| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
10
|
Mon Jul 23 17:15:14 2012 |
Koji | Clean | General | Talking with Margot | I consulted with Margot about the cleaning
of the optics
Optics are considered |
|
|
16
|
Mon Aug 13 16:59:11 2012 |
Koji | Clean | General | Room Cleaning Log | Floor 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 |
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) |
|
|
20
|
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 |
|
|
21
|
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) |
|
|
45
|
Wed Dec 19 18:47:03 2012 |
Koji | Clean | General | First Contact Training with Margot | Steve and I visited Margot to have a training
session for application of First Contact
on optics. |
|
|
127
|
Tue May 14 19:06:00 2013 |
Koji | Clean | General | OMC Baking | The OMC is in the air bake oven now.
|
|
|
361
|
Wed May 15 19:07:53 2019 |
Koji | Clean | General | What 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 |
|
|
368
|
Mon Jun 24 12:54:58 2019 |
Koji | Clean | General | HEPA BOOTH | https://www.airscience.com/purair-flow-laminar-flow-cabinets |
|
|
25
|
Tue Oct 9 05:03:15 2012 |
Koji | Electronics | General | OMC Test Electronics Setup | |
|
|
36
|
Thu Nov 8 19:47:55 2012 |
Koji | Electronics | Configuration | Solder for PZTs | Rich saids:
I |
|
|
72
|
Fri Mar 15 02:15:45 2013 |
Koji | Electronics | Characterization | Diode testing | Diode testing
o Purpose of the measurement
- Test Si QPDs (C30845EH) for ISC |
|
|
73
|
Sun Mar 17 21:59:47 2013 |
Koji | Electronics | Characterization | Diode 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 |
|
|
78
|
Sat Mar 23 16:36:15 2013 |
Koji | Electronics | Characterization | Diode QE measurement | Quantum efficiencies of the C30665GH
diodes were measured.
- The diode was biased by the FEMTO |
|
|
131
|
Thu May 30 14:38:42 2013 |
Koji | Electronics | General | Cable 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 |
Koji | Electronics | Configuration | PZT endurance test | [Koji, Jeff]
Background
In response to the failure of one |
|
|
157
|
Fri Aug 23 19:24:32 2013 |
Koji | Electronics | Configuration | PZT endurance test (II) | The
PZT tests were finished with the conclusion
that the PZT won't be damaged with our expected |
|
|
203
|
Thu Jul 10 01:39:38 2014 |
Koji | Electronics | General | PZT wire | Rich came to the OMC lab. Pins for the
mighty mouse connector were crimped on the
4 PZT wires. |
|
|
224
|
Wed Jul 15 22:23:17 2015 |
Koji | Electronics | AM Stabilized EOM Driver | E1400445 first look | This is not an OMC related and even not
happening in the OMC lab (happening at the
40m), but I needed somewhere to elog... |
|
|
225
|
Sat Jul 18 11:37:21 2015 |
Koji | Electronics | AM Stabilized EOM Driver | D0900848 power board ~ oscillation issue solved | Power Supply Board D0900848 was
oscillating. Here is the procedure how the
issue was fixed. |
6x |
|
227
|
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 |
|
|
228
|
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 |
|
|
229
|
Sat Jul 25 17:24:11 2015 |
Koji | Electronics | AM Stabilized EOM Driver | RF 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 |
Koji | Electronics | AM Stabilized EOM Driver | RF test of the EOM/AOM Driver S1500117 | Final Test Result of S1500117:
https://dcc.ligo.org/LIGO-S1500117
After some staring the |
|
|
231
|
Mon Aug 10 02:11:47 2015 |
Koji | Electronics | AM Stabilized EOM Driver | RF AM Measurement Unit E1500151 | This is an entry for the work on Aug 3rd.
LIGO
DCC E1500151 |
|
|
232
|
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. |
|
|
233
|
Mon Aug 10 11:57:17 2015 |
Koji | Electronics | AM Stabilized EOM Driver | RF AM Measurement Unit E1500151 | Spending some days to figure out how to
program CPLD (Xilinx CoolRunner II XC2C384).
I learned that the JTAG cable which |
|
|
234
|
Mon Aug 10 12:09:49 2015 |
Koji | Electronics | AM Stabilized EOM Driver | RF AM Measurement Unit E1500151 | Still suffering from a power supply
issue!
I have been tracking the issues |
|
|
235
|
Thu Aug 20 01:35:01 2015 |
Koji | Electronics | General | OMC DCPD in-vacuum electronics chain test | We wanted to know the transimpedance
of the OMC DCPD at high frequency (1M~10M).
For this purpose, the OMC DCPD chain |
|
|
236
|
Wed Aug 26 11:31:33 2015 |
Koji | Electronics | General | OMC DCPD in-vacuum electronics chain test | 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 |
|
|
237
|
Fri Aug 28 01:08:14 2015 |
Koji | Electronics | AM Stabilized EOM Driver | RF AM Measurement Unit E1500151 ~ Calibration | Worked on the calibration of the
RF AM Measurement Unit.
The calibration concept is as follows: |
|
|
238
|
Fri Aug 28 02:14:53 2015 |
Koji | Electronics | AM Stabilized EOM Driver | RF AM Measurement Unit E1500151 ~ 37MHz OCXO AM measurement | In order to check the noise level
of the RFAM detector, the power and cross
spectra for the same signal source |
|
|
239
|
Sun Sep 6 16:50:51 2015 |
Koji | Electronics | General | Unit test of the EOM/AOM Driver S1500118 | TEST
Result: S1500118
Additional |
|
|
240
|
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 |
|
|
245
|
Tue Dec 15 13:38:34 2015 |
Koji | Electronics | Characterization | EOM Driver linearity check | Linearity of the EOM driver was
tested. This test has been done on Nov 10,
2015. |
|
|
246
|
Tue Dec 15 13:39:13 2015 |
Koji | Electronics | Characterization | Phase noise measurement of aLIGO EOM drivers | This measurement has been done on Dec 1st,
2015.
The phase noise added by |
|
|
251
|
Sat Feb 20 19:11:22 2016 |
Koji | Electronics | Characterization | Dark current measurement of the HQE PD and other PDs | Dark current of the HQE PD and
other PDs were measured.
- The HQE PDs were loaded on the |
|
|
253
|
Sun Mar 13 21:22:27 2016 |
Koji | Electronics | Characterization | Dark current measurement of the HQE PD and other PDs | Transfered for RGA scan
B4 (C1-05) -> F1
C1 (C1-07) -> F2 |
|
|
256
|
Sat Mar 26 17:39:50 2016 |
Koji | Electronics | Characterization | HQEPD dark noise | Dark noise measurement for 6 HQEPDs and
1 C30665. All of these showed sufficiently
low dark current noise levels compared with |
|
|
257
|
Sat Mar 26 18:22:24 2016 |
Koji | Electronics | Characterization | Baking / Contamination tests of the PDs | For the production of the aLIGO PDs, the
following transfer of the PDs were carried
out |
|
|
259
|
Tue Apr 5 18:22:40 2016 |
Koji | Electronics | Characterization | Baking / Contamination tests of the PDs | Possible
reduction of the QE was observed after air-bake
at 75degC. |
|
|
260
|
Tue Apr 5 21:20:15 2016 |
Koji | Electronics | Characterization | More dark noise measurement | All survived PDs have been measured. |
|
|
276
|
Tue Mar 28 21:04:27 2017 |
Koji | Electronics | Characterization | PDH amp | Attachment 1: PDH amp
RF part (before the preamp was installed)
Attachment 2: |
6x |
|
286
|
Sat Jul 29 18:44:38 2017 |
rana | Electronics | Characterization | PDH amp | attachment 6: DCPD preamp looks like the
opamp is wired for positive feedback? |
|
|
287
|
Sat Jul 29 21:42:51 2017 |
Koji | Electronics | Characterization | PDH amp | The polarities indicated in the right circuits
were opposite, obviously. |
|
|
298
|
Mon Jul 2 11:30:22 2018 |
Koji | Electronics | Characterization | 3IFO EOM impedance measurement | [Rich Koji]
3IFO EOM (before any modification)
was tested to measure the impedance of each |
|
|
299
|
Mon Jul 2 12:29:01 2018 |
Koji | Electronics | Characterization | Impedances of individual components (3IFO EOM) | [Rich Koji]
The impedances of the individual
components from the 3IFO EOM (before modification) |
|
|
300
|
Mon Jul 2 15:27:31 2018 |
Rich Abbott | Electronics | General | Work on EOM (3rd IFO unit) | Koji, Rich
We took apart the unit removed
from the 3rd IFO (Unit serial number aLIGO |
|
|
301
|
Tue Jul 3 12:07:47 2018 |
Rich Abbott | Electronics | Characterization | Notes on 3rd IFO EOM | Attached please see my notes summarizing
the models for the electrodes and inductors
within the 3rd IFO EOM |
|
|
302
|
Wed Jul 4 18:30:51 2018 |
Koji | Electronics | Characterization | EOM circuit models | The circuit models for the 3IFO EOM (before
mods) were made using LISO.
Then the modification plan was made |
|