 Thu Feb 24 19:26:32 2022, Anchal, Update, General, IMC Locking
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I think I have aligned the cavity, including MC1 such that we are seeing flashing of fundamental mode and significant transmission sum value as well.However,
I'm unable to catch lock following Koji's method in 40m/16673. Autolocker could not
catch lock either. Maybe I am doing something wrong, I'll pickup again tomorrow, hopefully the cavity won't drift too much in this time. |
Fri Feb 25 14:00:08 2022, Ian MacMillan, Update, SUS, ETMY SUS Electronics Replacement 
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[Koji, Ian]
We looked at a few power supplies and we found one that was marked "CHECK IF THIS WORKS" in yellow. We found that the power supply
worked but the indicator light didn't work. I tried a two other lights from other power supplies that did not work but they did not work. Koji ordered |
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Fri Feb 25 14:48:53 2022, Ian MacMillan, Update, SUS, ETMY SUS Electronics Replacement
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I moved the network-enabled power strip from above the power supplies on rack 1y4 to below. Nothing was powered through the strip when I unplugged everything
and I connected everything to the same port after. |
 Sat Feb 26 01:01:40 2022, Tega, Update, VAC, Ongoing work to get the FRG gauges readouts to EPICs channels
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I will make a detailed elog later today giving a detailed outline of the connection from the Agilent gauge controller to the vacuum subnet and the
work I have been doing over the past two days to get data from the unit to EPICs channels. I just want to mention that I have plugged the XGS-600 gauge
controller into the serial server on the vacuum subnet. I check the vacuum medm screen and I can confirm that the other sensors did not experience and |
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Sat Feb 26 15:45:14 2022, Tega, Update, VAC, Ongoing work to get the FRG gauges readouts to EPICs channels
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I have attached a flow diagram of my understanding of how the gauges are connected to the network.
Earlier today, I connected the XGS-600 gauge controller to the IOLAN Serial Device Server on port 192.168.114.22 .
The plan is a follows: |
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Sat Feb 26 23:48:14 2022, Koji, Update, SUS, ETMY SUS Electronics Replacement
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[Ian, Koji] - Activity on 25th (Fri)
We continued working on the ETMY electronics replacement.
- The units were fixed on the rack along with the rack plan. |
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Sun Feb 27 00:37:00 2022, Koji, Update, General, IMC Locking Recovery
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Summary:
- IMC was locked.
- Some alignment change in the output optics. |
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Sun Feb 27 01:12:46 2022, Koji, Update, General, IMC manual alignment procedure
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We expect that the MC sus are susceptible to the temperature change and the alignment drifts away with time.
Here is the proper alignment procedure.
0) Assume there is no TEM00 flash or locking, but the IMC is still flashing with higher-order modes. |
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Mon Feb 28 15:51:07 2022, Ian MacMillan, Update, SUS, ETMY 1Y4 Electronics Replacement
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[Paco, Ian]
paco helped me wire the ETMY 1Y4 rack. We wired the following (copied from Koji's email):
Use DB9-DB9 to complete the wiring between
16bit DAC AI Chassis - End DAC Adapter (4 cables)
End DAC Adapter |
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Mon Feb 28 19:15:10 2022, Tega, Update, VAC, Ongoing work to get the FRG gauges readouts to EPICs channels
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I decided to create an independent service for the XGS data readout so we can get this to work first before trying to integrate into current system.
After starting the service, I noticed that the EPICS channel were not updating as expected. So I started to debug the problem and managed to track it down
to an ip socket connect() error, i.e. we get a connection error for the ip address assigned to the LAN port to which the XGS box was connected. After trying |
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Tue Mar 1 16:01:14 2022, Paco, Update, Electronics, RFSoC 2x2 board -- setup for remote work & BALUN saga
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[Tommy, Paco]
Since last week I've worked with tommy on getting the RFSoC 2x2 board to get some TFs from simple minicircuits type filters. The first thing
I did was set up the board (which is in the office area) for remote access. I hooked up the TCP/IP port to a wall ethernet socket (LIGO-04) and the caltech |
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Tue Mar 1 19:26:24 2022, Koji, Update, SUS, ETMY SUS Electronics Replacement
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The replacement key switches and Ne Indicators came in. They were replaced and work fine now.
The power supply units were tested with the X end HeNe display. It turned out that one unit has the supply module for 1350V 4.9mA while the other
two do 1700V 4.9mA. |
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Tue Mar 1 20:38:49 2022, Tega, Update, VAC, Ongoing work to get the FRG gauges readouts to EPICs channels
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During my investigation, I inadvertently overwrote the serial port configuration for the connected devices. So I am now working to get it all back. I
have attached screenshots of the config settings that brought back communication that is not garbled. There is no physical connection to port 6, which
I guess was initially used for the UPS serial communication but not anymore. Also, ports 9 and 10 are connected to Hornet and SuperBee, both of which |
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Wed Mar 2 11:50:39 2022, Tega, Update, VAC, Ongoing work to get the FRG gauges readouts to EPICs channels
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Here is the IOLAN SDS TCP socket setting and the USBserial setting for comparison.
I have also included the python script and output from the USBserial test from earlier. |
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Wed Mar 2 12:40:08 2022, Tega, Update, VAC, Ongoing work to get the FRG gauges readouts to EPICs channels 6x
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Connector Test:
A quick test to rule out any issue with the Ethernet to Serial adapter was done using the setup shown in Attachment 1. The results rule out any
connector problem. |
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Wed Mar 2 14:02:43 2022, Yehonathan, Update, BHD, Re-susspension of AS1
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Yesterday, I rebuilt the OpLev setup in the cleanroom in order to suspend AS1. It took me a while to find all the necessary parts but I found them in
the end.
The HeNe laser was placed on the optical table and turned on. The beam was aimed to bounce off a folding mirror to the SOS tower. |
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Thu Mar 3 04:11:36 2022, Koji, Update, SUS, ETMY 1Y4 Electronics Replacement
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For the Y-end electronics replacement, we want to remove unused power supplies. In fact, we already removed the +/-5V supplies from the stack. I was
checking what supply voltages are used by the Eurocard modules. I found that D990399 QPD whitening board
had the possible use of +/-5V. |
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Thu Mar 3 04:24:23 2022, Koji, Update, SUS, ETMY 1Y4 Electronics Replacement
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The DC power strip at Y-end was connected to the bottom two Sorensen power supplies. They are configured to provide +/-18V.
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Thu Mar 3 17:09:46 2022, Paco, Update, BHD, Re-susspension of AS1
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[Anchal, Paco]
Wire clamp spare was installed, furthermore AS1 was reinstalled on adapter, attached wire clamps, and cleaned using ionized air gun. Finally,
we suspended it on the SOS tower and left it resting on the bottom earthquake stops; ready for balancing. |
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Thu Mar 3 17:21:11 2022, Ian MacMillan, Update, SUS, ETMY 1Y4 Electronics Replacement
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[Koji, Ian]
1) We attached the 30 coil driving cables to the vacuum feed through to the sat amp [40m
wiki] they run along the cable tray then up and down into the rack. |
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Fri Mar 4 18:12:44 2022, Koji, Update, VAC, RGA pumping down
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1. Jordan reported that the newly installed Pirani gauge for P2 shows 850Torr while PTP2 show 680 Torr. Because of this, the vacuum interlock fails when
we try to open V4.
2. Went to c1vac. Copied the interlock setting file interlock_conditions.yaml to interlock_conditions_220304.yaml |
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Sat Mar 5 02:03:46 2022, Koji, Update, SUS, ETMY 1Y4 Electronics Replacement 6x
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Oplev saga
Summary
- The new coil driver had not enough alignment range to bring the oplev beam back to the QPD center |
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Sun Mar 6 18:14:45 2022, Tega, Update, VAC, Ongoing work to get the FRG gauges readouts to EPICs channels
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Following repeated failure to establish communication between c1vac and the XGS600 controller via Perle IOLAN serial device server, I decided to monitor the
signal voltage of the communication channels (pin#2, pin#3 and pin#5) using an oscilloscope. The result of this investigation is presented
in the attached pdf document. In summary, it seems I have used a crossed wired RS232 serial cable instead of a normal RS232 serial cable, so the c1vac |
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Mon Mar 7 10:06:32 2022, Yehonathan, Update, IOO, IMC unlocked again, completely misaligned
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Came this morning and saw that the IMC is unlocked.
Went into MC Lock screen and see that the watchdog is down and the PSL shutter is closed. I tried to open the shutter but nothing happened -
no REFL signal or beam on the MC REFL camera . |
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Mon Mar 7 13:53:40 2022, Tega, Update, VAC, Ongoing work to get the FRG gauges readouts to EPICs channels
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So it appears that my deduction from the pictures of needing a cable swap was correct, however, it turns out that the installed cable was actually
the normal RS232 and what we need instead is the RS232 null cable. After the swap was done, the communication between c1vac and the XGS600 controller became
active. Although, the data makes it all to the to c1vac without any issues, the scope view of it shows that it is mainly utilizing the upper half of |
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Mon Mar 7 14:52:34 2022, Koji, Update, VAC, Ongoing work to get the FRG gauges readouts to EPICs channels
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Great trouble shoot!
> I guess, the only remaining issue now is the incorrect atmospheric pressure reading of 1000 Torrs.
This is just a calibration issue. The controller should have the calibration function. |
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Mon Mar 7 14:55:33 2022, Koji, Update, IOO, IMC unlocked again, completely misaligned
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Hmm, the bias values were reset at 2022-03-03-20:01UTC which is 2022-03-03-12:01 PST with no apparent disruption of the data acquisition (= no resetting
of the RTS). Not sure how this could happen.
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Mon Mar 7 16:44:15 2022, Ian MacMillan, Update, SUS, ETMY SUS Electronics Replacement 6x
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Now that the ETMSUS is back up and running I reran my measurements from the beginning of the
process. The results below show a change in gain between the before and after measurements. I have given values of the low-frequency section below.
Average Gain difference from the TFs: 18.867 (excluding thee side change) |
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Mon Mar 7 16:56:08 2022, Yehonathan, Update, BHD, Re-susspension of AS1
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{Paco, Yehonathan}
We tried to roughly balance the adapter with two counterweights at the front, like with the other thin optics using an iris. As before, we couldn't
get the beam above the iris hole no matter how much we inserted the counterweights into the adapter. We noticed that one of the side blocks is actually |
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Mon Mar 7 18:53:16 2022, Koji, Update, BHD, Re-susspension of AS1
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Not sure if that small difference can cause the alignment inability. Particularly, the removed metal was just below the wire. This means that there is
no misalignment effect at the first order.
Here is my idea: |
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Tue Mar 8 12:08:47 2022, Tega, Update, VAC, Ongoing work to get the FRG gauges readouts to EPICs channels
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OMG, it worked! It was indeed a calibration issue and all I had to do was press the "OK" button after selecting the "CAL" tab beside
the pressure reading. Wow.
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Tue Mar 8 12:24:13 2022, Yehonathan, Update, BHD, Re-susspension of AS1
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The gluing seemed to be successful. I assembled the side block with the magnet on the adapter. Paco helped me hang the adapter on the SOS tower.
The height and roll of the adapters were balanced (attachment 1,2).
The QPD was placed at the beam reflection. The beam was centered horizontally on the QPD and then measured vertically. The pitch DOF was balanced |
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Tue Mar 8 19:29:36 2022, Paco, Update, BHD, Re-balance of AS1
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[Paco]
Installed AS1 in vacuum, near the center of the table, and installed the OSEMs. All OSEMS are "balanced" nominally, i.e. their shadow
is at the halfway point optimum, but fine tuning is required, which I will attempt tomorrow after restoring the AS1 suspension screen settings. Today, |
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Wed Mar 9 09:35:26 2022, Paco, Update, BHD, Re-balance of AS1
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[Paco]
AS1 is installed, OSEMs balanced, and the optic damped successfully. We should run the free swinging test overnight to validate this re-installation. |
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Wed Mar 9 10:23:28 2022, Jordan, Update, VAC, Leak Testing of New Manual Gate Valve - Attempt #1
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Jordan, Chub, Paco
Chub and I went into the lab this morning to leak check the new gate valve after pumping over the weekend. This would be done through the RGA
and spraying helium around the newly installed flanges. The RGA is set to monitor the partial pressure of helium versus time and we visually watch for |
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Wed Mar 9 11:52:18 2022, Yehonathan, Update, BHD, Simplified BHD readout sketch on ITMY table
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I have made an editable draw.io diagram of the planned
simplified BHD setup on the ITMY table (see attached). 10 pts = 1 inch.
This is very sketchy but easily adjustable since we are removing everything but the ITMY Oplev from that table. |
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Wed Mar 9 12:57:52 2022, Koji, Update, BHD, Simplified BHD readout sketch on ITMY table
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- BHD beams were already mixed in the chamber. So we don't need a BS on the table. (Probably there is no BS already)
- We don't need to split each BHD beam. One PD per BHD beam is OK for now.
- Check if the BHD paths have reasonable angles from the windows so that the beams do not hit the chamber wall. |
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Thu Mar 10 09:39:59 2022, Jordan, Update, VAC, Leak Testing of New Manual Gate Valve - Attempt #2
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This morning Chub and I leak checked the manual gate valve with the RGA and helium. There was no change in the helium partial pressure while spraying
helium around the flanges, all looks good.
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Thu Mar 10 10:05:49 2022, Paco, Update, SUS, AS1 free swing test
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[Paco, Ian]
Begin free swinging test for AS1 at 10:05 AM, set for ~ 2.04 hours.
Test failed because damping failed to disable.
Restart
free swinging test for AS1 at 15:06, set for 2.04 hours.
Success (Attachment #1 shows the DOF |
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Fri Mar 11 16:43:03 2022, Ian MacMillan, Update, SUS, ETMY SUS Electronics Replacement
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I updated the gain of the ct2um filter on the OSEMS for ETMY and decreased their gain by a factor of 9 from 0.36 to 0.04.
I added a filter called "gain_offset" to all the coils except for side and added a gain of 0.48.
together these should negate the added gain from the electronics replacement of the ETMY |
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Tue Mar 15 10:45:31 2022, Paco, Update, General, Assembled small in-vac optics
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[Paco]
This morning I assembled LO3, LO4 and AS3 (all mirrors) onto polaris K1 mounts. The mounts stand as per this
elog, on 4.5" posts with 0.5" Al spacers to match the beam heigth of 5.5". I also assembled ASL by adding a 0.14" |
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Thu Mar 17 11:40:41 2022, Paco, Update, SUS, ETMY green PZT HV supply
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[Anchal, Paco]
We installed a HV kepco power supply for the green PZT steering the YAUX beam. We did this in anticipation of the YARM alignment to take place
this afternoon. We borrowed an unused DC power supply labeled "OMC Power spply" and made an appropriate SMA connection (Attachment #1), |
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Thu Mar 17 16:50:53 2022, Paco, Update, BHD, XARM AUX alignment
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[Ian, Paco]
We opened the ITMX chamber and
Inspected PR2 and LO1 and didn't see anything suspicious.
Took the EQ stops off ITMX in preparation for alignment
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Fri Mar 18 17:15:19 2022, Paco, Update, BHD, XARM AUX alignment cont.
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[Paco, Ian]
First, we re-balanced the ITMX OSEMs so that they would damp at around half-a-shadow.
Then, we set up a clean camera inside ITMX chamber looking at the ITMX optic. Then, using the live feed we aligned the AUX beam from |
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Mon Mar 21 14:22:52 2022, Anchal, Update, SUS, ETMY Alignmnet offsets needed to be changed
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I'm not sure why but the PIT and YAW offset values of +2725 and -2341 were not sufficient for the reflected OPLEV beam to reach the OPLEV QPD. I
had to change the C1:SUS-ETMY_PIT_OFFSET to 5641 and C1:SUS-ETMY_YAW_OFFSET to -4820 to come back to center of the OPLEV QPD. We aligned the Oplevs to
center before venting, so hopefully this is our desired ETMY position. |
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Mon Mar 21 18:00:05 2022, Ian MacMillan, Update, BHD, XARM AUX alignment cont.
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[Ian, Paco]
Continuing with the previous alignment that we stoped on friday, we re set up my heavily cleaned iPhone on FaceTime. The Phone alowed us to see
the laser on the ITMX and center it on that optic. |
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Fri Mar 25 11:39:14 2022, Anchal, Update, SUS, ETMY SUS Electronics Replacement - Questions
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After Ian updated the cts2um filters for OSEM, shouldn't the damping gains be increased back by factor of 10 to previos values? Was the damping gain
for SIDE ever changed? we found it at 250.
Can you explain why gain_offset filter was required and why this wasn't done for the side coil? |
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Mon Mar 28 16:25:34 2022, Ian MacMillan, Update, SUS, ETMY SUS Electronics Replacement - Questions
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The point of changing the gains was to return the system to its origional state. ie I wanted the over all gain of the physical components to be the same
as when we started. From the CDS side of things nothing else should be changed. The damping filters should remain at their origional values. The cts2um
filter was changed to counteract a change in the electronics (replacing them). These changes should cancel eachother out. As for the side control, on 3/4/22 |
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Tue Mar 29 17:35:54 2022, Paco, Update, SUS, Damping fix on BS, AS4, PR2, and PR3
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[Ian, Paco]
We removed the "cheby" filters from AS4, PR2 and PR3 which had been misplaced after copying from the old SUS models. After
removing them, the new SOS damped fine. Note that because of the Input matrices, the filters have to be enabled all at once for the MIMO loop to make sense.
We |
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Fri Apr 1 14:26:50 2022, Tega, Update, Optical Levers, Simplified sketch on MC table
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Here is an early sketch of the MC table.
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