| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
169
|
Mon Oct 14 13:40:16 2013 |
Koji | Optics | Characterization | H1 OMC Optical testing | Since the middle of September, the optical
tests of H1 OMC were took place.
Here is summary of the progress. |
|
|
170
|
Mon Oct 14 15:50:55 2013 |
Koji | Optics | Characterization | H1 OMC Power budget | LHO OMC power budget
|
|
|
171
|
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 |
|
|
172
|
Wed Oct 16 19:16:29 2013 |
Koji | Optics | Characterization | PD alignment |
shim 1.5mm 001/002 |
|
|
180
|
Mon Mar 3 02:46:21 2014 |
Koji | General | Characterization | Spot positions scanned | Spot positions on CM1 and CM2 scanned according
to the recipes provided by the previous entry.
The best result obtained was: |
|
|
181
|
Tue Mar 25 17:10:10 2014 |
Koji | Optics | Characterization | OMC spot position estimation | Spot positions were inferred from the photos |
|
|
183
|
Mon May 12 22:43:02 2014 |
Koji | Optics | Characterization | Measured FSR/TSM of the OMC cavity | Data analysis of the FSR/TSM measruement
last week.
1. FSR was measured with "the |
|
|
184
|
Wed May 14 02:15:15 2014 |
Koji | Optics | Characterization | FSR/TSM adjustment of the OMC cavity | 1. FSR was adjusted and measured with "the
golden arches" technique again.
FSR = 264.8412 MHz +/- 1400Hz => |
|
|
185
|
Fri May 16 00:13:36 2014 |
Koji | Optics | Characterization | Cavity mirror gluing part 1 | BS1/FM1/FM2 for I1OMC were glued.
FM1 had to be intentionally rotated.
FM1 had to be intentionally shifted |
|
|
186
|
Sat May 17 07:40:14 2014 |
Koji | Optics | Characterization | I1OMC cavity mirrors glued | I1OMC cavity mirrors were glued.
FSR = 264.82MHz => Lcav = 1.132m
(nominal 1.132m) |
|
|
197
|
Sun Jul 6 02:46:20 2014 |
Koji | Optics | Characterization | OMC power budget | 3rd OMC power budget (2014/7/2)
Input power: 34.8mW
|
|
|
198
|
Sun Jul 6 03:56:40 2014 |
Koji | Optics | Characterization | HOM measurement with PZT vol swept | Cavity FSR/TMS measurement (2014/7/5) with
PZT voltages swept from 0V to 200V (50V step) |
|
|
199
|
Sun Jul 6 08:31:14 2014 |
Koji | Optics | Characterization | HOM measurement with PZT vol swept | 3rd OMC, HOM diagram at PZT1=0V and PZT2=50V.
First coincidence with the carrier
is the 32nd-order carrier mode. Very good. |
|
|
202
|
Tue Jul 8 18:54:54 2014 |
Koji | Mechanics | Characterization | PZT characterization | Each PZT was swept with 0-150V 11Hz triangular
wave.
Time series data for 0.2sec was recorded |
|
|
205
|
Thu Jul 10 23:22:28 2014 |
Koji | Optics | Characterization | I1OMC QPD | QPD#
QPD1
QPD2 |
|
|
206
|
Fri Jul 11 00:06:33 2014 |
Koji | Optics | Characterization | I1OMC PD | DCPD#
DCPD1 DCPD2
Housing# |
|
|
207
|
Sun Jul 13 17:46:28 2014 |
Koji | Optics | Characterization | OMC backscatter measurement | Backscattering
reflectivity of the 3rdOMC was measured.
Attached: Measurement setup |
|
|
208
|
Tue Jul 15 03:00:42 2014 |
Koji | Optics | Characterization | OMC backscatter measurement | Presence of the misaligned SRM (T=20%)
was forgotten in the previous entry.
This effectively reduces the OMC reflectivity |
|
|
209
|
Tue Jul 15 03:34:16 2014 |
Koji | Optics | Characterization | OMC backscatter measurement | Backscatter
measurement ~ 2nd round
Summary |
|
|
210
|
Thu Jul 17 02:19:20 2014 |
Koji | Mechanics | Characterization | I1OMC vibration test | Summary
- The breadboard has a resonance
at 1.2kHz. The resonant freq may be chagned |
6x |
|
211
|
Sun Jul 20 17:19:50 2014 |
Koji | Mechanics | Characterization | I1OMC vibration test ~ 2nd round | Improved
vibration measurement of the OMC
Improvement |
9x |
|
213
|
Mon Jul 21 01:02:43 2014 |
Koji | Mechanics | Characterization | Some structual mode analysis | Prisms
Fundamental: 12.3kHz Secondary: 16.9kHz
|
6x |
|
217
|
Wed Aug 27 23:13:13 2014 |
Koji | Optics | Characterization | Collection of the power budgetting info | L1
OMC Cavity power budget
H1 |
|
|
218
|
Tue Sep 9 20:59:19 2014 |
Koji | Mechanics | Characterization | Structural mode analysis for the PZT mirror | Structural analysis of the PZT mirror with
COMSOL.
Inline figures: Eigenmodes |
6x |
|
241
|
Tue Sep 8 11:18:10 2015 |
Koji | Optics | Characterization | PBS Transmission measurement | Motivation: Characterize
the loss of the Calcite Brewster PBS.
Setup: (Attachment |
|
|
242
|
Wed Sep 9 01:58:34 2015 |
Koji | Optics | Characterization | PBS Transmission measurement | Calcite Brewster PBS Continued
The
transmission loss of the Calcite brewster |
|
|
243
|
Thu Sep 10 04:03:42 2015 |
Koji | Optics | Characterization | More polarizer optics measurement (Summary) | Brewster calcite PBS (eLIGO
Squeezer OFI)
Loss L = 3600 +/- 200ppm |
|
|
244
|
Wed Sep 23 17:49:50 2015 |
Koji | Optics | Characterization | More polarizer optics measurement (Summary) | For the Glasgow PBS, the measurement has
been repeated with different size of beams.
In each case, the PBS crystal was |
|
|
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 |
|
|
247
|
Tue Dec 15 13:42:37 2015 |
Koji | Optics | Characterization | Dimensions / packaging of HQE PDs | The dimensions of a high QE PDs was measured
as well as the ones for C30665. (Attachment
4, Unit in mm) |
|
|
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 |
|
|
252
|
Sun Mar 6 02:13:28 2016 |
Koji | Optics | Characterization | PD glass reflections | On friday, I removed a glass cover of a
G30655 with a PD can cutter.
When a beam shoots a Perkin Elmer/Excelitas |
|
|
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 |
|
|
254
|
Sun Mar 13 22:02:09 2016 |
Koji | Optics | Characterization | HQEPD QE measurement (direct comaprison) | Direct comparison of the PD responsibities
We
can expect 5% increase of the QE with the |
|
|
255
|
Sat Mar 26 01:49:48 2016 |
Koji | Optics | Characterization | HQEPD QE | Calibration
of the transimpedance
Use KEITHLEY 2450 as a calibrated |
|
|
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. |
|
|
266
|
Tue Aug 23 23:36:54 2016 |
Koji | Optics | Characterization | Inspection of the damaged CM1 (prev H1OMC) | 1. Calum and GariLynn checking the CM1
defect from the front side.
2. Same as above |
7x |
|
267
|
Thu Aug 25 02:17:09 2016 |
Koji | Optics | Characterization | Inspection of the damaged CM1 (prev H1OMC) | Initial inspection results by Calum, et
al.
https://dcc.ligo.org/LIGO-E1600268 |
|
|
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. |
|
|
291
|
Thu Feb 22 20:21:02 2018 |
Koji | Optics | Characterization | aLIGO EOM test | POSTED
to 40m ELOG |
|
|
292
|
Mon Apr 2 17:27:04 2018 |
Koji | Optics | Characterization | aLIGO EOM test | 2nd optical test http://nodus.ligo.caltech.edu:8080/40m/13725 |
|
|
296
|
Wed May 30 16:40:38 2018 |
Koji | Mechanics | Characterization | EOM mount stability test | https://awiki.ligo-wa.caltech.edu/wiki/EOM_Mount_Stability |
|
|
297
|
Wed May 30 17:44:23 2018 |
Koji | Optics | Characterization | 3IFO EOM surface check | 3IFO EOM dark microscope images courtesy
by GariLynn and Rich
Attachment1/2: Hole #1 |
|
|
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 |
|