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ID Date Author Type Categoryup Subject Text Attachments
  5039   Wed Jul 27 01:57:28 2011 SonaliUpdateGreen LockingWeekly Summary1. I have used the PMC  trans beam
in my set-up as the required PSL beam.
2. I have superposed the ETMX-Fibre
  
  5052   Thu Jul 28 13:51:00 2011 SonaliUpdateGreen LockingZHL-32A-S.Initially I was using RFPD-1611to get the
IR beat frequency. Its gain was not very
high, so I was getting a very low signal
  
  5066   Sat Jul 30 05:11:45 2011 SureshUpdateGreen LockingY- end table clean-upThe optics on the Y-end table which required
to be moved have been repositioned. 
 Y-end_table_work.png 
  5084   Mon Aug 1 20:21:05 2011 kiwamuUpdateGreen LockingY arm green beam axis : alignedThe beam
axis of the Y green light has been aligned.
  
  5088   Tue Aug 2 02:20:09 2011 kiwamuUpdateGreen LockingY arm green beam axis : doneI
succeeded in locking the green light to the
Y arm cavity, 
  
  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


   
        
            
  
  5181   Thu Aug 11 02:16:57 2011 JenneUpdateGreen LockingY-green aligned and flashing[Jenne, with ample supervision by Kiwamu
and Suresh]
Y-green was aligned, and is now flashing. 
  
  5328   Wed Aug 31 11:37:56 2011 steveUpdateGreen Lockingshutter in place at east endUniblitz mechanical shutter installed in
the green beam path at ETMY-ISCT  The
remote control cable has not been connected.
  
  5470   Mon Sep 19 21:19:25 2011 KatrinUpdateGreen LockingBroadband photodiode characterizationAnother Hamasutu S3399 photodiode was tested
with the electronic circuit as described
in LIGO-D-1002969-v.
 current_noise_S3399.pdfidet_S3399.pdfS3399_response.pdfcurrent_noise_S3399_v2.pdfidet_S3399_v2.pdf 
  5511   Thu Sep 22 01:05:28 2011 KatrinUpdateGreen LockingNew modulation frequency (Y arm)[Kiwamu / Katrin]
 
On Wednesday, the green light was
  
  5531   Fri Sep 23 17:31:14 2011 KatrinUpdateGreen LockingStray light reduction (Y)I inserted several beam blocks and iris
on the Y arm Green table. There was/is lots
of stray light because a lot of the mirrors
  
  5585   Fri Sep 30 15:22:17 2011 KatrinUpdateGreen LockingWhat happened on green YARM? 
This is a kind
  
  5586   Fri Sep 30 16:17:10 2011 kiwamuUpdateGreen Lockingthings to be done for the Yarm green lockThank you for the summary.
I
think now you are getting into a phase where
  
  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
  
  5625   Thu Oct 6 15:37:26 2011 JenneUpdateGreen LockingY-green Mech Shutter Button[Katrin, Jenne]
We were poking around and tried to
make a button for the Y-green shutter, just
  
  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 
  5701   Wed Oct 19 16:28:35 2011 steveUpdateGreen LockingETMY mechanical shutter is working


   
        
            
  
  5704   Wed Oct 19 17:33:07 2011 kiwamuUpdateGreen LockingETMY mechanical shutter : fully functional
The mechanical
shutter on the Y end is now fully functional.
 MechShutter.png 
  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
  
  5742   Wed Oct 26 11:35:08 2011 KatrinUpdateGreen LockingYARM PDH box   PDH_w_wo_jump.png 
  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 
  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 -->
  
  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
  
  5798   Thu Nov 3 17:04:23 2011 KojiUpdateGreen LockingSHG temperature (YARM)Changing the crystal temperature changes
the laser frequency. This will causes the
beat note missing at the vertex.
  
  5800   Thu Nov 3 17:24:59 2011 ZachUpdateGreen LockingSHG temperature (YARM)I must confess that I changed the temperature
of the laser via the dial yesterday. I believe
the initial (displayed) temperature was ~19o,
  
  5807   Fri Nov 4 13:04:50 2011 ZachUpdateGreen LockingPassive summing box modificationsI spent some time the other day trying
to diagnose the problem with the Y Arm universal
PDH box (S/N 17), which Katrin
 sum_circuit_new.pngsumbox_TFs.png 
  5808   Fri Nov 4 13:13:25 2011 ZachUpdateGreen LockingPDH box #17 modified, tooI also modified the Y-Arm PDH box itself
slightly. Previously, there was a flying
10k resistor from the SWEEP input to TP2.
  
  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
  
  5820   Sat Nov 5 04:30:21 2011 kiwamuUpdateGreen LockingRe:Passive summing box modificationsI think you also should check the PZT's
capacitance of the 700mW LightWave because
2.36 nF is the one for the 1W Innolight laser.
  
  5837   Mon Nov 7 17:38:18 2011 KatrinUpdateGreen LockingYARM length fluctuation   fluctuation.pngfluctuation_length.pngfluctuation_Hz_length.png 
  5838   Mon Nov 7 22:20:18 2011 kiwamuUpdateGreen LockingRe:YARM length fluctuationA nice plot !
Can you put another y-axis on the
right hand side of the same plot  in
  
  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 
  5852   Wed Nov 9 16:49:17 2011 kiwamuUpdateGreen LockingY end laser temperature with slow input connectedIndeed it is strange. I took a quick look
at it.
In
  
  5860   Thu Nov 10 05:54:23 2011 kiwamuUpdateGreen LockingBeat-note detected : PSL vs Y arm[Katrin / Kiwamu]
The beat-note
 DSC_3606_small.jpg 
  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 
  5888   Mon Nov 14 17:01:14 2011 kiwamuUpdateGreen LockingALS feedback on MC2Leaving a note on the ALS feedback before
I forget:
The
  
  5890   Mon Nov 14 22:56:31 2011 kiwamuUpdateGreen LockingY end PDH lock : UGF at 17 kHz[Tomotada / Kiwamu]
 
The open loop transfer function of the Y
 YendOLTF.png 
  5893   Tue Nov 15 09:51:04 2011 ZachUpdateGreen LockingY end PDH lock : UGF at 17 kHz

    

       
            
  
  5894   Tue Nov 15 12:25:38 2011 kiwamuUpdateGreen LockingY arm ALS : beat-note free run fluctuationLocking activity last night :
 
The free run beat-note in 532 nm has been
 noise_budget.png 
  5914   Wed Nov 16 17:29:46 2011 kiwamuUpdateGreen LockingSome updates on the Y end green PDH
    

       
            
 Yarm_fluctuation.png 
  5920   Thu Nov 17 03:46:52 2011 kiwamuUpdateGreen LockingPSL doubling had been diabledI
found that the temperature controller of
the PSL doubling oven had been disabled.
  
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