 Mon Aug 15 10:27:56 2022, Koji, Update, General, Recap of the additional measures for the outage prep 
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[Yuta Koji]
(Report on Aug 12, 2022)
We went around the lab for the final check. Here are the additional notes. |
 Mon Aug 15 15:43:49 2022, Anchal, Update, General, Complete power shutdown and startup documentation
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All steps taken have been recorded here:
https://wiki-40m.ligo.caltech.edu/Complete_power_shutdown_2022_08 |
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Mon Aug 15 18:06:07 2022, Anchal, Update, General, c1vac issues, 1 pressure gauge died
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[Anchal, Paco, Tega]
Disk full issue:
c1vac was showing /var disk to be full. We moved all gunzipped backup logs to /home/controls/logBackUp.
This emptied 36% of space on /var. Ideally, we need not log so much. Some solution needs to be found for reducing these log sizes or monitoring them for |
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Mon Aug 15 20:09:18 2022, Koji, Update, General, c1vac issues, 1 pressure gauge died
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- Disk Full: Just use the usual /etc/logrotate thing
- Vacuum gauge
I rather feel not replacing P1a. We used to have Ps and CCs as they didn't cover the entire pressure range. However, this new FRG (=Full |
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Wed Aug 17 10:23:05 2022, Tega, Update, General, c1vac issues, pressure gauge replacement
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- Disk full
I updated the configuration file '/etc/logrotate.d/rsyslog' to set a file sise limit of 50M on 'syslog' and 'daemon.log'
since these are the two log files that capture caget & caput terminal outputs. I also reduce the number of backup files to 2. |
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Wed Aug 17 10:27:49 2022, Cici, Update, General, Locking X-arm AUX laser
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TL;DR: Got the x-arm aux laser locked again and took more data - my fit on my transfer functions need improvement and my new method for finding coherence
doesn't work so I went back to the first way! See attached file for an example of data runs with poor fits. First one has the questionable coherence
data, second one has more logical coherence. (ignore the dashed lines.) |
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Thu Aug 4 19:01:59 2022, Tega, Update, Computers, Front-end machine in supermicro boxes
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Koji and JC looked around the lab today and found some supermicro boxes which I was told to look into to see if they have any useful computers.
Boxes next to Y-arm cabinets (3 boxes: one empty) |
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Mon Aug 8 17:16:51 2022, Tega, Update, Computers, Front-end machine setup
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Added 3 FE machines - c1ioo, c1lsc, c1sus - to the teststand following the instructions in elog15947.
Note that we also updated /etc/hosts on chiara by adding the names and ip of the new FE since we wish to ssh from there given that chiara is where we land
when we connect to c1teststand. |
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Wed Aug 10 20:51:14 2022, Tega, Update, Computers, CDS upgrade Front-end machine setup
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Here is a summary of what needs doing following the chat with Jamie today.
Jamie brought over the KVM switch shown in the attachment and I tested all 16 ports and 7 cables and can confirm that they all work as expected. |
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Tue Aug 16 18:22:59 2022, Tega, Update, Computers, c1teststand rack mounting for CDS upgrade
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[Tega, Yuta]
I keep getting confused about the purpose of the teststand. The view I am adopting going forward is its use as a platform for testing the compatibility
of new hardware upgrade, instead of thinking of it as an independent system that works with old hardware. |
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Wed Aug 17 11:10:51 2022, rana, Update, Computers, c1teststand rack mounting for CDS upgrade
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we want to be able to run SimPlant on the teststand, test our new controls algorithms, test watchdogs, and any other software upgrades. Ideally in the
steady state it will run some plants with suspensions and cavities and we will develop our measurement scripts on there also (e.g. IFOtest).
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Thu Aug 18 16:35:29 2022, Cici, Update, General, UGF linked to optical gain!
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TL;DR: When the laser has good lock, the OLTF moves up and the UGF moves over!
-----------------------------------------------------------
Figured out with Paco yesterday that when the laser is locked but kind of weakly (mirrors on the optical table sliiightly out of alignment, for |
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Fri Jul 1 08:50:48 2022, yuta, Summary, LSC, FPMI with REFL/AS55 trial
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[Anchal, Paco, Yuta]
We tried to lock FPMI with REFL55 and AS55 this week, but no success yet.
FPMI locks with POX11, POY11 and ASDC for MICH stably, but handing over to 55's couldn't be done yet. |
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Thu Jul 14 00:10:08 2022, yuta, Summary, LSC, FPMI with REFL/AS55 trial continued
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[Paco, Koji, Yuta]
We managed to lock MICH using REFL55_Q by setting the demodulation phases and offsets right.
The following is the current FPMI locking configuration we achieved so far. |
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Fri Jul 15 19:13:22 2022, Paco, Summary, LSC, FPMI with REFL/AS55 demod phase adjust
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[Yuta, Paco]
We first zero the offsets in ASDC, AS55, REFL55, POX11, and POY11 when PSL shutter is closed.
After this, we checked the
offsets with only ITMX aligned. Some of RFPDs had ~2 counts of offsets, which indicate some RFAM of sidebands, but we decided not to tune Marconi frequencies |
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Fri Jul 15 22:36:04 2022, rana, Summary, LSC, FPMI with REFL/AS55 demod phase adjust
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Very nice!
DARM feedback should go to ETMY - ETMX, not just a single mirror: Differential ARM.
For it to work with 1 mirror the UGF of the CARM loop must be much larger than DARM UGF. But in our case, both have a UGF of ~150 Hz. |
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Mon Jul 18 16:39:07 2022, Paco, Summary, LSC, FPMI locking procedure using REFL55 and AS55
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[Yuta, Paco]
In summary, we locked FPMI using REFL55_I, REFL55_Q, and AS55_Q. The key to success was to mix POX11_I and POY11_I in the right way
to emulate CARM/DARM, and to find out the correct demodulation phase for AS55. |
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Mon Jul 18 21:41:42 2022, Anchal, Summary, LSC, FPMI locking procedure using REFL55 and AS55
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Now that you have found a working configuration, I suggest we update CARM and DARM filter banks so that they are used in locking those degrees of freedom
instead of repurposing XARM/YARM banks. It would be bit easier to understand and leaves room for future changes for one configuration while keeping single
arm lock configurations untouched. |
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Tue Aug 9 19:54:31 2022, yuta, Summary, LSC, FPMI locking tonight
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[Tega, Anchal, Yuta]
We resored FPMI locking settings. Below is the summary of locking configurations tonight. |
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Thu Aug 18 14:49:35 2022, Yehonathan, Summary, LSC, FPMI Sensitivity
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{Yuta, Yehonathan}
We wrote a notebook found on Git/40m/measurements/LSC/FPMI/NoiseBudget/FPMISensitivity.ipynb for calculating the MICH, DARM (currently XARM),
CARM (currently YARM) sensitivities in the FPMI lock which can be run daily. |
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Thu Aug 18 18:10:49 2022, Koji, Summary, LSC, FPMI Sensitivity
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The overlapping plot of the calibrated error and control signals gives you an approximately good estimation of the freerun fluctuation,
particularly when the open-loop gain G is much larger or much smaller than the unity.
However, when the G is close to the unity, they are both affected by "servo bump" and both signals do not represent the |