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ID Date Author Type Categoryup Subject Text Attachments
  4532   Fri Apr 15 13:43:23 2011 BryanConfigurationGreen LockingI leave you with these messages...Y-end PDH electronics.  Y_End_Electronics_TF.png 
  4534   Fri Apr 15 22:54:20 2011 Aidan, BryanUpdateGreen LockingBeat note amplitude on Vertex PDI was investigating the beat note amplitude
on the vertex PD again yesterday. The incident
power on the PD was 150uW in the PSL green
  
  4584   Thu Apr 28 22:38:38 2011 AidanUpdateGreen LockingElectronics schematic for vertex beatbox With some assistance from Kiwamu
and Koji, I've drawn up the electronics design
for the Beat Box for the vertex green locking.
 Canvas_1.pngCanvas_2.png 
  4593   Sat Apr 30 05:14:33 2011 KojiUpdateGreen LockingElectronics schematic for vertex beatbox- AC coupling for the comparator
circuit of the green locking
In order to relieve the power consumption
 freq_divider.png 
  4846   Tue Jun 21 00:38:21 2011 SonaliUpdateGreen Lockingrepositioned "QPDY_PD"1.The aim is the laser frequency stabilisation
of PSL and AUX.
2.As a first step we want to couple
 ETMY_table_2011_June20.pngETMY_table_change1.jpg 
  4849   Tue Jun 21 19:54:33 2011 SureshUpdateGreen LockingLightWave NPRO power supply shifted to ETMY end tableThe Lightwave NPRO power supply which
is being shared between the AS table and
the ETMY table has been shifted back to the
  
  4852   Wed Jun 22 01:59:43 2011 SonaliUpdateGreen Lockingfibre-coupling of the IR beam  What
I did today.
1. Collimation of a beam.
 ETMY_june_21.jpgcollimation_700nm_21_june.JPG 
  4862   Thu Jun 23 02:12:12 2011 SonaliUpdateGreen Lockingwork schedule. June 22-June 24:
1.Coupling
light into fibre at the ETMY.
  
  4882   Sat Jun 25 00:00:28 2011 SonaliUpdateGreen LockingFibre Coupling. What I did today.
1. I tried to align the IR input
beam by aligning the two mirrors, to couple
 Fibre_coupling_successful_24_june.jpgBeam_output_on_screen.jpg 
  4901   Tue Jun 28 16:52:37 2011 SonaliUpdateGreen LockingRouting of fibre to PSL complete.1. Suresh and I completed the alignment
of the fibre and the three mirrors on the
ETMY table.
 coupled_fibre.jpgthe_fibre_route.jpgETMY_aftr_fibre_coupling2.png 
  4958   Fri Jul 8 20:50:49 2011 sonaliUpdateGreen LockingPower of the AUX laser increased.The ETMY laser was operating at 1.5 A current
and 197 mW power.
For the efficient frequency doubling
 Graph3.pngETMY_beam_powers.png 
  4965   Thu Jul 14 02:32:11 2011 sonaliUpdateGreen LockingPower of the AUX laser increased.

    

       
            
  
  4973   Fri Jul 15 13:48:56 2011 sonaliUpdateGreen LockingPower of the AUX laser increased.

    

       
            
 ETMY_after_fibre_coupling_labelled.pdf 
  4977   Fri Jul 15 17:42:21 2011 SonaliUpdateGreen LockingPSL layout for superposition of the PSL,ETMX and ETMY beams.The fibres carrying the beams from the
ETMX as well as the ETMY have been routed
to the PSL table now.
 PSL_change1.pdfPSLnewspace1.pdf 
  4994   Wed Jul 20 06:17:04 2011 SureshUpdateGreen LockingY-end green laser power issuesThe Y-end green beam power is 0.47 mW.
While
aligning the Y-end aux laser light into the
fiber we noticed that the green power out
 Y-end_table_powers.pdfY-end_table.png 
  4997   Wed Jul 20 10:10:19 2011 SonaliUpdateGreen LockingWeekly summary I finished wih the set-up at the
ETMY table. Instead of the neutral Density
Filter , I put in a mirror(Y1-1037-45S)  which
  
  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.
  
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