| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
5956
|
Sat Nov 19 00:47:24 2011 |
Zach | Update | Green Locking | Y-Arm locked with PDH Box #17 | I installed the newly modified PDH |
|
|
12188
|
Thu Jun 16 11:25:00 2016 |
Johannes | Update | LSC | Y-Arm round-trip loss measurement with ALS | Using the ALS green beat and armlength
feedback I mapped an IR resonance of the
Y-Arm by stepping through a ramp of offset |
|
|
4435
|
Wed Mar 23 19:16:17 2011 |
Aidan | Summary | Green Locking | Y-END green equipment is all available | With the exception of a 2" mirror
mount, I've confirmed that we have everything
for the Y-end green production and mode-matching. |
|
|
4436
|
Thu Mar 24 01:16:19 2011 |
Suresh | Summary | Green Locking | Y-END green equipment is all available | There was a 2" mirror mount among the spares
on the PSL table. It has a window LW-3-2050
UV mounted in it. I
|
|
|
9232
|
Fri Oct 11 00:37:21 2013 |
Masayuki | Update | Green Locking | Y-arm ALS | [Manasa, Masayuki]
-
Motivation |
|
|
9240
|
Tue Oct 15 01:39:07 2013 |
Masayuki | Update | Green Locking | Y-arm ALS |
- Motivation |
|
|
14738
|
Tue Jul 9 18:06:05 2019 |
gautam | Update | LSC | Y-arm ASS in a workable state | The Y-arm ASS was tuned to be in a workable
state. Basically, I followed Koji's recipe. |
|
|
9054
|
Thu Aug 22 20:25:28 2013 |
Masayuki | Summary | Green Locking | Y-arm PDH OLTF measurement | [Manasa, Masayuki]
We measured the the openloop transfer
function of the PDH green lock of the y-arm.The |
|
|
12884
|
Mon Mar 13 16:47:41 2017 |
Steve | Update | PEM | Y-arm air conditon belts replaced | The east end AC unit is arching over and
running rough at CES. Called for mechanic.......
Both belts were replaced and the |
|
|
13048
|
Wed Jun 7 14:11:49 2017 |
gautam | Update | ASS | Y-arm coil driver electronics investigation | Rana suggested taking a look at the Y-arm
test mass actuator TFs (measured by driving
the coils one at a time, with only local |
|
|
13051
|
Wed Jun 7 17:45:11 2017 |
gautam | Update | ASS | Y-arm coil driver electronics investigation | I repeated the test of driving C1:SUS-<Optic>_<coil>_EXC
individually and measuring |
|
|
13052
|
Thu Jun 8 02:11:28 2017 |
gautam | Update | ASS | Y-arm coil driver electronics investigation |
p.p1
{margin: 0.0px 0.0px 0.0px 0.0px; font: 18.0px
'Helvetica Neue'; -webkit-text-stroke: #000000}
p.p3 |
|
|
9164
|
Thu Sep 26 10:55:29 2013 |
Steve | Update | General | Y-arm floor space for test | Liyuon will set up a ~5 mW He/Ne
laser for waist measurement |
|
|
11879
|
Mon Dec 14 16:27:11 2015 |
gautam | Update | Green Locking | Y-end AUX PDH noise breakdown | Summary:
I've
attached the results from my measurements |
|
|
11907
|
Mon Jan 4 16:45:11 2016 |
gautam | Update | Green Locking | Y-end AUX PDH noise breakdown | Summary:
I've
re-measured the noise breakdown for the Y-end |
|
|
8817
|
Wed Jul 10 01:27:44 2013 |
gautam | Update | Green Locking | Y-end Green PDH open-loop transfer function | [Annalisa, gautam]
Summary:
We have measured the open-loop transfer |
|
|
14943
|
Sat Oct 5 21:26:34 2019 |
gautam | Update | ALS | Y-end green alignment tweaked | Summary:
I improved the alignment of the
green beam into the Y arm cavity. |
|
|
4994
|
Wed Jul 20 06:17:04 2011 |
Suresh | Update | Green Locking | Y-end green laser power issues | The Y-end green beam power is 0.47 mW.
While
aligning the Y-end aux laser light into the
fiber we noticed that the green power out |
|
|
14230
|
Thu Oct 4 22:15:30 2018 |
yuki | Configuration | ASC | Y-end table upgrade | Before changing setup at Y-end table, I
measured the status value of the former setup
as follows. These values will be compared |
|
|
14231
|
Fri Oct 5 00:46:17 2018 |
Koji | Configuration | ASC | Y-end table upgrade | ???
The SHG crystal has the conversion
efficiency of ~2%W (i.e. if you have 1W input |
|
|
14232
|
Fri Oct 5 17:32:38 2018 |
yuki | Configuration | ASC | Y-end table upgrade | I measured it with the wrong setting of
a powermeter. The correct ones are here:
beam power going into doubling |
|
|
14233
|
Fri Oct 5 17:47:55 2018 |
gautam | Configuration | ASC | Y-end table upgrade | What
about just copying the Xend |
|
|
14234
|
Fri Oct 5 22:49:22 2018 |
yuki | Configuration | ASC | Y-end table upgrade | I designed a new layout. It has good mode-matching
efficiency, reasonable sensitivity to component
positions, good Gouy phase separation. I'm |
|
|
14237
|
Mon Oct 8 00:46:35 2018 |
yuki | Configuration | ASC | Y-end table upgrade |
Quote:
|
|
|
5625
|
Thu Oct 6 15:37:26 2011 |
Jenne | Update | Green Locking | Y-green Mech Shutter Button | [Katrin, Jenne]
We were poking around and tried to
make a button for the Y-green shutter, just |
|
|
5181
|
Thu Aug 11 02:16:57 2011 |
Jenne | Update | Green Locking | Y-green aligned and flashing | [Jenne, with ample supervision by Kiwamu
and Suresh]
Y-green was aligned, and is now flashing. |
|
|
6234
|
Fri Jan 27 16:55:28 2012 |
Jenne | Update | Green Locking | Y-green realigned | The Yarm green laser really wanted to lock
on a 01/10 mode, so Kiwamu suggested I go
inside and realign the green beam to the |
|
|
7764
|
Fri Nov 30 02:40:44 2012 |
Den | Update | Adaptive Filtering | YARM | I've applied FIR adaptive filter to YARM
control. Feedback signal of the closed loop
was used as adaptive filter error signal |
|
|
7767
|
Fri Nov 30 11:49:24 2012 |
Koji | Update | Adaptive Filtering | YARM | This is interesting. I suppose you are
acting on the ETMY.
Can you construct the compensation |
|
|
8552
|
Wed May 8 18:33:02 2013 |
Koji | Update | ASS | YARM ASS - faster and more precise convergence | Precise arm alignment is more demanded.
as the PRMI locking requires good and reliable
alignment of the ITMs. |
|
|
7211
|
Fri Aug 17 00:16:30 2012 |
Eric | Summary | LSC | YARM Calibration | I modified my Simulink model of the YARM
to match the new filter modules Rana installed
on YARM. I also scaled the open loop transfer |
|
|
7128
|
Thu Aug 9 00:14:02 2012 |
Eric | Summary | Locking | YARM Locking and Calibration | Today I spent time locking the YARM
in order to calibrate the arm cavity. Here's |
|
|
7130
|
Thu Aug 9 00:35:53 2012 |
Jenne | Summary | Locking | YARM Locking and Calibration |
|
|
|
7134
|
Thu Aug 9 10:09:32 2012 |
Eric | Summary | Locking | YARM Locking and Calibration |
|
|
|
7139
|
Fri Aug 10 09:51:51 2012 |
Eric | Summary | Locking | YARM Locking and Measurements | I forgot to post this last night, but I
locked the YARM again yesterday and misaligned
the other optics. I took measurements on |
|
|
5742
|
Wed Oct 26 11:35:08 2011 |
Katrin | Update | Green Locking | YARM PDH box | |
|
|
5726
|
Fri Oct 21 16:59:14 2011 |
Katrin | Update | Green Locking | YARM PDH box broken | I could not improve the locking. So, I
checked the transfer function of the PDH
box again. The transfer function looks okay |
|
|
17453
|
Mon Feb 6 20:44:34 2023 |
Anchal | Update | ASC | YARM WFS First Attempt - Success | I uploaded this measured output matrix
to the YARM WFS model:
|
|
|
17454
|
Tue Feb 7 11:12:44 2023 |
rana | Update | ASC | YARM WFS First Attempt - Success | It would be great if you could calibrate
these ASC channels into physical units (e.g.
urad or nrad). I am curious to see how the |
|
|
17456
|
Wed Feb 8 12:25:42 2023 |
Anchal | Update | ASC | YARM WFS Loop Step Response | I did a quick step response test today
with YARM WFS loops running. Steps were put
in as offsets in channels C1:SUS-I/ETMY_ASCPIT/YAW_OFFSET |
|
|
17140
|
Thu Sep 15 11:13:32 2022 |
Anchal | Summary | ASS | YARM and XARM ASS restored | With limited proof of working for a few
times (but robustly), I'm happy to report
that ASS on YARM and XARM is working now. |
|
|
11504
|
Thu Aug 13 23:57:33 2015 |
Ignacio | Update | LSC | YARM coherence plots | I took data
from 1123495750 to 1123498750 GPS
time (Aug 13 at 3AM, 50 mins of data) for |
|
|
5846
|
Wed Nov 9 12:05:08 2011 |
Katrin | Update | Green Locking | YARM error signal and feedback signal | error signal = signal measured behind the
low-pass filter
feedback signal = output of the gain |
|
|
5837
|
Mon Nov 7 17:38:18 2011 |
Katrin | Update | Green Locking | YARM length fluctuation | |
|
|
5769
|
Mon Oct 31 14:01:56 2011 |
Katrin | Update | Green Locking | YARM locks for 2h | Today, I could lock the YARM laser for
2h to the YARM cavity. After to hours the
output of the servo is saturated. I need |
7x |
|
12524
|
Thu Sep 29 20:21:29 2016 |
Johannes | Update | General | YARM loss measurement | [Gautam, Johannes]
I scripted a series of YARM DC
reflectivity measurements last night alternating |
|
|
11472
|
Thu Jul 30 19:12:52 2015 |
Ignacio | Update | IOO | YAW and PIT WFS Wiener filtering | Rana pointed out that another way to mitigate
seismic motion at in the mode cleaner would
be to look at the YAW and PITCH output channels |
|
|
12175
|
Tue Jun 14 11:29:25 2016 |
Johannes | Summary | ASC | YArm OpLev Calibration | In preparation for the armloss map I checked
the calibration of the Y-Arm ITM and ETM
OpLevs with the method originally described |
|
|
17350
|
Fri Dec 9 10:08:54 2022 |
Radhika | Update | ASC | YEND green alignment chronicles | Today I set out to align and lock the
YEND green laser, and observe the expected
PDH error signal and PZT control signal. |
|
|
7643
|
Wed Oct 31 01:06:31 2012 |
Den | Update | Alignment | Yarm |
Jenne, Den
We looked at beam spots on ITMY and |
|