 Sat Jun 16 13:01:17 2012, yuta, Update, Green Locking, scanned Y arm for 5FSR 
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Quote:
Is that time stamp really correct? |
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Sat Jun 16 18:17:00 2012, yuta, Update, Green Locking, Y arm length using 5FSR scan
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Calibrating error signal to beat frequency;
I injected 0 dBm RF sine wave into the beatbox and sweeped the frequency(just like we did in elog #6815).
This time, we have different whitening filters. I sweeped the frequency from 0 to 100 MHz in 200 sec. |
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Sat Jun 16 19:32:11 2012, yuta, Update, Green Locking, Y arm length using 5FSR scan
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I know!
But I think there's some error (~ 10% ?) in calibrating the beatbox. In elog #6815, slope
near zero crossing point is about 68 counts/MHz, but now, its 60 counts/MHz. Also, zero crossing point in elog #6815 |
 Mon Jun 18 02:31:43 2012, yuta, Summary, Green Locking, analysis of mode scan data
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I analyzed mode scan data from last week.
Mode matching ratio for Y arm is 86.7 +/- 0.3 %. Assuming
we can get rid of TEM01/10 by alignment, this can be improved up to ~ 90%. |
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Mon Jun 18 17:28:03 2012, yuta, Summary, Computers, bugs in CDS_PARTS/simLinkParts/Fcn
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Fcn module in CDS_PARTS is used to include a user defined function in a model.
We should be able to use this by entering desired function, but I found some bugs.
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Mon Jun 18 23:54:31 2012, yuta, Update, Green Locking, phase tracker for ALS
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[Koji, Jenne, Yuta]
Summary: |
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Tue Jun 19 23:36:19 2012, yuta, Update, LSC, calibrated POY error signal
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[Jenne, Yuta]
We calibrated POY error signal(C1:LSC-POY11_I_ERR). It was 1.4e12 counts/m. |
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Wed Jun 20 00:02:16 2012, yuta, Update, Green Locking, slower scan using phase tracking ALS
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For those of you who want to see plots from slower scan.
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Wed Jun 20 16:37:11 2012, yuta, Update, Locking, ETMX 1064 trans camera
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[Jenne, Yuta]
We made ETMXT camera working. |
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Wed Jun 20 18:09:23 2012, yuta, Update, Locking, both arms aligned, ITMX oplev centered
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[Jenne, Yuta]
We aligned FPMI. I also centered ITMX oplev because the light was not hitting on QPD. |
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Wed Jun 20 18:43:57 2012, yuta, Update, LSC, calibrated POX error signal
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[Jenne, Yuta]
We did the same calibration for POX. It was 3.8e12 counts/m. See elog #6834 for the details |
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Thu Jun 21 12:56:49 2012, yuta, Update, Locking, ETMX 1064 trans camera
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Quote:
[Jenne, Yuta] |
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Thu Jun 21 15:36:51 2012, yuta, Update, Locking, X arm alignment
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I aligned X arm so that the beam spot comes roughly on the center.
1. Use ITMX and ETMX (mainly ITMX) to make beam spot come on center of the optic using eyeball. |
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Fri Jun 22 10:52:18 2012, yuta, Update, Green Locking, 2 arm ALS - Success!!!!
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Answers to questions from Koji.
Are these correct? |
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Sat Jun 23 02:29:18 2012, yuta, Update, Green Locking, X arm mode scan results
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X arm finesse is 416 +/- 6, mode-matching ratio is 91.2 +/- 0.3%
I did mode scan for X arm just like we did for Y arm (see elog #6832) |
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Sat Jun 23 19:57:22 2012, yuta, Summary, Computers, c1ioo is down
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I tried to restart c1ioo becuase I can't live without him.
I couldn't ssh or ping c1ioo, so I did hardware reboot. |
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Sun Jun 24 00:10:45 2012, yuta, Update, Green Locking, current beat electronics
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I moved amplifiers for beat PD at PSL table to 1X2 rack. Current beat setup from PD to ADC is shown below. Setup for X beat and Y beat are almost the
same except for minor difference like cable kind for the delay line.
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Sun Jun 24 23:42:31 2012, yuta, Update, Computer Scripts / Programs, PMC locker
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I made a python script for relocking PMC.
It currently lives in /opt/rtcds/caltech/c1/scripts/PSL/PMC/PMClocker.py.
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Mon Jun 25 15:07:49 2012, yuta, Update, IOO, MC beam spot trend
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I adjusted MC WFS offsets using /opt/rtcds/caltech/c1/scripts/MC/WFS/WFS_FilterBank_offsets.
Beam spot positions on MC mirrors came back to where it was past few weeks. See the trend below. Trend sometimes shows huge jump, but it's just
a bad measurement caused by unlock of MC during the measurement. |
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Mon Jun 25 17:48:27 2012, yuta, Update, Computer Scripts / Programs, script for finding IR resonance using ALS
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I made a python script for finding IR resonance using ALS. It currently lives in /opt/rtcds/caltech/c1/scripts/ALS/findIRresonance.py.
The basic algorism is as follows. |
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Tue Jun 26 00:52:18 2012, yuta, Update, Computer Scripts / Programs, PMC locker
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Quote:
I thought we rewrite auto lockers once per year, but this time it took us only a month. I wrote it for PMC on May |
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Tue Jun 26 01:30:13 2012, yuta, Summary, Green Locking, simultaneous hold and release of the arm (aka two arm ALS)
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To get the feeling of the master of IFO, I;
1. Stabilized both arm length using ALS. |
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Tue Jun 26 22:37:43 2012, yuta, Update, IOO, energized OMC stages
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[Koji, Yuta]
We checked that PZTs between SRM and OMC (called OMC stage 1 and 2) is working. |
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Wed Jun 27 03:43:52 2012, yuta, Summary, IOO, how to improve mode matching to arms
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From the mode scan measurements of the arms(elog #6859), ~6% of mode-mismatch comes from 2nd-order
mode. That means we have longitudinal mismatch.
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Wed Jun 27 16:23:12 2012, yuta, Update, IOO, AS and REFL on AP table aligned
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I touched steering mirrors for AS and REFL at AP table.
AS beam and REFL beam now hits cameras at center and their respective PDs.
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Wed Jun 27 23:54:21 2012, yuta, Update, Computer Scripts / Programs, image capturing script
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Mike J. came tonight and he fixed Sensoray (elog #6645). He recompiled it and fixed it.
I made a python wrapper script for Sensoray scripts. It currently lives in /users/yuta/scripts/videocapture.py. |
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Thu Jun 28 00:50:48 2012, yuta, Update, Locking, PRMI work started, commissioning plan
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My goal for tonight was to lock PRMI,
grasp the current situation by my eye,
and capture some images using Sensoray. |
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Thu Jun 28 20:59:28 2012, yuta, Bureaucracy, Locking, vent for PRC check, TOMORROW!
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Koji, Jamie and I talked together and I decided to VENT TOMORROW MORNING.
Main purpose of this vent is to see if PRM is flipped or not.
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Fri Jun 29 01:49:36 2012, yuta, Bureaucracy, Locking, vent for PRC check, TOMORROW!
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Quote:
What do you mean by PR2, PR3 flipping? They are (supposed to be) flat mirrors, so obviously they should be installed correctly, |
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Fri Jun 29 02:17:40 2012, yuta, Update, IOO, prep for the vent - beam attenuating
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[Koji, Jamie, Yuta]
We attenuated the incident beam (1.2 W -> 11 mW) to the vacuum chamber to be ready for the vent. |
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Fri Jun 29 03:21:32 2012, yuta, Update, General, prep for the vent - others
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1. Turned off high voltage power supplies for PZT1/2 (input PZTs) and OMC stage 1/2. They live in 1Y3 rack and AUX_OMC_NORTH rack.
2. Restored all IFO optics alignment to the position where I aligned this afternoon (for SRM, I didn't aligned it; it restored at the saved value |
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Fri Jun 29 16:41:41 2012, yuta, Update, General, PRM was NOT installed backwards
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[Koji, Steve, Jamie, Yuta]
So, PRM was NOT flipped...... |
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Sun Jul 1 13:20:09 2012, yuta, Update, IOO, MC in low power
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I modified autolocker for MC in low power mode (/opt/rtcds/caltech/c1/scripts/MC/autolockMCmain40m_low_power)
to make it work with the current directory structure.
autolockMCmain40m_low_power currently runs on op340m and it is in crontab. |
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Sun Jul 1 23:48:15 2012, yuta, Summary, General, clipping at BS, my plan
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[Koji, Yuta]
We aligned PRMI and inspected BS chamber. Last inspection by Jamie and I (see elog #6897) |
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Mon Jul 2 18:27:25 2012, yuta, Update, General, BS and ITMX chambers closed
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[Koji, Steve, Jamie, Jenne, Yuta]
We opened BS and ITMX chambers, took lots of photos, and closed them with heavy doors. |
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Tue Jul 3 20:51:06 2012, yuta, Update, IOO, MC in vacuum is back
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MC came back to the state as it was before the vent.
What I did: |
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Wed Jul 4 20:13:46 2012, yuta, Bureaucracy, Locking, PRC commissioning plan
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Issues in PRC:
1. Power recycling gain is too low (~ 15 instead of 40, according to Kiwamu).
2. Mode matching to both arms are ~90%(see #6859), but PRC has terrible mode. |
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Wed Jul 4 21:11:53 2012, yuta, Update, Locking, FPMI in vacuum is back
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I aligned FPMI and greens. There's no recognizable difference between before and after the vent.
What I did: |
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Thu Jul 5 01:20:58 2012, yuta, Summary, CDS, slow computers, 0x4000 for all DAQ status
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ALS looks OK. I tried to lock FPMI using ALS, but I feel like I need 6 hands to do it with current ALS stability. Now I have all computers being so slow.
It was fine for 7 hours after Jamie the Great fixed this, but fb went down couple times and DAQ status for all models now shows 0x4000. I tried |
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Thu Jul 5 01:34:11 2012, yuta, Update, Locking, MI with X arm ALS
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I tried to lock FPMI using ALS, but I could not take care of ALS for both arms + MI. So, I decided to try one arm + MI.
I don't know why, but I couldn't make it. We need investigation.
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Thu Jul 5 13:38:05 2012, yuta, Summary, Locking, cavity g-factor from mode scan
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Cavity g-factor for X arm is 0.3737 +/- 0.002, Y arm is 0.3765 +/- 0.003.
If ITMs are flat and arm length L = 39 +/- 1 m, this means RoC of ETMX and ETMY is 62 +/- 2 m and 63 +/-
2 m respectively. |
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Fri Jul 6 01:39:56 2012, yuta, Update, Locking, MI + Y arm ALS succeed, but not both
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MI with X arm length stabilized off resonance and Y arm length stabilized at resonance using ALS succeed, but I couldn't bring X arm to IR resonance.
This maybe because of too much phase fluctuation. I will calculate it later.
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Fri Jul 6 02:46:03 2012, yuta, Update, Locking, Y arm ALS handing off to LSC
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Handing off the servo from ALS to LSC for one arm is quite easy because servo filters are pretty much same for ALS and LSC. I demonstrated it Y arm during
MI is locked.
We need DARM/CARM-kind of handing off in the near future. |
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Fri Jul 6 14:10:31 2012, yuta, Summary, LSC, calculation of FPMI using ALS
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From calculation, phase fluctuation of reflected beam from length stabilized arm is not disturbing MI lock.
Easy calculation: |
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Sun Jul 8 00:27:54 2012, yuta, Summary, Locking, calibrating phase tracking mode scan data
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FSR for X/Y arm are 3.97 +/- 0.03 MHz and 3.96 +/- 0.02 MHz respectively. This means X/Y arm lengths are 37.6 +/- 0.3 m and 37.9 +/- 0.2 m respectively.
I calibrated the mode scan results using 11MHz sideband as frequency reference. |
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Sun Jul 8 19:31:53 2012, yuta, Update, Locking, characterizing LSC arm lock by ALS error signal
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RMS of X/Y arm length using POX/POY lock is <160 pm and <120 pm respectively. RMS of free swinging X/Y arm length is both 0.17 um.
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Mon Jul 9 05:02:58 2012, yuta, Update, Locking, adjusted ALS filters, current RMS
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I adjusted filters of ALS to give more phase margin.
RMS of stabilized X/Y arm length is 97 pm and 65 pm respectively.
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Mon Jul 9 05:15:46 2012, yuta, Update, Green Locking, locked MI while ALS using ASDC
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I locked MI while both arm length are stabilized at IR resonance. This could be done using DC READOUT, in
other words, use AS_DC as MICH error signal.
Lock using RF signals are still not successful. |
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Mon Jul 9 23:18:09 2012, yuta, Update, LSC, PRMI got more stable a bit
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I modified filiters for LSC_MICH and LSC_PRCL.
Although modes we can see at POP and AS look still bad, error signals are less glitchy than I see before (elog #6886).
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Tue Jul 10 03:16:17 2012, yuta, Update, LSC, PRMI got more stable a bit
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I modified filiters for LSC_MICH and LSC_PRCL again to cope with power recycling gain fluctuation.
After some more alignment, power recycling gain increased (but still ~3.7). It fluctuates more than a factor of 2, and I began to see glitches again.
So I needed more gain margin, as Koji pointed out. |