis is an update for 17794.

The UMIK 1 + REW combination gave
satisfactory results for creating the acoustic
  17800   Tue Aug 22 11:31:38 2023 pacoUpdateOptical LeversStorm and earthquake recovery -- ITMY restored[JC, Koji-remote, paco]

ITMY stuck --> Shaken remotely and
  17801   Tue Aug 22 13:36:05 2023 Ian MacMillanUpdateSEIAccelerometer calibration[Ian, Torrey Cullen, Sander Vermeulen]

We are trying to calibrate one
of the Wilcoxon accelerometers from the cryo
  17802   Tue Aug 22 15:56:53 2023 KojiUpdateGeneralBHD / Misc InventoryPhotodiode inventory: [OMC
ELOG 615]
  17804   Wed Aug 23 16:11:03 2023 PacoUpdateGeneralExcess noise on YALS BEAT[Paco]

Tuning the
  17805   Wed Aug 23 16:52:52 2023 Paco, Radhika, MurtazaUpdateASSReducing XARM-ASS ErrorsWe're trying to reduce the demodulated
error signals after running the ASS script
for the XARM.
  17806   Wed Aug 23 19:47:53 2023 KojiUpdateCDSDolphin Fencing Investigation / Full CDS crash / nodus reboot / recovered allDolphin

- I made a basic description on
  17807   Thu Aug 24 02:54:19 2023 KojiUpdateBHDOMC Interface Aligner / BHD OFI arrangementOMC Interface Aligner - (It's upside

BHD OFI arrangement
  17808   Thu Aug 24 11:16:44 2023 ranaUpdateGeneralExcess noise on YALS BEATWith such a big temperature change, do
you still get a reasonable beat note frequency?
There's some previous elog of Koji I
  17810   Thu Aug 24 17:08:38 2023 KojiUpdateGeneralExcess noise on YALS BEATPaco took the data which means he already
had the beat note.

There is some chance that the beat
  17811   Fri Aug 25 20:27:33 2023 KojiUpdateBHDOMC Interface AlignerA bit improved the design of OMC Interface

The idea is...The OMC I/F aligner
  17812   Fri Aug 25 22:52:30 2023 KojiUpdateGeneralTaking nodus /home/export backupTook the backup (snapshot) of nodus'
/home/export as of Aug 25, 2023

  17813   Tue Aug 29 01:39:47 2023 KojiUpdateGeneralBHD / Misc Inventory40m BHD OFI Inventory


  17814   Tue Aug 29 02:02:51 2023 KojiUpdateBHDBHD Prep StatusReady / Soon Ready
- BHD OMC Cables ready
- OMC#1 / OMC#4 ready
  17815   Tue Aug 29 18:02:35 2023 RadhikaUpdateDaily ProgressT&R measurement setup for PR2The intented AOI for PR2 is 1.5 degrees.
I averaged the peak measurements from the
Moku:Go spectrum analyzer and from manual
  17816   Wed Aug 30 17:40:31 2023 MurtazaUpdateSUSETMX TestingUpdate to 17809.
The free swing test for ETMX took quite some
time, here's a brief summary of what
  17817   Thu Aug 31 02:05:09 2023 HirokiUpdateLSCMICH noise in various conditions[Yuta, Hiroki]

work was done on Aug. 10th.
  17819   Thu Aug 31 10:15:21 2023 RadhikaUpdate Electronic CARM to ALS CARM handoff[Paco, Radhika]

ALS control of CARM

  17820   Fri Sep 1 18:06:35 2023 Paco, Radhika, MurtazaUpdateASSReducing XARM-ASS Errors[Radhika, Murtaza]


  17821   Sun Sep 3 08:30:56 2023 HirokiUpdateLSCALS noise on Aug. 10th[Yuta, Hiroki]

work was done on Aug. 10th.
  17822   Sun Sep 3 08:37:18 2023 HirokiUpdateGeneralPut away beam chopper*This work was done on
Aug. 11th.
  17823   Sun Sep 3 08:47:43 2023 HirokiUpdateOptical LeversFound a fiber-coupled visible diode laser (iFLEX-1000)[Koji, Hiroki]

work was done on Aug. 11th.
  17825   Tue Sep 5 11:04:33 2023 ranaUpdateASSReducing XARM-ASS ErrorsI recommend usinng the DC offset method
that Koji and I used for measuring the IMC
WFS sensing matrix (not the AC method that
  17828   Wed Sep 6 12:53:11 2023 Paco, Radhika, MurtazaUpdateASSReducing XARM-ASS Errors[Radhika, Murtaza]

To create the sensing matrix, we
tried the DC offset method by giving offsets
  17831   Thu Sep 7 16:25:01 2023 MurtazaUpdateSUSETMX TestingCOIL
  17832   Thu Sep 7 18:42:02 2023 Paco, Radhika, MurtazaUpdateASSReducing XARM-ASS Errors[Radhika, Murtaza]

We recalculated the sensing matrix
for XARM ASS by collecting each sensor's
  17833   Thu Sep 7 21:09:17 2023 PacoUpdate eCARM and eDARM to ALS CARM and ALS DARMTonight
I managed to lock CARM and DARM under ALS
control only
  17834   Fri Sep 8 17:11:53 2023 KojiUpdateCDSFSSSlow restorationI came to the lab to see the recovery work
from the power glitch this morning 8:15AM.
All CDS seems up. The suspensions are somewhat
  17835   Sat Sep 9 16:25:07 2023 RadhikaUpdateASSReducing XARM-ASS Errors[Radhika, Murtaza]

This post summarizes XARM ASS efforts
from Friday 9/8 and Saturday 9/9.
  17836   Mon Sep 11 19:35:27 2023 RadhikaUpdateASSReducing XARM-ASS Errors[Radhika, Murtaza, Paco]

Today we decided to take a closer
look at the demod phases of the T and L error
  17837   Tue Sep 12 18:49:51 2023 KojiUpdateGeneralTransformed 3x 18bit AI chassis into 16bitFor the preparation of the electronics
upgrade, three 18bit DAC AI chassis were
transformed to 16bit version.
  17846   Fri Sep 15 18:50:34 2023 KojiUpdateCDSDolphin Fencing Investigation / Full CDS crash / nodus reboot / recovered allDolphin
Fencing technique

I believe that the dolphin emits
  17865   Thu Sep 21 12:02:25 2023 KojiUpdateGeneralPower Outage Sept 21, 2023 ~9AM[JC, Paco, Koji]

We had a power outage on Sept 21,
2023 at ~9AM. This is the third power outage
  17869   Fri Sep 22 19:05:19 2023 KojiUpdateGeneralPower Outage Sept 21, 2023 ~9AMPumping configuration changed.
Now TP2 is backing TP1 and TP3 is pumping
  17870   Fri Sep 22 19:31:24 2023 KojiUpdateSUSFixed IMC/IFO alignment screensFixed IMC/IFO alignment screens  Screenshot_2023-09-23_02-28-42.pngScreenshot_2023-09-23_02-28-52.png 
  17872   Mon Sep 25 15:32:57 2023 JCUpdateIOOIMC Alignment After C1Sus2 Crash This Morning[Paco, Murtaza, JC]

Fixed C1SUS2 Crash from this morning

  17873   Mon Sep 25 17:01:46 2023 MurtazaUpdate IFO ALIGNED (WITH SOME ISSUES)[JC, Paco, Radhika, Murtaza]

1. WFS Relief
We tried to change the gain to offload
ELOG V3.1.3-