 Thu Jun 22 00:47:00 2023, Koji, Update, , IFO working after ETMX electronics upgrade 
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[Mayank, Koji]
ETMX Sat amp (D080276) CH3 PD receiver circuit fixed.
At today's meeting, Yuta reported that ETMX LL OSEM had no response. |
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Thu Jun 22 01:04:42 2023, Koji, Update, , IFO recovery
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I wanted to check the oplev functionality but the IFO was not well aligned. So started the CDS recovery.
Here is the procedure
- Played a CDS restarting whack-a-mole: a host suffered from DACKILL (DK), so reboot the machine. And this made the other |
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Thu Jun 22 22:34:43 2023, Koji, Update, , IFO recovery
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[Hiroki, Mayank, Koji]
The X end PZT driver for green alignment:
The driver module was inserted to the Eurocard crate. Turned on the 100V HV supply. There was nothing dramatic seemed to happen.
There |
 Thu Jun 22 23:09:32 2023, Koji, Update, ALS, X end green beam alignment
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[Hiroki, Mayank, Ruben, Koji]
As we expected that the X-end PZT steerers takes more times to be recovered, we decided to align the X-end beam with the PZTs not energized.
Because of some green alignment effort by the cavity mirrors earlier today (no elog seen yet), the Xarm IR alignment was found to be completely |
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Mon Jun 26 10:21:44 2023, Koji, Update, CDS, Deleted harmful script link on the IFO ALIGN screen
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There were a few scripts linked on the IFO ALIGN screen. These silently ran ASS and leave (possible) offsets in ASS. When the script was run secondtime,
the manual alignment was destroyed.
I deleted them from the screen as they were harmful. |
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Mon Jun 26 13:11:18 2023, Koji, Update, VAC, N2 Vent
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[Yehonathan, Mayank, Hiroki, JC, Koji]
Vent prep from 10AM
IMC/arms are flashing / PRM / SRM aligned / BHD LO visible on the BHD camera
Oplevs aligned (Attachment 1)
OSEM |
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Mon Jun 26 18:37:35 2023, Koji, Update, safety, 40m Lab Laser Safe
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40m Lab is now Laser Safe
- The PSL NPRO (Innolight) was turned off with the OFF switch and the key. The LD set current was 2.100A. The crytsal temp setpoint was 30.61degC.
The PSL AUX NPRO (LWE) was already off. |
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Tue Jun 27 19:19:17 2023, Koji, Summary, General, 5ft x 12 ft x 2ft optical table removal 8x
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[Many]
The large optical table (5ft x 12ft x 2ft, previously called SP table) was moved from the 40m lab. (Attachment 1)
The contractor did a professional job and successfully transported the optical plate to the Synchrotron building without damaging the 40m facility. |
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Tue Jun 27 19:49:37 2023, Koji, Update, VAC, Pumping down attemp
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[Mayank, Hiroki, Yuta, JC, Koji]
After JC came back from the optical table placement at Synchrotron, we tried to pump down the 40m vacuum.
However, we were unable to change the gate valves. |
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Wed Jun 28 11:54:23 2023, Koji, Update, General, 40m LASER HAZARD
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40m has been transitioned to LASER HAZARD now.
PSL/ETMX/ETMY NPROs were turned on.
Radhika can turn on the PSL AUX laser. |
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Thu Jun 29 01:52:26 2023, Koji, Summary, General, IFO back in operation
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[Mayank, Hiroki, Koji]
Once we reached 1~2mtorr, we opened the PSL shutter.
The IMC was immediately locked and aligned with the WFS. |
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Thu Jun 29 20:10:17 2023, Koji, Update, VAC, Pumping down
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Towards Vacuum Normal
Closed V7 (Main volume pumped by TP1/TP2)
Opened VA6 (Annuli pumped by TP3)
I kept having trouble controlling
TP2 from EPICS. So, temporarily the controller was set to "FRONT" (PANEL) mode rather than "SERIAL" mode. This problem should be fixed. |
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Fri Jul 7 15:24:38 2023, Koji, Configuration, Daily Progress, Alignment and restoring the IFO
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The incompleteness of burtrestore is a critical issue. We need to track down what is the issue.
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Fri Jul 7 20:09:53 2023, Koji, Summary, ASC, IFO alignment is in a strange state
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Before any trial at the ETMX suspension, ETMX coil driver "Run" mode (a sort of dewhitened mode) is ON at the coil driver. The "Binary
Input" short plugs should be modified to turn them to "Run" mode. |
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Tue Jul 11 17:21:58 2023, Koji, Update, VAC, Pumping down
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Manually switched TP2 to "Low Speed (LS)" mode (aka "Stand by")
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Thu Jul 13 17:05:10 2023, Koji, Update, General, Green laser at Y-End
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The LED blinking on the head is normal. We can ignore that.
It is likely that the controller is the issue. I brought the PSL AUX laser controller to the Y End, and the laser turned on / the green
light was visible. |
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Thu Jul 13 19:34:08 2023, Koji, Update, General, Green laser at Y-End
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Borrowed an NPRO controller from Liyuan @ Downs B138
Model M125/6-OPN-PA
SN 359M |
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Tue Jul 18 14:47:03 2023, Koji, Update, Daily Progress, T&R measurement setup for PR2
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What's the nominal AOI for the mirror and the T value at that angle in a number? We will need that later.
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Thu Jul 20 17:28:03 2023, Koji, Update, BHD, BHD Platform OMC cables
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Dean made the OMC cables for the BHD Platform. They are going through the C&B process.
From left to right: QPD cable, PZT cable with Picomotor etc, DCPD cables |
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Mon Jul 24 17:25:41 2023, Koji, Update, PEM, ADC/DAC setup of the temp sensor / heater for the X End Seismometer enclosure
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[Koji, Advait]
Summary
Spare ADC/DAC channels were prepared for Advait's experiment. |
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Mon Jul 24 23:01:10 2023, Koji, Summary, CDS, FIXED: rossa can't boot
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Compared the network settings between some of the machines.
It seemed that we can write network settings into /etc/network/interfaces. (Comment lines omitted)
source /etc/network/interfaces.d/* |
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Tue Jul 25 10:22:09 2023, Koji, Update, PEM, Remarks on the IFO recovery after CDS restart.
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Yesterday during the recovery work from the CDS restart, I found ASS was not working for both arms. Both arms were flashing and locking, but their alignment
seemed suboptimal.
Also, something seemed wrong: For example, the ITMX was too excited when the OPLEV servos were on. The arm locking was achieved when the ITMX |
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Thu Jul 27 10:43:58 2023, Koji, Update, ALS, OLTFS of digital controller
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Wow, this is awesome. Can you plot the comparison between the measured and expected OLTFs for both (or either) Moku cases?
At low freq, the measurement of OLTFs gets difficult due to high loop suppression and the estimation will give us an idea of how the loop can be
improved. |
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Thu Jul 27 17:03:57 2023, Koji, Summary, CDS, c1psl spare channel situation
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I looked at the Acromag situation of c1psl to prepare for the PSL air flow speed sensor.
Someone clever did a great job of binding all the spare channels into DB37s.
The pin-outs and channel assignments are all listed in a Google spreadsheet. The link can be found on the following wiki page. |
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Thu Jul 27 18:21:33 2023, Koji, Update, ALS, OLTFS of digital controller
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Here is the OLTF from the model of the system I made in Python. https://github.com/CaltechExperimentalGravity/LaserStabilization/blob/main/code/PlantSim/plant_model.py
With this model, I should be able to plug in potential optimal controllers and see how the OLTF might improve. The green line shows the OLTF |
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Fri Jul 28 00:27:17 2023, Koji, Update, PEM, ITMX issue continues
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Even though the noise issue of an OSEM was resolved, the issue with ITMX still continues.
OPLEV pitch servo can't be turned on as it induces the suspension running. So there is something systematically wrong with the suspension.
This requires some checking of the whitening / dewhitening situation, or even other unknown cause. |
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Sat Jul 29 00:44:57 2023, Koji, Update, PEM, Remarks on the IFO recovery after CDS restart.
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I had a suspicion that some of the ITMX coils were not properly working. So individual coils of the 4 test masses were excited while the arm-locking
servo output was observed.
The servo output of the arm locking (denoted as |
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Mon Jul 31 22:25:07 2023, Koji, Update, PEM, FIXED: Strange behavior of ITMX and ITMY probably due to DAC issue
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[Hiroki, Yehonathan, Yuta, Koji]
Summary
The c1sus DAC0 issue seemed to be the driving capability of the DAC card.
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Wed Aug 2 14:50:22 2023, Koji, Update, PSL, FIXED: Remote switching of PSL shutter is not working
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[JC Koji]
c1vac was hard rebooted. This fixed the PSL shutter issue.
Checked the Unibritz Shutter Controller for the PSL shutter. It seems that it responds to the NO/NC switch no matter how the |
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Wed Aug 2 17:17:37 2023, Koji, Update, PSL, IMC Locking (FIXED: Remote switching of PSL shutter is not working)
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After the exploration of c1psl, the IMC locking was not functioning well. It looked like the MC autolocker issue.
Now I remember that the autolocker was running on docker. I followed the instruction on the wiki page. https://wiki-40m.ligo.caltech.edu/Computers_andScripts/AlwaysRunningScripts
Remember: Docker is running on optimus / systemctl is running on megatron! |
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Thu Aug 3 17:27:07 2023, Koji, Update, CDS, Slow machine target folder clean up
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I went to /cvs/cds/caltech/target and found some folders for apparently old targets.
c0daqawg
c0daqctrl |
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Thu Aug 3 21:35:50 2023, Koji, Configuration, PEM, PSL Flow speed sensor channels added
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As the preparation of the flow sensor installation, I added two slow channels via c1psl (Acromag IOC).
C1:PEM-HEPA_FLOW_PSL1
C1:PEM-HEPA_FLOW_PSL2 |
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Fri Aug 4 20:50:13 2023, Koji, Summary, CDS, The location where the wiper script is running
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The raw frame file is stored in /frames at fb. Before the disk space is flooded, the wiper script deletes the old raw frame files.
I wonder what the state of the wiper script is.
There are wiper scripts (wiper.pl) in /opt/rtcds/caltech/c1/target/fb and /opt/rtcds/caltech/c1/target/daqd, but they no longer seemed to be |
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Sat Aug 5 01:42:19 2023, Koji, Update, PEM, c1sus DAC1/DAC2 negative side DAC outputs were isolated from the downstream chain 9x
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As reported already, we resolved the c1sus DAC0 issue by introducing the differential receivers for the DAC output CHs.
The issue remained in DAC1 (SRM/MC2/MC1/MC3) and DAC2 (All 8 vertex side OSEMs). Their outputs were still received by the single-ended AI boards.
This meant that DAC1 and DAC2 negative side outputs were shorted to ground. This was not great. |
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Sat Aug 5 01:46:01 2023, Koji, Update, Optical Levers, BS/PRM/SRM Oplev dead
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[Koij Hiroki]
While KA was working on the DAC issue, BS/PRM/SRM Oplev died.
It seems that the BS/PRM/SRM HeNe died and was replaced in 2019 (4yrs + 200 days ago) and 2021 Jan (2yrs + 209 days ago). |
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Fri Aug 11 20:44:00 2023, Koji, Update, PSL, CDS crash / PMC recovery and mystery / IFO recovery
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[JC, Koji]
In the morning, JC came in and found that c1sus had crashed. JC tried to save the situation by rebooting the host, inevitably, all the CDS machines
needed to be rebooted. |
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Mon Aug 14 15:16:40 2023, Koji, Update, IOO, PMC offset voltage issue fixed. IMC WFS recentered and offsets zeroed.
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1. Well, it seems that the PMC error offset issue still remains.
2. The IMC transmon QPD had been aligned for some reference e.g. Max transmission, Center of the MC2 mirror,
lowest noise, or else. It's not arbitrary. |
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Tue Aug 15 00:41:17 2023, Koji, Update, IOO, PMC issue cont'd
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I went down to the IFO hall and checked the PMC situation. The freq mixer fixed on the rack 1X1 had BNC-T, so the raw error was checked while the PMC
was swept around the resonance.
The error signal was ~1mVpp while there is ~1mV offset. |
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Tue Aug 15 00:44:29 2023, Koji, Update, General, ELOG slowness fixed
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Elog was continuously accessed by net crawlers or something similar. They continuously retrieve random logs and also randomly hits the entries with invalid
attachments. The invalid attachments call "convert" to make thumbnails, but fail. Because the crawlers fail to obtain the thumbnails, they try
the same URL again, and again. |
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Tue Aug 15 17:11:17 2023, Koji, Update, IOO, FIXED: PMC issue 7x
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Summary
The problem in the PMC Frequency Reference Card (35.5MHz) was fixed.
The last opamp stage of the attenuator control (LT1125) had the negative rail, and the EOM drive level was maximally attenuated. |
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Wed Aug 16 17:16:13 2023, Koji, Update, General, BHD / Misc Inventory 11x
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== BHD Components ==
BHD BS:
We still have a spare BHD BS @South end optics cabinet. (Attachment 1) |
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Tue Aug 22 15:56:53 2023, Koji, Update, General, BHD / Misc Inventory
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| Photodiode inventory: [OMC ELOG 615] |
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Wed Aug 23 19:47:53 2023, Koji, Update, CDS, Dolphin Fencing Investigation / Full CDS crash / nodus reboot / recovered all
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Dolphin Investigation
- I made a basic description on a wiki page: https://wiki-40m.ligo.caltech.edu/CDS/DolphinSwitch
- Investigation crashed c1lsc/c1sus/c1iscex/c1sus2. Well, it's time to test the dolphin fencing. It |
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Thu Aug 24 02:54:19 2023, Koji, Update, BHD, OMC Interface Aligner / BHD OFI arrangement
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OMC Interface Aligner - (It's upside down...)
BHD OFI arrangement |
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Thu Aug 24 17:08:38 2023, Koji, Update, General, Excess noise on YALS BEAT
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Paco took the data which means he already had the beat note.
There is some chance that the beat was recovered after some mode "jumps" but usually the temp gap for the same beat frequency is ~2degC.
So my speculation is that there is a big temp gradient in the crystal now and had to compensate it with the struggle of the crystal TEC. |
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Fri Aug 25 20:27:33 2023, Koji, Update, BHD, OMC Interface Aligner
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A bit improved the design of OMC Interface Aligner
The idea is...The OMC I/F aligner covers the OMC for aligning the kinematic mounts (3 pairs of a V-groove and a ball) on the OMC. This makes
the kinematic mount of two OMCs identical. |
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Fri Aug 25 22:52:30 2023, Koji, Update, General, Taking nodus /home/export backup
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Took the backup (snapshot) of nodus' /home/export as of Aug 25, 2023
controls@nodus> cd /cvs/cds/caltech/nodus_backup
controls@nodus> rsync -ah --progress --delete /home/export ./export_230825 >rsync.log& |
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Tue Aug 29 01:39:47 2023, Koji, Update, General, BHD / Misc Inventory
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40m BHD OFI Inventory
OFI HWP 1
Motorized Rotary Stage Thorlabs PDR1V Qty 1
0.5inch HWP: QWPO-1064-05-2 |
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Tue Aug 29 02:02:51 2023, Koji, Update, BHD, BHD Prep Status
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Ready / Soon Ready
- BHD OMC Cables ready
- OMC#1 / OMC#4 ready |
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Tue Sep 5 18:46:08 2023, Koji, Summary, General, Dsub 9 (DB9) cable inventory
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I went to Section Y7 to check the stock DB9-MF cables. The custom dsub cables are also there.
DB9 1FT / QTY 26
DB9 2.5FT / QTY 42
DB9 5FT / QTY 49
DB9 10FT / QTY 30
DB9 15FT / QTY 9
Let's
say this is (26, 42, 49, 30, 9) |