 Thu Nov 11 04:32:53 2010, yuta, Summary, CDS, found poor contact of DAC cable, previous A2L results were wrong
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(Koji, Jenne, Yuta)
We found one of DAC cables had a poor contact. |
Thu Nov 11 05:56:04 2010, yuta, Summary, IOO, setting up temporary oplev for coil balancing of MCs 
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(Suresh, Yuta)
Background: |
 Fri Nov 12 06:10:24 2010, yuta, Update, IOO, MC aligned (without coil balancing)
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Background:
Last night, we found that one of DAC channels are poorly connected, so we fixed the connectors.
Rana and Koji used their incredible eyeballs to roughly align MC. |
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Sat Nov 13 15:53:05 2010, yuta, Update, CDS, diagonalization of MC input matrix
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Motivation:
MC is aligned from the A2L measurement, but to do the beam centering more precisely, we need coils to be balanced.
There are several ways to balance the coils, like using oplev or WFS QPD RF channels. |
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Tue Nov 16 03:33:22 2010, yuta, Update, IOO, aligned Faraday, beam reached SM just before PRM
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(Koji, Yuta)
We aligned the Faraday after MC and we are now ready to install PRM. |
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Wed Nov 17 02:53:41 2010, yuta, Update, IOO, placed new PRM to BS table
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(Kiwamu, Yuta)
Background: |
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Wed Nov 17 20:44:59 2010, yuta, Summary, CDS, no QPD channels on c1sus machine today
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(Joe, Suresh, Yuta)
Currently, only 2 ADC cards work on c1sus machine. |
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Thu Nov 18 00:40:31 2010, yuta, Update, IOO, PRM reflected beam reached AP table
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(Kiwamu, Yuta)
Summary: |
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Thu Nov 18 16:32:21 2010, yuta, Summary, CDS, current damping status for all optics c1sus handles
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Summary:
I set Q-values for each ringdown of PRM, BS, ITMX, ITMY, MC1, MC2, MC3 to ~5 using QAdjuster.py.
Here are the results; |
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Fri Nov 19 17:12:22 2010, yuta, Update, CDS, ETMX damped, but with weird TO_COIL matrix
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Background:
c1iscex machine is currently being setup and RT model c1scx is running.
But ETMX(south) didn't seem to be damped, so I checked it. |
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Sat Nov 20 01:58:56 2010, yuta, HowTo, CDS, editting RT models and MEDM screens
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(Suresh, Yuta)
If you come up with a good idea and want to add new things to current RT model; |
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Sat Nov 20 02:25:30 2010, yuta, Update, CDS, 2 LOCKINs for suspension models
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(Suresh, Koji, Yuta)
Background: |
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Sat Nov 20 03:37:11 2010, yuta, Summary, CDS, CDS time delay measurement - the ripple
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(Koji, Joe, Yuta)
Motivation: |
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Mon May 21 21:27:39 2012, yuta, Update, CDS, MEDM suspension screens using macro
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Background:
We need more organized MEDM screens. Let's use macro.
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Tue May 22 20:46:38 2012, yuta, Update, CDS, MEDM suspension screens using macro
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I fixed the problem Jamie pointed out in elog #6657 and #6659.
What I did: |
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Thu May 24 16:13:05 2012, yuta, Update, Computers, ASS scripts on new ubuntu machines
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[Den, Yuta]
Background: |
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Tue May 29 21:05:30 2012, yuta, Update, IOO, PMC, MC alignment are shit
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Quote:
[Keiko, Jenne] |
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Wed May 30 01:35:15 2012, yuta, Update, Green Locking, aligned Y arm green beam
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[Jenne, Yuta]
We aligned the Y arm for IR (C1:LSC-TRY_OUT is now ~ 0.9), and aligned the green beam from the ETMY table. The Y arm green is now resonating in
TEM00 mode, but we need some monitors (green trans or green refl) to maximize the coupling. |
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Wed May 30 15:51:22 2012, yuta, Update, IOO, MC beam spot oscillation
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[Koji, Suresh, Jenne, Yuta]
Background:
We noticed that the beam spots on MC mirrors are oscillating in ~ 1 Hz yesterday. It means MC mirrors are actually oscillating. This was |
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Wed May 30 19:27:38 2012, yuta, Update, IOO, MC beam spot oscillation
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[Koji, Yuta]
We found that C1:SUS-MC{1,2,3}_TO_COIL_3_4_GAIN was somehow changed to -1, and feedback signal
for SIDE was fedback to LLCOIL, which is apparently not correct. |
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Thu May 31 01:27:16 2012, yuta, Update, Green Locking, PSL and Y arm green beams aligned
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[Jenne, Yuta]
We aligned the PSL green optics so that the PSL green beam and Y arm green beam interfere. 2 beams are now hitting the Y arm beat PD. The DC level
from the beat PD is about 13 mV. |
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Thu May 31 01:36:17 2012, yuta, Update, Green Locking, GREEN_TRX/GREEN_TRY PDs
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I did the cabling for monitoring DC transmission of the green beam from the end table.
The two PDs are called GREEN TRX and GREEN TRY, and the channel names are C1:GCV-GREEN_TRX and C1:GCV-GREEN_TRY.
The two signal from the PDs go to the ADC_0 card of the c1ioo computer. |
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Thu May 31 02:27:24 2012, yuta, Update, IOO, script for reliefing MC WFS
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I wrote a simple script for reliefing MC WFS servo. The script is located at /opt/rtcds/caltech/c1/scripts/MC/reliefMCWFS.
It simply uses ezcaservo to minimize the offset of the WFS feedback signal using MC alignment sliders.
ezcaservo -r C1:SUS-MC${optic}_ASC${dof}_OUT16 -s 0 -g 0.0001 -t 10 C1:SUS-MC${optic}_${dof}_COMM
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Thu May 31 04:03:17 2012, yuta, Update, IOO, script for MC beam spot measurement
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I wrote a wrapping script for measuring MC beam spot. We had to run several scripts for the measurement (see elog #6688),
but now, you only need to run /opt/rtcds/caltech/c1/scripts/ASS/MC/mcassMCdecenter.
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Thu May 31 16:19:07 2012, yuta, Update, Green Locking, temperature setting for PSL doubling crystal
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I fixed the temperature control of the oven for the PSL doubling crystal.
The PID settings were not good, and also, TC200 was beging DETUNED. So, I activated TUNE function and adjusted PID settings.
I'm not sure what the DETUNE function is for. The manual can be found here; |
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Sat Jun 2 03:19:37 2012, yuta, Update, Green Locking, Y green beat note found? - too small
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Summary:
I tried to find Y arm green beat in order to do the mode scan.
I found a beat peak(see attached picture), but the amplitude seems too small. |
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Tue Jun 5 21:09:40 2012, yuta, Update, Computer Scripts / Programs, hacked ezca tools
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Currently, ezca tools are flakey and fails too much.
So, I hacked ezca tools just like Yoichi did in 2009 (see elog #1368).
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Wed Jun 6 02:28:02 2012, yuta, Update, Green Locking, tried to see Yarm length change with weak beat note
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[Jenne, Yuta]
Summary: |
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Wed Jun 6 15:16:00 2012, yuta, Update, IOO, MC WFS offsets adjusted
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MC reflection (C1:IOO-MC_RFPD_INMON) got worse when WFS servos were on. After aligning MC optics, it will be ~0.5 but if I turned on WFS, it became ~0.8.
I measured the beam spot positions on MC optics. They seemed like the same from the measurement yesterday.
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Wed Jun 6 21:11:45 2012, yuta, Update, Green Locking, improved Y arm green alignment
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Summary:
Y arm green transmission to the PSL table improved from ~ 20 uW to 61 uW. Improvement was done by adjusting steering mirrors before and after
the faraday on the Y end table. |
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Thu Jun 7 01:46:05 2012, yuta, Summary, Green Locking, Y green beat - found it!!
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I found the big big Y green beat. Details will be posted later.
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Thu Jun 7 02:25:27 2012, yuta, Update, Green Locking, improved Y arm green alignment - even more
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[Koji, Yuta]
Summary: |
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Thu Jun 7 02:59:31 2012, yuta, Update, Green Locking, Y green beat - found it!!
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Summary:
I found the big green beat note for the Y arm. The alignment of the green optics on the PSL table was crappy.
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Thu Jun 7 03:37:26 2012, yuta, Update, CDS, mx_stream restarted on c1lsc, c1ioo
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c1lsc and c1ioo computers had FB net statuses all red. So, I restarted mx_stream on each computer.
ssh controls@c1lsc
sudo /etc/init.d/mx_stream restart |
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Thu Jun 7 05:39:41 2012, yuta, Update, Green Locking, coarsely stabilized Y arm length with ALS
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I coarsely stabilized Y arm length to off resonance point for IR using ALS.
Currently, ASL servo loop is unstable and oscillates so much that I can't hold the length to the resonance point.
We need more investigation on the servo loop before doing the mode scan. |
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Thu Jun 7 18:46:13 2012, yuta, Update, SUS, PRM oplev centered
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PRM oplev beam was not hitting on the QPD since Jun 1, so I centered it. I reverted the oplev servo gains and now oplev servo looks fine.
C1:SUS-PRM_OLPIT_GAIN = 1.0 |
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Fri Jun 8 15:08:27 2012, yuta, Update, Green Locking, aligned/mode-matched Y green beat setup
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Laser temperature settings for Y arm green work today are;
PSL laser temperature on display: 31.38 deg C (PSL HEPA 100%) |
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Mon Jun 11 21:50:08 2012, yuta, Update, Green Locking, beatbox looks OK
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Summary:
We need I-Q frequency deiscriminator to control the arm length fine and continuously.
I checked the beatbox (LIGO-D1102241-v4; see elog #6302) and it was working. |
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Tue Jun 12 01:58:33 2012, yuta, Update, Green Locking, aligned Y arm to Y end green
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[Jenne, Yuta]
We aligned Y arm to the Y end green incident beam. |
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Tue Jun 12 20:35:46 2012, yuta, Update, Green Locking, c1gcv recompiled
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[Jamie, Yuta]
We recompiled c1gcv because the order of the channels were confusing. We found some change in the phase rotation module when we did this. |
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Tue Jun 12 23:18:18 2012, yuta, Update, Green Locking, I-Q signals for the beat
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[Mengyao, Yuta]
Yes!! We have I-Q signals for the beat!! |
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Wed Jun 13 02:11:59 2012, yuta, Update, Green Locking, my first modescan (sort of)
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I stabilized Y arm length by using only I phase coarse signal from the beat(C1:ALS-BEATY_COARSE_I_ERR).
I sweeped the arm length by injecting 0.05Hz sine wave from C1:ALS_OFFSETTER2_EXC.
Below is the plot of TRY and the error signal(ideally, Y arm length) while the sweep. |
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Wed Jun 13 03:03:38 2012, yuta, Update, Green Locking, my first modescan (sort of)
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Linear range df of the delay line technique is about df ~ c/(2D). So, the linear range for the fine signal(delay line length D=30m) is about 5 MHz.
Arm cavity FSR = c/(2L) = 3.7 MHz.
So, I think we need phase shifting to do mode scan for more than 2 FSRs by holding the arm length finely with fine servo. |
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Wed Jun 13 17:39:13 2012, yuta, Update, Green Locking, calibrating the beatbox
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[Jenne, Yuta]
We put 0 dBm sine wave to the RF input of the beatbox and linear-sweeped frequency of the sine wave from 0 to 200 MHz using network analyzer (Aligent |
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Thu Jun 14 01:36:34 2012, yuta, Update, Green Locking, can't scan Y arm for 1FSR
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[Jenne, Koji, Yuta]
We tried to scan of the Y arm but we couldn't scan for more than 1FSR. |
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Thu Jun 14 04:53:39 2012, yuta, Summary, Green Locking, designing ALS loop for mode scan
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[[Requirement]]
Arm cavity FWHM for IR is
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Thu Jun 14 21:37:37 2012, yuta, Update, Green Locking, succeeded in 1FSR mode scan
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[Jenne, Yuta]
We couldn't scan the Y arm for 1FSR last night because the ALS servo breaks while sweeping. |
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Fri Jun 15 00:50:54 2012, yuta, Update, Green Locking, scanned Y arm for 5FSR
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I scanned Y arm for 5FSR (below).
I could done this after I put a whitening filter.
Currently, whitening filter between the beatbox and AA filter is made of |
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Fri Jun 15 13:33:39 2012, yuta, Update, Green Locking, ADC noise contribution to ALS
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ADC noise is not a limiting noise source in a current ALS setup.
Below is the calibrated spectrum of C1:ALS-COARSE_I_ERR when |
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Sat Jun 16 01:03:21 2012, yuta, Update, Green Locking, used longer delay line for mode scan
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[Mengyao, Yuta]
Last night, I used 1.5 m delay line COARSE and got 5FSR mode scan. The range 5FSR was limited by the range of SR560. |