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  40m Log, Page 29 of 339  Not logged in ELOG logo
ID Date Author Type Category Subject Text Attachments
  15660   Thu Nov 5 22:27:34 2020 gautamUpdateGeneralVent activities today[koji, gautam]


Tweaked last steering mirror
before PSL beam is launched into vacuum to
  
  15659   Wed Nov 4 17:14:49 2020 gautamUpdateCDSc1bhd setupI am working on the setup of a CDS FE,
so please do not attempt any remote
login to the IPMI interface of c1bhd
  
  15658   Wed Nov 4 00:10:43 2020 gautamUpdateGeneralVent activities today[koji, gautam]


Glued broken off magnet
- curing overnight with lamp to slightly
 IMG_0184.jpgIMG_0185.jpgIMG_0187.jpgIMG_0207.jpegIMG_0210.jpg 
  15657   Tue Nov 3 09:06:50 2020 gautamUpdateGeneralLab alarm trippedI got a call from Calum ~830am today saying
some facilities people entered the lab, opened
the south entrance door, and tripped the
  
  15656   Mon Nov 2 17:32:05 2020 gautamUpdateGeneralPlan for OMC chamberGood point - looking back, I also see that
I already removed the mirror at the SW corner
of the table in
 IMG_2317.JPG 
  15655   Mon Nov 2 17:13:19 2020 KojiUpdateGeneralPlan for OMC chamberI believe the mirror next to IM1 is for
the green beams to be delivered to the PSL
table. I think we still want to keep it.
  
  15654   Mon Nov 2 16:46:06 2020 gautamUpdateGeneralPlan for OMC chamberTo be a bit more clear about what we are
going to do in the OMC chamber, I marked-up
some photos, see 
 IMG_2318.JPGIMG_2332.JPG 
  15653   Mon Nov 2 12:44:25 2020 gautamUpdateGeneralETMY and OMC chamber heavy doors off[koji, rana, gautam]

This morning, we did the following;


Removed the ETMY chamber
 CB84FD62-C48B-414F-8825-50C9DE0B47CF.jpeg 
  15652   Thu Oct 29 19:30:56 2020 gautamUpdateGeneralVent complete
Jam nuts - checked that none of
the nuts move by hand, which according to
Steve, is sufficient. I recorded photos of
 ventValveStatus.pngvent_Oct2020.jpgventValveStatus_overnight.pnglowPowerIMC_afterVent.png 
  15651   Thu Oct 29 12:43:35 2020 gautamUpdateGeneralVent Prep
Oplev HeNe at ETMY was replaced,
see here
for my earlier discussion on this.


I
 preVentAlignment.pngPRMIcarr_PRMalignment.pngALS_ool.pdflowPowerMC.png 
  15650   Thu Oct 29 09:50:12 2020 anchalSummaryCalibrationPreliminary calibration measurement takenI went to 40m yesterday at around 2:30
pm and Koji showed me how to acquire lock
in different arms and for different lasers.
 PreliminaryCalibrationData.pdf 
  15649   Wed Oct 28 20:42:53 2020 KojiUpdateGeneralVent Prep
Two arms / BS / PRM / SRM were
aligned. (Attachment 1)
IMC
was aligned by WFS and the WFS offsets were
 10x 
  15648   Wed Oct 28 14:07:47 2020 gautamUpdateGeneralISS checkoutOk I was using the PD in the black mount
because Rana recommended it a few weeks ago.

Regarding the M2ISS, I acquired
  
  15647   Wed Oct 28 14:01:03 2020 not gautamUpdateGeneralISS checkoutthat little PD in the black mount was never
very good. The AD829 is not a good opamp
for transimpedance and especially not good
  
  15646   Wed Oct 28 09:35:00 2020 KojiUpdateCDSRFM errorsI'm starting the model restarts from
remote. Then later I'll show up in the
lab to do more hard resets.
 Screen_Shot_2020-10-28_at_10.06.00.png 
  15645   Tue Oct 27 23:47:53 2020 gautamUpdateGeneralISS checkoutI wanted to look into the ISS situation.
Some weeks ago, I found the PD
that was previously used as the in-loop photodiode.
  
  15644   Mon Oct 26 17:26:26 2020 gautamUpdateIOOExcess laser freq noise investigationApart from the questionable wiring on the Acromags,
one other important difference is in the
way the connections were made between the
  
  15643   Mon Oct 26 13:35:58 2020 KojiUpdateIOOExcess laser freq noise investigationIn fact, the problem was the grounding
issue (presumably on the IOO racks).
A temporary differential receiver
 6x 
  15642   Fri Oct 23 19:01:57 2020 KojiSummaryPEMPSL Particle Counter kit removed from the tableThe particle counter on the 40m PSL was
removed. The package was made together with
the OMC lab particle counter (see the packing
 P_20201022_173529.jpgP_20201022_173419.jpg 
  15641   Fri Oct 23 16:41:06 2020 KojiUpdateIOOExcess laser freq noise investigation[Koji, Rana]

We wanted to track down the excess
noise seen in MC_F and other places (see
 plot.pdf 
  15640   Fri Oct 23 09:03:43 2020 anchalUpdateElectronicsHV coil driver packaged into 2U chassisAndrew made a battery-powered 0.7 nVrtHz
input-referred noise pre-amplifier for gain
of 200. That might help you.
  
  15639   Thu Oct 22 22:01:53 2020 gautamUpdateElectronicsHV coil driver packaged into 2U chassisIt's not so easy to directly measure
this I think, because the filtering is rather
aggressive. 
 DACnoiseFilterGain.pdfDACnoiseFilterNoises.pdf 
  15638   Thu Oct 22 13:04:42 2020 ranaUpdateElectronicsHV coil driver packaged into 2U chassiswhat is the noise level before the HV stage?
i.e. how well is the acromag noise being
filtered?
  
  15637   Thu Oct 22 11:48:08 2020 YehonathanUpdateBHDMonte Carlo SimulationsI found this H1 alog  entry
by Izumi confirming that the calibrated channels
CAL-CS_* need the same dewhitening filter.
 8x 
  15636   Thu Oct 22 11:14:47 2020 gautamUpdateElectronicsHV coil driver packaged into 2U chassisI packaged the HV coil driver into a 2U
chassis, hoping for better shielding from
pickup. There
 HVampNoise_driven_chassis.pdfHVampNoise_dispUnits.pdfD1900163_measurementSetup.zip 
  15635   Tue Oct 20 20:12:18 2020 KojiSummaryGeneralDJI OSMO Pocket Camera KitI set up an action cam (DJI OSMO Pocket)
and brought it back to the 40m. The kit is
now placed in the control room cabinet together
 20201020200929_IMG_0173.JPG 
  15634   Mon Oct 19 15:40:02 2020 KojiUpdatePEMAlaska EQ M7.5Alaska M7.5 20:54UTC https://earthquake.usgs.gov/earthquakes/eventpage/us6000c9hg/executive

I looked at the suspensions. The
  
  15633   Mon Oct 19 15:38:42 2020 KojiUpdateElectronicsLoan: A file binder "40m wiring diagram" I'll bring a file binder "40m
wiring diagram" to home at the next
chance.
  
  15632   Fri Oct 16 19:44:41 2020 anchalSummaryGeneralLab Entry NotificationI entered 40m today at around 1:10 pm and
left by 1:50 pm. I entered 104 through the
machine shop entry. I took top view single
  
  15631   Fri Oct 16 09:16:37 2020 YehonathanUpdateBHDMonte Carlo SimulationsPushed another update to MCMC simulation.
This includes:


Added new imbalances: ITM
 8x 
  15630   Thu Oct 15 20:00:23 2020 KojiSummaryGeneralHEPA AC cord replacementThe AC cord from the PSL HEPA variac
to the junction box was replaced.
Now the HEPA is running at 70%
 P_20201015_200732.jpgP_20201015_200752.jpgP_20201015_202615.jpgP_20201015_204234.jpg 
  15629   Thu Oct 15 13:48:58 2020 anchalSummaryGeneralLab Entry NotificationI entered 40m today at around 1:20 pm and
left by 1:45 pm. I entered 104 through the
machine shop entry. I did the following:
  
  15628   Thu Oct 15 10:42:39 2020 gautamUpdateBHDMore investigation into RF44 sensingSummary of discussion between
Koji and gautam on 14 Oct:


Koji questioned the accuracy
 analogZetaLock.pngrelPhaseNoise.pdfsigMagPhase.pdf 
  15627   Wed Oct 14 18:16:27 2020 gautamUpdateGeneralPSL HEPA-->50%Per Koji's suggestion, I turned the
PSL HEPA Variac to 50% just now, so that
the power load through the burnt electrical
  
  15626   Wed Oct 14 17:03:55 2020 anchalSummaryALSALS noise budget update - Added whitening filter for ADCKoji recommended that I can add whitening
filters to suppress ADC noise easily. I added
a filter before ADC in ALS loop with 4 zeros
 ALS_NoiseBudgetUpdate.pdf 
  15625   Wed Oct 14 13:28:04 2020 KojiUpdateCOCITM/ETM spares in DownsThe two ITM spares and two ETM spares are
together stored in the optic storage (B110)
at Downs. c/o Liyuan and GariLynn
 IMG_3073.jpeg 
  15624   Tue Oct 13 21:22:29 2020 gautamUpdateGeneralSpace cleared in 1Y1 for new FEs[JV, GV]

We cleared up some space in the
  
  15623   Tue Oct 13 11:13:54 2020 gautamUpdateBHDInvestigation into RF44 sensingAttachment
#1: spectra of the
 phaseNoisePSD.pdfloopTF.pdf 
  15622   Fri Oct 9 18:32:14 2020 anchalSummaryALSALS noise budget update - Updated AUX PDH Loop valuesThe only two PZT Phase modulation transfer
function measurements I could find are 40m/15206
  
  15621   Thu Oct 8 18:40:42 2020 KojiUpdateComputer Scripts / ProgramsFinesse GUIIs it better than Luxor? https://labcit.ligo.caltech.edu/~jharms/luxor.html   
  15620   Thu Oct 8 15:08:25 2020 gautamUpdateGeneralSome boxes moved from 40m entry hallway
UPS batteries
2x HEPA
filters
VWR chemicals (methanol)


These
boxes were moved from the 40m hallway to
  
  15619   Thu Oct 8 11:59:52 2020 ranaSummaryALSALS noise budget update - Updated AUX PDH Loop valuesFor all the loops where we drive the NPRO
PZT, there is some notch/resonance feature
due to the PZT mechanical resonance. In the
  
  15618   Thu Oct 8 08:37:15 2020 gautamUpdateComputer Scripts / ProgramsFinesse GUIThis
looks cool, we should have something similar,
can be really useful.
  
  15617   Wed Oct 7 16:56:23 2020 anchalSummaryALSALS noise budget update - Updated AUX PDH Loop valuesAUX PDH Loop update

I
used D1400293
to get the latest logged details about the
 Extract_X_AUX_PDH_Model.zipALS_NoiseBudgetUpdate.pdf 
  15616   Wed Oct 7 13:06:27 2020 KojiUpdateGeneralPresence in the labTue evening from 4pm~6pm, Koji made a social
distant tour for Anchal. We were present
around the PSL/AS/ETMX tables.
  
  15615   Tue Oct 6 14:35:16 2020 JordanUpdateVACSpare forepumpsI have placed 3 new in box, IDP 7 forepumps
along the x arm of the interferometer. These
are to be used as spares for both the 40m
  
  15614   Tue Oct 6 07:37:20 2020 yehonathanUpdateWikiNew TIS measurements of 40m OpticsLiYuan has kindly done some Total Integrating
Sphere (TIS) measurements on ITMU01 and ITMU02.
A summary of the measurement is attached.
 ITMU_sn01-02_tis_1.pdf 
  15613   Mon Oct 5 14:01:41 2020 gautamUpdateElectronicsaLIGO demod boards stuffed and deliveredWe received 20pcs of stuffed
demodulator
boards from Screaming Circuits today.
 IMG_8888.JPG 
  15612   Mon Oct 5 00:53:16 2020 KojiUpdateBHDSingle bounce interferometer locked🤘🤘🤘

 
  
  15611   Mon Oct 5 00:37:19 2020 gautamUpdateBHDSingle bounce interferometer lockedSummary:

The simple interferometer, composed
of a single bounce reflection from ITMY and
 simpleHomodyne.pngsingleBounceIFO.pdfproposedController.pdffreeRunningSuppressed.pdf 
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