| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
365
|
Thu May 23 01:42:46 2019 |
Koji | Optics | Characterization | C30665 high power test | An Excelitas C30665 PD with the
cap removed (SN07 in Case H slot #2) was
exposed to the beam with the optical power |
|
|
366
|
Thu May 23 23:27:38 2019 |
Koji | Optics | Characterization | IGHQEX3000 high power test | LaserComponents IGHQEX3000 (Cage
B2: Serial# B1-23) was exposed to the beam
with the optical power from 1.6mW to 332mW. |
|
|
369
|
Mon Jul 1 12:38:49 2019 |
Koji | Optics | Characterization | A and M prisms perpendicularity measurement | [Stephen, Koji]
The perpendicularity of
some of the A and M prisms were tested. |
6x |
|
370
|
Mon Jul 1 12:49:42 2019 |
Koji | Optics | Characterization | Scattering measurement of A and C mirrors | Liyuan's scattering measurement for
the A and C mirrors. |
|
|
371
|
Thu Aug 22 12:35:53 2019 |
Stephen | Optics | Characterization | Wedging of the debonded PZTs 2019 August | Wedge and thickness measurements of PZTs
12 and 13 took place after debonding and
cleaning - results are shown in the first |
|
|
372
|
Fri Aug 23 11:11:44 2019 |
shruti | Optics | Characterization | Finding the curvature bottom | I attempted to fit the data taken
by Koji of the beam spot precession at the
CCD in order to find the location of the |
|
|
373
|
Thu Aug 29 11:51:49 2019 |
shruti | Optics | Characterization | Wedging of the debonded PZTs - Calculation | Using the measurements of PZTs 12,13 taken
by Stephen, I estimated the wedging angle
and orientation following Section 2.3.1 of |
|
|
395
|
Thu Oct 8 19:55:22 2020 |
Koji | General | Characterization | Power Measurement of Mephisto 800NE 1166A | The output of Mephisto 800NE (former TNI
laser) was measured.
The output power was measured with |
|
|
402
|
Sat Nov 21 13:58:30 2020 |
Koji | Electronics | Characterization | Dark Current Measurement for InGaAs QPDs | Dark current measurement for InGaAs QPDs
(OSI FCI-InGaAs-Q3000) has been done using
Keithley 2450 and Frank's diode test |
|
|
403
|
Sun Nov 22 13:49:12 2020 |
Koji | Electronics | Characterization | Impedance Measurement for InGaAs QPDs | To know any anomaly to the junction
capacitance of the QPD segments, the RF impedances
were tested with a hand-made impedance measurement. |
|
|
404
|
Mon Nov 23 23:17:19 2020 |
Koji | Electronics | Characterization | The dark noise of the Q3000 QPDs | The dark noise levels of the four Q3000
QPDs were measured with FEMTO DLPCA200 low
noise transimpedance amp. |
|
|
405
|
Tue Nov 24 10:45:07 2020 |
gautam | Electronics | Characterization | The dark noise of the Q3000 QPDs | I 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 |
Koji | Electronics | Characterization | The dark noise of the Q3000 QPDs | The 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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
346
|
Thu Apr 18 20:47:54 2019 |
Joe | Optics | | OMC initial alignment and locking | [Joe, Phillip, Koji, Stephen]
*draft post, please add anymore
info if I missed something* |
|
|
347
|
Fri Apr 19 09:21:07 2019 |
Philip | Optics | | Cleaning of OMC optics | ach[Joe, Phillip, Koji,
Stephen]
Work from 17.04.2019 |
|
|
348
|
Fri Apr 19 09:35:28 2019 |
Joe | General | | Adjusting cavity axis, re-alignment of OMC and locking | [koji,philip,
joe, liyuan,
steven] |
|
|
349
|
Fri Apr 19 11:34:19 2019 |
Koji | Optics | | OMC initial alignment and locking | The spot on CM1 was found displaced by
3.4mm (horiz.) and 3.0mm (vert.)
in the upper right direction looking from |
|
|
351
|
Mon Apr 22 09:54:21 2019 |
Joe | General | | Shortening cavity (A5,A14,PZT11,PZT22) to get closer to design FSR | [Koji,Joe,Philip,stephen]
in units 20um per div on the micrometer
[n.b. we reailised that its 10um per div |
|
|
352
|
Mon Apr 22 19:54:28 2019 |
Koji | General | | OMC(004): Spot positions at the end of Apr 22nd | |
|