| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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* |
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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 |
|
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352
|
Mon Apr 22 19:54:28 2019 |
Koji | General | | OMC(004): Spot positions at the end of Apr 22nd | |
|
|
527
|
Mon Apr 24 15:29:48 2023 |
Camille Makarem | Optics | | summary of zygo setups | Summary of Zygo setups
Initial Zygo Setup:
Our initial Zygo setup consisted of |
6x |
|
545
|
Fri Jun 2 13:28:09 2023 |
Camille Makarem | Electronics | | PZT op-lev measurements | The op-lev setup was modified slightly
(picture attached). The He-Ne laser was replaced
with one with a lower divergence angle. The |
|
|
551
|
Fri Jun 30 10:30:57 2023 |
Camille Makarem | Electronics | | Summary of DC response measurements | [Camille, Thejas, Stephen]
The DC response of the PZT was
measured using the following setup (pictures |
|
|
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... |
|
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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 |
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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 |
|
|
624
|
Mon Sep 18 15:09:55 2023 |
Thejas | Optics | CAvity Bonding | Piezo inertial micromaters | New piezo actuated micrometers from thorlabs
arrived last week.
4 x MPIA10 |
|
|
6
|
Fri Jun 29 11:26:04 2012 |
Zach | Optics | Characterization | RoC measurement setup | Here is the proposed RoC measurement
setup. Koji tells me that this is referred
to as "Anderson's method". |
|
|
8
|
Wed Jul 18 23:20:13 2012 |
Koji | Optics | Characterization | Mode scan results of ELIGO | Nic Smith sent me a bunch of elog lists
where the results of the mode scan can be
found. |
|
|
9
|
Sun Jul 22 15:56:53 2012 |
Zach | Optics | Characterization | RoC measurement setup | Here is a more detailed version of
the setup, so that we can gather the parts
we will need. |
|
|
31
|
Thu Oct 18 20:23:33 2012 |
Koji | Optics | Characterization | Improved measurement | Significant
improvement has been achieved in the RoC |
|
|
32
|
Wed Nov 7 01:28:20 2012 |
Koji | Optics | Characterization | Wedge angle test (A1) | Wedge
angle test
Result: Wedge angle of Prism A1: |
|
|
35
|
Thu Nov 8 13:24:53 2012 |
Koji | Optics | Characterization | More wedge measurement | A1
Horiz Wedge 0.497
+/- 0.004 deg |
|
|
39
|
Fri Nov 9 00:43:32 2012 |
Koji | Optics | Characterization | Further more wedge measurement | Now it's enough for the first OMC (or even
second one too).
Today's measurements all distributed |
|
|
40
|
Sat Nov 17 02:31:34 2012 |
Koji | Optics | Characterization | Mirror T test | Mirror T test
The mirror was misaligned to have
~2deg incident (mistakenly...) angle. |
|
|
41
|
Mon Nov 19 13:33:14 2012 |
Koji | Optics | Characterization | Resuming testing mirror RoCs | In order to resume testing the curvatures
of the mirrors, the same mirror as the previous
one was tested. |
|
|
42
|
Mon Nov 26 01:40:00 2012 |
Koji | Optics | Characterization | More RoC measurement | C1: RoC: 2.57845 +/− 4.2e−05m
|
|
|
44
|
Tue Dec 18 20:04:40 2012 |
Koji | Optics | Characterization | Prism Thickness Measurement | The thicknesses of the prism mirrors (A1-A5)
were measured with micrometer thickness gauge.
Since the thickness of the thinner |
|
|
49
|
Mon Dec 31 03:11:45 2012 |
Koji | Optics | Characterization | Further more RoC measurement | Total (excluding C2, C7, C8): 2.575 +/-
0.005 [m]
New results |
|
|
50
|
Wed Jan 2 07:35:55 2013 |
Koji | Optics | Characterization | Thickness of a curved mirror | Measured the thickness of a curved mirror:
Took three points separated by 120
degree. |
|
|
51
|
Wed Jan 2 07:45:39 2013 |
Koji | Optics | Characterization | First Contact test | Conclusion:
Good. First contact did not damage the coating
surface, and reduced the loss |
|
|
53
|
Thu Jan 10 18:37:50 2013 |
Koji | Optics | Characterization | Wedging of the PZTs | Yesterday I measured the thickness of the
PZTs in order to get an idea how much the
PZTs are wedged. |
|
|
54
|
Wed Jan 16 14:10:50 2013 |
Koji | Optics | Characterization | Autocollimator tests of optics perpendicularity/parallelism | The
items:
- Autocollimator (AC) borrowed from |
|
|
56
|
Sat Jan 19 20:47:41 2013 |
Koji | Optics | Characterization | Wedge measurement with the autocollimator | The wedge angle of the prism "A1"
was measured with the autocollimator (AC).
The range of the AC is 40 arcmin. |
|
|
59
|
Mon Feb 4 00:39:08 2013 |
Koji | Optics | Characterization | Wedge measurement with the autocollimator and the rotation stage | Method:
Mount the tombstone prism
on the prism mount. The mount is fixed on |
|
|
60
|
Wed Feb 6 02:34:10 2013 |
Koji | Optics | Characterization | Wedge measurement with the autocollimator and the rotation stage | Measurement:
A6: α
= 0.665 deg, β = +3.0 arcmin (1.5 div |
|
|
62
|
Thu Feb 7 23:01:45 2013 |
Koji | Optics | Characterization | UV epoxy gluing test | [Jeff, Yuta, Koji]
Gluing test with UV-cure epoxy
Optocast 3553-LV-UTF-HM |
|
|
66
|
Fri Mar 1 23:52:18 2013 |
Koji | Optics | Characterization | Wedge measurement with the autocollimator and the rotation stage | Measurement:
E1: α =
0.672 deg, β = +0.0 arcmin (0 div up)
|
|
|
67
|
Tue Mar 5 19:37:00 2013 |
Zach | Optics | Characterization | eLIGO OMC visibility vs. power measurement details | EDIT (ZK): Koji points out that (1 -
Ti) should really be the non-resonant reflectivity
of the aligned cavity, which is much closer |
|
|
68
|
Wed Mar 6 23:24:58 2013 |
Zach | Optics | Characterization | eLIGO OMC visibility vs. power measurement details | I found that, in fact, I had lowered
the modulation depth since when I measured
it to be 0.45 rads --> Psb = 0.1. |
|
|
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 |
|
|
74
|
Wed Mar 20 09:38:02 2013 |
Zach | Optics | Characterization | [LLO] OMC test bench modified | For various reasons, I had to switch
NPROs (from the LightWave 126 to the Innolight
Prometheus). |
|
|
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 |
|