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  40m Log, Page 316 of 349  Not logged in ELOG logo
ID Date Author Type Categoryup Subject Text Attachments
  14009   Fri Jun 22 18:30:21 2018 gautamUpdateSUSITMY_UL sensorI think if the magnet fell off, we would
see high DC signal, and not 0 as we do now.
I suspect satellite box or PD readout board/cabling.
  
  14012   Sun Jun 24 20:02:07 2018 gautamUpdateSUSSome notes about coil driver noiseSummary:

For a series resistance of 4.5
kohm, we are suffering from the noise-gain
 CoilDriverSchematic.pdfD010001_2k_fastOnly_2.25k.pdfD010001_4k_fastOnly_4.5k.pdf 
  14019   Tue Jun 26 16:28:00 2018 gautamUpdateSUSCoil driver protoboard characterizationI wanted to investigate my coil driver
noise measurement technique under more controlled
circumstances, so I spent yesterday setting
 IMG_7060.JPGETMXstitchced.pdfETMXfullSpan.pdfPSRR.pdf 
  14032   Thu Jun 28 16:48:27 2018 gautamUpdateSUSSOS cage towers For the upcoming vent, we'd like to
rotate the SOS towers to correct for the
large YAW bias voltages used for DC alignment
  
  14034   Mon Jul 2 09:01:11 2018 SteveUpdateSUSITMY_UL sensorThis bad connection is coming back




 ITMY_ULcripingback.png 
  14038   Thu Jul 5 10:15:30 2018 gautamUpdateSUSPRM watchdog trippedPRM watchdog was tripped around 7:15am
PT today morning. I restored it.
 PRM_watchdogTrip.png 
  14075   Tue Jul 17 01:07:40 2018 gautamUpdateSUSETMY EQ stopsFor the heater setup on EY table, I EQ-stopped
ETMY. Only
  
  14090   Fri Jul 20 07:43:54 2018 SteveSummarySUSETMY  

 
 ETMY_leveling.pngETMY.png 
  14108   Fri Jul 27 10:48:57 2018 SteveUpdateSUSBS oplev windowYesterday I inspected this BS oplev viewport.
The heavy connector tube was shorting to
table so It was moved back towards the chamber.
 BSOw_.jpgdustInsideBSO.jpg 
  14115   Mon Jul 30 11:05:44 2018 gautamUpdateSUSIFO SUS wonkyWhen I came in this morning:


PMC was unlocked.
Seis
BLRMS were off scale.
ITMX OSEM
 IMG_7102.JPG 
  14117   Mon Jul 30 16:11:54 2018 gautamUpdateSUSTrillium interface box is broken[koji,
steve, gautam]
  
  14118   Mon Jul 30 18:19:03 2018 KojiUpdateSUSTrillium interface box was fixed and reinstalledThe trillium interface box was removed
from the rack.

The
 P_20180730_173134.jpgP_20180730_180151.jpg 
  14119   Tue Jul 31 08:17:55 2018 SteveUpdateSUSTrillium interface box was fixed,reinstalled & working 

 
 all_OK.png 
  14129   Fri Aug 3 15:53:25 2018 gautamUpdateSUSLow noise bias path ideaSummary:

The idea we are going with to push
the coil driver noise contribution down is
 LT1055_precOpAmp.pdf 
  14130   Fri Aug 3 16:27:40 2018 ranaUpdateSUSLow noise bias path ideaBah! Too complex.   
  14131   Fri Aug 3 18:54:58 2018 gautamUpdateSUSGlitchy MC1The wall StripTool indicated that the IMC
wasn't too happy when I came in today.
Specifically:
 MC1_sensorAnomaly.png 
  14134   Sun Aug 5 13:45:00 2018 gautamUpdateSUSETMX trippedIndependent from the problems the vertex
machine has been having (I think, unless
it's something happening over the shared
 ETMX_tripped.pngETMX_tripped_zoom.png 
  14135   Sun Aug 5 15:43:50 2018 gautamUpdateSUSAnother low noise bias path ideaOK, how about this:


Attachment
 HV_Bias_schematic.pdfTF.pdfbias.pdfHVbias_currentNoise.pdf 
  14147   Wed Aug 8 23:06:59 2018 gautamUpdateSUSAnother low noise bias path ideaToday while Rich Abbott was here, Koji
and I had a brief discussion with him about
the HV amplifier idea for the coil driver
  
  14150   Thu Aug 9 12:40:14 2018 gautamUpdateSUSETMX trip follow-upA brief follow-up on this since we discussed
this at the meeting yesterday: the attached
DV screenshot shows the full 2k data for
 ETMXglitch.png 
  14156   Mon Aug 13 09:56:23 2018 SteveUpdateSUSETMX trip follow-upHere is an other big one




 ETMXglitch.pngETMXgltch.png 
  14165   Wed Aug 15 19:18:07 2018 gautamUpdateSUSAnother low noise bias path ideaI took another pass at this. Here is what
I have now:

Attachment
 HV_Bias.pdfHVamp_TF.pdfHVamp_noises.pdfcurrentNoises.pdfHVamp.fil.zip 
  14169   Thu Aug 16 23:06:50 2018 gautamUpdateSUSAnother low noise bias path ideaI had a very fruitful discussion with Rich
about this circuit today. He agreed
with the overall architecture, but made the
 HVamp_schem.PDFHvamp.zip 
  14178   Thu Aug 23 08:24:38 2018 SteveUpdateSUSETMX trip follow-upGlitch, small amplitude, 350 counts 
&  no trip.

 ETMX-UL_glitch.pngPEM_4d.png 
  14184   Fri Aug 24 14:58:30 2018 SteveUpdateSUSETMX trips againThe second big glich trips ETMX sus. There
were small earth quakes around the glitches.
It's damping recovered.
 glitches.png 
  14188   Wed Aug 29 09:20:27 2018 SteveUpdateSUSlocal 4.4M earth quakeAll suspension tripped. Their damping restored.
The MC is locked.

ITMX-UL & side magnets are
 4.4_La_Verne.png3.4_&_4.4M_EQ.png 
  14190   Wed Aug 29 11:46:27 2018 JonUpdateSUSlocal 4.4M earth quakeI freed ITMX and coarsely realigned the
IFO using the OPLEVs. All the alignments
were a bit off from overnight.
  
  14201   Thu Sep 20 08:17:14 2018 SteveUpdateSUSlocal 3.4M earth quakeM3.4 Colton shake did not trip sus.

 
 local_3.4M.png 
  14223   Mon Oct 1 22:20:42 2018 gautamUpdateSUSPrototyping HV Bias CircuitSummary:

I've been plugging away at
Altium prototyping the high-voltage bias
 CoilDriverBias.pdfcurrentNoise.pdfPSRR.pdf 
  14261   Thu Oct 18 00:27:37 2018 KojiUpdateSUSSUS PD Whitening board inspection[Gautam, Koji]

As a part of the preparation for
the replacement of c1susaux with Acromag,
 43.png 
  14319   Mon Nov 26 17:16:27 2018 gautamUpdateSUSEY chamber work[steve,
rana, gautam]


PSL and EY 1064nm laser
 IMG_5251.JPG 
  14399   Tue Jan 15 10:52:38 2019 gautamUpdateSUSEY door opened[chub, bob, gautam]

We took the heavy door off the
EY chamber at ~930am.
  
  14401   Tue Jan 15 15:49:47 2019 gautamUpdateSUSEY door openedWhile restoring OSEMs on ETMY, I noticed
that the open voltages for the UR and LL
OSEMs had significantly (>30%) changed
 EY_OSEMs.png 
  14403   Wed Jan 16 16:25:25 2019 gautamUpdateSUSYarm locked[chub, gautam]

Summary:

Y arm was locked at low power in
 Yarm_locked.png 
  14407   Fri Jan 18 21:34:18 2019 gautamUpdateSUSUnused optic on EY tableDoes anyone know what the purpose of the
indicated optic in Attachment #1 is? 
 IMG_5408.JPG 
  14408   Sat Jan 19 05:07:45 2019 KojiUpdateSUSUnused optic on EY tableI don't think it was used. It is not
on the diagram too. You can remove it.
  
  14409   Sat Jan 19 15:33:18 2019 gautamUpdateSUSETMY OSEMs faultyAfter diagnosis with the tester box, as
I suspected, the fully open DC voltages on
the two problematic channels, LL and UR,
 Screen_Shot_2019-01-19_at_3.32.35_PM.pngETMY_sensors_1231832635.pdf 
  14411   Tue Jan 22 20:36:53 2019 gautamUpdateSUSETMY OSEMs faultyShort update on latest Satellite box woes.


I checked the resistance
of all 5 OSEM coils on ETMY using a DB25
  
  14413   Wed Jan 23 12:39:18 2019 gautamUpdateSUSEY chamber workWhile Chub is making new cables for the
EY satellite box...


I removed the unused
 6x 
  14415   Wed Jan 23 23:12:44 2019 gautamUpdateSUSPrep for FC cleaningIn preparation for the FC cleaning, I did
the following:


Set up mini-cleanroom at
 IY_level_before.pdf 
  14416   Thu Jan 24 15:32:31 2019 gautamUpdateSUSY arm cavity side first contact appliedEY:


A clean cart was setup
adjacent to the HEPA-enclosed mini cleanroom
 Yarm_FC.pdfOSEMfilter.png 
  14422   Tue Jan 29 22:12:40 2019 gautamUpdateSUSAlignment prepSince we may want to close up tomorrow,
I did the following prep work:


Cleaned up Y-end suspension
  
  14423   Wed Jan 30 11:54:24 2019 gautamUpdateSUSMore alignment prep[chub,
gautam]


ETMY cage was wiped down

Targeted
 IMG_5958.JPGIMG_5962.JPG 
  14424   Wed Jan 30 19:25:40 2019 gautamUpdateSUSXarm cavity alignmentSquishing cables at the ITMX satellite
box seems to have fixed the wandering ITM
that I observed yesterday - the sooner we
 Xarm.pngXarm_IR.png 
  14425   Fri Feb 1 01:24:06 2019 gautamUpdateSUSAlmost ready for pumpdown tomorrow[koji, chub, jon, rana, gautam]

Full story tomorrow, but we went
through most of the required pre close-up
  
  14426   Fri Feb 1 13:16:50 2019 gautamUpdateSUSPumpdown 83 underway[chub, bob, gautam]


Steps described in previous
elog were carried out
EY heavy
  
  14427   Fri Feb 1 14:44:14 2019 gautamUpdateSUSY arm FC cleaning and reinstall[Attachment
#1]: ITMY HR face
 IMG_5974.JPGIMG_5986.JPGIMG_5992.JPG 
  14428   Fri Feb 1 21:52:57 2019 gautamUpdateSUSPumpdown 83 underway[jon, koji, gautam]


IFO is at ~1 mtorr, but
pressure is slowly rising because of outgassing
  
  14433   Mon Feb 4 20:13:39 2019 gautamUpdateSUSETMY suspension oddnessI looked at the free-swinging sensor data
from two nights ago, and am struggling with
the interpretation. 
 ETMY_sensors_1_Feb_2019_2230_PST.pdfETMY_UL.pdfETMY_sensors_timeDomain.pdf 
  14441   Thu Feb 7 19:34:18 2019 gautamUpdateSUSETMY suspension oddnessI did some tests of the electronics chain
today.


Drove a sine-wave using
 ETMY_sensors.pdfpostDiag.pdf 
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