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ID Dateup Author Type Category Subject Text Attachments
  14466   Tue Feb 19 22:52:17 2019 gautamUpdateASSY arm clipping doubtfulIn an earlier
elog, I had claimed that the suspected
clipping of the cavity axis in the Y arm
 overheadComparison.pdfclipping.pdfrearComparison.pdf 
  14467   Wed Feb 20 18:26:05 2019 gautamUpdateIOOIPPOS recommissionedI've suspected that the TTs are drifting
significantly over the course of the last
couple of days, because despite repeated
 IMG_7330.JPGScreenshot_from_2019-02-20_19-43-27.png 
  14468   Wed Feb 20 23:55:51 2019 gautamUpdateALSALS delay line electronicsSummary:

Last year, I worked
on the ALS delay line electronics, thinking
 delayLineDemod.pdf.zip 
  14469   Fri Feb 22 12:19:46 2019 gautamUpdateIOOTT coil driver VmonTo debug the issue of the suspected drifting
TTs further, I temporarily hijacked CH0-CH8
of ADC1 in the c1lsc expansion chassis, and
  
  14470   Mon Feb 25 20:20:07 2019 KojiUpdateSUSDIN 41612 (96pin) shrouds installed to vertex SUS coil driversThe forthcoming Acromag c1susaux is
supposed to use the backplane connectors
of the sus euro card modules.
 P_20190222_175058.jpg 
  14471   Wed Feb 27 21:34:21 2019 gautamUpdateGeneralSuspension diagnosisIn my effort to understand what's going
on with the suspensions, I've kicked
all the suspensions and shutdown the watchdogs
  
  14472   Sat Mar 2 14:19:35 2019 gautamUpdateCDSFSS Slow servo gains not burt-edPSL NPRO PZT voltage showed large low frequency
(hour timescale) excursions on the control
room StripTool trace, leading me to suspect
  
  14473   Sun Mar 3 14:16:31 2019 gautamUpdateIOOMegatron hard-rebootedIMC was not locked for the past several
hours. Turned out MC autolocker was stuck,
and I could not ssh into megatron because
  
  14474   Tue Mar 5 15:56:27 2019 gautamSummaryTip-TIltDiscussion points about TT re-designChub, Koji and I have been talking about
Udit's re-design. Here are a few points
that were raised. Chub/Koji can add to/correct
  
  14475   Thu Mar 7 01:06:38 2019 gautamUpdateALSALS delay line electronicsSummary:

The restoration of the delay-line
electronics is complete. The chassis has
  
  14476   Fri Mar 8 08:40:26 2019 AnjaliConfiguration Frequency stabilization of 1 micron sourceThe schematic of the homodyne configuration
is shown below.

Following are the list of components
 Homodyne_setup.png 
  14477   Tue Mar 12 22:51:25 2019 gautamUpdateALSALS delay line electronicsThis
Hanford alog may be of relevance as we
are using the aLIGO AA chassis for the IR
  
  14478   Wed Mar 13 01:27:30 2019 gautamUpdateALSALS delay line electronicsThis test was done, and I determine the
frequency discriminant to be 
 DFDcal.pdfDFDnoise.pdf 
  14479   Thu Mar 14 23:26:47 2019 AnjaliUpdateALSALS delay line electronicsAttachment #1 shows the schematic of the
test setup. Signal generator (Marconi) was
used to supply the RF input. We observed
 test_setup_ALS_delay_line_electronics.pdf 
  14480   Sun Mar 17 00:42:20 2019 gautamUpdateALSNF1611 cannot be shot-noise limited?Summary:

Per the manual (pg12)
of the NF 1611 photodiode, the "Input
 PDnoise.pdf 
  14481   Sun Mar 17 13:35:39 2019 AnjaliUpdateALSPower splitter characterizationWe characterized the power splitter ( Minicircuit-
ZAPD-2-252-S+). The schematic of the measurement
setup is shown in attachment #1. The network/spectrum/impedance
 Measurement_setup.pdfTotal_loss.pdfAmplitude_unbalance.pdfPhase_unbalance.pdf 
  14482   Sun Mar 17 21:06:17 2019 AnjaliUpdateALSAmplifier characterisationThe goal was to characterise the new amplifier
(AP1053). For a practice, I did the characterisation
of the old amplifier.This test is similar
 Gain_measurement.pdfAmplifier_gain.pdfnoise_measurement.pdfnoise_characterisation.pdf 
  14483   Mon Mar 18 12:27:42 2019 gautamUpdateGeneralIFO status
c1iscaux2
VME crate is damaged -
 IMG_7343.JPGITMXOL.png 
  14484   Mon Mar 18 17:06:12 2019 gautamUpdateOptical LeversITMY HeNe replacedOplev HeNe was replaced this afternoon.
We did some HeNe shuffling:


A new HeNe was being used
 OLRIN.pdfOL_PIT.pdfOL_YAW.pdf 
  14485   Mon Mar 18 18:10:14 2019 KojiSummaryGeneralTask items and priority[Gautam/Chub/Koji] ~ Mini discussion

Maintenance / Upgrade Items

(Priority high to low)
  
  14486   Mon Mar 18 20:22:28 2019 gautamUpdateALSALS stability testI'm running a test to see how stable
the EX green lock is. For this purpose, I've
left the slow temperature tuning servo on
  
  14487   Wed Mar 20 12:31:30 2019 JonUpdateVACDoing vac controls workI'm rebooting the IOLAN server to load
new serial ports. The interlocks might trip
when the pressure gauge readbacks cut out.
  
  14488   Wed Mar 20 19:26:25 2019 JonUpdateVACProtection against AC power lossToday I implemented protection of the vac
system against extended power losses. Previously,
the vac controls system (both old and new)
 IMG_3146.jpg 
  14489   Wed Mar 20 20:07:22 2019 JonUpdateVACDoing vac controls workWork is completed and the vac system is
back in its nominal state.

  
  14490   Thu Mar 21 12:46:22 2019 JonUpdateVACMore vac controls upgradesThe vac controls system is going down for
migration from Python 2.7 to 3.4. Will advise
when it is back up.
  
  14491   Thu Mar 21 17:22:52 2019 JonUpdateVACMore vac controls upgradesI've converted all the vac control
system code to run on Python 3.4, the latest
version available through the Debian
  
  14492   Thu Mar 21 18:09:36 2019 KojiUpdateCDSdb file preparation for acromag c1susauxI have updated the google doc spreadsheet
to indicate the required action for the new
dbfile
 Screen_Shot_2019-03-21_at_18.06.53.png 
  14493   Thu Mar 21 18:36:59 2019 JonOmnistructureUpgradeVacuum Controls Switchover CompletedUpdated vac channel list is attached. There
are several new ADC channels.

 40m_Vacuum_Acromag_Channels_20190321.pdf 
  14494   Thu Mar 21 21:50:31 2019 ranaUpdateVACProtection against AC power lossagreed - we need all pumps on UPS for their
safety and also so that we can spin them
down safely. Can you and Chub please find
  
  14495   Mon Mar 25 10:21:05 2019 JonUpdateUpgradec1susaux upgrade planNow that the Acromag upgrade of c1vac is
complete, the next system to be upgraded
will be c1susaux. We chose c1susaux because
 IMG_3136.jpgIMG_3138.jpgIMG_3137.jpg 
  14496   Tue Mar 26 04:25:13 2019 JohannesUpdateUpgradec1susaux upgrade plan


Quote:


  
  14497   Tue Mar 26 18:35:06 2019 JonUpdateUpgradeModbus IOC is running on c1susaux2Thanks to new
info from Johannes, I was able to finish
setting up the modbus IOC on c1susaux2.
  
  14498   Thu Mar 28 19:40:02 2019 gautamUpdateALSBeatMouth with NF1611s assembledSummary:

The parts I was waiting for arrived.
I finished the beat mouth assembly, and did
 IMG_7381.JPGIMG_7382.JPGrelTF_schem.pdfdarkNoise.pdf 
  14499   Thu Mar 28 23:29:00 2019 KojiUpdateSUSSuspension PD whitening and I/F boards modified for susaux replacementNow
the sus PD whitening bards
are ready to move the 
 IMG_7474.JPGD000210_backplane.pdfScreenshot_from_2019-03-28_23-28-23.png 
  14500   Fri Mar 29 11:43:15 2019 JonUpdateUpgradeFound c1susaux database bugI found the current bias output channels,
C1:SUS-<OPTIC>_<DOF>BiasAdj,
were all pointed at C1:SUS-<OPTIC>_
  
  14501   Fri Mar 29 15:47:58 2019 gautamUpdateAUXAUX laser fiber moved from AS table to PSL table[anjali, gautam]

To facilitate the 1um MZ frequency
stabilization project, I decided that the
  
  14502   Fri Mar 29 21:00:06 2019 gautamUpdateALSBeatMouth with NF1611s installed
Newfocus 15V current limited supply
was taken from bottom NE corner of the ITMY
Oplev table to power the BeatMouth on the
 IMG_7384.JPGIMG_7385.JPG 
  14503   Sun Mar 31 15:05:53 2019 gautamUpdateALSFiber beam-splitters not PMI looked into this a little more today.


Looking at the beat signal
between the PSL and EX beams from the
 IMG_7384.JPG 
  14504   Sun Mar 31 18:39:45 2019 AnjaliUpdateAUXAUX laser fiber moved from AS table to PSL table

Attachment #1 shows the schematic
of the experimental setup for the frequency
noise measurement of 1 um laser source.
 Schematic_of_experimental_setup_for_frequency_stabilisation_of_1_micron_source.png1_micron_setup_for_frequency_noise_measurement.JPG1_micron_setup_for_frequency_noise_measurement_power_levels.png 
  14505   Mon Apr 1 12:01:52 2019 JonUpdateCDS I brought c1susaux back online this morning
for suspension-channel test scripting. It
had been dead for some time. I followed
  
  14506   Mon Apr 1 22:33:00 2019 gautamUpdateCDSITMY freedWhile Anjali is working on the 1um MZ setup,
the pesky ITMY was liberated from the OSEMs.
The "algorithm" :
  
  14507   Tue Apr 2 14:53:57 2019 gautamUpdateCDSc1vac added to burtI deleted references to c1vac1 and c1vac2
(which no longer exist) and added c1vac to
the autoburt request file list at 
  
  14508   Tue Apr 2 15:02:53 2019 JonUpdateCDSITMY freed    
  14509   Tue Apr 2 18:40:01 2019 gautamUpdateVACVac failureWhile glancing at my  vacFail.png 
  14510   Wed Apr 3 09:04:01 2019 gautamUpdateALSNote about new fiber couplersThe new fiber beam splitters we are ordering,
PFC-64-2-50-L-P-7-2-FB-0.3W,
have the slow axis working and fast axis
  
  14511   Wed Apr 3 09:07:46 2019 gautamUpdateVACVac failureOvernight pressure trends don't suggest
anything went awry after the initial interlock
trip. 
 vacFailOvernight.png 
  14512   Wed Apr 3 10:42:36 2019 gautamUpdateVACTP2 forepump replacedBob and Chub concluded that the drypump
that serves as TP2's forepump had failed.
Steve had told me the whereabouts of a spare
  
  14513   Wed Apr 3 12:32:33 2019 KojiUpdateALSNote about new fiber couplersAndrew seems to have an integrated solution
of PBS+HWP in a singe mount. Or, I wonder
if we should use HWP/QWP before the coupler.
  
  14514   Wed Apr 3 16:17:17 2019 JonUpdateVACTP2 forepump replacedI can't explain the mechanical switching
sound Gautam reported. The relay controlling
power to the TP2 forepump is housed in the
 IMG_3180.jpg 
  14515   Wed Apr 3 18:35:54 2019 gautamUpdateVACPSL shutter re-openedPSL shutter was re-opened at 6pm local
time. IMC was locked. As of 10pm, the main
volume pressure is already back down to the
  
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