 Wed Aug 27 23:13:13 2014, Koji, Optics, Characterization, Collection of the power budgetting info
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L1 OMC Cavity power budget
H1 OMC Cavity power budget
3IFO OMC Cavity power budget |
 Tue Sep 9 20:59:19 2014, Koji, Mechanics, Characterization, Structural mode analysis for the PZT mirror 6x
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Structural analysis of the PZT mirror with COMSOL.
Inline figures: Eigenmodes which involves large motion of the tombstone. In deed 10kHz mode is not the resonance of the PZT-mirror joint,
but the resonance of the tombstone. |
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Sat Jan 17 11:40:04 2015, Koji, General, General, 3rd OMC completed
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Jan 15, 2015 3rd OMC completed
The face caps of the DCPD/QPD cables were installed (Helicoils inserted)
PD7&10 swapped with PD11(for DCPD T) and PD12(DCPD R). |
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Fri Jan 30 19:31:08 2015, Koji, General, General, Item lending
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Gabriele:
PZT HV Amp
Evan: |
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Tue Feb 3 18:23:49 2015, Koji, General, General, Item lending
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- The laser was removed and shipped to LHO today.
- UV illuminator / fused silica fiber light guide / UV power meter / UV face shield (Qty 2) will be shipped to MIT.
They are CIT properties except for the illuminator. |
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Wed Feb 4 20:07:24 2015, Koji, General, General, Item lending
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Shipment to MIT (L. Barsotti, J. Miller)
1. UV Illuminator (LESCO Super Spot MK III)
2. UV Power meter (American Ultraviolet AIB1001) Caltech property C30140 |
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Wed Feb 18 21:51:23 2015, Koji, General, General, Notes on OMC Transportation Fixtures & Pelican
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LLO has one empty OMC transportation fixture.
LHO has one empty OMC transportation fixture.
LHO has one OMC transportation fixture with 3IFO OMC in it. |
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Wed Jul 15 22:23:17 2015, Koji, Electronics, AM Stabilized EOM Driver, E1400445 first look
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This is not an OMC related and even not happening in the OMC lab (happening at the 40m), but I needed somewhere to elog...
E1400445 first look
LIGO
DCC E1400445 |
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Sat Jul 18 11:37:21 2015, Koji, Electronics, AM Stabilized EOM Driver, D0900848 power board ~ oscillation issue solved 6x
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Power Supply Board D0900848 was oscillating. Here is the procedure how the issue was fixed.
PCB schematic: LIGO DCC D0900848
0. Extracting the power board. |
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Tue Jul 21 20:20:12 2015, Koji, General, General, Item lending
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Kate (ATF)
- 4ch color oscilloscope (Tektronix)
- Chopper controller |
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Wed Jul 22 09:43:01 2015, Koji, Electronics, AM Stabilized EOM Driver, Power supply test of the EOM/AOM Driver
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Serial Number of the unit: S1500117
Tester: Koji Arai
Test Date: Jul 22, 2015 |
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Wed Jul 22 10:15:14 2015, Koji, Electronics, AM Stabilized EOM Driver, RF test of the EOM/AOM Driver S1500117
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7) Make sure the on/off RF button works,
=> OK
8) Make sure the power output doesn't oscillate, |
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Sat Jul 25 17:24:11 2015, Koji, Electronics, AM Stabilized EOM Driver, RF test of the EOM/AOM Driver S1500117 7x
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(Calibration for Attachment 5 corrected Aug 27, 2015)
Now the test procedure fo the unit is written in the document https://dcc.ligo.org/LIGO-T1500404
And the test result of the first unit (S1500117) has also been uploaded to DCC https://dcc.ligo.org/LIGO-S1500117 |
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Tue Jul 28 18:36:50 2015, Koji, Electronics, AM Stabilized EOM Driver, RF test of the EOM/AOM Driver S1500117
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Final Test Result of S1500117: https://dcc.ligo.org/LIGO-S1500117
After some staring the schematic and checking some TFs, I found that the DAQ channels for MON2 have a mistake in the circuit.
Differential driver U14 and U15 of D0900848 are intended to have the gain of +10 and -10 for the pos and neg outputs. |
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Mon Aug 10 02:11:47 2015, Koji, Electronics, AM Stabilized EOM Driver, RF AM Measurement Unit E1500151
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This is an entry for the work on Aug 3rd.
LIGO DCC E1500151
Power supply check |
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Mon Aug 10 11:39:40 2015, Koji, Electronics, AM Stabilized EOM Driver, RF AM Measurement Unit E1500151
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Entry for Aug 6th, 2015
I faced with difficulties to operate the RF AM detectors.
I tried to operate the RF AM detector. In short I could not as I could not remove the saturation of the MON outputs, no matter how jiggle the |
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Mon Aug 10 11:57:17 2015, Koji, Electronics, AM Stabilized EOM Driver, RF AM Measurement Unit E1500151
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Spending some days to figure out how to program CPLD (Xilinx CoolRunner II XC2C384).
I learned that the JTAG cable which Daniel sent to me (Altium JTAG USB adapter) was not compatible with Xilinx ISE's iMPACT.
I need to use Altium to program the CPLD. However I'm stuck there. Altium recognizes the JTAG cable but does not see CPLD. (Attachment 1) |
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Mon Aug 10 12:09:49 2015, Koji, Electronics, AM Stabilized EOM Driver, RF AM Measurement Unit E1500151
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Still suffering from a power supply issue!
I have been tracking the issues I'm having with the RF AM detector board.
I found that the -5V test point did not show -5V but ~+5V! It seemed that this pin was not connected to |
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Thu Aug 20 01:35:01 2015, Koji, Electronics, General, OMC DCPD in-vacuum electronics chain test
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We wanted to know the transimpedance of the OMC DCPD at high frequency (1M~10M).
For this purpose, the OMC DCPD chain was built at the 40m. The measurement setup is shown in Attachment 1.
- As the preamp box has the differential output (pin1 and pin6 of the last DB9), pomona clips were used to measure the transfer functions |
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Wed Aug 26 11:31:33 2015, Koji, Electronics, General, OMC DCPD in-vacuum electronics chain test
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| The noise levels of the output pins (pin1/pin6) are measured. Note that the measurement is done with SE. i.e. There was no common mode noise rejection. |
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Fri Aug 28 01:08:14 2015, Koji, Electronics, AM Stabilized EOM Driver, RF AM Measurement Unit E1500151 ~ Calibration
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Worked on the calibration of the RF AM Measurement Unit.
The calibration concept is as follows:
Generate AM modulated RF output
Measure sideband amplitude using a network anayzer (HP4395A). This gives us the SSB |
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Fri Aug 28 02:14:53 2015, Koji, Electronics, AM Stabilized EOM Driver, RF AM Measurement Unit E1500151 ~ 37MHz OCXO AM measurement
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In order to check the noise level of the RFAM detector, the power and cross spectra for the same signal source
were simultaneously measured with the two RFAM detectors.
As a signal source, 37MHz OCXO using a wenzel oscillator was used. The output from the signal source |
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Sun Sep 6 16:50:51 2015, Koji, Electronics, General, Unit test of the EOM/AOM Driver S1500118
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TEST Result: S1500118
Additional notes
- Checked the power supply. All voltages look quiet and stationary. |
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Tue Sep 8 10:55:31 2015, Koji, Electronics, AM Stabilized EOM Driver, RF AM Measurement Unit E1500151 ~ 37MHz OCXO AM measurement
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Test sheet: https://dcc.ligo.org/LIGO-E1400445
Test Result (S1500114): https://dcc.ligo.org/S1500114 |
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Tue Sep 8 11:18:10 2015, Koji, Optics, Characterization, PBS Transmission measurement
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Motivation: Characterize the loss of the Calcite Brewster PBS.
Setup: (Attachment 1)
- The beam polarization is rotated by an HWP |
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Wed Sep 9 01:58:34 2015, Koji, Optics, Characterization, PBS Transmission measurement
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Calcite Brewster PBS Continued
The transmission loss of the Calcite brewster PBS (eLIGO squeezer OFI) was measured with different conditions.
The measured loss was 3600+/-200ppm. (i.e. 900+/-50 ppm per surface) |
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Thu Sep 10 04:03:42 2015, Koji, Optics, Characterization, More polarizer optics measurement (Summary)
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Brewster calcite PBS (eLIGO Squeezer OFI)
Loss L = 3600 +/- 200ppm
Angular dependence: Attachment 1 |
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Wed Sep 23 17:49:50 2015, Koji, Optics, Characterization, More polarizer optics measurement (Summary)
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For the Glasgow PBS, the measurement has been repeated with different size of beams.
In each case, the PBS crystal was located at around the waist of the beam.
Otherwise, the measurement has been done with the same way as the previous entries. |
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Tue Dec 15 13:38:34 2015, Koji, Electronics, Characterization, EOM Driver linearity check
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Linearity of the EOM driver was tested. This test has been done on Nov 10, 2015.
- Attachment 1: Output power vs requested power. The output start to deviate from the request above 22dBm request.
- Attachment 2: Ctrl and Bias voltages vs requested power. This bias was measured with the out-of-loop channel. |
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Tue Dec 15 13:39:13 2015, Koji, Electronics, Characterization, Phase noise measurement of aLIGO EOM drivers
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This measurement has been done on Dec 1st, 2015.
The phase noise added by the EOM driver was tested.
The test setup is depicted in the attached PDF. The phase of the RF detector was set so that the output is close to zero crossing as much as |
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Tue Dec 15 13:42:37 2015, Koji, Optics, Characterization, Dimensions / packaging of HQE PDs
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The dimensions of a high QE PDs was measured as well as the ones for C30665. (Attachment 4, Unit in mm)
They seemed to be very much compatible.
The PDs came with the designated case (Attachment 1). The bottom of the case has a spongy (presumably |
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Fri Dec 18 15:33:24 2015, Koji, General, Loan / Lending, Loan from Rich
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Loan Record: I borrowed a PD can opener from Rich => Antonio Returned Sep 9, 2016
Tungsten Carbide Engraver (permanently given to the OMC lab)
KEITHLEY SOURCE METER + Laptop |
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Tue Dec 29 12:15:46 2015, Koji, General, General, Glasgow polarizer passed to Kate
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| The Glasgow polarizer was passed to Kate on Dec 17, 2015. |
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Thu Feb 18 21:08:32 2016, Koji, General, Loan / Lending, (all returned) Antonio loan
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| Antonio borrowed: Rich's PD cutter (returned), Ohir power meter(returned), Thorlabs power meter head, Chopper |
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Sat Feb 20 19:11:22 2016, Koji, Electronics, Characterization, Dark current measurement of the HQE PD and other PDs
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Dark current of the HQE PD and other PDs were measured.
- The HQE PDs were loaded on the new PD transportation cages (Attachment 1)
The PDs are always shorted by a clean PD plugs. The PD element is still capped with Kapton seals. |
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Sun Mar 6 02:13:28 2016, Koji, Optics, Characterization, PD glass reflections
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On friday, I removed a glass cover of a G30655 with a PD can cutter.
When a beam shoots a Perkin Elmer/Excelitas PD, we usually observe three reflections.
We always wonder what these are. |
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Sun Mar 13 21:22:27 2016, Koji, Electronics, Characterization, Dark current measurement of the HQE PD and other PDs
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Transfered for RGA scan
B4 (C1-05) -> F1
C1 (C1-07) -> F2 |
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Sun Mar 13 22:02:09 2016, Koji, Optics, Characterization, HQEPD QE measurement (direct comaprison)
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Direct comparison of the PD responsibities
We can expect 5% increase of the QE with the new PD.
P-pol 10deg incident |
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Sat Mar 26 01:49:48 2016, Koji, Optics, Characterization, HQEPD QE
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Calibration of the transimpedance
Use KEITHLEY 2450 as a calibrated current source. Model 2450 has the current source accuracy of 0.020%+1.5uA at 10mA range. For 6mA current output,
the error is 3uA (0.05%). |
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Sat Mar 26 17:39:50 2016, Koji, Electronics, Characterization, HQEPD dark noise
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Dark noise measurement for 6 HQEPDs and 1 C30665. All of these showed sufficiently low dark current noise levels compared with the noise level of the
DCPD preamp. The measurement was limited by the input noise (ADC) noise of the FFT analyzer as the line noises were too big.
The measurement has been done with the transimpedance of 1e7. The bandwidth of the measurement was 50kHz. |
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Sat Mar 26 18:22:24 2016, Koji, Electronics, Characterization, Baking / Contamination tests of the PDs
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For the production of the aLIGO PDs, the following transfer of the PDs were carried out
A1-23 Cage A1 -> G1
A1-25 Cage A2 -> G2 |
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Tue Apr 5 18:14:55 2016, Koji, General, Loan / Lending, QPD Lending Crackle
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Xiaoyue
QPD head
X-Z stage |
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Tue Apr 5 18:22:40 2016, Koji, Electronics, Characterization, Baking / Contamination tests of the PDs
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Possible reduction of the QE was observed after air-bake at 75degC.
Yesterday I received Cage G from Bob for intermediate test of the PD performance after air bake but before vacuum bake.
This cage was prepared to be the production pair. |
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Tue Apr 5 21:20:15 2016, Koji, Electronics, Characterization, More dark noise measurement
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| All survived PDs have been measured. |
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Fri Jun 10 17:12:57 2016, Koji, General, Configuration, L1 OMC DCPD replacement
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New DCPD(T) = A1-23
DCPD(T) = DCPDB: extracted and accomodated in CAGE-G SLOT1
New DCPD(R) = A1-25 |
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Fri Jul 22 22:24:05 2016, Koji, General, General, HQEPD inventory
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As of Jul 22, 2016
As of Aug 11, 2016
As of Aug 16, 2016 |
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Fri Aug 12 14:58:17 2016, Koji, General, Configuration, H1 OMC DCPD replacement
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Preparation of 3rd OMC for the use in H1
New DCPD(T) = B1-01
DCPD(T) = DCPDA: extracted and accomodated in CAGE-A SLOT1 |
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Mon Aug 15 10:09:10 2016, Koji, General, General, Prev H1 OMC shipped to CIT
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Previous H1 OMC shipped from LHO to CIT
https://ics-redux.ligo-la.caltech.edu/JIRA/browse/Shipment-8196 |
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Mon Aug 22 12:58:16 2016, Koji, General, General, UV bond samples -> Garilynn
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- FS base + Mounting Prism
- FS or SF2 1/2" piece + FS or SF2 1/2" piece
- FS? plate + FS or SF2 1/2" piece + FS or SF2 1/2" piece + FS? plate |
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Tue Aug 23 23:36:54 2016, Koji, Optics, Characterization, Inspection of the damaged CM1 (prev H1OMC) 7x
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1. Calum and GariLynn checking the CM1 defect from the front side.
2. Same as above
3. Close up of the defect |