40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log, Page 88 of 344  Not logged in ELOG logo
ID Date Authorup Type Category Subject Text Attachments
  5585   Fri Sep 30 15:22:17 2011 KatrinUpdateGreen LockingWhat happened on green YARM? 
This is a kind
  
  5619   Tue Oct 4 20:34:20 2011 KatrinUpdateGreen Locking7kHz Peak in servo input YARM[Kiwamu, Katrin]
As reported earlier an oscillation
around 7kHz is an the PDH error signal. The
 servoinput.pngservoinput2.png 
  5623   Wed Oct 5 18:31:02 2011 KatrinUpdateGreen LockingExchanged mirror on YARM tableOn the Green YARM end table the second
mirror behind the laser has been exchanged.
Reason: The light is impinging on
  
  5631   Fri Oct 7 17:35:26 2011 KatrinUpdateGreen LockingPower on green YARM tableAfter all realignment is finished, here
are the powers at several positions:
 
 DSC_3496_power.JPG 
  5646   Mon Oct 10 18:53:04 2011 KatrinUpdateGreen LockingMirrors whose angle of incidence is not 45The angle of incidence of light is for
some mirrors on the YARM end table different
from 45° even though the mirrors are
  
  5657   Wed Oct 12 18:54:02 2011 KatrinUpdateGreen Locking60 Hz oscillation due to broken BNC cableThere was a 60 Hz and 120 Hz oscillation
on the green PDH photo diode output. After
a long search, I could identify that
  
  5658   Wed Oct 12 19:58:32 2011 KatrinUpdateGreen LockingPower splitter is unbalancedThe mini circuit power splitter ZFRSC-42S+
used at the YARM has no balanced output as
it should have according to the data sheet.
  
  5661   Thu Oct 13 20:25:32 2011 KatrinUpdateGreen LockingLPF transfer function YARMIt is a 4th order filter with
cut of frequency of 120 kHz.
 
 designLPF.pngLC_LPF.TIF 
  5713   Thu Oct 20 16:33:24 2011 KatrinUpdateGreen LockingTransfer function YARM PDH boxYesterday, I measured the transfer function
of the YARM PDH box.
 PDH_box.pngSCRN0000.pdf 
  5726   Fri Oct 21 16:59:14 2011 KatrinUpdateGreen LockingYARM PDH box brokenI could not improve the locking. So, I
checked the transfer function of the PDH
box again. The transfer function looks okay
  
  5734   Tue Oct 25 11:48:02 2011 KatrinHowToElectronicssolder tiny smd op ampsYesterday, I had the great pleasure to
solder a tiny 4 x 4 mm op amp with 16 legs
(AD8336).
  
  5742   Wed Oct 26 11:35:08 2011 KatrinUpdateGreen LockingYARM PDH box   PDH_w_wo_jump.png 
  5743   Wed Oct 26 20:30:47 2011 KatrinUpdateLSCPOX11 and POP55 installed[Katrin,Jenne]
RF photo diodes POP55 and POX11 are
installed. The beams are aligned to the photo
  
  5769   Mon Oct 31 14:01:56 2011 KatrinUpdateGreen LockingYARM locks for 2hToday, I could lock the YARM laser for
2h to the YARM cavity. After to hours the
output of the servo is saturated. I need
 7x 
  5786   Wed Nov 2 17:29:10 2011 KatrinUpdateCDSc1scy.mdl compiledSlight modification on that model:

    terminated Q_out of Lockins
to be able to compile the old model
  
  5787   Wed Nov 2 17:33:28 2011 KatrinUpdateGreen LockingADC channels for slow controlconnector J9B of hardware ADC --> ch1
in software ADC --> GCY_ERR
connector J14 of hardware ADC -->
  
  5789   Wed Nov 2 20:56:49 2011 KatrinUpdateCDSdigital zeros at C1:X05-MADC0 (c1scy)Channels C1:X05-MADC0_TP_XXX with XXX 2-9,
14-19, 21-27, 29-31 showed digital zeros.
Some of these channels are used in
  
  5790   Wed Nov 2 21:15:06 2011 KatrinUpdateCDSand again c1scy.mdl compiledI changed an ADC channel for GCY_ERR and
thus recompiled the c1scy model.
  
  5791   Wed Nov 2 21:49:59 2011 KatrinUpdateCDSc1iscey computer died againwhile I was not doing anything on the machine.   
  5797   Thu Nov 3 16:43:44 2011 KatrinUpdateGreen LockingSHG temperature (YARM)Plugging in the thermal feedback BNC cable
to the laser reduced the DC voltage of the
green PDH photo diode from 3.12 V to 1.5V
  
  5809   Fri Nov 4 13:53:33 2011 KatrinUpdateGreen LockingSHG temperature (YARM)

    
        
  
  5815   Fri Nov 4 21:15:38 2011 KatrinUpdateGreen LockingNew fiber coupler (YARM)63% coupling efficiency into the new fiber
collimator (Thorlabs XXXX) and the blue fiber.This
should be sufficient for a beat measurement
  
  5837   Mon Nov 7 17:38:18 2011 KatrinUpdateGreen LockingYARM length fluctuation   fluctuation.pngfluctuation_length.pngfluctuation_Hz_length.png 
  5846   Wed Nov 9 12:05:08 2011 KatrinUpdateGreen LockingYARM error signal and feedback signalerror signal = signal measured behind the
low-pass filter
feedback signal = output of the gain
 fluctuation_test.png 
  5872   Fri Nov 11 12:32:45 2011 KatrinUpdateGreen Lockingbeat PSL - YARM laser [Suresh, Katrin]
Measured frequency fluctuation of
the beat between PSL and YARM lasers.
 beat_psl_y.png 
  5874   Fri Nov 11 13:35:19 2011 KatrinUpdateGreen LockingFeedback to ETMY[Kiwamu, Katrin]
 20111111_freq_supp.png 
  12999   Fri May 19 19:18:53 2017 KaustubhSummaryGeneralTesting of the new Photo Detectors ET-3010 and ET-3040Motivation:

I got some hands-on-experience
on using RF photodetectors and the Network
 IMG_20170519_173247922.jpgIMG_20170519_173253252.jpgIMG_20170519_173300174.jpgPD_test_setup.png 
  13005   Mon May 22 18:20:27 2017 KaustubhSummaryGeneralTesting of the new Photo Detectors ET-3010 and ET-3040I am adding the text files with the data
readings and paramater settings along
with the Bode Plot of the data. I plotted
 ET-3040_test.zipET-3040_test.pdf 
  13009   Tue May 23 18:09:18 2017 KaustubhConfigurationGeneralTesting ET-3010 PDIn continuation with the previous(ET-3040
PD) test.

The ET-3010 PD requires to be fiber
  
  13011   Wed May 24 18:19:15 2017 KaustubhUpdateGeneralET-3010 PD TestSummary:

In continuation to the previous
test conducted on the ET-3040 PD,  I
 PD_test_setup.pngET-3010_test.pdfET-3010_test.zip 
  13016   Sat May 27 10:26:28 2017 KaustubhUpdateGeneralTransimpedance CalibrationUsing Alberto's paper LIGO-T10002-09-R
titled "40m RF PDs Upgrade", I
calibrated the vertical axis in the bode
 ET-3040_test_transimpedance.pdfET-3010_test_transimpedance.pdfFormula_for_Transimpedance.pdf 
  13077   Fri Jun 23 02:43:43 2017 KaustubhHowToComputer Scripts / ProgramsTaking Measurements From AG4395ASummary:

I have written a code(a basic one
which needs a lot of improvements, but still
 Test_Files_and_Code.zipBode_Plot_with_Error_Bands.pdf 
  13078   Fri Jun 23 02:55:18 2017 KaustubhUpdateComputer Scripts / ProgramsScript RunningI am leaving a script running on the Pianoso
for the night. For this purpose, even
the AG4395A is kept on. I'll see the
  
  13086   Thu Jun 29 00:13:08 2017 KaustubhUpdateComputer Scripts / ProgramsTransfer Function TestingIn continuation to my previous posts, I
have been working on evaluating the data
on transfer function. Recently, I have calculated
 Correlation_Plot.pdf2x100_Test_Files_and_Code_and_Correlation_Files.zip 
  13109   Mon Jul 10 21:31:15 2017 KaustubhHowToComputer Scripts / ProgramsDetails on Cavity Scan AnalysisSummary:

The
following elog describes the procedure followed
 Attachments.zip 
  13116   Thu Jul 13 16:10:34 2017 KaustubhSummaryComputer Scripts / ProgramsCavity Scan Simulation CodeThe code
to produce a cavity scan simulation and then
fitting the data and re-evaluating the initiallt
  
  13065   Thu Jun 15 14:24:48 2017 Kaustubh, JigyasaUpdateComputersOttavia Switched OnToday, I and Jigyasa connected the Ottavia
to one of the unused monitor screens Donatella.
The Ottavia CPU had a label saying 'SMOKED''.
  
  13067   Thu Jun 15 19:49:03 2017 Kaustubh, JigyasaUpdateComputersOttavia Switched OnIt has been working fine the whole day(we
didn't do much testing on it though).
We are leaving it on for the night.
  
  13068   Fri Jun 16 12:37:47 2017 Kaustubh, JigyasaUpdateComputersOttavia Switched OnOttavia had been left running overnight
and it seems to work fine. There has been
no smell or any noticeable problems in the
  
  13071   Fri Jun 16 23:27:19 2017 Kaustubh, JigyasaUpdateComputersOttavia Connected to the Netgear BoxI just connected the Ottavia to the Netgear
box and its working just fine. It'll
remain switched on over the weekend.
  
  5273   Sat Aug 20 00:42:22 2011 KeikoUpdateLSCTolerance of PRC, SRC, MICH length = 2 mm ? 
  
  5292   Tue Aug 23 17:51:37 2011 KeikoUpdateLSCTolerance of PRC, SRC, MICH length = 2 mm ?Keiko,
Kiwamu
We noticed that we have used wrong
  
  5334   Fri Sep 2 04:41:35 2011 KeikoUpdateLSCTolerance of PRC, SRC, MICH length = 5 mm ? Keiko,
Kiwamu
 MATRIX.pngdphase.png 
  5377   Sat Sep 10 14:55:28 2011 KeikoUpdateLSC3f demodulation board check To
check the demodulation boards for REFL33
and REFL165, a long cable from ETMY (SUS-ETMY-SDCOIL-EXT
  
  5378   Sat Sep 10 16:10:42 2011 KeikoUpdateLSC3f demodulation board checkThere is a LP filter just after the RF
input of an demodulation board (its schematic
can be found as D990511-00-C on DCC). I have
 REFL33-input-filter.png 
  5380   Sat Sep 10 18:57:52 2011 KeikoUpdateLSC3f demodulation board checkThe
phase delay due to the RF input filter on
the demodulation board will not bother the
  
  5385   Sun Sep 11 22:36:32 2011 KeikoUpdateLSC3f demodulation board checkFilters
at the RF inputs of REFL33 and REFL165 demodulation
boards were measured again. The filters will
 REFL33.pngREFL165.png 
  5386   Mon Sep 12 13:24:07 2011 KeikoUpdateLSC3f demodulation board checkI also quickly
checked the orthogonality of the demodulation
board for REFL33 and REFL165 using function generators
  
  5387   Mon Sep 12 16:27:01 2011 KeikoUpdateLSC3f demodulation board checkWait. I am checking the whitening filters
of the 33 and 165 demodulation boards.
Also, 
  
  5388   Mon Sep 12 18:40:35 2011 KeikoUpdateLSC3f demodulation board checkLSC-REFL33-I-IN1(IN2, OUT) and   
ELOG V3.1.3-