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ID Date Author Type Category Subjectup Text Attachments
  14132   Fri Aug 3 19:02:11 2018 gautamUpdateASSX arm ASS recovery[koji,
gautam]

After I effected the series resistance
  
  14161   Tue Aug 14 00:50:32 2018 gautamUpdateASSX arm ASS still not quite right?While working on the single arm alignment,
I noticed that today, i was able to get the
X arm transmission back to ~1.22, and the
 POXPOY.pngIMG_7108.JPG 
  10865   Wed Jan 7 11:20:22 2015 SteveUpdateLSCX arm T-QPD gets SM1 thread adapterC1:SUS-ETMX_QPD is removed and internal
SM1 thread adapter epoxied into position
as it is at
  
  9594   Tue Feb 4 00:42:18 2014 KojiUpdateGeneralX arm aligned for IR/GRThe
X arm was also aligned for the IR by hand
and ASS. Also the X end green PZT was aligned
  
  6849   Thu Jun 21 15:36:51 2012 yutaUpdateLockingX arm alignmentI aligned X arm so that the beam spot comes
roughly on the center.
  
  4278   Sun Feb 13 15:02:23 2011 kiwamuUpdateGreen LockingX arm beam offcentering has been measuredThe amounts
of the X arm's beam off-centering have been
 misposition.png 
  8820   Wed Jul 10 11:27:02 2013 manasaUpdateGreen LockingX arm beatnote foundI found the beat note for X arm. I did
not change anything this morning (to the
best of my knowledge). Hooking up the spectrum
  
  8296   Thu Mar 14 17:31:57 2013 ManasaUpdateGreen LockingX arm green locked in TEM00

    

       
            
  
  8298   Fri Mar 15 01:57:02 2013 JenneUpdateGreen LockingX arm green locked in TEM00This work earlier today had required moving
the harmonic separator back closer to its
original position, so that the green could
  
  9233   Fri Oct 11 00:37:23 2013 manasaUpdateGreen LockingX arm green locking modes[Masayuki, Manasa]
We have stabilized the ALS for Y
arm and concluded that although the PDH servo
 MON4_1065505017.bmpMON4_1065504975.bmp 
  12478   Thu Sep 8 22:12:36 2016 gautamUpdateSUSX arm in place, locked to green, IR flashes visibleDetailed elog to follow but summary of
todays activities:


ITMX and ETMX are back
  
  11111   Fri Mar 6 14:51:59 2015 ericqUpdateGeneralX arm linewidth, lossThe fit FWHM is 10.444kHz
+-55Hz. 
 test.png 
  4191   Mon Jan 24 02:58:46 2011 kiwamuUpdateGreen LockingX arm locked !I succeeded in  time_series.pnggreen_one_arm.png 
  4192   Mon Jan 24 09:33:08 2011 ranaUpdateGreen LockingX arm locked !Very cool.
But the PLL seems very fishy to me.
The ZP-3MH needs 13 dBm to operate correctly.
  
  4193   Mon Jan 24 10:19:21 2011 KojiUpdateGreen LockingX arm locked !Well... The ALS loop is engaged and the
error was suppressed. 
So, how is the IR error signal stabilized
  
  4153   Fri Jan 14 01:55:26 2011 kiwamuUpdateLSCX arm locked with C1LSC digital control [Koji, Kiwamu]
  
  4156   Fri Jan 14 12:34:08 2011 KojiUpdateLSCX arm locked with C1LSC digital controlMy feeling was that the saturation was
caused by the LSC whitening filter which
was always on.
  
  5360   Wed Sep 7 17:28:41 2011 kiwamuUpdateLSCX arm loss measurement : not goodThe measurement
itself wasn't good.
 Xarmlossmeasurement.png 
  14552   Thu Apr 18 23:10:12 2019 gautamUpdateLoss MeasurementX arm misalignedYehonathan wanted to take some measurements
for loss determination. I misaligned the
X arm completely and we installed a PD on
  
  6859   Sat Jun 23 02:29:18 2012 yutaUpdateGreen LockingX arm mode scan resultsX
arm finesse is 416 +/- 6, mode-matching ratio
is 91.2 +/- 0.3%
 XarmScan20120623.pngfine8FSRscanXarm.png 
  10680   Thu Nov 6 12:53:09 2014 diegoUpdateASCX arm restored[Diego, Koji]
X arm has been restored, after modifying
the two parameters mentioned in http://nodus.ligo.caltech.edu:8080/40m/10676
  
  12474   Tue Sep 6 20:45:14 2016 gautamUpdateSUSX arm test masses back in chamber[Teng, Johannes,
Lydia, gautam]


The
 IMG_3137.JPGIMG_3143.JPGIMG_3142.JPGIMG_3148.JPG 
  10702   Wed Nov 12 15:14:09 2014 manasaUpdateGeneralX end AUX laser fiber setup I looked at the endtable for possible
space to setup optics in order to couple
the X end laser into a PM fiber.
 ETMXtable.png 
  10831   Mon Dec 22 17:06:14 2014 manasaUpdateGeneralX end AUX laser fiber setup

    

       
            
  
  10834   Tue Dec 23 13:18:37 2014 manasaUpdateGeneralX end AUX laser fiber setup

    

       
            
  
  12526   Fri Sep 30 19:53:07 2016 gautamUpdateendtable upgradeX end IR pickoff fiber coupled[johannes, gautam]

Today we re-installed the fiber
coupler on the X-endtable to couple some
  
  9455   Thu Dec 12 00:21:04 2013 KojiUpdateGreen LockingX end PDH box oscillation issue solved (Re: screwed up the end PDH box)What
a such long pain we suffered.
After more than three years from
  
  4297   Tue Feb 15 06:59:57 2011 Suresh, JenneOmnistructureGeneralX end enclosure left open[Jenne, Suresh]
 Jenne found the X-end table
enclosure had been left open.  She replaced
  
  10730   Fri Nov 21 11:41:24 2014 manasaUpdateGeneralX end fiber insulated and on cable tray

    

       
            
  
  10739   Mon Dec 1 15:41:38 2014 SteveUpdateGeneralX end fiber insulated and on cable tray


   
        
            
  
  7274   Fri Aug 24 21:00:40 2012 KojiUpdateLSCX end green investigationI checked and fixed the X end green situation.
Now
the X green beam is locked with TEM00.
  
  10873   Wed Jan 7 19:49:09 2015 manasaUpdateGeneralX end space issuesI have attached a photo of the ETMX table.
The path of the 1064nm light rejected after
the doubler and the green light are indicated
 ETMXspace.png 
  10955   Thu Jan 29 10:14:21 2015 manasaUpdateGeneralX end space issuesIt is certain that we have space issues
at the X end that has been preventing us
from sticking in a lens to couple light into
 photo.pngdrawing.png 
  12056   Wed Mar 30 17:38:52 2016 gautamUpdateendtable upgradeX end table proposed layout Attachment 1: This
is a photo of the current X end table optical
layout with the beampaths of the various
 ETMX_3x2.JPGlayout_details_20160328.pdfETMX_proposed_layout.pdf 
  10457   Fri Sep 5 04:07:44 2014 ericqUpdateGreen LockingX end uPDH Box ReplacedJust a quick note, plots and data will
come tomorrow:
I grabbed an unused uPDH board from
  
  12073   Wed Apr 13 00:56:07 2016 gautamUpdateendtable upgradeX endtable repopulationOver the last couple of days, I've
been working on restoring the optical layout
on the X-endtable. Some notes about the status
  
  12074   Wed Apr 13 11:00:28 2016 SteveUpdateendtable upgradeX endtable repopulationETMX optical table is grounded to ETMX
chamber through 1 Mohms

The doubling oven temp controller
  
  10981   Thu Feb 5 15:21:25 2015 manasaUpdateGeneralX endtable work [EricG, Manasa]

We were at the X end today trying
to couple AUX X light into the fiber. 
  
  10978   Wed Feb 4 21:09:43 2015 manasaUpdateGeneralX endtable work scheduled tomorrowThe X end fiber setup will be put together
tomorrow morning.
  
  5133   Sun Aug 7 14:01:58 2011 kiwamuUpdateGreen LockingX green beam re-aligned[Jenne / Kiwamu]
 The
  
  5135   Sun Aug 7 18:41:12 2011 JenneUpdateGreen LockingX green beam re-aligned


   
        
            
  
  6342   Wed Feb 29 20:27:00 2012 JenneUpdateGreen LockingX green beat - found it!Found it!
The actual temperature of the Xend
  
  8666   Mon Jun 3 21:09:55 2013 ManasaUpdateGreen LockingX green beatnote through beatboxI connected the X green beat PD output
back to the beatbox, did the usual PSL alignment
for green and searched for the beat note
 IMG_0608.JPG 
  10000   Wed May 28 17:51:48 2014 manasaUpdateLSCX green broadband PD NOT working

    

       
            
  
  10001   Wed May 28 19:15:38 2014 KojiUpdateLSCX green broadband PD NOT workingIf the PD is the suspect, just pull it
from the table and bring it to the PD testing
setup.
  
  9996   Tue May 27 21:48:31 2014 JenneUpdateLSCX green broadband PD not working???!?Grr.  I am very frustrated. 
After lunch I redid alignment for both X
and Y green systems (Yarm both at the end
 ALS_outofloop_27May2013_2.pdf 
  11473   Fri Jul 31 10:36:22 2015 SteveUpdatePEMX seismo station short cable removed 




 IMG_0009.JPG 
  11475   Sat Aug 1 20:46:29 2015 KojiUpdatePEMX seismo station short cable removedOMG   
  9496   Thu Dec 19 19:45:12 2013 ericqUpdateGreen LockingX-Arm Green PDH Loop StuffWith the fixed servo box, I remeasured the
OLTF, the servo, and the low pass filter
between the mixer output and servo input.
 xarmPDHtfs.pdfxarmCLG.pdflayout.pdf 
  7171   Tue Aug 14 04:53:45 2012 YoichiSummaryLSCX-Arm noise spectrumYoichi, Rana
Here is the noise spectrum of the
X-arm error signal along with the TRX DC
 xarm-spectrum.png 
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