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ID Date Author Typeup Category Subject Text Attachments
  10   Mon Jul 23 17:15:14 2012 KojiCleanGeneralTalking with MargotI consulted with Margot about the cleaning
of the optics

    Optics are considered
  
  16   Mon Aug 13 16:59:11 2012 KojiCleanGeneralRoom Cleaning LogFloor wiped with a wet wiper (Aug 13, 2012)
Floor wiped with a wet wiper (Aug
15, 2012)
  
  17   Mon Aug 13 17:01:35 2012 KojiCleanGeneralParticle CountsAug 13, 2012 / 0.5um 1000~2000/(0.1 cu
ft) / 0.7um   400-600/(0.1 cu ft)
by ATF particle counter (MET ONE 227A)
  
  20   Tue Sep 25 14:18:14 2012 KojiCleanGeneralParticle CountsParticle counts
Before the prefilter is installed:
0.5um 1191cnts, 0.7um 346cnts
  
  21   Mon Oct 1 16:06:55 2012 KojiCleanGeneralParticle Counts1. It turned out that the particle
counter MET ONE 227A at ATF shows 
(particle count)/(0.1 ft^3) 
  
  45   Wed Dec 19 18:47:03 2012 KojiCleanGeneralFirst Contact Training with MargotSteve and I visited Margot to have a training
session for application of First Contact
on optics.
  
  127   Tue May 14 19:06:00 2013 KojiCleanGeneralOMC BakingThe OMC is in the air bake oven now.
  
  361   Wed May 15 19:07:53 2019 KojiCleanGeneralWhat is this???Suddenly something dirty emerged in the
lab. What is this? It looks like an insulation
foam or similar, but is quite degraded and
 P_20190515_185602.jpgP_20190515_185844.jpg 
  368   Mon Jun 24 12:54:58 2019 KojiCleanGeneralHEPA BOOTHhttps://www.airscience.com/purair-flow-laminar-flow-cabinets   
  25   Tue Oct 9 05:03:15 2012 KojiElectronicsGeneralOMC Test Electronics Setup   electronics_setup.pngelectronics_setup.pdf 
  36   Thu Nov 8 19:47:55 2012 KojiElectronicsConfigurationSolder for PZTsRich saids:
I
  
  72   Fri Mar 15 02:15:45 2013 KojiElectronicsCharacterizationDiode testingDiode testing
o Purpose of the measurement
- Test Si QPDs (C30845EH) for ISC
 QPD_GR_TEST_130316.pdf 
  73   Sun Mar 17 21:59:47 2013 KojiElectronicsCharacterizationDiode testing ~ DCPD- For the dark noise measurement, the lid
of the die-cast case should also contact
to the box for better shielding. This made
 OMCPD_TEST_130317.pdf 
  78   Sat Mar 23 16:36:15 2013 KojiElectronicsCharacterizationDiode QE measurementQuantum efficiencies of the C30665GH
diodes were measured. 
- The diode was biased by the FEMTO
 P3213308.JPGP3213310.JPG 
  131   Thu May 30 14:38:42 2013 KojiElectronicsGeneralCable fitting Yesterday Jeff and Chub worked on the cabling
of the OMC. It turned out that the gender
of the cable connectors 
  
  156   Thu Aug 22 15:40:15 2013 KojiElectronicsConfigurationPZT endurance test[Koji, Jeff]
Background
In response to the failure of one
 P8214340.jpgP8214337.jpgIR_0457.jpgIR_0461.jpg 
  157   Fri Aug 23 19:24:32 2013 KojiElectronicsConfigurationPZT endurance test (II)The
PZT tests were finished with the conclusion
that the PZT won't be damaged with our expected
 PZT_shaking.png 
  203   Thu Jul 10 01:39:38 2014 KojiElectronicsGeneralPZT wireRich came to the OMC lab. Pins for the
mighty mouse connector were crimped on the
4 PZT wires.
 P7096669.JPG 
  224   Wed Jul 15 22:23:17 2015 KojiElectronicsAM Stabilized EOM DriverE1400445 first lookThis is not an OMC related and even not
happening in the OMC lab (happening at the
40m), but I needed somewhere to elog...
 IMG_20150714_195534852.jpgIMG_20150714_195227746_HDR.jpg 
  225   Sat Jul 18 11:37:21 2015 KojiElectronicsAM Stabilized EOM DriverD0900848 power board ~ oscillation issue solvedPower Supply Board D0900848 was
oscillating. Here is the procedure how the
issue was fixed.
 6x 
  227   Wed Jul 22 09:43:01 2015 KojiElectronicsAM Stabilized EOM DriverPower supply test of the EOM/AOM DriverSerial Number of the unit: S1500117
Tester: Koji Arai
  
  228   Wed Jul 22 10:15:14 2015 KojiElectronicsAM Stabilized EOM DriverRF test of the EOM/AOM Driver S15001177) Make sure the on/off RF button works,
=> OK

8) Make sure the power output doesn't
  
  229   Sat Jul 25 17:24:11 2015 KojiElectronicsAM Stabilized EOM DriverRF test of the EOM/AOM Driver S1500117(Calibration for Attachment 5 corrected
Aug 27, 2015)


Now the test procedure
 7x 
  230   Tue Jul 28 18:36:50 2015 KojiElectronicsAM Stabilized EOM DriverRF test of the EOM/AOM Driver S1500117Final Test Result of S1500117:
https://dcc.ligo.org/LIGO-S1500117


After some staring the
 IMG_20150727_214536773_HDR.jpgEOM_Driver_DAQ_TF_test.pdfEOM_Driver_Mon_PSD.pdf 
  231   Mon Aug 10 02:11:47 2015 KojiElectronicsAM Stabilized EOM DriverRF AM Measurement Unit E1500151This is an entry for the work on Aug 3rd.

LIGO
DCC E1500151
 IMG_20150803_223403975.jpgIMG_20150803_221210816_HDR.jpgIMG_20150803_223420267.jpg 
  232   Mon Aug 10 11:39:40 2015 KojiElectronicsAM Stabilized EOM DriverRF AM Measurement Unit E1500151Entry for Aug 6th, 2015

I faced with difficulties to operate
the RF AM detectors.
  
  233   Mon Aug 10 11:57:17 2015 KojiElectronicsAM Stabilized EOM DriverRF AM Measurement Unit E1500151Spending some days to figure out how to
program CPLD (Xilinx CoolRunner II XC2C384).

I learned that the JTAG cable which
 screen_shot.png 
  234   Mon Aug 10 12:09:49 2015 KojiElectronicsAM Stabilized EOM DriverRF AM Measurement Unit E1500151Still suffering from a power supply
issue!

I have been tracking the issues
 IMG_20150809_215628585_HDR.jpg 
  235   Thu Aug 20 01:35:01 2015 KojiElectronicsGeneralOMC DCPD in-vacuum electronics chain testWe wanted to know the  transimpedance
of the OMC DCPD at high frequency (1M~10M).
For this purpose, the OMC DCPD chain
 OMC_DCPD_Chain.pdfOMC_DCPD_Transimpedance.pdf 
  236   Wed Aug 26 11:31:33 2015 KojiElectronicsGeneralOMC DCPD in-vacuum electronics chain testThe 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
 OMC_DCPD_OutputNoise.pdf 
  237   Fri Aug 28 01:08:14 2015 KojiElectronicsAM Stabilized EOM DriverRF AM Measurement Unit E1500151 ~ CalibrationWorked on the calibration of the
RF AM Measurement Unit. 

The calibration concept is as follows:
 RFAM_detector_calib.pdfRFAM_detector_calib_spectra.pdf 
  238   Fri Aug 28 02:14:53 2015 KojiElectronicsAM Stabilized EOM DriverRF AM Measurement Unit E1500151 ~ 37MHz OCXO AM measurementIn order to check the noise level
of the RFAM detector, the power and cross
spectra for the same signal source
 OCXO_AM_noise.pdf 
  239   Sun Sep 6 16:50:51 2015 KojiElectronicsGeneralUnit test of the EOM/AOM Driver S1500118TEST
Result: S1500118

Additional
 P9037810.JPGRF_AM_spectra.pdf 
  240   Tue Sep 8 10:55:31 2015 KojiElectronicsAM Stabilized EOM DriverRF AM Measurement Unit E1500151 ~ 37MHz OCXO AM measurementTest sheet: https://dcc.ligo.org/LIGO-E1400445

Test Result (S1500114): https://dcc.ligo.org/S1500114
  
  245   Tue Dec 15 13:38:34 2015 KojiElectronicsCharacterizationEOM Driver linearity checkLinearity of the EOM driver was
tested. This test has been done on Nov 10,
2015.
 Output_linearity.pdfCtrl_Bias.pdf 
  246   Tue Dec 15 13:39:13 2015 KojiElectronicsCharacterizationPhase noise measurement of aLIGO EOM driversThis measurement has been done on Dec 1st,
2015.


The phase noise added by
 phase_noise.pdfphase_noise_9MHz.pdf 
  251   Sat Feb 20 19:11:22 2016 KojiElectronicsCharacterizationDark current measurement of the HQE PD and other PDsDark current of the HQE PD and
other PDs were measured.

- The HQE PDs were loaded on the
 P2197992.jpgPD_dark_current.pdfPD_dark_current_others.pdf 
  253   Sun Mar 13 21:22:27 2016 KojiElectronicsCharacterizationDark current measurement of the HQE PD and other PDsTransfered for RGA scan

B4 (C1-05) -> F1
C1 (C1-07) -> F2
  
  256   Sat Mar 26 17:39:50 2016 KojiElectronicsCharacterizationHQEPD dark noiseDark noise measurement for 6 HQEPDs and
1 C30665. All of these showed sufficiently
low dark current noise levels compared with
 PD_dark_current.pdf 
  257   Sat Mar 26 18:22:24 2016 KojiElectronicsCharacterizationBaking / Contamination tests of the PDsFor the production of the aLIGO PDs, the
following transfer of the PDs were carried
out
  
  259   Tue Apr 5 18:22:40 2016 KojiElectronicsCharacterizationBaking / Contamination tests of the PDsPossible
reduction of the QE was observed after air-bake
at 75degC.
 QE_after_air_bake.pdf 
  260   Tue Apr 5 21:20:15 2016 KojiElectronicsCharacterizationMore dark noise measurementAll survived PDs have been measured.  PD_dark_current.pdf 
  276   Tue Mar 28 21:04:27 2017 KojiElectronicsCharacterizationPDH ampAttachment 1: PDH amp
RF part (before the preamp was installed)

Attachment 2:
 6x 
  286   Sat Jul 29 18:44:38 2017 ranaElectronicsCharacterizationPDH ampattachment 6: DCPD preamp looks like the
opamp is wired for positive feedback?
  
  287   Sat Jul 29 21:42:51 2017 KojiElectronicsCharacterizationPDH ampThe polarities indicated in the right circuits
were opposite, obviously.
  
  298   Mon Jul 2 11:30:22 2018 KojiElectronicsCharacterization3IFO EOM impedance measurement[Rich Koji]

3IFO EOM (before any modification)
was tested to measure the impedance of each
 impedance_eom.pdfEOM_Z_DATA.zip 
  299   Mon Jul 2 12:29:01 2018 KojiElectronicsCharacterizationImpedances of individual components (3IFO EOM)[Rich Koji]

The impedances of the individual
components from the 3IFO EOM (before modification)
 impedance_coils.pdfimpedance_xtals.pdfq_coils.pdfcomponent_models.pdfliso_models.zip 
  300   Mon Jul 2 15:27:31 2018 Rich AbbottElectronicsGeneralWork on EOM (3rd IFO unit)Koji, Rich

We took apart the unit removed
from the 3rd IFO (Unit serial number aLIGO
 EOM3_aLIGO_3rdIfo.JPG 
  301   Tue Jul 3 12:07:47 2018 Rich AbbottElectronicsCharacterizationNotes on 3rd IFO EOMAttached please see my notes summarizing
the models for the electrodes and inductors
within the 3rd IFO EOM
 EOM_Analysis2.pdf 
  302   Wed Jul 4 18:30:51 2018 KojiElectronicsCharacterizationEOM circuit modelsThe circuit models for the 3IFO EOM (before
mods) were made using LISO.
Then the modification plan was made
 eom_models.pdfeom9.pdfeom24.pdfeom45.pdf180704_3IFO_EOM_model.zip 
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