 Wed Oct 6 15:04:36 2021, Hang, Update, SUS, PRM L2P TF measurement & Fisher matrix analysis 
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[Paco, Hang]
Yesterday afternoon Paco and I measured the PRM L2P transfer function. We drove C1:SUS-PRM_LSC_EXC with a white noise in the 0-10
Hz band (effectively a white, longitudinal force applied to the suspension) and read out the pitch response in C1:SUS-PRM_OL_PIT_OUT. The local |
 Wed Oct 6 16:31:02 2021, Tega, Update, Electronics, Sat Amp modifications
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[Tega, Koji]
(S2100737) - Debugging showed that the opamp, AD822ARZ, for PD2 circuit was not working as expected so we replaced with a spare and
this fixed the problem. Somehow, the PD1 circuit no longer presents any issues, so everything is now fine with the unit. |
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Thu Oct 7 02:04:19 2021, Koji, Update, Electronics, Satellite amp adapter chassis
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The 4 units of Satellite Amp Adapter were done:
- The ears were fixed with the screws
- The handles were attached (The stock of the handles is low) |
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Fri Oct 8 17:33:13 2021, Hang, Update, SUS, More PRM L2P measurements
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[Raj, Hang]
We did some more measurements on the PRM L2P TF.
We tried to compare the parameter estimation uncertainties of white vs. optimal excitation. We drove C1:SUS-PRM_LSC_EXC with "Normal" |
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Mon Oct 11 11:13:04 2021, rana, Update, SUS, More PRM L2P measurements
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| For the oplev, there are DQ channels you can use so that its possible to look back in the past for long measurements. They have names like PERROR |
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Mon Oct 11 13:59:47 2021, Hang, Update, SUS, More PRM L2P measurements
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We report here the analysis results for the measurements done in elog:16388.
Figs. 1 & 2 are respectively measurements of the white noise excitation and the optimized excitation. The shaded region corresponds to the
1-sigma uncertainty at each frequency bin. By eyes, one can already see that the constraints on the phase in the 0.6-1 Hz band are much tighter in the |
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Wed Oct 13 15:36:38 2021, Hang, Update, Calibration, XARM OLTF
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We did a few quick XARM oltf measurements. We excited C1:LSC-ETMX_EXC with a broadband white noise upto 4 kHz. The timestamps for the measurements are:
1318199043 (start) - 1318199427 (end).
We will process the measurement to compute the cavity pole and analog filter poles & zeros later. |
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Thu Oct 14 09:28:46 2021, Yehonathan, Update, PSL, PMC unlocked
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PMC has been unlocked since ~ 2:30 AM. Seems like the PZT got saturated. I moved the DC output adjuster and the PMC locked immidiatly although with a
low transmission of 0.62V (>0.7V is the usual case) and high REFL.
IMC locked immidiately but IFO seems to be completely misaligned. The beams on the AS monitor are moving quite alot syncronously. BS watchdog |
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Thu Oct 14 11:25:49 2021, Yehonathan, Update, PSL, PMC unlocked
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{Yehonathan, Anchal}
I went to get a sandwich around 10:20 AM and when I came back BS was moving like crazy. We shutdown the watchdog.
We look at the spectra of the OSEMs (attachment 1). Clearly, the UR sensing is bad. |
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Thu Oct 14 16:38:26 2021, Ian MacMillan, Update, General, Kicking optics in freeSwing measurment
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[Ian, Anchal]
We are going to kick the optics tonight at 2am.
The optics we will kick are the PRM BS ITMX ITMY ETMX ETMY |
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Thu Oct 14 20:16:22 2021, Yehonathan, Update, General, PRMI free swinging
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{Yehonathan, Raj}
We aligned the IFO in the PRMI state and let it swing freely. |
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Fri Oct 15 12:14:27 2021, Ian MacMillan, Update, General, Kicking optics in freeSwing measurment
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[Ian, Anchal]
we ran the free swinging test last night and the results match up with in 1/10th of a Hz. We calculated the peak using the getPeakFreqs2
script to find the peaks and they are close to previous values from 2016. |
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Mon Oct 18 10:02:17 2021, Koji, Update, VAC, Vent Started / Completed
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[Chub, Jordan, Anchal, Koji]
- Checked the main volume is isolated.
- TP1 and TP2 were made isolated from other volumes. Stopped TP1. Closed V4 to isolate TP1 from TP2. |
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Mon Oct 18 16:48:32 2021, Tega, Update, Electronics, Sat Amp modifications
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[S2100738, S2100745, S2100751] Completed three more Sat Amp units modification with seven remaining.
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Tue Oct 19 10:59:09 2021, Koji, Update, VAC, Vent Started / Completed
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[Chub, Jordan, Yehonathan, Anchal, Koji]
North door of the BS chamber opened
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Tue Oct 19 11:30:39 2021, Koji, Update, VAC, How to vent TP1
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I learned that TP1 was vented through the RGA room in the past. This can be done by opening VM2 and a manual valve ("needle valve")
I checked the setup and realized that this will vent RGA. But it is OK as long as we turns of the RGA during vent and bake it once
TP1 is back. |
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Wed Oct 20 15:58:27 2021, Koji, Update, VAC, How to vent TP1
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Probably the hard disk of c0rga is dead. I'll follow up in this elog later today.
Looking at the log in /opt/rtcds/caltech/c1/scripts/RGA/logs , it seemed that the last RGA scan was Sept 2, 2021, the day when we
had the disk full issue of chiara. |
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Thu Oct 21 11:38:43 2021, Jordan, Update, SUS, Standoffs for Side Magnet on 3" Adapter Ring SOS Assembly
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I had 8 standoffs made at the Caltech chemistry machine shop to be used as spacers for the side magnets on the 3" Ring assembly. This is to create
enough clearance between the magnet and the cap screws directly above on the wire clamp.
These are 0.075" diameter by .10" length. Putting them through clean and bake now. |
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Tue Oct 26 10:17:14 2021, Yehonathan, Update, BHD, SOS assembly
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Things that I need to start suspending optics:
1. Winch adapter plate (D970314). Might need to make one.
2. Quad photodetector |
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Tue Oct 26 14:53:24 2021, Koji, Update, Electronics, Rack
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1. We have a rack at the 40m storage. We are free to take it to the lab. If there is a tag, tell the info to Liz. Let's move it to the lab tomorrow
right after the meeting.
2. We have a few racks in WB B1 (Attachment 1). Liz and I checked a rack which looks suitable for us. 46U height. Caltech transport will move |
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Thu Oct 28 23:13:19 2021, Yehonathan, Update, BHD, SOS assembly
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{Tega, Yehonathan, Koji}
Suspension of a Dummy Optic
We
gathered the components needed for suspending a 2" optic housed in a 3" ring adapter: |
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Mon Nov 1 14:51:34 2021, Koji, Update, General, Checking the vent plan
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The vent team described a detailed vent plan (and reports where the actions have been performed)
https://wiki-40m.ligo.caltech.edu/vent/Fall2021
- [Sec.4] We should decide the final PR2 mirror through table-top measurements. |
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Tue Nov 2 15:02:03 2021, Yehonathan, Update, BHD, SOS assembly
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{Yehonathan, Tega}
We took the free-swinging spectra of the OpLev in the X and Y direction.
To make the motion of the optic quiet we turned off the airflow on the optical bench and moved the QPD close to the SOS so that the laser beam |
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Tue Nov 2 18:54:41 2021, Anchal, Paco, Update, BHD, Optical fibres laid for BHD upgrade
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We successfully laid down all required optical fibre fiber cables from 1X4-1X7 region to 1Y1-1Y3 region today. This includes following cables:
Timing fibre fiber from Master Timing Synchornizer D050239 on 1X6 to C1SU2
I/O chassis on 1Y1.
Timing fibre fiber from Master Timing Synchornizer D050239 |
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Tue Nov 2 22:50:30 2021, Koji, Update, BHD, SOS assembly
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2.5Hz is surprising. Can you move it down to sub 1Hz by adding a socket cap screw at the top instead of the set screw for the Teflon piece? How much
mass do you need to add? |
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Thu Nov 4 18:29:51 2021, Tega, Update, SUS, Setting up suspension test model
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[Ian,Tega]
Today we continued working on setting up the 6 degrees of freedom model for testing the suspension which we copied over from "/cvs/cds/rtcds/userapps/release/sus/c1/models/c1sup.mdl" |
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Fri Nov 5 12:49:32 2021, rana, Update, SUS, Setting up suspension test model
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Please don't put it on c1sus2. Put it on the completely independent test stand as we discussed Wednesday. You must test the controller on
the simplant and verify that they thing is stable and works, before putting it in the 40m network. |
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Fri Nov 5 20:35:10 2021, Koji, Update, BHD, Feedthru / Optical Mounts
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- New feedthrus [4xDB25 Qty 4 / 8xDB25 Qty 1] are placed on the wire shelf at the entrance -> Jordan, please clean them.
- There are plenty of 2" DLC mounts. There are also many 1.5" mounts but they are less useful.
We need at least 3 1" moounts and 1 1" or 2" lens mount (and the lens). Let's purchase them on Thorlabs. I'll work |
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Mon Nov 8 17:22:27 2021, Yehonathan, Update, BHD, SOS assembly
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Big Gluing Day
Today I glued the magnet+dumbell assemblies on the optics adapters.
Unlike magnet gluing on a 3" optic where one can use a magnet gluing fixture, here I had to position the magnets manually. There is a complication |
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Mon Nov 8 17:52:22 2021, Ian MacMillan, Update, SUS, Setting up suspension test model
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[Ian, Tega]
We combined a controler and a plant model into a single modle (See first attachment) called x1sus_cp.mdl in the userapps folder
of the cymac in c1sim. This model combines 2 blocks: the controler block which is used to control the current optics and is found |
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Tue Nov 9 11:11:37 2021, Yehonathan, Update, BHD, SOS assembly
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| The gluing was mostly successful. Only two magnets didn't stick (see attachment). |
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Fri Nov 12 23:47:29 2021, Yehonathan, Update, BHD, SOS assembly
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{Tega, Yehonathan}
First attempt at the suspension of a Lambda Optic mirror
We found the box with the 2" Lambda Optic mirrors in the cleanroom. We choose to suspend a mirror with a ROC = 5m, probably LO1. |
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Tue Nov 16 17:42:46 2021, Yehonathan, Update, BHD, SOS assembly
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{Tega, Yehonathan}
Another attempt at the suspension of a Lambda Optic mirror
The lambda mirror was removed from the adapter whose magnets were knocked off. We tried to mount the mirror on a different adapter but we knocked |
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Tue Nov 16 18:28:53 2021, Koji, Update, BHD, SOS assembly
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Yehonathan told me that the wires are touching between the clamps! I went back to the CAD and confirmed
it is really happening. Sad.
The distance of the wires at the upper clamp is 17.018mm. |
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Wed Nov 17 07:32:48 2021, Chub, Update, General, wire clamp plate mod
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This will be difficult to modify with the magnets and dumbells in place. Even if someone CAN clamp this piece into an endmill machine with the
magnets/dumbells in place, the vibration of the cutting operation may be enough to break them off. |
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Wed Nov 17 11:53:27 2021, Koji, Update, General, wire clamp plate mod
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Of course, we remove the magnet-dumbbell for machining. After that the part will be cleaned/baked again. And Yehonathan is going to glue the magnet-dumbbell
again. |
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Wed Nov 17 17:37:53 2021, Anchal, Update, General, Placed Nodus and fb1 on UPS power
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| Today I placed nodus and fb1 on UPS battery backed supply. Now power glitches should not hurt our cds system. |
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Thu Nov 18 15:16:10 2021, Anchal, Update, General, Moved Chiara to 1X7 above nodus powered with same UPS
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[Anchal, Paco]
We moved chiara to 1X7 above nodus and powered with same UPS from a battery backed port. The UPS is at 40% load capacity. The nameserver and
nfs came back online automatically on boot up. |
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Mon Nov 22 17:42:19 2021, Anchal, Update, General, Connected Megatron to battery backed ports of another UPS
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[Anchal, Paco]
I used the UPS that was providing battery backup for chiara earlier (a APS Back-UPS Pro 1000), to provide battery backup to Megatron. This completes
UPS backup to all important computers in the lab. Note that this UPS nominally consumes 36% of UPS capacity in power delivery but at start-up, Megatron |
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Tue Nov 23 18:02:05 2021, Anchal, Update, IMC, MC autolocker shifted to python3 script running in docker
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I finished copying over the current autolocker bash script functionality into a python script
which runs using a simple configuration yaml file. To run this script, one
needs to ssh into optimus and : |
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Wed Nov 24 14:15:15 2021, Yehonathan, Update, BHD, SOS assembly
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Late update. We got 2 modified side blocks from Jordan a few days ago. Yesterday, I glued a side magnet to one of the modified side blocks.
I took the opportunity to reglue some magnets that were knocked off from the adapters. I did this for 2 adapters only since w need 4 shallow
adapters and we already had 2 complete ones. |
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Wed Nov 24 14:34:15 2021, Yehonathan, Update, BHD, Saving on SUSAUX slow channels
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Koji found out that the stock for BIO Acromag modules is very low and that the lead time for ordering new ones is ~ 1-year X-o.
We figure we might need to minimize the number of modules but still keep the Acromag chassis functional.
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Tue Nov 30 17:11:06 2021, Paco, Update, General, Moved white rack to 1X3.5
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[Paco, Ian, Tega]
We moved the white rack (formerly unused along the YARM) to a position between 1X3, and 1X4. For this task we temporarily removed the hepas near
the enclosures, but have since restored them. |
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Wed Dec 1 12:57:08 2021, Yehonathan, Update, BHD, SOS assembly 7x
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{Yehonathan, Tega}
We glued some magnets onto modified side blocks. We followed pretty much the same procedure form last time. The music wires were clamped on the
side blocks away from the optic adapter. The clamps were screwed down using the low profile screws the Jordan obtained from UC components to allow maximum |
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Mon Dec 6 14:26:52 2021, Koji, Update, VAC, Pumping down the RGA section
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Jordan reported that the RGA section needs to be pumped down to allow the analyzer to run at sufficiently low pressure (P<1e-4 torr).
The RGA section was pumped down with the TP2/TP3. The procedure is as listed below.
If the pressure go up to P>1e-4 torr, we need to keep the pump running until the scan is ready. |
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Mon Dec 6 18:23:04 2021, Yehonathan, Update, BHD, SOS assembly
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I installed OSEMs on the LO1 SOS. To my surprise, the side magnet is not in the center of the side OSEM. It completely misses the LED as can be seen
in the attachment.
Looking at the CAD model, it turns out the position of the OSEM on the left side plate is different from the position of the OSEM on the right |
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Tue Dec 7 13:12:50 2021, Koji, Update, VAC, Pumping down the RGA section
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So that Jordan can run the RGA scan this afternoon, I ran TP3 and started pumping down the RGA section.
Procedure:
- Same 1~4 |
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Wed Dec 8 10:14:43 2021, Jordan, Update, VAC, Pumping down the RGA section
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After an overnight pumpdown/RGA warm up, I took a 100 amu scan of the RGA volume and subsequent pumping line. Attached is a screenshot along with the
.txt file. Given the high argon peak (40) and the N2/O2 ratio, it looks like there is a decent sized air leak somehwere in the volume.
Are we interested in the hydrocarbon leak rates of this volume? That will require another scan with one of the calibrated leaks opened. |
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Thu Dec 9 00:32:56 2021, Tega, Update, CDS, New SUS medm screen update
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The new SUS screen can be reached via sitemap -> IFO SUS button -> NEW ETMX dropdown menu link. Please use and provide feedback. Not
sure exactly if we need/want the display screens after the IOP model on the right of the medm screen. I have not been able to locate the corresponding
channels but did not want to remove them until I was sure that we don't plan to add these features to our screens. When all bugs have been ironed |
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Thu Dec 9 18:22:36 2021, Tega, Update, CDS, New SUS medm screen update
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Work on the medm screen for SUS RMS monitor is ongoing. The next step would be to incorporate this into the SUS medm screen, add
the BLRMS model to the SUS controller model, recompile, check that the channels are being correctly addressed, then load the appropriate bandpass and
lowpass filters. |