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ID Date Author Typedown Category Subject Text Attachments
  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 
  303   Thu Jul 26 20:57:07 2018 KojiElectronicsCharacterization9MHz port tuned impedance[Rich Koji]

The 9MHz port was tuned and the
impedance was measured.
 impedance_eom.pdfeom9.pdfeom_models_9MHz.pdf 
  304   Tue Aug 7 15:43:12 2018 KojiElectronicsCharacterizationNew LLO EOM stuffed[Rich, Dean, Koji]

Stuffed all inductors for the new
LLO EOM. As the impedances were sensitive
 P_20180806_154457.jpgimpedance_eom.pdfimpedance_eom_zoom.pdf 
  385   Tue Oct 22 15:54:59 2019 KojiElectronicsLoan / LendingBorrowed LB1005 from Cryo CavFrom Cryo Cav setup

Borrowed LB1005 Servo box ->
OMC
  
  402   Sat Nov 21 13:58:30 2020 KojiElectronicsCharacterizationDark Current Measurement for InGaAs QPDsDark current measurement for InGaAs QPDs
(OSI FCI-InGaAs-Q3000) has been done using
Keithley 2450 and Frank's diode test
 Q3000_dark_current.pdf 
  403   Sun Nov 22 13:49:12 2020 KojiElectronicsCharacterizationImpedance Measurement for InGaAs QPDsTo know any anomaly to the junction
capacitance of the QPD segments, the RF impedances
were tested with a hand-made impedance measurement.
 impedance_measurement.pdfP_20201121_183830.jpgimpedance_test.pdfQ3000_impedance_test.pdf 
  404   Mon Nov 23 23:17:19 2020 KojiElectronicsCharacterizationThe dark noise of the Q3000 QPDsThe dark noise levels of the four Q3000
QPDs were measured with FEMTO DLPCA200 low
noise transimpedance amp.
 Q3000_dark_noise_81.pdfQ3000_dark_noise_82.pdfQ3000_dark_noise_83.pdfQ3000_dark_noise_84.pdf 
  405   Tue Nov 24 10:45:07 2020 gautamElectronicsCharacterizationThe dark noise of the Q3000 QPDsI see that these measurements are done
out to 100 kHz - I guess there is no reason
to suspect anything at 55 MHz which is where
  
  406   Tue Nov 24 12:27:18 2020 KojiElectronicsCharacterizationThe dark noise of the Q3000 QPDsThe amplifier BW was 400kHz at the gain
of 1e7 V/A. And the max BW is 500kHz even
at a lower gain. I have to setup something
  
  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   
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