 Fri May 26 21:53:20 2017, Koji, General, Configuration, Trans RF PD setup
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Recent work
- DC output of the trans RF PD was connected to the BNC patch panel. => Now CH4 of the scope is monitoring this signal
- The RF sweep signal from the network analyzer is connected to the power combiner for the EOM drive via the SMA patch panel. |
 Tue Jun 6 00:49:48 2017, Koji, General, Configuration, Trans RF PD setup
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Last week, I further worked on the RF system to install 20dB coupler on the agilent unit and setup the R channel. This allowed me to make the FSR/TMS
measurement of the OMC.
And today several optical improvement has been done. |
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Tue Jun 6 22:00:36 2017, Koji, General, Configuration, Trans RF PD setup
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- Replaced the PZT with the one used from the beginning. This must be PZT #21. After the replacement, the spot positions look very good. I even went
up. So I decided this is the configuration to proceed to the gluing. The CM1 mirror has the HR arrow at the top.
- The input beam was realigned w.r.t. the OMC. |
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Tue May 16 19:05:18 2017, Koji, Optics, Configuration, OMC SN002 fix - temporary optics
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| Working on the SN002 OMC fix. Checked the inventory. I think I am using C8 mirror as the new temporary CM1 and PZT24 as the new temporary CM2. |
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Thu Jan 19 20:57:53 2017, Koji, Supply, General, Purchase
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Ordered:
Office Depot
v AA battery Qty. 24 |
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Thu Feb 16 17:23:12 2017, Koji, Supply, General, Purchase
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BNC Patch Panel
8x Amphenol Connex 112443 / Isolated BNC FEMALE TO FEMALE BULKHEAD ISOLATED ADAPTER - 50 ohm
http://www.newark.com/amphenol-rf/112443/bulkhead-adapter-bnc-jack-bnc/dp/99H4399
Hole
Diameter: 13mm (0.512") D width 12.10mm (0.477")
4x Amphenol RF 31-4803-75 (75Ohm)
http://www.newark.com/amphenol-rf/31-4803-75/bulkhead-adapter-bnc-jack-bnc/dp/50B8959
same |
Wed Dec 7 21:18:35 2016, Koji, General, General, OMC placed on the table / the beam roughly aligned 
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The OMC mode matching sled was fixed on the nominal part of the table. Then the OMC was located at the nominal position marked by three poles.
The input periscope was adjusted to have the input beam roughtly centered on the OMC QPDs. This made the beam from FM2 aligned to the missing
CM1, and the beam just went through the hole of the mounting prism. Very promising! |
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Thu Dec 8 21:17:09 2016, Koji, General, General, OMC placed on the table / the beam roughly aligned
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The OMC cavity was locked. The alignment was precisely adjusted. The mode matching was optimized by the lens positions. The reflection during the lock
is ~0.01 compared to the full reflection on non-resonance, meaning the mode matching is ~99%. The error signal was maximized (i.e. demod pahse was adjusted)
by sweeping the modulation frequency. Note that the EOM is broad band. The modulation freq chosen today was 34.6MHz. |
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Mon Nov 21 21:19:20 2016, Koji, Optics, General, LWE NPRO Laser / Input Optics / Fiber Coupling
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- About 1.5 month ago, an 700mW LWE NPRO has been brought to OMC Lab.
- The SOP can be found here.
- The base was made for the beam elevation of 3" height. Four 1" pedestals were attached to rise the beam elevation to 4". |
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Wed Dec 7 19:18:10 2016, Koji, Optics, General, LWE NPRO Laser / Input Optics / Fiber Coupling
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FIber Input Mount 132deg
Fiber output mount 275deg
-> 525mW P: 517mW S: 8mW extinction ratio: 0.016 |
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Fri Sep 9 19:43:32 2016, Koji, Optics, General, D1102211 OMC Diode Mount Glass Block went to Downs
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| D1102211 OMC Diode Mount Glass Block (11pcs) have been given to Calum@Downs |
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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 |
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Thu Aug 25 02:17:09 2016, Koji, Optics, Characterization, Inspection of the damaged CM1 (prev H1OMC)
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Initial inspection results by Calum, et al.
https://dcc.ligo.org/LIGO-E1600268 |
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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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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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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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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 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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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 18:22:40 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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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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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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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 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 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 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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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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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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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 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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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 13:38:34 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 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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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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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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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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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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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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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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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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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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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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Mon Jul 21 01:02:43 2014, Koji, Mechanics, Characterization, Some structual mode analysis 6x
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Prisms
Fundamental: 12.3kHz Secondary: 16.9kHz
|
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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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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 |
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Tue Aug 5 13:03:25 2014, Koji, General, General, Missing cable components
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DCPD Connector Face: Qty2 https://dcc.ligo.org/LIGO-D1201276
QPD Connector Face: Qty2 https://dcc.ligo.org/LIGO-D1201282
PD faster: 92210A07 Qty 4: MCMASTER #2-56 x .25 FHCS |
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Mon Aug 4 18:59:50 2014, Koji, General, General, A memorandom
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On breadboarfd cabling for 3IFO OMC
D1300371 - S1301806
D1300372 - S1301808 |
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Sun Jul 20 17:20:39 2014, Koji, General, General, The 3rd (LIO) OMC was shipped out to LHO
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The 3rd (LIO) OMC was shipped out to LHO on Friday (Jul 18) Morning.
At LHO
- All of the on-breadboard cables should be attached and tied down. |
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Thu Jul 17 02:19:20 2014, Koji, Mechanics, Characterization, I1OMC vibration test 6x
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Summary
- The breadboard has a resonance at 1.2kHz. The resonant freq may be chagned depending on the additional mass and the boundary condition.
- There is no forest of resonances at around 1kHz. A couple of resonances It mainly starts at 5kHz. |
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Sun Jul 20 17:19:50 2014, Koji, Mechanics, Characterization, I1OMC vibration test ~ 2nd round 9x
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Improved vibration measurement of the OMC
Improvement
- Added some vibration isolation. Four 1/2" rubber legs were added between the OMC bread board and the transport fixture (via Al foils). |
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Sun Jul 13 17:46:28 2014, Koji, Optics, Characterization, OMC backscatter measurement
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Backscattering reflectivity of the 3rdOMC was measured.
Attached: Measurement setup
1) A CVI 45P 50:50 BS was inserted in the input beam path. This BS was tilted from the nominal 45 deg so that the reflection of the input beam |
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Tue Jul 15 03:00:42 2014, Koji, Optics, Characterization, OMC backscatter measurement
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Presence of the misaligned SRM (T=20%) was forgotten in the previous entry.
This effectively reduces the OMC reflectivity by factor of 25.
This is now reflected in the original entry. Also the argument about the power spectram density was modified. |
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Tue Jul 15 03:34:16 2014, Koji, Optics, Characterization, OMC backscatter measurement
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Backscatter measurement ~ 2nd round
Summary
- The backscatter reflectivity of the 3rd OMC is 0.71 ppm |
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Fri Jul 11 00:06:33 2014, Koji, Optics, Characterization, I1OMC PD
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DCPD# DCPD1 DCPD2
Housing# #009 #010
Diode# #07 #10 |
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Thu Jul 10 23:22:28 2014, Koji, Optics, Characterization, I1OMC QPD
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QPD# QPD1 QPD2
Housing# #006 #007
Diode# #50 #51 |
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Mon Jul 7 01:36:03 2014, Koji, General, General, To Do
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Optical tests
Cleaning
Power Budget
FSR measurement
TMS
measurement
TMS measurement (with DC voltage on PZTs)
PZT DC response
PZT AC response
|
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Thu Jul 10 08:34:57 2014, Koji, General, General, To Do
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Optical tests
Cleaning
Power Budget
FSR measurement
TMS
measurement
TMS measurement (with DC voltage on PZTs)
PZT DC response
|
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Thu Jul 10 01:39:38 2014, Koji, Electronics, General, PZT wire
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Rich came to the OMC lab. Pins for the mighty mouse connector were crimped on the 4 PZT wires.
We found the male 4pin mighty mouse connector in the C&B area.
The cable inventory was checked with ICS/DCC combo. It turned out that most of the on-board cables |
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Tue Jul 8 18:54:54 2014, Koji, Mechanics, Characterization, PZT characterization
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Each PZT was swept with 0-150V 11Hz triangular wave.
Time series data for 0.2sec was recorded for each PZT.
The swept voltage at the resonances were extracted and the fringe number was counted. |
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Wed Jul 2 18:58:42 2014, Koji, General, General, Beam dump delamination
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While the OMC breadboard was being inspected, it was found that two out of five black-glass beam dumps showed sign of delamination.
(attached photos).
The base of the each beam dump is a fused silica disk (25mm dia.). The black glass pieces are bonded to the disk. The bond is EP30-2 |
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Thu Jul 3 17:45:18 2014, Koji, General, General, Beam dump delamination
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Here is the resolution.
I'll apply fillets of EP30-2 along the edges of the black glass (See figure).
In order to allow the air escape from the gap, the inside of the V will not be painted. |
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Tue Jul 8 04:08:06 2014, Koji, General, General, Expoxy reapplication for beam dumps
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Firstly, the excess epoxy was removed using a cleaned razor balde
|
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Sun Jul 6 03:56:40 2014, Koji, Optics, Characterization, HOM measurement with PZT vol swept
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| Cavity FSR/TMS measurement (2014/7/5) with PZT voltages swept from 0V to 200V (50V step) |
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Sun Jul 6 08:31:14 2014, Koji, Optics, Characterization, HOM measurement with PZT vol swept
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3rd OMC, HOM diagram at PZT1=0V and PZT2=50V.
First coincidence with the carrier is the 32nd-order carrier mode. Very good. |
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Sun Jul 6 02:46:20 2014, Koji, Optics, Characterization, OMC power budget
|
3rd OMC power budget (2014/7/2)
Input power: 34.8mW
|
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Sun Jul 6 02:45:56 2014, Koji, Optics, General, FSR Measurement
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3rd OMC FSR / Finesse measurement
RF AM was injected by detuning a HWP. |
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Tue Jun 24 18:43:15 2014, Koji, General, General, ICS entries for the OMC baking/assembly
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For baking:
Assembly Name aLIGO Output Mode Cleaner
Assembly Number D1201439 |
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Fri Jun 27 12:29:50 2014, Koji, General, General, OMC baking
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The OMC went into the oven at around 2PM on Thursday. It will be baked at 80degC for 48 hours.
The RGA result will be obtained on Monday.
Link to the ICS entry |
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Wed Jul 2 16:41:43 2014, Koji, General, General, OMC baking
|
OMC is back from the oven today.
To Do:
Optical tests |
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Fri Jun 27 18:51:33 2014, Koji, General, General, Supply
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PTOUCH TAPE (12mm white) x 2
9V batteries |
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Thu Jun 19 23:16:50 2014, Koji, Optics, General, All of the prisms have been glued
|
- All of the PRISM mirrors have been glued
- 4 out of 5 beam dumps have been glued
TODO |
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Fri Jun 20 18:59:12 2014, Koji, Optics, General, All of the invar blocks have been glued
|
All of the INVAR blocks have been glued.
I found thinner shims in the stock.
On Monday, the template will be removed. |
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Mon Jun 23 21:54:16 2014, Koji, Optics, General, All of the gluing completed
|
The bottom-side templates were removed.
The last beam dump was removed
TODO |