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40m Log |
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Wed Sep 6 01:09:11 2017, johannes, Update, Computer Scripts / Programs, New set of loss measurements 
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Mon Sep 11 12:56:40 2017, johannes, Update, Computer Scripts / Programs, lossmap attempts
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Mon Sep 11 16:46:09 2017, Steve, Update, PEM, earthquakes
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Tue Sep 19 14:00:41 2017, Steve, Update, PEM, earthquakes
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Fri Oct 27 09:34:20 2017, Steve, Update, PEM, earthquakes
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Fri Nov 10 13:46:26 2017, Steve, Update, PEM, M3.1 local earthquake
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Mon Apr 9 08:39:39 2018, Steve, Update, PEM, M5.3 eq Souther CA  
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Thu Jan 25 08:27:25 2018, Steve, Update, PEM, earthquakes  
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Mon Sep 25 17:56:33 2017, johannes, Update, Computer Scripts / Programs, transmitted power during lossmap
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Thu Oct 11 13:40:51 2018, yuki, Update, Computer Scripts / Programs, loss measurements
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Fri Oct 12 12:29:34 2018, yuki, Update, Computer Scripts / Programs, loss measurements
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Fri Oct 12 20:20:29 2018, yuki, Update, Computer Scripts / Programs, loss measurements
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Sat Oct 13 20:11:10 2018, yuki, Update, Computer Scripts / Programs, loss measurements
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Mon Oct 15 10:32:13 2018, yuki, Update, Computer Scripts / Programs, loss measurements 
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Tue Oct 16 00:44:29 2018, yuki, Update, Computer Scripts / Programs, loss measurements
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Fri Nov 2 19:25:16 2018, gautam, Update, Computer Scripts / Programs, loss measurements
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Mon Oct 15 12:52:54 2018, yuki, Update, Computer Scripts / Programs, additional comments
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Fri Nov 2 16:42:31 2018, aaron, Update, Computer Scripts / Programs, arm loss measuremenents
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Mon Nov 5 13:52:18 2018, aaron, Update, Computer Scripts / Programs, arm loss measuremenents
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Tue Nov 6 10:19:26 2018, aaron, Update, Computer Scripts / Programs, arm loss measuremenents
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Tue Nov 6 15:23:48 2018, gautam, Update, IOO, IMC problematic
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Tue Nov 6 19:02:35 2018, aaron, Update, IOO, IMC problematic
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Sat Nov 10 17:40:00 2018, aaron, Update, IOO, IMC problematic
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Mon Nov 12 13:53:20 2018, rana, Update, IOO, loss measurement: oscope vs CDS DAQ
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Thu Nov 15 10:21:07 2018, aaron, Update, IOO, IMC problematic 
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Fri Nov 16 10:53:07 2018, aaron, Update, IOO, IMC problematic
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Sat Nov 17 18:59:01 2018, aaron, Update, IOO, IMC problematic
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Wed Nov 7 05:16:16 2018, yuki, Update, Computer Scripts / Programs, arm loss measuremenents
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Message ID: 14243
Entry time: Thu Oct 11 13:40:51 2018
In reply to: 13299
Reply to this: 14245
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Author: |
yuki |
Type: |
Update |
Category: |
Computer Scripts / Programs |
Subject: |
loss measurements |
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Quote: |
This is the procedure I follow when I take these measurements for the XARM (symmetric under XARM <-> YARM):
- Dither-align the interferometer with both arms locked. Freeze outputs when done.
- Misalign ETMY + ITMY.
- ITMY needs to be misaligned further. Moving the slider by at least +0.2 is plentiful to not have the other beam interfere with the measurement.
- Start the script, which does the following:
- Resume dithering of the XARM
- Check XARM dither error signal rms with CDS. If they're calm enough, proceed.
- Freeze dithering
- Start a new set of averages on the scope, wait T_WAIT (5 seconds)
- Read data (= ASDC power and MC2 trans) from scope and save
- Misalign ETMX and wait 5s
- Read data from scope and save
- Repeat desired amount of times
- Close the PSL shutter and measure the PD dark levels
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Information for the armloss measurement:
- Script which gets the data: /users/johannes/40m/armloss/scripts/armloss_scope/armloss_dcrefl_asdcpd_scope.py
- Script which calculates the loss: /users/johannes/40m/armloss/scripts/misc/armloss_AS_calc.py
- Before doing the procedure Johannes wrote you have to prepare as follows:
- put a PD in anti-symmetric beam path to get ASDC signal.
- put a PD in MC2 box to get tranmitted light of IMC. It is used to normalize the beam power.
- connect those 2 PDs to oscilloscope and insert an internet cable to it.
- Usage: python2 armloss_dcrefl_asdcpd_scope.py [IP address of Scope] [ScopeCH for AS] [ScopeCH for MC] [Num of iteration] [ArmMode]
Note: The scripts uses httplib2 module. You have to install it if you don't have.
The locked arms are needed to calculate armloss but the alignment of PMC is deadly bad now. So at first I will make it aligned. (Gautam aligned it and PMC is locked now.)
gautam: The PMC alignment was fine, the problem was that the c1psl slow machine had become unresponsive, which prevented the PMC length servo from functioning correctly. I rebooted the machine and undid the alignment changes Yuki had made on the PSL table. |