| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
9161
|
Wed Sep 25 23:15:11 2013 |
Masayuki | Summary | Green Locking | FPMI noise caused by ARM locking | I measured some error signal, OLTFs and
responses for FPMI noise estimation. Especially
we are interested in the noise from in-loop |
|
|
9162
|
Wed Sep 25 23:59:29 2013 |
Masayuki | Summary | Green Locking | FPMI noise caused by ARM locking |
Measurement |
|
|
9163
|
Thu Sep 26 01:49:28 2013 |
Masayuki | Summary | Green Locking | FPMI noise caused by ARM locking |
Measurement |
|
|
9170
|
Fri Sep 27 16:02:23 2013 |
manasa | Update | Green Locking | Y arm ALS phase tracking loop gain changed | [Masayuki, Manasa]
While trying to lock the arms using
ALS we found that the locks were not very |
|
|
9171
|
Fri Sep 27 20:28:10 2013 |
manasa | Update | Green Locking | ALS servo | [Masayuki, Manasa]
I. ALS servo loops
After fixing things with the phase |
|
|
9176
|
Mon Sep 30 17:55:45 2013 |
manasa | Update | Green Locking | X and Y arm transmission needs to be decoupled | [Masayuki, Manasa]
Problem
We wanted to lock both the arms using |
|
|
9178
|
Mon Sep 30 23:56:19 2013 |
manasa | Update | Green Locking | ALS autolocker flowchart | [Masayuki, Manasa]
Flowchart for ALS autolocker. The
error signal thresholds will be decided by |
|
|
9179
|
Tue Oct 1 09:51:10 2013 |
rana | Update | Green Locking | ALS autolocker flowchart | I think we can use the IMC
autolocker to start with getting this started.
Once Jamie fixes the NDSSERVER environment |
|
|
9183
|
Tue Oct 1 17:14:53 2013 |
masayuki | Update | Green Locking | ALS servo filters modified |
[Manasa, Masayuki]
|
|
|
9195
|
Thu Oct 3 09:01:06 2013 |
manasa | Update | Green Locking | ALS high frequency noise | As I was trying to solve the 2 arm
ALS problem, I found the Y arm ALS not so
stable AGAIN :( . I measured the in-loop |
|
|
9197
|
Thu Oct 3 10:29:03 2013 |
masayuki | Update | Green Locking | New ALS autolocker flowchart |
[Manasa, Masayuki]
We made a new flowchart of ALS autolocker. |
|
|
9198
|
Thu Oct 3 13:54:25 2013 |
manasa | Update | Green Locking | ALS out-of loop noise | We found the PDH servo gain for Y arm green
was set at 2 (too low). The gain was set
to 8.6 (based on earlier OLTF measurement |
|
|
9199
|
Thu Oct 3 22:14:06 2013 |
Masayuki | Update | Green Locking | Both arms ALS stabilized for IR resonance | [Manasa, Masayuki]
We |
|
|
9200
|
Fri Oct 4 01:09:33 2013 |
Manasa | Update | Green Locking | Frequency counter for ALS | I checked the BK precision 1856D manual.
I found that although this frequency counter |
|
|
9201
|
Fri Oct 4 02:08:32 2013 |
Masayuki | Update | Green Locking | FPMI with ALS arm stabilization | [Manasa, Masayuki]
We locked MICH with 2 arms stabilized
by ALS control. |
|
|
9204
|
Fri Oct 4 20:25:12 2013 |
Masayuki | Update | Green Locking | ALS down script | I wrote the down script for ALS. This script
is
(script)/ALS/ALSdown.py When |
|
|
9219
|
Tue Oct 8 00:21:01 2013 |
manasa | HowTo | Green Locking | ALS arm stabilization | Step by
step procedure for stabilizing arms using
ALS servo |
|
|
9226
|
Wed Oct 9 18:45:17 2013 |
Masayuki | Update | Green Locking | ALS down script modified |
|
|
|
9228
|
Wed Oct 9 22:58:34 2013 |
Manasa | Update | Green Locking | ALS stabilization | After Jenne and Masayuki told that they
were not able to stabilize the ALS for either
arms yesterday, I looked into things with |
|
|
9232
|
Fri Oct 11 00:37:21 2013 |
Masayuki | Update | Green Locking | Y-arm ALS | [Manasa, Masayuki]
-
Motivation |
|
|
9233
|
Fri Oct 11 00:37:23 2013 |
manasa | Update | Green Locking | X arm green locking modes | [Masayuki, Manasa]
We have stabilized the ALS for Y
arm and concluded that although the PDH servo |
|
|
9240
|
Tue Oct 15 01:39:07 2013 |
Masayuki | Update | Green Locking | Y-arm ALS |
- Motivation |
|
|
9242
|
Wed Oct 16 02:08:05 2013 |
Masayuki | Update | Green Locking | Script for scan cavity. | I wrote the script to scan the cavity using
ALS until it finds IR resonance . This script
is |
|
|
9248
|
Wed Oct 16 19:19:14 2013 |
Masayuki | Update | Green Locking | End PDH 60 Hz comb noise in YARM | [Manasa, Masayuki]
- Motivation |
|
|
9258
|
Tue Oct 22 11:58:16 2013 |
Masayuki | Update | Green Locking | Yarm ALS PDH | [Manasa, Masayuki]
Purpose
As this |
|
|
9261
|
Wed Oct 23 00:13:30 2013 |
Masayuki | Update | Green Locking | FPMI with ALS arm stabilization | Summary
In 2arms + MICH configuration, residual |
|
|
9273
|
Thu Oct 24 04:07:32 2013 |
Masayuki | Update | Green Locking | End PDH control signal, X-end PDH servo gain optimization | Control signal measurement of end PDH
control
The Yarm ALS wasn't robust. Yesterdays |
|
|
9283
|
Thu Oct 24 19:12:45 2013 |
Masayuki | Update | Green Locking | ALS OFFSETTER calibration | I calibrated the ALS-OFFSETTER output.
I measured the FSR of cavity in unit |
|
|
9284
|
Thu Oct 24 21:46:18 2013 |
Koji | Update | Green Locking | ALS OFFSETTER calibration |
|
|
|
9442
|
Wed Dec 4 21:41:09 2013 |
ericq | Update | Green Locking | Green PDH Characterization | My job right now is to characterize
the green PDH loops on each arm. Today, Jenne
took me around and pointed at the optics |
|
|
9447
|
Fri Dec 6 12:45:51 2013 |
ericq | Update | Green Locking | Green PDH Characterization | Yesterday, made a slew of measurements
on the X-arm when locked on green. By tweaking
the temperature loop offset and the green |
|
|
9455
|
Thu Dec 12 00:21:04 2013 |
Koji | Update | Green Locking | X end PDH box oscillation issue solved (Re: screwed up the end PDH box) | What
a such long pain we suffered.
After more than three years from |
|
|
9459
|
Thu Dec 12 21:23:15 2013 |
ericq | Update | Green Locking | Better Xarm OLTF | With the newly repaired PDH board, I spent
some time with the x arm green PDH loop.
I found it SO MUCH EASIER to measure the |
|
|
9461
|
Thu Dec 12 22:12:17 2013 |
Koji | Update | Green Locking | Better Xarm OLTF | OK, the next question will be "why
the loop bandwidth is so miserable?"
|
|
|
9464
|
Fri Dec 13 11:47:11 2013 |
Gabriele | Update | Green Locking | Better Xarm OLTF | I'm not as good as a fit,
but it seems that there is a loop delay of
about 30 microseconds, looking at the high |
|
|
9496
|
Thu Dec 19 19:45:12 2013 |
ericq | Update | Green Locking | X-Arm Green PDH Loop Stuff | With the fixed servo box, I remeasured the
OLTF, the servo, and the low pass filter
between the mixer output and servo input. |
|
|
9592
|
Mon Feb 3 15:57:52 2014 |
Steve | Update | Green Locking | ETMX green power | There was 0.2 mW green at the X end.
The doubling oven temp was changed
from 37.5 to 36 degrees C |
|
|
9595
|
Tue Feb 4 01:02:03 2014 |
Koji | Update | Green Locking | ETMX green power | Manasa, Steve: Please revisit the Xend
oven temperature again.
|
|
|
9621
|
Mon Feb 10 22:21:55 2014 |
manasa | Update | Green Locking | X and Y arm green tuned | Y arm green: Nothing
much was disturbed. I touched the steering
mirrors and brought |
|
|
9624
|
Tue Feb 11 21:22:02 2014 |
manasa | Update | Green Locking | ALS X and Y arm restored | The X and
Y arms were locked successfully using ALS |
|
|
9625
|
Tue Feb 11 22:17:06 2014 |
Koji | Update | Green Locking | ALS X and Y arm restored | Nice restoration. We eventually want to
make transition of the servo part from ALS
to LSC model for the further handing off |
|
|
9633
|
Thu Feb 13 16:48:33 2014 |
Steve | Update | Green Locking | X and Y arm green tuned details |
|
|
|
9665
|
Mon Feb 24 17:21:42 2014 |
Steve | Update | Green Locking | green fiber status today |
|
6x |
|
9721
|
Tue Mar 11 19:38:26 2014 |
manasa | Update | Green Locking | ALS Slow servo settings |
|
|
|
9727
|
Fri Mar 14 10:31:10 2014 |
jamie | Update | Green Locking | ALS Slow servo settings |
|
|
|
9837
|
Mon Apr 21 23:33:57 2014 |
rana | Summary | Green Locking | HP 8591E reads low by 140 Hz out of 10 MHz | To
check the basolute frequency stability of
the old monochrome HP 8591E RF Spectrum analyzer |
|
|
9937
|
Fri May 9 11:23:11 2014 |
steve | Update | Green Locking | decreased X green light power | Green light power decreased from 3 mW to
1 mW at the ETMX-ISCT shutter. More later. |
|
|
9939
|
Fri May 9 21:18:51 2014 |
Koji | Update | Green Locking | Reverted X green light power | It is actually very tricky to measure the
green power at the output of the doubling
crystal as the IR often leaks into the measurement. |
|
|
9990
|
Fri May 23 11:58:28 2014 |
manasa | Update | Green Locking | Y arm green alignment tuned | The Y arm green transmission had come down
to 0.3 and the green steering mirrors on
the Y end table required some minor alignment |
|
|
10396
|
Thu Aug 14 22:58:59 2014 |
rana, jenne | Summary | Green Locking | ALS DIFF tuning | We've been having trouble tuning
the ALS DIFF matrix. Trying to see if the
MC2 EXC can be cancelled in ALS DARM by adjusting |
|