| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
15883
|
Mon Mar 8 22:01:26 2021 |
gautam | Update | LSC | More PRMI | There are still many mysteries remaining
- e.g. the MICH-->PRCL contribution still
can't be nulled. But for now, I have |
|
|
15892
|
Wed Mar 10 00:32:03 2021 |
gautam | Update | LSC | PRFPMi | The interferometer can nearly be locked
again. I was unable to fully hand off control
from ALS-->RF, I suspect I may be using |
|
|
15899
|
Wed Mar 10 19:58:27 2021 |
gautam | Update | LSC | SR785 hooked up to CM board | In preparation for later today evening.
The TT alignment wasn't visibly disturbed. |
|
|
15900
|
Thu Mar 11 01:45:42 2021 |
gautam | Update | LSC | PRFPMi |
PRM satellite box indeed seems
to have been the culprit - shortly after
I swapped it to the SRM, its shadow sensors |
|
|
15903
|
Thu Mar 11 14:03:02 2021 |
gautam | Update | LSC | AO path | There is some evidence of weird saturation
but the gain balancing (0.8dB) and orthogonality
(~89 deg) for the daughter board on the REFL11 |
|
|
15906
|
Thu Mar 11 20:18:00 2021 |
gautam | Update | LSC | High bandwidth POY | I repeated the high bandwidth POY locking
experiment.
The "Q" demod |
|
|
15917
|
Fri Mar 12 19:44:31 2021 |
gautam | Update | LSC | Delay line | I may want to use the delay line phase
shifter in 1Y2 to allow remote actuation
of the REFL11 demod phase (for the AO path, |
|
|
15918
|
Fri Mar 12 21:15:19 2021 |
gautam | Update | LSC | coronaversary PRFPMi | Attachment
#1 - proof that the |
|
|
15923
|
Tue Mar 16 16:02:33 2021 |
Koji | Update | LSC | REFL11 demod retrofitting | I'm going to remove REFL11 demod for
the noise check/circuit improvement.
---- |
|
|
15927
|
Wed Mar 17 00:05:26 2021 |
gautam | Update | LSC | Delay line BIO remote control | While Koji is working on the REFL 11 demod
board, I took the opportunity to investigate
the non-remote-controllability of the |
|
|
15935
|
Thu Mar 18 01:12:31 2021 |
gautam | Update | LSC | PRFPMi |
Integrated >1
hour at RF only control, high circulating
powers tonight.
All |
|
|
15936
|
Thu Mar 18 07:02:27 2021 |
Koji | Update | LSC | REFL11 demod retrofitting | Attachment 1: Transfer Functions
The original circuit had a gain
of ~20 and the phase delay of ~1deg at 10kHz, |
|
|
15942
|
Thu Mar 18 21:37:59 2021 |
rana | Update | LSC | PRMI investigations: what IS the matrix?? |
Locked PRMI several tmes after
Gautam setup. Easy w IFO CONFIG screen |
|
|
15944
|
Fri Mar 19 11:18:25 2021 |
gautam | Update | LSC | PRMI investigations: what IS the matrix?? | From Finesse simulation (and also analytic
calcs), the expected PRCL optical gain
is ~1 MW/m (there is a large uncertainty, |
|
|
15949
|
Fri Mar 19 22:24:54 2021 |
gautam | Update | LSC | PRMI investigations: what IS the matrix?? | I did all these checks today.
|
|
|
15956
|
Wed Mar 24 00:51:19 2021 |
gautam | Update | LSC | Schnupp asymmetry | I used the Valera technique to measure
the Schnupp asymmetry to be |
|
|
15958
|
Wed Mar 24 15:24:13 2021 |
gautam | Update | LSC | Notes on tests | For my note-taking:
Lock PRMI with ITMs as
the MICH actuator. Confirm that the MICH-->PRCL |
|
|
15960
|
Wed Mar 24 22:54:49 2021 |
gautam | Update | LSC | New day, new problems | I thought I'd get started on some of
the tests tonight. But I found that this
problem had resurfaced. I don't know |
|
|
15977
|
Mon Mar 29 19:32:46 2021 |
gautam | Update | LSC | REFL55 whitening checkout | I repeated the usual whitening board characterization
test of:
driving a signal (using |
|
|
15994
|
Sat Apr 3 00:42:40 2021 |
gautam | Update | LSC | PRFPMI locking with half input power | Summary:
I wanted to put my optomechanical
instability hypothesis to the test. So |
|
|
15996
|
Mon Apr 5 22:26:01 2021 |
gautam | Update | LSC | PRMI 1f locking (no ETMs) recovered | Since it seems like the entire electronics
chain has no obvious failure, I decided to
compensate for the apparent increased optical |
|
|
16095
|
Thu Apr 29 11:51:27 2021 |
Anchal | Summary | LSC | Start of measuring IMC WFS noise contribution in ar cavity length noise | Tried locking the arms
Ran IFO > Configure
> ! (YARM) > Restore YARM. Nothing |
|
|
16101
|
Thu Apr 29 17:51:19 2021 |
Anchal | Summary | LSC | Start of measuring IMC WFS noise contribution in arm cavity length noise | t Both arms were locked simply by using
IFO > Configure > ! (YARM) > Restore
YARM. I had to use ASS to improve the TRX/TRY |
|
|
16104
|
Fri Apr 30 00:18:40 2021 |
gautam | Summary | LSC | Start of measuring IMC WFS noise contribution in arm cavity length noise | This is the actuator calibration.
For the error point calibration, you have
to look at the filter in the calibration |
|
|
16108
|
Mon May 3 09:14:01 2021 |
Anchal, Paco | Update | LSC | IMC WFS noise contribution in arm cavity length noise | Lock
ARMs |
|
|
16112
|
Mon May 3 17:28:58 2021 |
Anchal, Paco, Rana | Update | LSC | IMC WFS noise contribution in arm cavity length noise | Rana came and helped us figure us where
to inject the noise. Following are the characteristics
of the test we did: |
|
|
16117
|
Tue May 4 11:43:09 2021 |
Anchal, Paco | Update | LSC | IMC WFS noise contribution in arm cavity length noise | We redid the WFS noise injection test and
have compiled some results on noise contribution
in arm cavity noise and IMC frequency noise |
|
|
16127
|
Fri May 7 11:54:02 2021 |
Anchal, Paco | Update | LSC | IMC WFS noise contribution in arm cavity length noise | We today measured the calibration factors
for XARM_OUT and YARM_OUT in nm/cts and replotted
our results from 16117 |
|
|
16129
|
Mon May 10 18:19:12 2021 |
Anchal, Paco | Update | LSC | IMC WFS noise contribution in arm cavity length noise, Corrections | A few corrections to last analysis:
The first plot was not
IMC frequency noise but actually MC_F noise |
|
|
16132
|
Wed May 12 10:53:20 2021 |
Anchal, Paco | Update | LSC | PSL-IMC PDH Loop and XARM PDH Loop diagram | Attached is the control loop diagram when
main laser is locked to IMC and a single
arm (XARM) is locked to the transmitted light |
|
|
16228
|
Tue Jun 29 17:42:06 2021 |
Anchal, Paco, Gautam | Summary | LSC | MICH locking tutorial with Gautam | Today we went through LSC locking mechanics
with Gautam and as a "Hello World"
example, worked on locking michelson cavity. |
|
|
16232
|
Wed Jun 30 18:44:11 2021 |
Anchal | Summary | LSC | Tried fixing ETMY QPD | I worked in Yend station, trying to get
the ETMY QPD to work properly. When I started,
only one (quadrant #3) of the 4 quadrants |
|
|
16233
|
Thu Jul 1 10:34:51 2021 |
Paco, Anchal | Summary | LSC | ETMY QPD fixed | Paco worked on alignign the beam splitter
to get light on the ETMY QPD and was successful
in centering it without any other changes |
|
|
16237
|
Fri Jul 2 12:42:56 2021 |
Anchal, Paco, Gautam | Summary | LSC | snap file changed for MICH | We corrected the MICH locking snap file
C1configure_MI.req and saved an updated C1configure_MI.snap.
Now the 'Restore MICH' script in |
|
|
16241
|
Thu Jul 8 11:20:38 2021 |
Anchal, Paco, Gautam | Summary | LSC | PRFPMI locking attempts | Last night Gautam walked us through the
algorithm used to lock PRFPMI. We tried it
several times with the PSL HEPA filter off |
|
|
16247
|
Wed Jul 14 20:42:04 2021 |
gautam | Update | LSC | Locking | [paco, gautam]
we decided to give the PRFPMI lock
a go early-ish. Summary of findings today |
|
|
16248
|
Thu Jul 15 14:25:48 2021 |
Paco | Update | LSC | CM board | [gautam, paco]
We tested the CM board by implementing
the high bandwidth IR lock (single arm). |
|
|
16251
|
Mon Jul 19 22:16:08 2021 |
paco | Update | LSC | PRFPMI locking | [gautam, paco]
Gautam managed to lock PRFPMI a
little before ~ 22:00 local time. The ALS |
|
|
16261
|
Tue Jul 27 23:04:37 2021 |
Anchal | Update | LSC | 40 meter party | [ian, anchal, paco]
After our second attempt of locking
PRFPMI tonight, we tried to resotre XARM |
|
|
16264
|
Wed Jul 28 17:10:24 2021 |
Anchal | Update | LSC | Schnupp asymmetry | [Anchal, Paco]
I redid the measurement of Schnupp
asymmetry today and found it to be 3.8 cm |
|
|
16275
|
Wed Aug 11 11:35:36 2021 |
Paco | Update | LSC | PRMI MICH orthogonality plan | [yehonathan, paco]
Yesterday we discussed a bit about
working on the PRMI sensing matrix. |
|
|
16303
|
Mon Aug 30 17:49:43 2021 |
Paco | Summary | LSC | XARM POX OLTF | Used diaggui to get OLTF in preparation
for optimal system identification / calibration.
The excitation was injected at the control |
|
|
16304
|
Tue Aug 31 14:55:24 2021 |
rana | Summary | LSC | XARM POX OLTF | this model doesn't seem to include
the analog AA, analog AI, digital AA, digital
AI, or data transfer delays in the system. |
|
|
16320
|
Mon Sep 13 09:15:15 2021 |
Paco | Update | LSC | MC unlocked? | Came in at ~ 9 PT this morning to find
the IFO "down". The IMC had lost
its lock ~ 6 hours before, so at about 03:00 |
|
|
16322
|
Mon Sep 13 15:14:36 2021 |
Anchal | Update | LSC | Xend Green laser injection mirrors M1 and M2 not responsive | I was showing some green laser locking
to Tega, I noticed that changing the PZT
sliders of M1/M2 angular position on Xend |
|
|
16368
|
Thu Sep 30 14:13:18 2021 |
Anchal | Update | LSC | HV supply to Xend Green laser injection mirrors M1 and M2 PZT restored | Late elog, original date Sep 15th
We found that the power switch
of HV supply that powers the PZT drivers |
|
|
8331
|
Fri Mar 22 01:28:56 2013 |
Manasa | Update | Lasers | Beam profile of NPRO from ATF | The NPRO from ATF has been installed on
the POY table.
I have been making measurements to |
|
|
231
|
Thu Jan 10 00:12:01 2008 |
tobin | Summary | Locking | DR | [John, Tobin, Rana]
1. We found SUS_BS_SENSOR_UL to have a ratty |
|
|
313
|
Tue Feb 12 16:39:52 2008 |
rob | Update | Locking | report |
Did some locking work on DRFPMI on sunday
and (with John) on monday nights. So far |
|
|
362
|
Thu Mar 6 00:17:37 2008 |
rob | Update | Locking | DD handoff working | Got the DD (double demod) handoff scripts
working tonight, with just the DRMI. So,
now acquisition with the single demod signals |
|