40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log, Page 118 of 341  Not logged in ELOG logo
ID Date Authorup Type Category Subject Text Attachments
  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 
  16146   Wed May 19 18:29:41 2021 KojiUpdateSUSMass Properties of SOS Assembly with 3"->2" Optic sleeve, in SI unitsCalculation for the SOS POS/PIT/YAW resonant
frequencies

- Nominal height gap between the
 SOS_resonant_freq.pdfSOS_resonant_freq.nb.zip 
  16148   Thu May 20 16:56:21 2021 KojiUpdateElectronicsProduction version of the HV coil driver tested with KEPCO HV suppliesHP HV power supply ( HP6209
) were returned to Downs
 P_20210520_154523_copy.jpg 
  16149   Fri May 21 00:05:45 2021 KojiUpdateSUSNew electronics: Sat Amp / Coil Drivers11 new Satellite Amps were picked up from
Downs. 7 more are coming from there. I have
one spare unit I made. 1 sat amp has already
 F3CDEF8D-4B1E-42CF-8EFC-EA1278C128EB_1_105_c.jpeg 
  16150   Fri May 21 00:15:33 2021 KojiUpdateElectronicsDC Power Strip delivered / storedDC Power Strip Assemblies delivered and
stored behind the Y arm tube (Attachment
1)
 9x 
  16158   Mon May 24 20:55:00 2021 KojiSummaryBHDHow to align two OMCs on the BHD platform?Differential
misalignment of the OMCs

40m BHD will employ two OMCs on
  
  16172   Wed Jun 2 01:03:19 2021 KojiUpdateBHDSOS assemblyCan you just cut the viton tips smaller?
If you cut it to have some wedge (or say,
taper), it can get stuck with the vent hole.
  
  16173   Wed Jun 2 01:08:57 2021 KojiUpdateSUSCoM to Clamping Point Measurement for 3" Adapter RingHow about to use the non-Ag coated threaded
shaft + the end SS masses with helicoils
inserted? Does this save the masses to get
  
  16181   Thu Jun 3 22:08:00 2021 KojiUpdateCDSOpto-isolator for c1auxey- Could you explain what is the blue thing
in Attachment 1?

- To check the validity of the
  
  16184   Sun Jun 6 03:02:14 2021 KojiUpdateCDSOpto-isolator for c1auxeyThis RTS also use the BO interface with
an opto isolator. https://dcc.ligo.org/LIGO-D1002593

Could you also include the pull
  
  16198   Fri Jun 11 20:19:50 2021 KojiSummaryBHDBHD OMC invacuum wiringStephen and I discussed the in-vacuum OMC
wiring.

- One of the OMCs has already been
 40mBHD_OMC_wiring.pdf 
  16203   Tue Jun 15 21:48:55 2021 KojiUpdateCDSOpto-isolator for c1auxeyIf my understanding is correct, the (photo
receiving) NPN transistor of the optocoupler
is energized through the acromag. The LED
 Acromag_RTS_BI_config.jpg 
  16206   Wed Jun 16 19:34:18 2021 KojiUpdateGeneralHVACI made a flow sensor with a stick and tissue
paper to check the airflow.

- The HVAC indicator was not lit,
 HVAC_Power.jpegSouth_Arm.jpegSouth_End_Tenperature.jpegVertex.jpegEast_Arm.jpeg 
  16211   Thu Jun 17 22:19:12 2021 KojiUpdateElectronics25 HAM-A coil driver units delivered25 HAM-A coil driver units
were fabricated by Todd and I've transported
them to the 40m.
 P_20210617_195811.jpg 
  16212   Thu Jun 17 22:25:38 2021 KojiUpdateSUSNew electronics: Sat Amp / Coil DriversIt is a belated report: We received 5 more
sat amps on June 4th. (I said 7 more but
it was 6 more) So we still have one more
 P_20210604_231028.jpeg 
  16216   Fri Jun 18 23:53:08 2021 KojiUpdateBHDSOS assemblyThen, can we replace the four small EQ
stops at the bottom (barrel surface) with
two 1/4-20 EQ stops? This will require drilling
  
  16223   Thu Jun 24 16:40:37 2021 KojiUpdateSUSMC lock acquired back again[Koji, Anchal]

The issue
of the PD output was that the PD whitened
 P_20210624_163641_1.jpg 
  16240   Tue Jul 6 17:40:32 2021 KojiSummaryGeneralLab cleaningWe held the lab cleaning for the
first time since the campus reopening (Attachment
1).
 7x 
  16246   Wed Jul 14 19:21:44 2021 KojiUpdateGeneralBrrrJordan reported on Jun 18, 2021:

"HVAC tech came today, and replaced
  
  16250   Sat Jul 17 00:52:33 2021 KojiUpdateGeneralCanon camera / small silver tripod / macro zoom lens / LED ring light borrowed -> QILCanon camera / small silver tripod / macro
zoom lens / LED ring light borrowed ->
QIL
 P_20210716_213850.jpg 
  16252   Wed Jul 21 14:50:23 2021 KojiUpdateSUSNew electronicsReceived:

Jun 29, 2021 BIO I/F 6 units
Jul 19, 2021 PZT Drivers x2 / QPD
 P_20210629_183950.jpegP_20210719_135938.jpeg 
  16255   Sun Jul 25 18:21:10 2021 KojiUpdateGeneralCanon camera / small silver tripod / macro zoom lens / LED ring light returned / Electronics borrowedCamera and accesories returned

One HAM-A coildriver and one sat
amp borrowed -> QIL
  
  16260   Tue Jul 27 20:12:53 2021 KojiUpdateBHDSOS assembly1 or 2. The stained ones are just fine.
If you find the vented 1/4-20 screws in the
clean room, you can use them.
  
  16278   Thu Aug 12 14:59:25 2021 KojiUpdateGeneralPSL shutter was closed this morningWhat I was afraid of was the vacuum interlock.
And indeed there was a pressure surge this
morning. Is this real? Why didn't we
 Screen_Shot_2021-08-12_at_14.58.59.png 
  16279   Thu Aug 12 20:52:04 2021 KojiUpdateGeneralPSL shutter was closed this morningI did a bit more investigation on this.

- I checked P1~P4, PTP2/3, N2,
TP2, TP3. But found only P1a and P2 were
 Screen_Shot_2021-08-12_at_20.51.19.pngScreen_Shot_2021-08-12_at_20.51.34.png 
  16281   Tue Aug 17 04:30:35 2021 KojiUpdateSUSNew electronicsReceived:

Aug 17, 2021 2x ISC Whitening

Delivered 2x Sat Amp board to Todd
 P_20210816_234136.jpgP_20210816_235106.jpgP_20210816_234220.jpg 
  16284   Thu Aug 19 14:14:49 2021 KojiUpdateCDSTime synchornization not running131.215.239.14 looks like Caltech's
NTP server (ntp-02.caltech.edu)
https://webmagellan.com/explore/caltech.edu/28415b58-837f-4b46-a134-54f4b81bee53
  
  16288   Mon Aug 23 11:51:26 2021 KojiUpdateGeneralCampus Wide Power Glitch Reported: Monday, 8/23/21 at 9:30am Campus
Wide Power Glitch Reported:
Monday, 8/23/21 at 9:30am (more like 9:34am
  
  16290   Mon Aug 23 19:00:05 2021 KojiUpdateGeneralCampus Wide Power Glitch Reported: Monday, 8/23/21 at 9:30am Restarting the RTS was unsuccessful because
of the timing discrepancy error between the
RT machines and the FB. This time no matter
  
  16294   Tue Aug 24 18:44:03 2021 KojiUpdateCDSFB is writing the frames with a year old dateDan Kozak pointed out that the new frame
files of the 40m has not been written in
2021 GPS time but 2020 GPS time.
 Screen_Shot_2021-08-24_at_18.46.24.png 
  16306   Wed Sep 1 21:55:14 2021 KojiSummaryGeneralTowards the end upgrade- Sat amp
mod and test: on going (Tega)
- Coil driver mod and test: on going
  
  16308   Thu Sep 2 19:28:02 2021 KojiUpdate This week's FB1 GPS Timing Issue SolvedAfter the disk system trouble, we could
not make the RTS running at the nominal state.
A part of the troubleshoot FB1 was rebooted.
  
  16309   Thu Sep 2 19:47:38 2021 KojiUpdateCDSThis week's FB1 GPS Timing Issue SolvedAfter the reboot daqd_dc was not working,
but manual starting of open-mx / mx services
solved the issue.
  
  16310   Thu Sep 2 20:44:18 2021 KojiUpdateCDSChiara DHCP restartedWe had the issue of the RT machines rebooting.
Once we hooked up the display on c1iscex,
it turned out that the IP was not given at
  
  16311   Thu Sep 2 20:47:19 2021 KojiUpdateCDSChiara DHCP restarted[Paco, Tega, Koji]

Once chiara's DHCP is back,
things got much more straight forward.
  
  16312   Thu Sep 2 21:21:14 2021 KojiSummaryComputersVacuum recovery 2Attachment 1:
We are pumping the main volume with
TP2. Once P1a reached the pressure ~2.2mtorr,
 Screenshot_2021-09-02_21-20-24.pngScreenshot_2021-09-02_21-20-48.png 
  16316   Wed Sep 8 18:00:01 2021 KojiUpdateVACcronjobs & N2 pressure alertIn the weekly meeting, Jordan pointed out
that we didn't receive the alert for
the low N2 pressure.
  
  16317   Wed Sep 8 19:06:14 2021 KojiUpdateGeneralBackup situationTega mentioned in the meeting that it could
be safer to separate some of nodus's
functions from the martian file system.
  
  16328   Tue Sep 14 17:14:46 2021 KojiUpdateSUSSOS Tower HardwareYup this is OK. No problem.

 
  
  16331   Tue Sep 14 19:12:03 2021 KojiSummaryPEMExcess seismic noise in 0.1 - 0.3 Hz bandLooks like this increase is correlated
for BS/EX/EY. So it is likely to be real.

Comparison between 9/15
 C1-ALL_393F21_SPECTRUM-1315699218-86400.pngC1-ALL_393F21_SPECTRUM-1315267218-86400.png 
ELOG V3.1.3-