| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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 |
|
|
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) |
|
|
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 |
|
|
303
|
Thu Jul 26 20:57:07 2018 |
Koji | Electronics | Characterization | 9MHz port tuned impedance | [Rich Koji]
The 9MHz port was tuned and the
impedance was measured. |
|
|
304
|
Tue Aug 7 15:43:12 2018 |
Koji | Electronics | Characterization | New LLO EOM stuffed | [Rich, Dean, Koji]
Stuffed all inductors for the new
LLO EOM. As the impedances were sensitive |
|
|
305
|
Wed Aug 8 17:32:56 2018 |
Rich Abbott | General | Characterization | Modulation Index Test Setup at 40m Lab | Attached is a block diagram of the test
setup used in the 40m lab to measure the
modulation index of the IO modulator |
|
|
306
|
Thu Aug 9 11:24:29 2018 |
Koji | General | Characterization | Modulation Index Test Setup at 40m Lab | [Rich Koji]
The impedances of the new LLO EOM
were measured with the beat note setup at |
|
|
311
|
Thu Jan 10 20:42:54 2019 |
Koji | Optics | Characterization | FSR / HOM Test of OMC SN002 | OMC SN002 = Former LHO OMC
which CM1 was destroyed by the lock loss
pulse in 2016. This OMC needs to be optically |
|
|
312
|
Thu Jan 10 20:45:00 2019 |
Koji | Optics | Characterization | PZT test cable | As OMC SN002 already has the PZTs connected
to the Mighty-Mouse connector, a test cable
with a female mighty-mouse connector was |
|
|
313
|
Sat Jan 12 22:49:11 2019 |
Koji | Optics | Characterization | PM-SM patch cable mode cleaning effect | Mode
cleaning capability of an optical fiber was
measured. The conclusion |
|
|
315
|
Sat Feb 2 16:17:13 2019 |
Koji | Optics | Characterization | Summary: OMC(001) HOM structure recalculation | Each peak of the transfer function measurement
was fitted again with a complex function:
|
|
|
316
|
Sat Feb 2 20:03:19 2019 |
Koji | Optics | Characterization | Summary: OMC(002) HOM structure recalculation (before mirror replacement) | OMC (002)
History: Measurement date
2013/10/11, Installed to L1 2013/XX |
|
|
317
|
Sat Feb 2 20:28:21 2019 |
Koji | Optics | Characterization | Summary: OMC(003) HOM structure recalculation | OMC (003)
History: Measurement date
2014/7/5, Stored for I1, Installed to H1 |
|
|
318
|
Sat Feb 2 20:35:02 2019 |
Koji | Optics | Characterization | Summary: OMC(002) HOM structure recalculation (after mirror replacement) | OMC (002) after repair
History:Mirror replacement
after the damage at H1. Measurement date |
|
|
319
|
Tue Mar 19 17:30:25 2019 |
Koji | General | Characterization | OMC (002) Test items | OMC #002 Optical tests
FSR
measurement (done, 2019/1/8-9, 2019/4/1)
|
|
|
320
|
Thu Mar 28 16:36:52 2019 |
Koji | Mechanics | Characterization | OMC(002) PZT characterization | As
performed in the ELOG 202, the PZTs of
the OMC 002 were tested. |
|
|
322
|
Fri Apr 5 01:07:18 2019 |
Koji | Optics | Characterization | OMC(002): transmitted beam images | There was a concern that the transmission
from CM1 has additional fringes. The shape
of the transmitted beams from CM1, CM2, and |
|
|
323
|
Fri Apr 5 01:08:17 2019 |
Koji | Optics | Characterization | OMC(002): DCPD / QPD alignment | The beam height in the cavity became totally
different from the previous one and the shims
needed to be much thicker than before. This |
|
|
324
|
Fri Apr 5 20:50:54 2019 |
Koji | Optics | Characterization | OMC(002): QPD alignment | QPD#
QPD1
QPD2 |
|
|
336
|
Mon Apr 15 21:11:49 2019 |
Philip | Optics | Characterization | OMC(004): PZT testing for spare OMC | [Koji, Philip]
Today we tested the functionality
of the four remaining PZTs (11,12,13 and |
|
|
337
|
Tue Apr 16 11:36:36 2019 |
Koji | Optics | Characterization | OMC(004): PZT testing for spare OMC | Attachment 1: Shadow sensor
setup for the PZT displacement test
Attachment 2: |
9x |
|
342
|
Tue Apr 16 21:16:11 2019 |
Koji | Optics | Characterization | OMC(004): PZT testing for spare OMC | After having dug into the past email, it
turned out that these wires were the ones
already replaced from the original teflonwires. |
|
|
350
|
Sat Apr 20 00:50:12 2019 |
Koji | Optics | Characterization | OMC(004): Spot positions | Similarly to OMC
ELOG 349 the spot positions after the
replacement of CM2 were measured (Attachment |
|
|
354
|
Wed Apr 24 13:58:51 2019 |
Joe | Optics | Characterization | OMC power budget and UV Epoxy Bonding of BS1 | [koji,philip,joe,liyuan,stephen]
need to add spot positions.
Mirrors: PZT11,PZT22, A14, A5 |
|
|
355
|
Thu Apr 25 15:05:19 2019 |
Joe | Optics | Characterization | Looking at PZT HOM spacing dependance and thinking about workflow | [koji, joe]
The template or glass breadboard
was wobbling, and we noticed that the caivty |
|
|
356
|
Wed May 1 15:40:46 2019 |
Koji | Optics | Characterization | OMC(004): Spot positions and the scattering | Tried a few things.
1. Replaced CM1 (PZT ASSY
#10=M21+PZT#22+C12) with PZT ASSY #7 (=M1+PZT#13+C13) |
|
|
357
|
Fri May 3 11:06:28 2019 |
Koji | Optics | Characterization | OMC(004): Spot positions and the scattering | Experiment on 5/1
- CM1 right knob was moved 1div (10um)
backward such that the spots were better |
|
|
360
|
Thu May 9 18:10:24 2019 |
Koji | Optics | Characterization | OMC(004): Spot position scan / power budget | (Now the CCD image is captured as a movie
and the screen capture is easier!)
Various spot positions |
|
|
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 |
|