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ID Date Authorup Type Category Subject Text Attachments
  15791   Tue Feb 2 23:29:35 2021 KojiUpdateCDSCDS crash and CDS/IFO recoveryI worked around the racks and the feedthru
flanges this afternoon and evening. This
inevitably crashed c1lsc real-time process.
  
  15794   Wed Feb 3 18:53:31 2021 KojiUpdateCDSCDS crash and CDS/IFO recoveryReally!? I didn't reboot the machines
between "sudo date" and "rtcds
start c1x0*". I tried rtcds. If it didn't
  
  15801   Wed Feb 10 17:18:03 2021 KojiSummaryBHDSatellite Amplifier Output Offset measurementsTesting the satellite amp i.e. 
PD driver
- To test the noise of the PD transimpedance
  
  15810   Tue Feb 16 15:29:01 2021 KojiUpdateBHDSOS assemblyThe curie temp of SmCo seems about x2 (in
K) of the one for NdFeB. i.e. 600K vs 1000K.
So I believe 177degC = 450K is not an issue.
  
  15813   Wed Feb 17 13:59:43 2021 KojiUpdateSUSCoM on 3"->2" Adapter Ring for SOSNote from today's meeting:

1. Can we adjust the thickness of
  
  15815   Thu Feb 18 03:20:09 2021 KojiSummaryElectronicsCurrent Rack MapFor your planning:  rack_plan.pdf 
  15819   Thu Feb 18 20:20:25 2021 KojiUpdateSUSaLIGO Sat Amp characterizationYeah, it's really inconsistent. You
had 35mA LED drive and the current noise
of the noisy channel was 5e-7 A/rtHz at 1Hz.
  
  15820   Thu Feb 18 20:24:48 2021 KojiSummaryElectronicsA bunch of electronics receivedTodd provided us a bunch of electronics.
I went to Downs to pick them up this afternoon
and checked the contents in the box. Basically,
 IMG_0416.jpeg 
  15824   Fri Feb 19 16:06:01 2021 KojiUpdateSUSCoM Range on 3"->2" Adapter Ring for SOSWe want to move the CoM with the adjustment
range so that the residual deviation is adjusted
by the bottom dumbbell. 0.0003" is well
  
  15826   Fri Feb 19 16:55:26 2021 KojiUpdateSUSCoM Range on 3"->2" Adapter Ring for SOSJordan's screenshot actually shows
that the vertical distance (Y) is 0.0000".
We want to have the vertical distance of
  
  15830   Sat Feb 20 16:46:17 2021 KojiSummaryElectronicsA bunch of electronics receivedWe received currently available sets. We
are supposed to receive more coil drivers
and sat amps, etc. But they are not ready
  
  15835   Tue Feb 23 20:55:19 2021 KojiUpdateSUSOSEM testing for SOSsI can't obtain a consistent view between
the existing drawings/photographs and your
pin assignment. Please review the pin assignment
 SOS_OSEM.pdf 
  15836   Tue Feb 23 23:12:37 2021 KojiSummarySUSSUS invacuum wiringThis is my current understanding
of the in-vacuum wiring:
1. Facts
 SOS_OSEM_cabling.pdf 
  15847   Fri Feb 26 20:20:43 2021 KojiUpdateElectronicsProduction version of the HV coil driver tested with KEPCO HV suppliesThis is very disappointing. Even with KEPCO
linear supply with the improved HV driver
circuit, the noise level is significantly
  
  15863   Thu Mar 4 15:48:26 2021 KojiSummaryPEMWatchdog tripped, Optics damped backEQs seen on Summary pages
https://nodus.ligo.caltech.edu:30889/detcharsummary/day/20210304/pem/seismic_blrms/
  
  15864   Thu Mar 4 23:16:08 2021 KojiUpdateLSCREFL55 demod board reworkA new hybrid splitter (DQS-10-100) was
installed. As the amplification of the final
stage is sufficient for the input level of
 D990511-00_REFL55.pdfP_20210304_215602.jpgP_20210304_222400.jpgP_20210304_222412.jpg20210304234400_IMG_0526.jpg 
  15865   Thu Mar 4 23:57:35 2021 KojiSummaryElectronicsInspection of the new custom dsub cablesI made the inspection of the new custom
DSub cables (came from Texas).

The shelled version gives us some
 6x 
  15866   Fri Mar 5 00:53:09 2021 KojiSummaryElectronicsA bunch of electronics receivedReceived additional front/rear panels.
Updated the original entry and Wiki [Link]

 
  
  15869   Fri Mar 5 15:31:23 2021 KojiUpdateLSCREFL55 demod board reworkMissed to note: The IF test was done at
TP7 and TP6 using pomona clips i.e. brefore
the preamp.
  
  15870   Fri Mar 5 15:32:53 2021 KojiSummaryElectronicsA bunch of electronics receivedThe parts will be ordered by Koji
The components for the additional BIO I/F
have been ordered.
  
  15885   Tue Mar 9 12:41:29 2021 KojiSummaryElectronicsInvestigation on the invacuum Dsub cablesI believe the aLIGO style invac dsub cables
and the conventional 40m ones are incompatible.
While the aLIGO spec is that Pin1
 SOS_OSEM_cabling.pdf 
  15888   Tue Mar 9 15:19:03 2021 KojiUpdateSUSOSEM testing for SOSsHow were the statistics of them? i.e. #
of Good OSEMs, # of OK OSEMs, etc...
  
  15889   Tue Mar 9 15:22:56 2021 KojiSummarySUSPRM suspensionI just saw the PRM watchdog tripped
at ~15:20 local (23:20UTC). I restored
the PRM but I saw only the side watchdog
  
  15901   Thu Mar 11 02:10:06 2021 KojiSummaryBHDBHD Platform vertical dimentionsStephen and I discussed the nominal heights
of the BHD platform components.


The beam height from the
 BHD_Platform_Vertical_Dimentions.pdf 
  15907   Fri Mar 12 03:08:23 2021 KojiSummarySUSCoil Rs & Ls for PRM/BS/SRMSummary

Per Gautam's request, I've
checked the coil resistances and inductances.
 P_20210311_224651.jpgP_20210311_225359.jpg 
  15908   Fri Mar 12 03:22:45 2021 KojiUpdateGeneralGaussmeter in the electronics drawerFor magnet strength measurement:
There is a gaussmeter in the flukes'
drawer (2nd from the top). It turns on and
 P_20210311_231104.jpg 
  15909   Fri Mar 12 03:23:37 2021 KojiUpdateBHDDO card (DO-32L-PE) brought from WBI've brought 4 DO-32L-PE cards from
WB for BHD upgrade for Jon.
 P_20210311_232742.jpgP_20210311_232752.jpg 
  15910   Fri Mar 12 03:28:51 2021 KojiUpdateCDScds rebootI want to emphasize the followings:


FB's RTC (real-time
clock/motherboard clock) is synchronized
  
  15923   Tue Mar 16 16:02:33 2021 KojiUpdateLSCREFL11 demod retrofittingI'm going to remove REFL11 demod for
the noise check/circuit improvement.

----
 IMG_0545.jpegIMG_0547.jpegD040179-A.pdfIMG_0548.jpegIMG_0550.jpeg 
  15936   Thu Mar 18 07:02:27 2021 KojiUpdateLSCREFL11 demod retrofittingAttachment 1: Transfer Functions

The original circuit had a gain
of ~20 and the phase delay of ~1deg at 10kHz,
 TFs.pdfPSD.pdf 
  15980   Wed Mar 31 00:40:32 2021 KojiUpdateElectronicsElectronics Packaging for assembly workI've worked on packing the components
for the following chassis
- 5 16bit AI chassis
 P_20210330_233508.jpgP_20210330_233618.jpg 
  15981   Wed Mar 31 03:56:37 2021 KojiSummaryElectronicsA bunch of electronics receivedWe have received 9x 18bit DAC adapter boards
(D1000654)
 P_20210331_013257.jpgP_20210331_014020.jpg 
  15986   Thu Apr 1 18:16:28 2021 KojiUpdateElectronicsElectronics Packaging for assembly workAll small
components are packed in the boxes. They
are ready to ship.

 
  
  15989   Thu Apr 1 23:55:33 2021 KojiSummaryGeneralHEPA AC cord replacementI think
the PSL HEPA (both 2 units) are not running.
The switches were on. And the variac was
  
  16002   Tue Apr 6 21:17:04 2021 KojiSummaryGeneralPSL HEPA investigation- Last week we found both of the PSL HEPA
units were not running.

- I replaced the capacitor of the
 20210406211741_IMG_0554.jpeg20210406211840_IMG_0555.jpeg20210406211850_IMG_0556.jpeg 
  16003   Wed Apr 7 02:50:49 2021 KojiUpdateSUSFlange InspectionsBasically I went around all the chambers
and all the DB25 flanges to check the invac
cable configurations. Also took more time
  
  16008   Thu Apr 8 20:58:17 2021 KojiUpdateCDSADC adapter boards assembly5x 16bit ADC adapter boards (D0902006)
assembled.
 P_20210408_205411_2_1.jpg 
  16038   Thu Apr 15 18:33:39 2021 KojiUpdateCDSMore 16bit ADC adapter boardsWe received 10x 16bit ADC adapter boards
from Todd. S2100687~S2100696

The number of soldered resistors
 P_20210415_183139_1.jpg 
  16039   Fri Apr 16 00:21:52 2021 KojiUpdateGeneralGlue Freezer completely frozenI was looking at the laser head/amp and
somehow decided to open the glue freezer.
And it was stuck. I've managed to open
 P_20210416_000906.jpgP_20210416_000850.jpg 
  16056   Wed Apr 21 00:08:15 2021 KojiUpdatePSLPSL Table (sort of) covered / HEPA "chimney"Shutdown Procedure:
PSL Shutter closed / MC Autolocker
disabled / PSL mechanical shutter closed
 20210420235324_IMG_0560.jpeg20210420235304_IMG_0559.jpeg20210420235243_IMG_0558.jpeg20210420235344_IMG_0562.jpeg 
  16057   Wed Apr 21 01:14:03 2021 KojiUpdatePSLPSL Table (sort of) covered / HEPA "chimney"I also located the (possible) HEPA filters
in the lab. (Attachments 1~3)

Oh! This is NO-NO! We can't
 P_20210421_005056.jpgP_20210421_005114.jpgP_20210421_005302.jpg 
  16065   Wed Apr 21 13:10:12 2021 KojiUpdateGeneralPSL HEPA MaintenanceIt's probably too late to say but there
are/were two boxes. (just for record)

 
  
  16069   Wed Apr 21 19:43:20 2021 KojiUpdatePSLNew HEPA speed controlThe new HEPA speed controllers are attached
at the middle of the HEPA unit (not at the
edge of the unit)... (Attachment
 P_20210421_193637.jpgP_20210421_193627.jpg 
  16070   Thu Apr 22 01:42:38 2021 KojiSummaryElectronicsHV Supply ComparisonNew HV power supply from Company 'M'
has been delivered. So I decided to compare
the noise levels of some HV supplies in the
 HV_Supply_PSD_H.pdfHV_Supply_PSD_K.pdfHV_Supply_PSD_M.pdfHV_Supply_PSD.pdf 
  16083   Fri Apr 23 19:26:58 2021 KojiUpdatePSLHEPA speed loweredI believe that there is an internal setting
for the minimum flow, so the flow is not
linear ("0%" is not zero), but
  
  16099   Thu Apr 29 17:43:16 2021 KojiUpdateCDSRFM The other day I felt hot at the X end.
I wondered if the Xend A/C was off, but the
switch right next to the SP table was ON
  
  16115   Mon May 3 23:28:56 2021 KojiSummaryGeneralWeird gas leakagr kind of noise in 40m control roomI also noticed some sound in the control
room. (didn't open the MP3 yet)

I'm afraid that the hard disk
  
  16131   Tue May 11 17:43:09 2021 KojiUpdateCDSI/O Chassis AssemblyDid you match the local PC time with the
GPS time?
  
  16136   Wed May 12 16:53:59 2021 KojiUpdateSUSMass Properties of SOS Assembly with 3"->2" Optic sleeve, in SI unitsNo, this is the property of the suspension
assembly. The mass says 10kg

Could you do the same for the testmass
  
  16140   Fri May 14 03:29:50 2021 KojiUpdateElectronicsHV Driver noise test with the new HV power supply from MatsusadaI believe I did the identical test with
the one in [40m
ELOG 15786]. The + input of PA95 was
 HV_Driver_PSD.pdf 
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