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  40m Log, Page 337 of 341  Not logged in ELOG logo
ID Date Author Type Categoryup Subject Text Attachments
  14336   Fri Dec 7 19:42:47 2018 ranaFrogselogcan't upgrade DokuWiki because of PHP / SL7All of our wikis (except the 40m one which
unfortunately got turned into ligo.org mess)
use DokuWiki. This now has an auto-upgrade
  
  15274   Fri Mar 13 12:48:47 2020 Larry WallaceUpdateelogCert RenewalUpdated the cert in /etc/httpd/ssl.
The new cert is good until March 12, 2022.
  
  16041   Fri Apr 16 11:31:00 2021 ranaUpdateelogelog stuck ~10 AM todayfound it unresponsive. Restarted fine using
procedure documented in wiki
  
  8606   Tue May 21 17:03:45 2013 SteveUpdateendtable upgradeenclosure tops are sealed

    

       
            
 ETMYoptable.jpgsurgtubclamps.jpgquickrelease.jpgreinforcbridge.jpg 
  8628   Thu May 23 12:02:48 2013 SteveUpdateendtable upgradeETMY - oplev Temporary oplev in place. The spot
on the qpd is still big. My two lens solution
did not work.
 ETMYopl.jpg 
  8655   Thu May 30 11:10:00 2013 SteveUpdateendtable upgradeETMY - oplev

    

       
            
 ETMYoplev.jpg 
  8660   Thu May 30 20:45:53 2013 AnnalisaUpdateendtable upgradeETMY - oplev

    

       
            
  
  8662   Fri May 31 11:15:01 2013 AnnalisaUpdateendtable upgradeETMY - Mode Matching for green - new calculation Since the beam waist after the Faraday
had changed since the last time I measured
it (maybe alignment changed a bit), I made
  
  8669   Tue Jun 4 10:44:13 2013 SteveUpdateendtable upgradePI pzt holders are readyThe PI pzt holders are back from the shop.
They are numbered 1, 2 & 3 and machined
to match.
 PIpztholders.jpg 
  8685   Thu Jun 6 09:58:13 2013 SteveUpdateendtable upgradeenclosure to chamber connection 
 Thin
wall connector from McMCarr#55275K25
 thinwallconnector.jpg06061301.PDF 
  8746   Tue Jun 25 19:18:07 2013 gautamConfigurationendtable upgradeplan of action for PZT installation  This entry is
meant to be a sort of inventory check and
  
  8800   Wed Jul 3 21:19:04 2013 gautamConfigurationendtable upgradeplan of action for PZT installation This is an update on the situation
as far as PZT installation is concerned.
I measured the required cable (PZT driver
 DAC_bank.pngASC_schematic.pdf 
  8804   Mon Jul 8 13:45:19 2013 gautamConfigurationendtable upgradeDriver board verificationWith the help of an expansion card,  I
verified that the + 15V and + 24V
from the eurocrate in the slot I've identified
  
  8823   Wed Jul 10 22:41:06 2013 gautamConfigurationendtable upgradePZT Driver Board I
did the following with the 
 HV_Amplifier.pdf 
  8827   Thu Jul 11 09:15:10 2013 SteveUpdateendtable upgradeETMY optable groundedETMY optical table top was grounded to
the ETMY chamber through 1 Mohms this morning.
I  also strain releifed
  
  8845   Mon Jul 15 11:51:18 2013 gautamConfigurationendtable upgradeDAC at 1Y4-Max Output and Power Spectrum Summary:
I measured the maximum output of
the DAC at 1Y4 as well as its power spectrum.
 max_amp.JPGmax_amp_all_channels.JPGDACOffPowerSpec.pdfDACOnPowerSpec.pdfDAC2kPowerSpectrum.pdf 
  8846   Mon Jul 15 13:51:17 2013 KojiConfigurationendtable upgradeDAC at 1Y4-Max Output and Power SpectrumWe need the unit of the voltage power spectrum
density to be V/sqrt(Hz).
  
  8848   Mon Jul 15 15:54:20 2013 gautamConfigurationendtable upgradeDAC at 1Y4- Power Spectrum -with the right units

    

       
            
 DACOffPSD.pdfDAC500PSD.pdfDAC2000PSD.pdf 
  8852   Mon Jul 15 17:20:43 2013 JenneConfigurationendtable upgradeDAC at 1Y4- Power Spectrum -with the right unitsThose 'peaks' for the oscillations seem
ridiculously broad.  I think you should
look again, really quickly, with smaller
  
  8853   Mon Jul 15 17:59:31 2013 gautamConfigurationendtable upgradeDAC at 1Y4- Power Spectrum -6.4kHz bandwidth

    

       
            
 DAC-6.4_kHz_BW_PSD.pdf 
  8857   Tue Jul 16 14:51:09 2013 gautamConfigurationendtable upgradeAI Board-D000186-Modified notches I tried shifting the notch frequencies
on the D000186-revision D board given to
me by Koji. The existing notches were at
 D000186_Frequency_Response.pdf 
  8873   Thu Jul 18 19:09:08 2013 gautamConfigurationendtable upgradeQPD Calibration for PZT CalibrationSummary 
I have been working on setting up
a QPD which can eventually be used to calibrate
 QPD-XCalib.pdfQPD-YCalib.pdfError_Function_Fitting.zip 
  8874   Thu Jul 18 20:20:52 2013 gautamConfigurationendtable upgradeFirst mirror glued to PZT and mounted in modified mounts 
 Yesterday,
I mounted the first PZT in one of the modified
 Piezo-mirror.jpg 
  8875   Thu Jul 18 21:12:58 2013 gautamConfigurationendtable upgradeAI Board-D000186-All channels modified 
 I carried some further modifications
and tests to the AI Board. Details and observations
 AI_Board_Output.jpg 
  8877   Thu Jul 18 23:34:40 2013 gautamConfigurationendtable upgradeCoarse adjustment of PZT axes orientation in mount I have
managed to orient the PZT in the mount such
that its axes are approximately aligned with
 PZT_out_waveform.jpg 
  8883   Fri Jul 19 22:51:40 2013 gautamConfigurationendtable upgradeSecond mirror glued to PZT and mounted  
I
 Piezo-mirror_2.JPG 
  8884   Fri Jul 19 23:35:31 2013 gautamConfigurationendtable upgradePreliminary Calibration of PZT I recalibrated
the QPD today as I had shifted its position
a little. I then identified the linear range
 QPD-XCalib.pdfQPD-YCalib.pdfPiezo_Yaw_Calib-in_QPD_linear_range-Pitch_tilt.pdfPiezo_Yaw_Calib-in_QPD_linear_range-Yaw_tilt.pdf 
  8892   Mon Jul 22 17:17:30 2013 annalisaUpdateendtable upgradeEnd table picture   YendTable.jpg 
  8896   Tue Jul 23 00:51:46 2013 KojiUpdateendtable upgradeEnd table pictureThe spot on the IPANG QPD was checked.
The spot is higher than the center and South
side of the lens.
 P7224222.JPGP7224223.JPGP7224224.JPGP7224238.JPG 
  8910   Tue Jul 23 19:37:08 2013 AnnalisaUpdateendtable upgradeEnd table picture

    

       
            
 IMG950073.jpgIMG950072.jpg 
  8912   Tue Jul 23 20:41:40 2013 gautamConfigurationendtable upgradeFull range calibration and installation of PZT-mounted mirrors Given
that the green beam is to be used as the
 M1_Pitch_calib.pdfM1_Yaw_calib.pdfM2_Pitch_calib.pdfM2_Yaw_calib.pdfPI_S330.20L.pdf 
  8930   Sun Jul 28 19:39:04 2013 AnnalisaUpdateendtable upgradePicture Yend table picture updated on the wiki
page
  
  8932   Mon Jul 29 13:39:25 2013 gautamConfigurationendtable upgradePZT Driver Board-further changes 
 
I have
 D980323-C-modified.pdfD980323-C-modified-pg2.pdf 
  8935   Mon Jul 29 21:57:45 2013 gautamConfigurationendtable upgradeHardware installed at 1X9 The following hardware   
  8942   Tue Jul 30 19:40:47 2013 gautamConfigurationendtable upgradeDAC-PZT Driver Board Output Signal Chain Tested 
 [Alex, Gautam]
  
  8943   Tue Jul 30 19:44:05 2013 gautamConfigurationendtable upgradeSecond mirror glued to PZT and mounted  
 I have
  
  8967   Mon Aug 5 18:48:44 2013 gautamConfigurationendtable upgradeFull range calibration of PZT mounted mirrors for Y-endtable I
had prepared two more PZT mounted mirrors
for the Y-end some time back. These are:
 2-inch-CVI-Yawcalib.pdf2-inch-CVI-Pitchcalib.pdf1-inch-Laseroptik-Yawcalib.pdf1-inch-Laseroptik-Pitchcalib.pdf 
  9451   Mon Dec 9 11:44:08 2013 SteveUpdateendtable upgradeETMY optable got new beam dumpAluminum shield replaced by razor beam
dump.
 ETMYoptBefore.jpgETMYoptAfter.jpg 
  9941   Mon May 12 14:42:25 2014 steveUpdateendtable upgradeoptical table enclosure wall proposal and table at ETMY

    

       
            
 Hilite70.jpgETMY-ISCT.jpgRoscoThermashield.pdf 
  11591   Fri Sep 11 10:56:47 2015 SteveUpdateendtable upgradeETMY optical table feedthroughThe ETMY enclosure feedthrough - north
is installed. The sealing material is hard
to work with.
 ETMY-Nfeedt.jpg 
  11600   Tue Sep 15 16:49:08 2015 SteveUpdateendtable upgradeETMY optical table feedthroughETMY optical table enclosure feedthrough-
south is in. Now it is time to see how air
tightness increases performance.
 ETMYsFeedt.jpg 
  11608   Thu Sep 17 02:22:53 2015 SteveUpdateendtable upgradeETMY optical table feedthroughI doubt we'll see any effect until
we carefully seal the holes. If there's
1 hole in your boat it still sinks.
  
  11897   Tue Dec 22 16:39:42 2015 SteveUpdateendtable upgradeETMY optical table enclosureI think there should be a scientifically
based aveluation of the ETMY enclosure so
we can make the ETMX better.
 IMG_0028.JPGIMG_0027.JPGETMY-ISCT_EISOL.jpg 
  12029   Thu Mar 10 16:29:32 2016 gautamUpdateendtable upgradeInventory checkI did a quick sweep of the lab to find
out what hardware has already been acquired
for the X-end table upgrade. The attached
 Inventory_check.pdfDoubler_comparison.pdf 
  12030   Thu Mar 10 16:32:45 2016 ranaUpdateendtable upgradeInventory checkIts not a good idea to use green mounts
with green lasers. Steve should be able to
get another copy of the EY doubler mount
  
  12033   Mon Mar 14 22:42:23 2016 gautamUpdateendtable upgradeInventory check


  
  12051   Mon Mar 28 10:43:18 2016 SteveUpdateendtable upgradeETMX 4'x2' optical table pictures 

 
 ETMX4x2Layout.jpgETMX_4x2.JPGETMXopt_4x2.JPG 
  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 
  12057   Thu Mar 31 09:38:41 2016 SteveUpdateendtable upgradeY end 4x3 existing layoutBeam colors: 1064 nm red, 514 nm green
and 633 nm yellow.

There should be room for lens in
 ETMY4x3layout.jpg 
  12058   Thu Mar 31 19:49:31 2016 gautamUpdateendtable upgradeproposed layout v2The major changes from the previous layout:


I've depicted the Green
reflected beam path more accurately - I approximately measured
 ETMX_proposed_layout_v2.pdf 
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