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  40m Log, Page 78 of 341  Not logged in ELOG logo
ID Dateup Author Type Category Subject Text Attachments
  3882   Mon Nov 8 18:30:33 2010 SureshUpdateIOOMC Trans Mon QPD gain increased by 50xIncreased
the transimpedance gain of the MC-Trans-Mon
QPD ckt 
  
  3883   Tue Nov 9 05:40:12 2010 yutaSummaryIOOMC aligning going on(Suresh, Yuta)

Background:
 MCalignNov9.png 
  3884   Wed Nov 10 02:51:35 2010 yutaSummaryIOOlimitation of current MC aligning(Suresh, Yuta)

Summary:
 MCalignNov9.png 
  3885   Wed Nov 10 11:46:19 2010 KojiSummaryIOOlimitation of current MC aligningIt didn't make sense in several points.
1. Is the Faraday aperture really
3mm? The beam has the gaussian radius of
  
  3886   Wed Nov 10 12:21:18 2010 yutaSummaryIOOlimitation of current MC aligning1. We didn't measure the aperture size
last night. We have to check that.
  
  3887   Wed Nov 10 14:28:33 2010 KojiSummaryIOOlimitation of current MC aligning1. Look at the Faraday.
2. Look at the wiki. There is the
optical layout in PNG and PDF.
  
  3888   Wed Nov 10 22:29:42 2010 kiwamuUpdateIOOmisaligned the wideband EOMFor Yuta's
business, I intentionally misaligned the
  
  3889   Thu Nov 11 01:34:27 2010 JenneUpdateSUSNew-Old ETM towers assembled[Suresh, Jenne]
We have put together the new-old
ETM towers.  These are the ones which
  
  3890   Thu Nov 11 02:17:27 2010 KevinUpdateElectronicsREFL11 Photodiode Not Working[Koji and Kevin]
I was trying to characterize the
REFL11 photodiode by shining a flashlight
  
  3891   Thu Nov 11 04:32:53 2010 yutaSummaryCDSfound poor contact of DAC cable, previous A2L results were wrong(Koji, Jenne, Yuta)

  
  3892   Thu Nov 11 05:56:04 2010 yutaSummaryIOOsetting up temporary oplev for coil balancing of MCs(Suresh, Yuta)

Background:
 MC2coils.png 
  3893   Thu Nov 11 07:26:03 2010 AlbertoUpdateElectronicsREFL11 Photodiode Not Working


   
        
            
  
  3894   Thu Nov 11 11:08:26 2010 steveBureaucracyPEMAP table found openPlease remember to cover the optical tables
!
  
  3895   Thu Nov 11 11:51:30 2010 KojiSummaryCDSfound poor contact of DAC cable, previous A2L results were wrongThe cause is apparent!
The connectors on the cables are wrong!
  
  3896   Thu Nov 11 13:54:05 2010 kiwamuUpdateGreen Locking80MHz VCO : about PLL hold-in range

The hold-in
 range_green.pngPLL.png 
  3897   Thu Nov 11 15:27:43 2010 valera, steveConfiguration ISS AOM installed We installed the ISS AOM in the PSL.
The AOM was placed right after the EOM. The
beam diameter is ~600 um at the AOM. The
  
  3898   Thu Nov 11 17:47:36 2010 kiwamuUpdateGreen Locking80MHz VCO : improve PLL hold-in range and put a boostIn order
to enlarge the hold-in range I modified the
 vco_pll.pngVCO_lfb.png 
  3899   Thu Nov 11 18:05:55 2010 valeraUpdatePSLPMC mode matching at full laser power The
PMC mode matching was initially done at low
power ~150 mW. It was expected and found
 scan.pdfpmc2-abcd.png 
  3900   Thu Nov 11 21:07:49 2010 josephbUpdateCDSPlugged c1iscex into DAQ network - still causes network slowdownI connected the c1iscex computer to the
dedicated DAQ network switch (located in
1X7).
  
  3901   Thu Nov 11 23:35:23 2010 KojiSummaryCDSfound poor contact of DAC cable, previous A2L results were wrong[Koji / Yuta]
There were
 IMG_3698.jpgbad-boys.pngIMG_3705.jpgIMG_3706.jpg 
  3902   Fri Nov 12 00:13:34 2010 SureshUpdateSUSETM assembly started[Jenne,
Suresh]
Selection
  
  3903   Fri Nov 12 00:42:11 2010 rana, kojiUpdateIOOMC alignmentWe decided to ignore the computer script
outputs for the beam positions and use instead
the eyeball method to get the beam into the
  
  3904   Fri Nov 12 02:51:20 2010 KevinUpdateElectronicsPhotodiode Testing[Jenne and Kevin]
I started testing the REFL55 photodiode.
With a light bulb, I saw ~270 mV of DC voltage
  
  3905   Fri Nov 12 06:10:24 2010 yutaUpdateIOOMC aligned (without coil balancing)Background:
  Last night, we found that one
of DAC channels are poorly connected, so
 MCalignCALIB.png 
  3906   Fri Nov 12 10:49:34 2010 josephb, valeraUpdateCDSTest of ADC noiseTest:
Look at the effects of the ADC voltage
range on the ADC noise floor.
 ADC_noise.pdf 
  3907   Fri Nov 12 11:36:06 2010 AidanConfigurationComputersFixed the PERL PATH errors from the scripts directory change I've been trying to get a PID loop
running for the green locking and I've discovered
that some of the directories in the path
  
  3908   Fri Nov 12 12:06:11 2010 AidanConfigurationGreen LockingPID script working - now it needs to be tuned I've set up a PID script that senses
the EX-PSL Green Beat note (from the frequency
counter) and actuates on the temperature
 Screen_shot_2010-11-12_at_12.05.01_PM.png 
  3909   Fri Nov 12 13:12:55 2010 kiwamuUpdatePSLincreased NPRO powerI maximized
the laser power by rotating the HWP after
  
  3910   Fri Nov 12 19:24:56 2010 KojiUpdateCDSTest of ADC noise[Koji Yuta]
We found one of the ADC cables were
left unconnected. This left the MC suspensions
  
  3911   Fri Nov 12 20:40:51 2010 josephb, yuta, valeraConfigurationElectronicsAA voltage rangeWe changed the range of the two SUS AA
boards in the corner from +/-2 V to +/-10
V by changing the supply voltage from +/-5
  
  3912   Sat Nov 13 15:53:05 2010 yutaUpdateCDSdiagonalization of MC input matrixMotivation:
  MC is aligned from the A2L
measurement, but to do the beam centering
 MCspectraNov09.pngMCspectraNov13.pngMC1spetra_wrongmatrix.png 
  3913   Sat Nov 13 16:57:21 2010 valeraConfigurationElectronicsPRM Side OSEM transimpedance changeNow that we have increased the range of
the AA to +/- 10 V I have increased the PRM
side OSEM transimpedance from 29 kV/A to
 PRM-SD-ADC.pdfPRM-SD-Current.pdf 
  3914   Sun Nov 14 02:59:31 2010 ranaConfigurationGeneralMEDM snapshots web pageSince Nodus is a Solaris machine it can
barely handle doing the ImageMagick commands
(such as convert and import). I removed
  
  3915   Sun Nov 14 11:56:59 2010 valeraUpdateCDSTest of ADC noise 
We missed
  
  3916   Sun Nov 14 16:26:31 2010 jenne, valeraUpdateElectronicsSRM side OSEM noise with no magnetWe realized that the SRM sensors are connected
to the readout but just sitting on the BS
in vacuum table with no magnets and therefore
 SRM-SD-Current-NoMagnet.pdf 
  3917   Sun Nov 14 16:40:46 2010 JenneUpdateTreasureActivities related to OSEM measurement[Valera, Jenne]
We pondered the idea of clamping
the PRM optic to measure the OSEM noise. 
  
  3918   Mon Nov 15 04:57:10 2010 ranaUpdateElectronicsSRM side OSEM noise with no magnetIF I believe this calibration and IF I
believe that the noise is the same with no
magnet in there, then its almost 1
  
  3919   Mon Nov 15 11:13:12 2010 josephbUpdateCDSModified rc.local to not start mx_streams automaticallyProblem:
c1iscex floods the network with about
1 gigabyte of error messages in a few seconds,
  
  3920   Mon Nov 15 11:52:22 2010 kiwamuUpdateGreen LockingPLL with real green signal   PLL_with_green.png 
  3921   Mon Nov 15 14:36:37 2010 KojiUpdatePSLC1PSL rebooted? Has C1PSL rebooted? Has burtrestore been
forgotten? Even without elog?
We found some settings are wrong
  
  3922   Mon Nov 15 14:42:01 2010 AidanUpdatePSLC1PSL rebooted? Yeah. Joe and I rebooted c1psl a couple
of times this morning. I didn't realize the
burtrestore wasn't automatic.
  
  3923   Mon Nov 15 15:01:51 2010 kiwamuUpdateIOOrealigned the wideband EOMSince we are going to lock the MC today,
I
aligned it back to the default place.
  
  3924   Mon Nov 15 15:02:00 2010 KojiSummaryPSLpower measurements around the PMC[Valera Yuta Kiwamu Koji]
Kiwamu burtrestored c1psl.  We measured
the power levels around the PMC.
  
  3925   Mon Nov 15 16:09:44 2010 JenneUpdateVACETMX, ETMY, ITMY chambers opened[Steve, Jenne, Suresh, Koji]
The remaining test mass chambers
have been opened, and have light doors in
  
  3926   Mon Nov 15 16:26:46 2010 josephbUpdateCDSc1iscex is now running and the network hasn't diedProblem:
c1iscex was spamming the network
with error messages.
  
  3927   Mon Nov 15 17:10:59 2010 kiwamuUpdateGreen LockingPLL with real green signal I
checked the slow servo and the PLL of 80MHz
 FCnoise.png 
  3928   Mon Nov 15 22:24:28 2010 SureshUpdateSUSSelection of MagnetsI have
selected a set of 16 magnets which have a
B field between 900 to 950 Gauss (5% variation)
  
  3929   Tue Nov 16 03:33:22 2010 yutaUpdateIOOaligned Faraday, beam reached SM just before PRM(Koji, Yuta)

 MCalignNov16.png 
  3930   Tue Nov 16 09:02:54 2010 AidanUpdateGreen LockingPID loop - calibration of SR620 output [Aidan, Kiwamu]
Kiwamu and I roughly calibrated the
analogue output from the SR620 frequency
  
  3931   Tue Nov 16 10:47:45 2010 AidanUpdateGreen LockingRebooted c1psl - added new GRNBEAT_FREQ channelI restored C1:PSL-126MOPA_126MON to its
original settings (EGUF = -410, EGUL = 410)
and added a new calc channel called C1:LSC-EX_GRNBEAT_FREQ
  
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