 Thu Dec 9 21:57:35 2021, Yehonathan, Update, BHD, SOS assembly 
|
{Yehonathan, Tega}
We took the optic out of the SOS tower and removed the side blocks. We mounted new side blocks with wires already clamped in them in the reverse
order. |
 Fri Dec 10 15:59:23 2021, Paco, Update, BHD, Finished Coil driver (even serial number) units tests
|
[Paco, Anchal]
We have completed modifications and testing of the HAM Coil driver D1100687 units with serial numbers listed below. The DCC
tree reflects these changes and tests (Run/Acq modes transfer functions). |
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Fri Dec 10 18:55:58 2021, Tega, Update, CDS, New SUS medm screen update
|
Turns out the BLRMS monitoring channels for MC1, MC2, MC3, ITMY and SRM already exist in c1pem. So I modified the new SUS screen to display the BLRMS
info for the aforementioned optics. Next step is to add the BLRMS monitor for PRM, ITMX, ETMX and ETMY. This would require extending the number of inputs
for the "SUS" block in c1pem to accomodate the additional inputs from the remaining optics. |
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Fri Dec 10 19:22:01 2021, Koji, Update, VAC, Pumping down the RGA section
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The scan result was ~x10 higher than the previously reported scan on 2020/9/15 (https://nodus.ligo.caltech.edu:8081/40m/15570),
which was sort of high from the reference taken on 2018/7/18.
This just could mean that the vacuum level at the RGA was x10 high. |
|
Mon Dec 13 15:05:47 2021, Tega, Update, PEM, git repo for temp sensor and sus medm
|
[temperature sensor]
git repo: https://git.ligo.org/40m/tempsensor.git
todo |
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Tue Dec 14 11:33:29 2021, Tega, Update, PEM, git repo for temp sensor and sus medm
|
[Temperature sensor]
Added new temp EPICs channels to database file (/cvs/cds/caltech/target/c1pem1/tempsensor/C1PEMaux.db)
Added new temp EPICs channels to slow channels ini file (/opt/rtcds/caltech/c1/chans/daq/C0EDCU.ini) |
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Tue Dec 14 14:02:33 2021, Yehonathan, Update, BHD, SOS assembly
|
{Yehonathan, Paco}
I fixed the overall height of the adapter (attachment 1). I put an OSEM next to the side magnet. I positioned a camera in front of the SOS and
connected it to my laptop for live streaming. I painted a line indicating the height of the OSEM plates and a line in between with the mean height. I discarded |
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Tue Dec 14 19:29:42 2021, Paco, Update, BHD, 1Y0 rack work for LO1
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[Paco]
Two coil drivers have been installed on 1Y0 (slots 6, 7, for LO1 SOS). All connections have been made from the DAC, AI board, DAC adapter, Coil
driver, Sat Amp box. Then no SOS load installed, all return connections have been made from Sat Amp box, ADC adapter, AA board, and to ADC. We will continue |
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Wed Dec 15 13:57:59 2021, Paco, Update, Computers, upgraded ubuntu on zita
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[Paco]
Upgraded zita's ubuntu and restarted the striptool script. |
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Wed Dec 15 15:06:08 2021, Jordan, Update, VAC, Vacuum Feedthru Install
|
Jordan, Chub
We installed the 4x DB25 feedthru flange on the North-West port of ITMX chamber this afternoon. It is ready to go. |
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Wed Dec 15 22:09:53 2021, Yehonathan, Update, BHD, SOS assembly
|
{Paco, Yehonathan, Anchal}
I cut the wires from the winches and removed the winch adapter plate. I engrave 'LO1' on the SOS tower. Me and Paco wrapped the
SOS with foil and transported it to Anchal who put it inside the ITMX chamber. |
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Thu Dec 16 12:21:16 2021, Anchal, Update, BHD, Coil driver test failed for S2100619-v1
|
Today I found one of the coil driver boards, S2100619 failed the test on CH2. There appears to be an
extra phase lag after 10 kHz and some resonant-like feature at 7 kHz. This of course is very high-frequency stuff and maybe we don't care about these
deviations. But it could mean something is off with the channel and could potentially lead to failure in the relevant frequency band in the future. I'll |
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Thu Dec 16 15:04:12 2021, Chub, Update, Electronics, ITMX feedthroughs and in-vac cables installed
|
The ITMX 10" flange with four DSUB-25 feedthroughs has been install with the cables connected at the in-vac side. See photo; as requested,
LO1-1 and LO1-2 are connected to the top row of feedthroughs from left to right respectively and the opposite ends of the cables placed left to right on
the laser table. PR2-1 and PR2-2 are connected to the lower row of feedthroughs from left to right respectively, with the opposite ends placed on |
|
Thu Dec 16 15:32:59 2021, Anchal, Update, BHD, Finished Coil driver (odd serial number) units tests
|
We have completed modifications and testing of the HAM Coil driver D1100687 units with serial numbers listed below. The DCC
tree reflects these changes and tests (Run/Acq modes transfer functions).
SERIAL #
TEST |
|
Thu Dec 16 15:54:08 2021, Koji, Update, Electronics, ITMX feedthroughs and in-vac cables installed
|
Thanks for the installation.
With regard to the connector convention, let's use the attached arrangement so that it will be consistent with the existing flange DSUB configuration.
Not a big deal. |
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Thu Dec 16 17:41:12 2021, Koji, Update, BHD, Coil driver test failed for S2100619-v1 6x
|
Good catch. It turned out that the both + and - side of the output stages for CH2 were oscillating at ~600kHz. If I use a capacitance sticks to touch
arbitrarily around the components, it stops their oscillation and they stay calm.
It means that the phase margin becomes small while the circuit starts up. |
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Thu Dec 16 17:57:17 2021, Anchal, Update, BHD, Finished Coil driver (odd serial number) units tests
|
S2100619 was fixed by Koji and it passed the test after that.
Quote:
|
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Thu Dec 16 18:16:36 2021, Yehonathan, Update, BHD, SOS assembly
|
Today I glued magnets onto the new 3/4" mirror adapters. I also took the opportunity to make some more side magnets assemblies.
Yesterday I mounted PR3/SR2 3/4" thick mirror onto one of the new adapter. There seem to be no issues for now.
I started the process of suspending AS1 (E2000226-A). The Lambda Optic mirror with the closest |
|
Fri Dec 17 12:32:35 2021, Koji, Update, SUS, Remaining task for 2021
|
Anything else? Feel free to edit this entry.
- SUS: AS1 hanging
- SUS: PR3/SR2/LO2 3/4" thick optic hanging |
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Fri Dec 17 17:50:17 2021, Yehonathan, Update, BHD, SOS assembly
|
I threaded a new wire through a different side block with a magnet and clamped it under a microscope. It was hard, but eventually, I was able to do it
by holding the wire on both sides of the side block with weights.
The dented wire was discarded and the side block that was mounted on the AS1 adapter was put aside. I mounted the side block with the new wire |
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Fri Dec 17 19:16:45 2021, Koji, Update, BHD, SOS assembly
|
We @40m do the convention of the arrow at the thinnest side & pointing the HR side, but nobody says Lambda does the same.
We can just remount the mirror without breaking the wires and adjust the pitching if you do it carefully.
Does this mean that the LO1 also likely to have the wedge pointing up? Or did you rotate the mirror to have the wedge reflection to be as horizontal |
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Fri Dec 17 19:19:42 2021, Koji, Update, SUS, Remaining task for 2021
|
I had the fear that any mistake in the electronics chain could have been the show stopper.
So I quickly checked the signal assignments for the ADC and DAC chains.
I had initial confusion (see below), but it was confirmed that the electronics chains (at least for LO1) |
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Fri Dec 17 22:16:07 2021, Yehonathan, Update, BHD, SOS assembly
|
I specifically checked the specification before mounting the mirror. It says clearly "Arrow at
the thinnest location pointing towards Side 1". I guess they just ignored it.
As for LO1, I mounted it without noticing the location of the arrow. Later, I checked and the ghost beam was horizontal so I left it as it is. |
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Sat Dec 18 00:56:14 2021, Koji, Update, BHD, SOS assembly
|
Sad... We just need to check the wedge direction everytime, unfortunately.
Pencil: can you try to gently wipe it off with solvent & a swab? (IPA / Acetone)
If it does not come off in the end, it's all right to leave. Do we want to scribe the arrow mark? You need a diamond pen. |
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Sun Dec 19 07:52:51 2021, Anchal, Update, SUS, Remaining task for 2021
|
The I/O chassis reassigns the ADC and DAC indices on every power cycle. When we moved it, it must have changed it from the order we had. We were aware
of this fact and decided to reconnect the I/O chassis to AA/AI to relect the correct order. We forgot to do that but this is not an error, it is expected
behavior and can be solved easily. |
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Mon Dec 20 13:52:01 2021, Koji, Update, BHD, SOS assembly
|
LO1: No need to remove the pencil mark for the damping test. Until we see serious contamination on the LO1 optic, we don't need
to take the optic off from the mount and clean it. If there is a chance of rehanging (because of a broken wire/etc), we do wipe the pencil mark.
Other optics: wipe the pencil mark as much as possible. |
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Mon Dec 20 14:10:56 2021, Anchal, Update, BHD, All coil drivers ready to be used, modified and tested
|
Koji found some 68nF caps from Downs and I finished modifying the last remaining coil driver box and tested it.
SERIAL #
TEST
result
S2100633
PASS
|
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Mon Dec 20 17:26:13 2021, Yehonathan, Update, BHD, SOS assembly 7x
|
{Yehonathan, Anchal}
I released the AS1 wires from the winches, removed the adapter from the SOS tower, and removed the Lambda optic from the adapter. Attachment
1 shows the pencil markings on the optic before cleaning. I cleaned the pencil marking from the side of the optic with acetone using swabs until there |
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Tue Dec 21 16:35:39 2021, Koji, Update, VAC, ITMX NW feedthru (LO1-1) connector pin bent
|
I've received a report that a pin of an ITMX NW feedthru connector was bent. (Attachment 1)
The connector is #1 (upper left) and planned to be used for LO1-1.
This is Pin25 and used for the PD K of OSEM #1. This means that Coil Driver #1 (3 OSEMs) uses this pin, but Coil Driver #2 (2 OSEMs) does not. |
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Tue Dec 21 18:04:46 2021, Yehonathan, Update, BHD, SOS assembly
|
| I locked the EQ stops while retaining the XY alignment on the QPD and installed 5 green OSEMs. AS1 is ready for transfer into the vacuum chamber. |
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Wed Dec 22 14:57:05 2021, Koji, Update, General, chiara local backup
|
chiara local backup of /cvs/cds has not been running since the move of chiara in Nov 19. The
remote backup has not been taken since 2017.
The lack of the local backup was because of the misconfiguration of /etc/fstab. |
|
Wed Dec 22 18:16:23 2021, Koji, Update, SUS, Remaining task for 2021
|
The in-vacuum installation team has reported that the side OSEMs of ITMX and LO1 are going to be interfering if place LO1 at the planned location.
I confirmed that ITMX has the side magnet on the other side (Attachment 1 ITMX photo taken on 2016/7/21). So we can do this swap.
The ITMX side OSEM is sticking out most. By doing this operation, we will recover most of the space between the ITMX and LO1. (Attachment 2) |
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Thu Dec 23 16:38:21 2021, Koji, Update, General, Is megatron down? (Re: chiara local backup)
|
The local backup seems working fine again. But I found that megatron is down and this is a real issue. This should
be fixed at the earliest chance.
It seems that the local backup has been successfully taken this morning. |
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Fri Dec 24 16:49:41 2021, Koji, Update, General, Is megatron down? (Re: chiara local backup)
|
It turned out that the UPS installed on Nov 22 failed (cf https://nodus.ligo.caltech.edu:8081/40m/16479
). As a fact, it was alive just for 2 weeks!
The APC UPS unit indicated F06. According to the manual (https://www.apc.com/shop/us/en/products/APC-Power-Saving-Back-UPS-Pro-1000VA/P-BR1000G), |
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Sun Jan 2 20:46:46 2022, Koji, Update, SUS, End SUS Electronics building
|
19:00~ Start working on the electronics bench
The following units were tested and ready to be installed. These are the last SUS electronics units and we are now ready to upgrade the
end SUS electronics too. |
|
Mon Jan 3 12:05:08 2022, Paco, Update, BHD, 1Y0 rack work for LO2 AS1 AS4
|
[Paco, Anchal]
Continue working on 1Y0. Added coil drivers for LO2, AS1, AS4. Anchal made additional labels for cables and boxes. We lined up all cables, connected
the different units and powered them without major events. |
|
Mon Jan 3 16:46:41 2022, Paco, Update, BHD, 1Y1 rack work for SR2, PR2, PR3
|
[Paco, Anchal]
Continued working on 1Y1 rack. Populated the 6 coil drivers, made all connections between sat amp, AA chassis, DAC, and ADC adapters for SR2,
PR2, and PR3 suspensions. Powered all boxes and labeled them and cables where needed. Near the end, we had to increase the current limit on the positive |
|
Tue Jan 4 18:26:59 2022, Anchal, Update, BHD, Tested 2" PR2 candidates transmission
|
I used the rejected light from the PBS after the motorized half-wave plate between PMC and IMC injection path (used for input power control to IMC) to
measure the transmission of PR2 candidates. These candidates were picked from QIL (QIL/2696).
Unfortunately, I don't think either of these mirrors can be used for PR2. |
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Tue Jan 4 18:27:23 2022, Paco, Update, BHD, SOS assembly -- PR3
|
[yehonathan, paco, anchal]
We continue suspending PR3 today. Yehonathan and Paco suspended the thick optic in its adapter. After fixing some nominal height and undoing
any residual roll angle (see Attachments 1,2 for pictures), we noticed a problem with the pitch angle, so we insert the counterweights all the way in. |
|
Wed Jan 5 17:46:04 2022, Anchal, Update, BHD, Tested 2" PR2 candidates transmission
|
I tested 2 more optics today, the old PR2 that we took out and another optic I found in QIL. Both these optics are also not good for our purpose.
Polarization
Incident Power [mW]
Transmitted Power [mW]
Transmission [ppm]
Existing |
|
Wed Jan 5 19:18:06 2022, Yehonathan, Update, BHD, SOS assembly -- AS4
|
{Paco, Yehonathan, Anchal}
Today we suspended AS4 (E2000226-B). Anchal mounted Lambda Optic mirror with an RoC closest to AS4 in a thin optic mount. He noted that this |
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Thu Jan 6 12:52:49 2022, Anchal, Update, CDS, Yearly DAQD fix 2022!
|
Just as predicted, all realtime models reported "0x4000" error. Read the parent post for more details. I fixed this by following the instructions.
I add folowing lines to the file /opt/rtcds/rtscore/release/src/include/drv/spectracomGPS.c
in fb1: |
|
Thu Jan 6 13:54:28 2022, Koji, Update, CDS, Yearly DAQD fix 2022!
|
Just restarting all the c1sus2 models fixed the issue. (Attachment 1)
SUS2 ADC1 CH21 is saturated. I'm not yet sure if this is the electronics issue or the ADC issue.
SUS2 ADC1 CH10 also has large offset. This should also be investiagted. |
|
Thu Jan 6 14:08:14 2022, Koji, Update, CDS, More BHD SUS screens added to sitemap
|
| More BHD SUS screens added to sitemap (Attachment 1) |
|
Thu Jan 6 15:10:38 2022, Koji, Update, SUS, ITMX Chamber work
|
[Anchal, Koji]
=== Summary ===
- ITMX SD OSEM migration done |
|
Thu Jan 6 17:00:20 2022, Yehonathan, Update, BHD, SOS assembly -- LO2
|
{Paco, Yehonathan}
Today we suspended LO2 (E1800089) which Anchal has loaded into the thick optic
adapter. Attachments 1,2 show the height and roll balance adjustments. |
|
Thu Jan 6 17:16:51 2022, Yehonathan, Update, BHD, Using Peek screws/nuts
|
There were several cases where the long EQ stops didn't perform as expected.
In one type of case, we used a counterweight at the front of the adapter but not in the back leaving a recess where the lower back EQ stop should
touch. |
|
Thu Jan 6 22:18:47 2022, Koji, Update, CDS, SUS screen debugging
|
Indicated by the red arrow:
Even when the side damping servo is off, the number appears at the input of the output matrix
Indicated by the green arrows: |
|
Fri Jan 7 17:54:13 2022, Anchal, Update, BHD, PR2 Sat Amp has a bad channel
|
[Anchal, Paco]
Yesterday we noticed that one of the ADC channels was overflowing. I checked the signal chain and found that CH3 on PR2
Sat Amp was railing. After a lot of debugging, our conclusion is that possible the PD current input trace is shorted to the positive supply through |
|
Fri Jan 7 17:59:45 2022, Yehonathan, Update, BHD, SOS assembly -- SR2
|
{Yehonathan, Paco}
{Paco, Yehonathan}
Today we suspended SR2 (E1800089) which Anchal has loaded into the thick optic |