 Mon Jul 22 16:30:31 2013, Koji, Update, General, Vent preparation
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[Annalisa, Manasa, Jenne, Koji]
We are working on the vent preparation.
First of all, there was no light in the interferometer. |
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Mon Jul 22 22:06:18 2013, Koji, Update, CDS, FE Web view was fixed
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FE Web view was broken for a long time. It was fixed now.
The problem was that path names were not fixed when we moved the models from the old local place to the SVN structure.
The auto updating script (/cvs/cds/rtcds/caltech/c1/scripts/AutoUpdate/update_webview.cron) |
 Tue Jul 23 00:51:46 2013, Koji, Update, endtable upgrade, End table picture 
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The spot on the IPANG QPD was checked. The spot is higher than the center and South side of the lens.
Some photos are found below.
The spot on the IPANG steering mirrors in the ETMY chamber was also checked. |
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Tue Jul 23 03:10:57 2013, Koji, Update, General, Vent preparation - In progress
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Centering of the oplev beams: done
Recording the OSEM values: done |
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Tue Jul 23 04:22:03 2013, Koji, Update, General, Vent preparation - In progress
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[Koji Jenne]
Low power MC locking
- Rotated HWP right after the laser |
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Tue Jul 23 13:29:58 2013, Koji, Summary, General,
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| record of the initial state |
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Tue Jul 23 13:55:08 2013, Koji, Update, IOO, MC manually aligned
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| The MC was manually aligned. The spot positions were measured and it is consistent with the measurements done yesterday. |
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Tue Jul 23 16:39:31 2013, Koji, Update, General, Full IFO alignment recovered
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[Annnalisa Koji]
Full alignment of the IFO was recovered. The arms were locked with the green beams first, and then locked with the IR.
In order to use the ASS with lower power, C1:LSC-OUTPUT_MTRX_9_6 and C1:LSC-OUTPUT_MTRX_10_7 were reduced to 0.05. |
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Tue Jul 23 21:32:43 2013, Koji, Update, IOO, Found the cause of mysterious MC motion
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Thesedays we were continuously annoyed by unELOGGED activities of the interferometer.
MC2 LOCKIN was left on and has continuously injected frequency noise and beam pointing modulation
during all of the comissioning / vent preparation. |
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Wed Jul 24 15:07:54 2013, Koji, Update, SUS, SR2 flipped
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| After the first flipping, X/Y arms were aligned and locked. Then the ASS aligned the arms. |
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Thu Jul 25 02:53:00 2013, Koji, Update, General, IFO Alignment after TT flipping - no progress
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There was no progress tonight after Jenne left.
I could not find any reasonable fringes of the IFO after 3 hours of optics jiggling.
* I jiggled TT1 and TT2. The slider has not been restored. |
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Fri Jul 26 13:39:30 2013, Koji, Update, ASC, POP QPD analysis
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It was not actually easy to see from the entry what signal was taken in what condition but from the shape of the spectra
I had the impression that the ASC & OPLEV signals were measured under the presence of the ASC control.
That is (moderately to say) tricky as the ASC control imprints the angular noise |
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Mon Jul 29 16:15:13 2013, Koji, Update, VAC, AC removed
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Prior to the access connector removal, Manasa and I aligned the IFO mirrors.
The arms were locked and aligned by ASS. |
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Tue Jul 30 00:21:15 2013, Koji, Update, General, Vent progress
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[Koji, Manasa, Sujan]
Tomorrow we'll make final checks of the optics inside the chamber.
Then we will pump down the chamber. |
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Tue Jul 30 13:41:35 2013, Koji, Update, General, ITMX oplev
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I wonder what optics is causing the halo on the oplev beam.
It this comes from any uncoated lens (or similar) it should be identified. |
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Mon Aug 5 19:10:01 2013, Koji, Update, CDS, Choosing LO Amplitudes and Frequencies
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- I suppose the green transmission paths were thoroughly inspected and aligned in prior to the measurement
- Of course it is a BAD idea to use 60Hz as the LO frequency.
- Power spectra should be plotted as "RIN (relative intensity noise)" as the DC of 1 and 100 gives you 100 times different power spectra |
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Wed Aug 7 10:09:30 2013, Koji, Update, LSC, Arms locked in IR, aligned. IFO at nominal power
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I have a concern about the SRM suspension. The yaw alignment bias produces huge pitch coupling.
This could be a connector issue or the rubbing of the mirror on the EQ stops.
We have the photos of the magnets and they were not touching the OSEMs. |
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Wed Aug 7 15:32:37 2013, Koji, Update, ASC, ASS setting up accelerated (slightly)
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I moved bunch of ezcawrite from the ASS Dither On script to a snapshot file.
This accelerated a half of the "up" time but still switching part is not in the snapshot.
If you find anything wrong with ASS, please notify me. |
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Wed Aug 7 22:18:43 2013, Koji, Update, ASC, ASS update
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While Gautam is working on the Xarm green ASS...
The EPICS monitor points for the ASS actuators were added to the ASS model.
This will be used for the offloading the ASS actuations to the alignment biases. |
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Thu Aug 8 21:25:36 2013, Koji, Update, General, Post-vent alignment cont'd
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- IPANG aligned on the QPD. The beam seems to be partially clipped in the chamber.
- Oplev of the IFO mirrors are aligned.
- After the oplev alignment, ITMX Yaw oplev servo started to oscillate. Reduced the gain from -50 to -20. |
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Fri Aug 9 21:05:28 2013, Koji, Update, SUS, fixed: SRM coils fine - problem with slow bias slider
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Now the SRM Yaw bias in yaw is functional without any strage behavior.
The problem was found at the connector of the flat ribbon cable from the DAC to the cross connect.
I used the extender board to diagnose the SRM coil driver circuit at 1X4. |
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Fri Aug 9 22:51:37 2013, Koji, Update, LSC, PRMI(sb) lock recovered
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PRMI(sb) lock was recovered
PRMI lock
- Stared at the time series data of the REFL demod signals, and decided to use REFL165I&Q for the locking. |
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Mon Aug 12 17:30:03 2013, Koji, Update, ASC, PRCL ASS software in place
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| Why POPDC??? |
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Tue Aug 13 17:20:54 2013, Koji, Update, CDS, [Fixed] c1iscex needs help
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c1x01 timing issue was solved. Now all of the models on c1iscex are nicely running.
Symptons
- c1x01 was synchronized to 1PPS in stead of |
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Tue Aug 13 21:49:32 2013, Koji, Summary, General, Testing new AG4395A network analyzer
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New AG4395, sn MY41101114 for West Bridge Labs was delivered. For the test purpose it is at the 40m now.
I made a series of tests in order to find anything broken.
Network analyzer test |
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Tue Aug 13 22:21:12 2013, Koji, Summary, General, Minicircuit Filter TFs (AG4395A test)
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As a part of the network analyzer test in the previous entry, the transfer functions of Mini-Circuits filters we have at the 40m were measured.
<<List of the filters>>
- LPF (SMA): SLP1.9, SLP5, SLP21.4, SLP30, SLP50, SLP100, SLP150, SLP750 |
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Thu Aug 15 01:51:50 2013, Koji, Summary, General, RFM<->Dolphin bridge distributed to c1rfm and c1mcs
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Since the RFM-Dolphin bridges for the ASX model was added to the c1rfm model, c1rfm kept timing-out from the single sample time of 60us.
The model had 19 dolphin accesses, 21 RFM accesses, and 9 shared memory (SHM) accesses.
At the beginning 2 RFM and 2 SHM accesses were moved to c1sus (i.e. they were mistakenly placed on c1rfm). |
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Fri Aug 16 13:25:50 2013, Koji, Update, ASS, ASX model/screen cleaning up
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[Koji Manasa]
Yesterday we cleaned up the ASX model and screens to have more straight forward structure of the screen
and the channel names, and to correct mistakes in the model/screens. |
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Mon Aug 19 09:36:32 2013, Koji, Update, Green Locking, Xend green aligned
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[Rana Koji]
This is an elog about the activity on Friday night.
- The X arm green beam was aligned with assist of the ASX system. |
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Mon Aug 19 15:23:07 2013, Koji, Update, IOO, MC mirrors' ASC has non-zero inputs
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[Jenne, Koji]
This disturbance in the MC ASC channels were fixed.
This craziness happened ~10pm last night. Was there any action at the time? >> Sunday-night workers? |
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Mon Aug 19 19:08:35 2013, Koji, Update, Green Locking, Xend green layout corrections
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- An Aluminum mirror instead of 2" unknown mirror for the pick-off for the rejected beam from the green faraday isolator (Steve)
=> Replaced. To be reviewed
- Faraday mount replacement. Check what we have for the replacement. (Steve) |
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Tue Aug 20 11:41:30 2013, Koji, Update, LSC, REFL investigations
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As I always tell everyone: Don't use a 10% reflector which produce ghost beams. Use a 90% reflector.
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Wed Aug 21 23:50:40 2013, Koji, Update, SUS, PRM SUS_LSC violin (FM5) set to correct frequency
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[Jenne Koji]
It seems that the PRM violin mode freqs shifted from 625-ish to 640Hz.
The peaks rang up because of the servo. |
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Thu Aug 22 13:20:54 2013, Koji, Update, LSC, DRMI Locked for 1+ minute!!!!!!
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Don't go for a hacky solution. We want to climb a staircase step by step.
Prepare an independent 110MHz demod ports.
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Sat Aug 24 00:11:07 2013, Koji, Update, LSC, DRMI Locked with improved lock streatches
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Friday night locking
Much more stable DRMI lock was achieved, partly thanks to the Friday-night quiet seismic,
and partly because of the improved servo gain and LF boosts |
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Mon Aug 26 19:13:38 2013, Koji, Update, LSC, LSCoffset script updated
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What do you mean???
What is the effect of the anti-whitening filter?
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Tue Aug 27 18:58:52 2013, Koji, Configuration, Electronics, 110 MHz LO options
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- Do we have an appropriate amplifier?
- True challenge could be to find a feedthrough for the new port. (or to find a space for the amplifier in the box)
- PDXXX channels is on the DC whitening filter module. There could be some modification on this module (like diabling the whitening gain selector). |
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Tue Aug 27 20:43:34 2013, Koji, Configuration, CDS, front end IPC configuration
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The reason we had the PCIe/RFM system was to test this mixed configuration in prior to the actual implementation at the sites.
Has this configuration been intesively tested at the site with practical configuration?
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Fri Sep 6 23:01:08 2013, Koji, Update, LSC, Stable DRMI lock was recovered from the impact on the RF system modification
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Summary
Stable DRMI lock was recovered. The AS110 phase was adjusted. PRCL and MICH were locked with REFL33I and |
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Wed Sep 11 23:43:10 2013, Koji, Summary, Green Locking, ALS locking in both arms
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What was the beat freq for each arm?
The HF noise level depends on the frequency of the beat note.
As the BBPD has the freq dependent noise level. (See this entry) |
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Thu Oct 3 01:18:57 2013, Koji, HowTo, LSC, steps to full IFO
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| I vote on PRMI+1arm -> PRFPMI |
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Thu Oct 17 18:29:28 2013, Koji, Update, LSC, PRMI+2arm attempt (not really yet)
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While Manasa, Jenne, and Masayuki are working on the preparing the interferometer, I write the elog for them.
- 6PM-ish: X and Y arms were was locked. They were aligned with ASS.
- PRMI was locked. The PRM was aligned with ASS. |
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Mon Oct 21 13:15:52 2013, Koji, Update, IOO, PMC aligned
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| PMC aligned. Trans 0.78 -> 0.83 |
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Thu Oct 24 15:19:58 2013, Koji, Update, LSC, PRMI + 2 ALS arms
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> all of complications of handing off
That involves:
- ALS error signals transfered to the LSC input matrix. |
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Thu Oct 24 21:46:18 2013, Koji, Update, Green Locking, ALS OFFSETTER calibration
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Quote:
I calibrated the ALS-OFFSETTER output. |
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Fri Nov 1 17:44:06 2013, Koji, Summary, LSC, Simulation of REFL_3f signal when the arms come in
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Yes, the resonance of the 2nd-order sidebands to the IFO screws up the 3f scheme.
2f (~22MHz) and 10f (~110MHz) are at x 5.6 and x 27.9 FSR from the carrier, so that's not the case.
Could we also see how much gain fluctuation of the 3f signals we would experience when the arm comes |
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Mon Nov 4 18:24:15 2013, Koji, Update, LSC, Thoughts on Transition to IR
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You have the data. Why don't you just calculate 1/SQRT(TRX)?
...yeah, you can calculate it but of course you don't have no any reference for the true displacement... |
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Sat Nov 9 10:25:43 2013, Koji, Update, LSC, New Broadband PD for POP 22/110
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General Remarks on the BBPD
- To form the LC network: Use fixed SMD inductors from Coilcraft. SMD tunable capacitors are found in the shelf right next to Steve's desk. |
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Fri Nov 15 09:27:58 2013, Koji, Update, IOO, WFS with beam dumps
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Unfortunately this does not work. These WFSs are not the detectors which we can move freely.
In order to move the WFS detectors, we need the precise design of the Gouy phase for each WFS heads.
Without the design, we can't move the detectors. |
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Fri Nov 15 12:00:28 2013, Koji, Update, CDS, Can't talk to AUXEY?
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Quote:
Please just try rebooting the vxworks machine. I think there is a key on the card or create that will reset the device. These |