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Entry  Mon Apr 8 11:49:18 2013, Koji, Mechanics, Characterization, PZT actuator tested at LLO 
Test result of the PZTs by Valera and Ryan
PZT  Length Angle
 #   [nm/V] [urad/um]
 11  14.5   17.6
 12  13.8   17.8
 13  11.2   25.0
 14  14.5    6.6
 15  12.5   10.6


21  14.5    9.7
 22  13.8   28.8
 23  14.5    6.8  ==> Assembly #2
 24  18.5   51.7  ==> Used for prototyping
 25  17.1   13.8
Entry  Mon Apr 8 21:11:14 2013, Koji, Optics, General, PZT assembly gluing 
[Jeff, Zach, Koji] 
PZT assembly gluing
Glue gun -> to be returned to MIT
    Reply  Tue Apr 9 13:56:09 2013, Koji, Optics, General, PZT assembly post gluing / pre baking pictures 
 
Entry  Sat Mar 23 13:34:14 2013, Koji, Optics, General, PZT assembly prototype glued P3223322.jpgP3223323.jpgP3233336.jpgP3233348.jpg
 
Prototype PZT assembly
Motivation:
Entry  Tue Jul 8 18:54:54 2014, Koji, Mechanics, Characterization, PZT characterization PZT_Scan.pdfI1OMC_PZT_Response.pdf
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.
Entry  Fri Feb 1 12:52:12 2019, Koji, Mechanics, General, PZT deformation simulation pzt.png
A simple COMSOL simulation was run to see how the PZT deforms as the voltage applied.

Use the geometry of the ring PZT which is used in the OMCs -  NAC2124 (OD 15mm, ID 9mm, H 2mm)
The material is PZT-5H (https://bostonpiezooptics.com/ceramic-materials-pzt) which
Entry  Thu Aug 22 15:40:15 2013, Koji, Electronics, Configuration, PZT endurance test P8214340.jpgP8214337.jpgIR_0457.jpgIR_0461.jpg
[Koji, Jeff]
Background
In response to the failure of one of the PZTs on L1OMC (LLO:8366), we
    Reply  Fri Aug 23 19:24:32 2013, Koji, Electronics, Configuration, PZT endurance test (II) PZT_shaking.png
The PZT tests were finished with the conclusion that the PZT won't be damaged with our expected usage.

This is another test of the PZTs to make sure small (~10V) reverse voltage does not break the PZTs.
Background
Entry  Thu Apr 11 12:15:31 2019, Koji, Mechanics, Configuration, PZT sub assy mirror orientations PZT_subassy.pngPZT_subassy.pdf
 
Entry  Thu Jan 10 20:45:00 2019, Koji, Optics, Characterization, PZT test cable OMC_PZT_wiring.pdf
As OMC SN002 already has the PZTs connected to the Mighty-Mouse connector, a test cable with a female mighty-mouse connector was made.

A small imperfection: When the cable was inserted to the connector shell, I forgot to mirror the pin out. Therefore the color and pin number
do not match.
Entry  Thu Jul 10 01:39:38 2014, Koji, Electronics, General, PZT wire P7096669.JPG
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
Entry  Thu Jun 21 03:07:27 2012, Zach, Optics, Configuration, Parameter selection / mode definition geom_bowtie.pnggeom_non-bowtie.png
EDIT 2 (ZK): As with the previous post, all plots and calculations
here are done with my MATLAB cavity modeling utility, 
Entry  Mon Aug 13 17:01:35 2012, Koji, Clean, General, Particle Counts 
Aug 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)
They are counts/(0.1 ft^3)! These numbers should be multiplied by 10 to know the particle "CLASS".
Entry  Tue Sep 25 14:18:14 2012, Koji, Clean, General, Particle Counts 
Particle counts
Before the prefilter is installed: 0.5um 1191cnts, 0.7um 346cnts
2:20 prefilter installed
    Reply  Mon Oct 1 16:06:55 2012, Koji, Clean, General, Particle Counts 
1. It turned out that the particle counter MET ONE 227A at ATF shows 
(particle count)/(0.1 ft^3) 
Entry  Fri Oct 23 19:09:54 2020, Koji, General, General, Particle counter transfered to Radhika 
See this entry: https://nodus.ligo.caltech.edu:8081/40m/15642
Entry  Thu Feb 21 18:44:18 2013, Koji, Optics, Configuration, Perpendicularity test perpendicularity_test.pdfP2203206.JPG
Perpendicularity test of the mounting prisms:
The perpendicularity of the prism pieces were measured with an autocollimator.
Two orthogonally jointed surfaces forms a part of a corner cube. 
Entry  Tue Dec 15 13:39:13 2015, Koji, Electronics, Characterization, Phase noise measurement of aLIGO EOM drivers phase_noise.pdfphase_noise_9MHz.pdf
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
Entry  Tue Jul 31 21:33:17 2012, Koji, General, General, Plan Update: August [!] 
Completed work of the previous months: [Jul] [Aug] [Sep] [Oct] [Nov] [Dec]

Facility/Supplies

    Work done
    
        Floor
Entry  Sat Jul 14 02:16:07 2012, Koji, General, General, Plan Update: July P7071878.jpg
Facility/Supplies

    Work in progress     
    
        Floor cleaning
        Plug slits on the roof of the HEPA booth - blanking panels have been ordered 
Entry  Wed Nov 7 20:44:11 2012, Koji, General, General, Plan Update: November [!] OMC_Project_Schedule.pdf
Completed work of the previous months: [Jul] [Aug]
[Sep] [Oct] [Nov]
[Dec]
Entry  Tue Oct 16 15:51:01 2012, Koji, General, General, Plan Update: October [!] 
Completed work of the previous months: [Jul] [Aug]
[Sep] [Oct] [Nov] [Dec]

Facility/Supplies
Entry  Mon Jun 3 21:19:03 2013, Koji, General, General, Planning 
Monday - Evening
(Koji)
[done] - DCPD alignment
Entry  Thu Oct 8 19:55:22 2020, Koji, General, Characterization, Power Measurement of Mephisto 800NE 1166A Mephisto800NE_1166A.pdf
The output of Mephisto 800NE (former TNI laser) was measured.
The output power was measured with Thorlabs sensors (S401C and S144C). The reference output record on the chassis says the output was 837mW at 2.1A
injection.
    Reply  Wed Jul 22 09:43:01 2015, Koji, Electronics, AM Stabilized EOM Driver, Power supply test of the EOM/AOM Driver 
Serial Number of the unit: S1500117
Tester: Koji Arai
Test Date: Jul 22, 2015 
Entry  Fri Nov 6 18:38:00 2020, Koji, General, General, Powermeter lent from OMC Lab to 2um ECDL 
Thorlabs' powermeter controler + S401C head was lent from OMC Lab. Returned to OMC Jul 15, 2022 KA

https://nodus.ligo.caltech.edu:8081/SUS_Lab/1856
Entry  Thu Nov 30 12:18:41 2017, Stephen, General, General, Preparation for Modal Testing on 4 December 
Norna Robertson, Stephen Appert ||  29 Nov 2017, 2 pm to 4 pm  ||  227 Downs, CIT

We made some preparations for modal testing, but did not have enough time to make measurements. Below is an after-the-fact log, including some
observations and photos of the current state of the OMC bench.
Entry  Fri Sep 8 15:14:05 2017, Koji, Facility, General, Preparation for the plumbing work 7x
[Steve, Aaron, Koji]

We've finished the preparation for the forthcoming plumbing work on (nominally) Sept 16th Saturday.
We've covered most of the west side of the OMC lab with plastic sheets and wraps.
Entry  Mon Aug 15 10:09:10 2016, Koji, General, General, Prev H1 OMC shipped to CIT 
Previous H1 OMC shipped from LHO to CIT

https://ics-redux.ligo-la.caltech.edu/JIRA/browse/Shipment-8196
Entry  Tue Dec 18 20:04:40 2012, Koji, Optics, Characterization, Prism Thickness Measurement prism.png
The thicknesses of the prism mirrors (A1-A5) were measured with micrometer thickness gauge.
Since the thickness of the thinner side (side1) depends on the depth used for the measurement,
it is not accurate. Unit in mm.
Entry  Thu Jan 19 20:57:53 2017, Koji, Supply, General, Purchase 
Ordered:

Office Depot
v AA battery Qty. 24
    Reply  Thu Feb 16 17:23:12 2017, Koji, Supply, General, Purchase 

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
Entry  Thu Apr 4 20:07:39 2019, Koji, Supply, General, Purchase 
== Office Depot ==
Really Useful Box 9L x 6 (delivered)
Really Useful Box 17L x 5 (ordered 4/4)
Entry  Tue Apr 5 18:14:55 2016, Koji, General, Loan / Lending, QPD Lending Crackle 
Xiaoyue

QPD head
X-Z stage
Entry  Thu May 30 15:00:28 2013, Koji, Optics, General, QPD alignment 
The QPD alignment was adjusted using the aligned beam to the cavity and the 4ch transimpedance amplifier.
As I have a test cable for the QPD, I attached a DB9 connector on it so that I can use the QPD transimpedance
amplifier to read the photocurrent. The transimpedance of the circuit is 1kV/A. 
    Reply  Fri May 31 05:46:54 2013, Koji, Optics, General, QPD alignment QPD1.JPGQPD2.JPGQPD_calib.nb.zip
Peter F suggested to check the bottom surface of the PD housings if there is any protrusion/interference/whatever.
And that was true! It was found that the front side of QPD1 (Left) was lifted by a machining burr.
It seems that this burr consistently exists as the other one also have it (see QPD2 picture (right)) although it is not too terrible compared to
Entry  Tue Oct 15 18:50:08 2013, Koji, Optics, Characterization, QPD alignment 
1) Deburr the bottom surfaces of the QPD housings
2) Aligned the QPDs
 
Entry  Wed Apr 17 07:30:04 2013, Koji, Optics, General, QPD path glued 
Yesterday, all of the glass components for the QPD path were glued.

- Check the alignment of the beam with the cavity.
Entry  Mon Aug 10 02:11:47 2015, Koji, Electronics, AM Stabilized EOM Driver, RF AM Measurement Unit E1500151 IMG_20150803_223403975.jpgIMG_20150803_221210816_HDR.jpgIMG_20150803_223420267.jpg
This is an entry for the work on Aug 3rd.

LIGO DCC E1500151

Power supply check
    Reply  Mon Aug 10 11:39:40 2015, Koji, Electronics, AM Stabilized EOM Driver, RF AM Measurement Unit E1500151 
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
    Reply  Mon Aug 10 11:57:17 2015, Koji, Electronics, AM Stabilized EOM Driver, RF AM Measurement Unit E1500151 screen_shot.png
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)
    Reply  Mon Aug 10 12:09:49 2015, Koji, Electronics, AM Stabilized EOM Driver, RF AM Measurement Unit E1500151 IMG_20150809_215628585_HDR.jpg
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
    Reply  Fri Aug 28 02:14:53 2015, Koji, Electronics, AM Stabilized EOM Driver, RF AM Measurement Unit E1500151 ~ 37MHz OCXO AM measurement OCXO_AM_noise.pdf
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
    Reply  Tue Sep 8 10:55:31 2015, Koji, Electronics, AM Stabilized EOM Driver, RF AM Measurement Unit E1500151 ~ 37MHz OCXO AM measurement 
Test sheet: https://dcc.ligo.org/LIGO-E1400445

Test Result (S1500114): https://dcc.ligo.org/S1500114
    Reply  Fri Aug 28 01:08:14 2015, Koji, Electronics, AM Stabilized EOM Driver, RF AM Measurement Unit E1500151 ~ Calibration RFAM_detector_calib.pdfRFAM_detector_calib_spectra.pdf
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
Entry  Wed Aug 29 11:06:30 2018, Koji, General, General, RF AM RIN and dBc conversion 
0. If you have an RF signal whose waveform is , the amplitude is constant and 1.

1. If the waveform 
    Reply  Wed Jul 22 10:15:14 2015, Koji, Electronics, AM Stabilized EOM Driver, RF test of the EOM/AOM Driver S1500117 
7) Make sure the on/off RF button works,
=> OK

8) Make sure the power output doesn't oscillate,
    Reply  Sat Jul 25 17:24:11 2015, Koji, Electronics, AM Stabilized EOM Driver, RF test of the EOM/AOM Driver S1500117 7x
(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
    Reply  Tue Jul 28 18:36:50 2015, Koji, Electronics, AM Stabilized EOM Driver, RF test of the EOM/AOM Driver S1500117 IMG_20150727_214536773_HDR.jpgEOM_Driver_DAQ_TF_test.pdfEOM_Driver_Mon_PSD.pdf
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.
    Reply  Mon Nov 19 13:33:14 2012, Koji, Optics, Characterization, Resuming testing mirror RoCs Cav_scan_response_zoom_20121016.pdf
In order to resume testing the curvatures of the mirrors, the same mirror as the previous one was tested.
The result looks consistent with the previous measurement.
It seems that there has been some locking offset. Actually, the split peaks in the TF@83MHz indicates 
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