40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log, Page 25 of 339  Not logged in ELOG logo
ID Date Author Type Category Subject Text Attachments
  15871   Fri Mar 5 16:24:24 2021 gautamUpdateLSCREFL55 demod board re-installed in 1Y2I don't have a good explanation why,
but I too measured similar numbers to what
Koji measured. The overall conversion gain
 REFL55.pdfdemodNoise.pdf 
  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.
  
  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.
  
  15868   Fri Mar 5 15:03:28 2021 gautamSummaryElectronicsA bunch of electronics receivedThe PCBs for the D1002593
BIO I/F (5pcs ea of D1001050
and D1001266)
  
  15867   Fri Mar 5 13:53:57 2021 gautamUpdateLSCREFL55 demod board rework0 dBm ~ 0.63 Vpp. I guess there is ~4dB
total loss (3dB from splitter
and 1dB from total excess loss above theoretical
  
  15866   Fri Mar 5 00:53:09 2021 KojiSummaryElectronicsA bunch of electronics receivedReceived additional front/rear panels.
Updated the original entry and Wiki [Link]

 
  
  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 
  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 
  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/
  
  15862   Thu Mar 4 11:59:25 2021 Paco, AnchalSummaryLSCWatchdog tripped, Optics damped backGautam came in and noted that the optics
damping watchdogs had been tripped by a >5
magnitude earthquake somewhere off the coast
  
  15861   Thu Mar 4 10:54:12 2021 Paco, AnchalSummaryLSCPOY11 measurement, tried to lock Green Yend laser[Paco, Anchal]

- First ran burtgooey as last time.

- Installed pyepics on base environment
 20210304_POY11_Spectrum_YARMLocked.pdf20210304_POY11_Spectrum_YARMLocked.tar.gz 
  15860   Wed Mar 3 23:23:58 2021 gautamUpdateALSArm cavity scanI see no evidence of anything radically
different from my PSL table optical
characterization in the IMC transmitted
 armScan.pdf 
  15859   Wed Mar 3 22:13:05 2021 gautamUpdateLSCREFL55 demod board reworkAfter this work, I measured that the orthogonality
was poor. I confirmed on the bench that the
PQW-2-90
  
  15857   Wed Mar 3 12:00:58 2021 Paco, AnchalHowToIMCMC_F ASD[Paco, Anchal]

- Saved BURT backup in /users/anchal/BURTsnaps/
- Copied existing code for mode cleaner
 20210303_MC_F_Spectrum.pdf20210303_MC_F_Spectrum.tar.gz 
  15856   Wed Mar 3 11:51:07 2021 YehonathanUpdateSUSOSEM testing for SOSsI finished testing the OSEMs. I put all
the OSEMs back in the box. The OSEMS were
divided into several bags. I put the OSEM
  
  15855   Tue Mar 2 19:52:46 2021 gautamUpdateLSCREFL55 demod board reworkThere were multiple problems with the REFL55
demod board. I fixed them and re-installed
the board. The TFs and noise measured on
  
  15854   Tue Mar 2 13:39:31 2021 ranaUpdateLSCPRM violin filter excessive?agreed, seems excessive. I always prefer
bandstop over notch in case the eigenfrequency
wanders, but the bandstop could be made to
  
  15853   Mon Mar 1 16:27:17 2021 gautamUpdateLSCPRM violin filter excessive?The PRM violin filter seems very suboptimal
- the gain peaking shows up in the MICH OLTF,
presumably due to the MICH-->PRM LSC output
 violins.pdfPRviolin.pdf 
  15852   Mon Mar 1 12:36:38 2021 gautamSummaryIMCgetting familiar with IMC controlsPretty minor thing - but PMCT and PMCR
were switched on Quad 2 for whatever reason.
I switched them back because I prefer the
  
  15851   Mon Mar 1 11:40:15 2021 Anchal, PacoSummaryIMCgetting familiar with IMC controls[Paco, Anchal]

tl;dr: Done no harm, no
lasting change.
  
  15850   Sun Feb 28 22:53:22 2021 gautamUpdateLSCmore PRMI checks here: what it is ain't exactly clearI looked into this a bit more and crossed
off some of the points Rana listed. In order
to use REFL 55 as a sensor, I had to fix
 PRMI_SBres_REFL55.pngPRMI1f_noArmssensMat.pdfPRMI1f_noArmssensMat.pdfPRMI_locked.pngactTFs.pdf 
  15849   Sun Feb 28 16:59:39 2021 rana, gautamUpdateLSCmore PRMI checks here: what it is ain't exactly clearOn Friday evening we checked out
a few more things, somewhat overlapping with
previous tests. All tests done with PRMI
 RAMestimate.png 
  15848   Sat Feb 27 17:25:42 2021 gautamUpdateElectronicsProduction version of the HV coil driver tested with KEPCO HV suppliesI will try the test of switching out KEPCOs
one at a time for the HP. Given that the
passive RC filter doesn't filter
  
  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
  
  15846   Fri Feb 26 16:31:02 2021 gautamUpdateElectronicsProduction version of the HV coil driver tested with KEPCO HV suppliesKoji asked me to test the production version
of the coil driver with the KEPCO HV supplies.
See 
 totalNoise_KEPCO.pdf 
  15845   Thu Feb 25 20:37:49 2021 gautamUpdateGeneralSetting modulation frequency and checking IMC offsetThe Marconi frequency was tuned by looking
at 


The ~3.68 MHz (= 3*f1 -
 modFreq.pdfIMC_offset.pdf 
  15844   Thu Feb 25 16:50:53 2021 gautamUpdateGeneralPRMI sensing matrixAfter all the work at the LSC rack over
the last couple of days, I re-locked the
PRMI (ETMs misaligned), and measured the
 PRMI1f_noArmssensMat.pdf 
  15843   Thu Feb 25 14:30:05 2021 gautamUpdateCDSnew c1bhd setup - diskless bootI've set up one 2U server unit received
from KT in the control room area (the fans
in it are pretty loud but other than
  
  15842   Wed Feb 24 22:13:47 2021 JonUpdateCDSPlanning document for front-end testingI've started writing up a rough testing
sequence for getting the three new front-ends
operational (c1bhd, c1sus2, c1ioo). Since
  
  15841   Wed Feb 24 12:29:18 2021 gautamUpdateGeneralInput pointing recoveredWhile working at the LSC rack, I lost the
input pointing into the IFO (the TT wiring
situation is apparently very fragile, and
  
  15840   Wed Feb 24 12:11:08 2021 gautamUpdateGeneralDemod char part 3I did the characterization discussed at
the meeting today.


RF signal at 100 Hz offset
 noPreamp.pdfwithPreamp.pdfnoPreamp_whitened.pdfwithPreamp_whitened.pdf 
  15839   Wed Feb 24 11:53:24 2021 gautamUpdateGeneralDemod char part 2I measured the noise of the I/F outputs
of all the LSC demodulators. I made the measurement
in two conditions, one with the RF input
 noises_noPreamp.pdfnoises_withPreamp.pdf 
  15838   Wed Feb 24 10:23:03 2021 YehonathanUpdateSUSOSEM testing for SOSsContinuing with the new rig, I measure
the resistance of the cable leading to the
coil to be 0.08+(0.52-0.08)+(0.48-0.08)=0.9ohm.
 OSEM_078_LED_Spot.JPGOSEM_280_LED_Spot.JPGOSEM_117_LED_Spot.JPG 
  15837   Wed Feb 24 10:09:16 2021 yehonathanUpdateSUSOSEM testing for SOSsYes, my phone camera mirrored the image.
Sorry for the confusion.

I see you already uploaded the
  
  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 
  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 
  15834   Tue Feb 23 00:10:05 2021 gautamUpdateGeneralDemod char part 1I measured the conversion efficiencies
for all the RFPD demod boards except the
POP port ones. An RF source was used to drive
 noPreamp.pdfwithPreamp.pdf 
  15833   Mon Feb 22 14:53:47 2021 gautamUpdateCDSdtt-ezca-tools installed on rossaThe defaults cds-crtools didn't come
with some of the older ezcautils (like ezcaread,
ezcawrite etc). This is now packaged for
  
  15832   Mon Feb 22 14:06:49 2021 YehonathanUpdateSUSOSEM testing for SOSsContinuing with the OSEM testing. I measure
the resistance of the wires from the RLC
meter to the coil to be ~ 0.9ohm. I will
  
  15831   Sun Feb 21 20:51:21 2021 ranaUpdateGeneralHousekeeping + PRMI charI'm curious to see if the demod phase
for MICH in REFL & AS chamges between
thi simple Mcihelson and PRMI. IF there's
  
  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
  
  15829   Sat Feb 20 16:20:33 2021 gautamUpdateGeneralHousekeeping + PRMI charIn prep to try some of these
debugging steps, I did the following.


ndscope updated from 0.7.9 to
 IPPOSdeat.pdfTTdrift.pdfPOXnPOY.pdfPRMI.pdf 
  15828   Sat Feb 20 10:01:48 2021 gautamSummaryElectronicsA bunch of electronics receivedWill we also be receiving the additional
34 Satellite Amplifier PCBs?
  
  15827   Fri Feb 19 18:22:42 2021 ranaUpdateLSCPRFPMI sensiing matrix woesI would:


look at the free swingin
michelson. Should be able tu null that siggnal
  
  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
  
  15825   Fri Feb 19 16:14:16 2021 gautamUpdateSUSCoM Range on 3"->2" Adapter Ring for SOSI briefly talked with Jordan about this.
This suspension will have OSEMs right? With
400ohm series resistance for the coil drivers,
  
  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
  
  15823   Fri Feb 19 15:17:51 2021 JordanUpdateSUSCoM Range on 3"->2" Adapter Ring for SOSAdjusting the thickness of the cylindrical
hole for the mirror on the 2" optic
sleeve, from .6875" to .61" thick,
 Neutral_Point.pngDumbell_Max_Negative_Travel.pngDumbell_Max_Positive_Travel.png 
  15822   Fri Feb 19 13:38:26 2021 gautamUpdateLSCPRFPMII forgot that I had already done some investigation
into recovering the PRFPMI lock after my
work on the RF source. I don't really
  
  15821   Fri Feb 19 12:21:04 2021 YehonathanUpdateBHDSOS assemblyA summary of things that need to be fabricated/purchased/done:




  
ELOG V3.1.3-