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Fri May 9 01:36:28 2014, rana, Summary, SUS, Optical Lever QPD Sum trends: they're almost all too weak
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Mon May 12 22:42:19 2014, rana, Summary, SUS, Optical Lever QPD Sum trends: they're almost all too weak 
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Mon May 12 22:52:59 2014, Jenne, Summary, SUS, Optical Lever Filters are all different
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Tue May 13 13:27:58 2014, Steve, Summary, SUS, Optical Lever Servos setting table
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Tue May 13 17:03:05 2014, Steve, Summary, SUS, ETMX oplev laser replaced
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Tue May 13 17:31:32 2014, Jenne, Summary, SUS, ETMX oplev laser replaced: New oplev gains set 
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Tue May 13 22:55:57 2014, Jenne, Summary, SUS, ETMX oplev: cleanup
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Wed May 14 10:04:06 2014, Steve, Summary, SUS, oplev laser and temperature
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Tue May 20 09:12:25 2014, Steve, Summary, SUS, ETMX oplev qpd board  
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Tue May 20 15:54:39 2014, rana, Summary, SUS, ETMX oplev qpd board
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Message ID: 9947
Entry time: Tue May 13 17:03:05 2014
In reply to: 9946
Reply to this: 9948
9952
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Author: |
Steve |
Type: |
Summary |
Category: |
SUS |
Subject: |
ETMX oplev laser replaced |
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Quote: |
Quote: |
For some reason or another, I decided that we should see if the optical lever servos were injecting too much noise into the test masses. The ITMs are much worse than the ETMs and I am afeared that they might be making the main noise for our arms in the 20-40 Hz region. Jenne is checking up on these feedback loops to see what's up.
To estimate the actuator gains of the mirrors, I turned on 1 count drives from LSC/CAL oscillators into the LSC drives of each test mass at the frequencies shown in the plot with the resulting peaks showing up in in POX/Y with the single arm locks in red. I will leave these going permanently, but with 0.1 count ampltiudes; we need to make it so in the scripts.
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I'm in the process of filling this table
OPLEV
SERVO
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300 ^
2:0
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BR |
ELP |
RLP |
BOOST |
RES |
GAIN
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QPD
COUNTS
|
QPD
mW
|
QPD
beam
OD
|
HE/NE
output
mW
|
%
back
on QPD
|
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ETMY PIT |
FM1 |
FM5 |
|
55 |
|
|
-30 |
8,200 |
0.2 |
|
3.3 |
|
YAW |
FM1 |
FM5 |
|
55 |
|
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-28 |
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|
|
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ETMX PIT |
FM1 |
FM5 |
35 |
|
|
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4.4 |
900 |
0.2 |
|
1.7 |
|
YAW |
FM1 |
FM5 |
35 |
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2.1 |
1,750 |
0.33 |
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2.8 |
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ITMY PIT |
FM1 |
FM5 |
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|
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3.3 |
52 |
14,400 |
0.4 |
|
9.5 |
|
YAW |
FM1 |
FM5 |
|
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3.3 |
-46 |
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ITMX PIT |
FM1 |
FM5 |
50 |
|
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3.3 |
30 |
7,400 |
0.17 |
|
2.8 |
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YAW |
FM1 |
FM5 |
50 |
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3.3 |
-20 |
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BS PIT |
FM1 |
FM5 |
35 |
|
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3.3 |
9 |
2,800 |
0.05 |
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2.8 |
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YAW |
FM1 |
FM5 |
35 |
|
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3.3 |
-9 |
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PRM PIT |
FM1 |
FM5 |
55 |
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FM7 |
3.3 |
7 |
3200 |
0.06 |
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2.8 |
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YAW |
FM1 |
FM5 |
55 |
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FM7 |
3.3 |
-5 |
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SRM PIT |
FM1 |
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-20 |
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9.5 |
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YAW |
FM1 |
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20 |
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I should replace ETMX He/Ne laser
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