 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. |
 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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Fri Apr 1 17:02:02 2022, Koji, Update, Optical Levers, Simplified sketch on MC table
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We are supposed to have BS Oplev Beams. We don't like the shallow angle reflections (i.e. AOI>45deg).
The laser is too big but I suspect the other components are too small. So it'd be check the actual size of the components including the optical
mounts that are missing on the figure so far. |
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Fri Apr 1 22:22:29 2022, Koji, Update, Optical Levers, Simplified sketch on MC table
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Possibility to swap BS and ITMX tables:
BS table, which Tega said MC table, is 2ft x 4ft. The ITMX table is 3ft x 5ft and only the central 2ft x 4ft area is used. The area around the BS
table is the narrowest for the east arm. We need at least (2+delta) ft of the hallway width so that we can move the instrument. I'm not yet sure if |
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Mon Apr 4 15:49:06 2022, Tega, Update, Optical Levers, Simplified sketch on BS table
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| I have updated the BS table using feedback from Koji and Paco and the attached pdf document is the latest iteration. |
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Thu Apr 7 11:47:22 2022, Yehonathan, Update, BHD, Initial BHD modeling: AS - LO mode matching
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I begin modeling the initial BHD setup using Finesse. I started with copying C1_w_BHD.kat from the 40m/bhd
repo and making changes to reflect the current BHD setup: |
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Thu Apr 7 20:33:42 2022, Tommy, Update, Electronics, RFSoC 2x2 board -- setup for remote work
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To access the board remotely through the 40m lab ethernet port, use
ssh -N -L localhost:1137:localhost:9090 xilinx@<ip_address>
Then in the browser go to |
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Thu Apr 7 20:37:06 2022, Tommy, Update, Electronics, RFSoC 2x2 Board -- Simple Tone Generator
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In the "Tommy" sub folder, I created a new notebook called "SimpleToneGenerator". This tunes the DAC and ADC mixers to a single frequency
and reads off the Time Series and Fourier components. We can alos easily check the demodulation scheme and implement butterworth filters to check their
function. |
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Thu Apr 7 20:41:15 2022, Tommy, Update, Electronics, RFSoC 2x2 Board -- Gain Plotter
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In this file (under Tommy), we have a notebook which runs through a spectrum of frequencies and determines the gain response of the attached filter.
Below we have the output of a high pass filter. We use IQ demodulation to change IQ componets to DC. Then using a butterworth filter, we read out the DC
components and determine the gain's magnitude and phase. However, the phase seems very noisy. This is because the oscillators in the different tiles |
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Thu Apr 7 21:15:04 2022, Yehonathan, Update, BHD, Initial BHD modeling: AS - LO mode matching
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Ok, it turns out these optics were purchased on purpose, as this elog shows. Jon considered
building a mode-matching telescope with stock optics as an initial step before purchasing the custom optics (referred to as "design" optics in
my elog). |
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Fri Apr 8 16:03:58 2022, rana, Update, Electronics, RFSoC 2x2 board -- setup for remote work & BALUN saga
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Seems like it should be possible to just remove the transformer (aka as a BALUN ... BALanced, UNbalanced), or replace it with a lower frequency part.
Its just a usual mini-circuits part. Maybe you can ask Chris Stoughton about this and ask Tommy to checkout some of the RFSoC user forums for how to go
to DC. |
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Mon Apr 11 11:00:30 2022, Jancarlo, Update, VAC, C1VAC Reboot and Nitrogen tanks
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[Paco, JC, Ian, Jordan, Chub]
Checking in the morning, I walked over to the Nitrogen tanks to check the levels. Noticed one tank was empty, so I swapped it out. Chub came
over to check the levels and to take note of how many tanks were left available for usage (None). Chub continued to put in a work order for a set of full |
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Tue Apr 12 09:05:21 2022, Jordan, Update, VAC, New Pressure Gauge Install/Pump Spool Vent 6x
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Today, Tega and I would like to vent the pump spool an dinstall the new FRG-400 Agilent Pressure Gauges (per elog 15703). The attached picture shows
the volume needed to be vented highlighted in red, and the gauges that need to be replaced/removed (purple dot next to the name).
The vent plan is as follows: |
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Wed Apr 13 12:50:07 2022, Tega, Update, VAC, New Pressure Gauge Install/Pump Spool Vent
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[Jordan, JC, Tega]
We have installed all the FRGs and updated the VAC medm screens to display their sensor readings. The replacement map is CC# -> FRG#, where
# in [1..4] and PRP1 -> FRG5. We now need to clean up the C1VAC python code so that it is not overloaded with non-function gauges (CC1,CC2,CC3,CC4,PRP1). |
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Wed Apr 13 15:57:25 2022, Ian MacMillan, Update, Cameras, Camera Battery Test
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Tested the Nikon batteries for the camera. they are supposed to be 7V batteries but they don't hold a charge. I confirmed this with multi-meter after
charging for days. Ordered new ones Nikon EN-EL9 |
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Wed Apr 13 16:23:54 2022, Ian MacMillan, Update, General, Smell in 40m
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[Ian, Paco, JC]
There is a strange smell in the 40m. It smells like a chemically burning smell maybe like a shorted component. I went around with the IR
camera to see if anything was unusually hot but I didn't see anything. The smell seems to be concentrated at the vertex and down the y-arm |
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Wed Apr 13 18:55:54 2022, Koji, Update, Cameras, Camera Battery Test
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I believe that the Nikon has an exposure problem and that's why we bought the Canon.
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Thu Apr 14 09:04:30 2022, Jordan, Update, VAC, RGA Volume RGA Scans
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Prior to venting the RGA volume on Tuesday (4/12/2022) I took an RGA scan of the volume to be vented (RGA+TP1 volume+Manual Gate Valve) to see if there
was a difference after replacing the manual gate valve. Attached is the plot from 4/12/22, and an overlay plot to complare 4/12/22 to 12/10/2021, when
the same volume was scanned with the old (defective) manual gate valve. |
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Fri Apr 15 11:59:16 2022, Yehonathan, Update, IOO, IMC completely misaligned
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Came this morning, opened the PSL and there was not even a beam on the MC REFL.
Looking at the big monitor it seems like the WFS signals went through the roof during the "auto-alignment" night session.
I restored the MC alignment from before the misalignment happen and wait for the SUS to damp. Once the RMS values went below 200 I enabled the |
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Mon Apr 18 15:17:31 2022, Jancarlo, Update, General, Tool box and Work Station Organization
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I cleaned up around the 40 m lab. All the Laser Safety Glasses have been picked up and placed on the rack at the entrance.
Some miscellaneous BNC Connector cables have been arranged and organized along the wall parallel to the Y-Tunnel.
Nitrogen tanks have been swapped out. Current tank is at 1200 psi and the other is at 1850 psi. |
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Mon Apr 18 16:09:07 2022, Yehonathan, Update, BHD, BHD Readout simulation
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I'm planning on simulating the BHD readout noise in a manner very similar to the ALS noise model using Simulink. I've made a sketch of the model
for the longitudinal DOFs (attached). A model for ASC will be similar but with more measurement devices (OpLevs, QPDs, WFSs).
I'm not pretending to simulate everything in this diagram on the first go, it is just a sketch of the big picture. |
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Mon Apr 18 23:22:39 2022, Koji, Update, General, Tool box and Work Station Organization
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| Whoa! Thanks! |
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Tue Apr 19 18:10:10 2022, Paco, Update, BHD, Part V of BHR upgrade - POX11 path, LO path, and ITMX Oplev
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[Yuta, Paco]
We set up POX11 beam path from ITMX chamber to the ITMX in-air table. To do this, we first identified the POX reflection on the ITMX chamber,
and then steered the POXM1 (in the BSC) by hand until we cleared the viewport. We also checked that the POX beam is centered on POXM1. |
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Wed Apr 20 08:20:22 2022, Paco, Update, BHD, Part V of BHR upgrade - PR2 weirdness
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Yesterday, I tried tuning the PR2 damping gains by increasing the gain until the damping gave the ~5 oscillations (by watching the damped motion using
StripTool, and keeping an eye on the PD var). I noticed that often when I changed the gain, some OSEM sensors shifted (gained an offset!!) and the PD var
values changed, typically increasing at higher damping gains. I reverted the changes until the PD var looked "normal" again (~ 2 mV) but it is |
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Wed Apr 20 14:56:06 2022, Tommy, Update, Electronics, RFSoC 2x2 board -- setup for remote work & BALUN saga
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Here are a few options for replacement BALUNs from Mini Circuits and specs:
Current. TCM1-83X+, 10-8000 MHz, 50 Ohms, Impedance Ratio 1, Configuration K
1. Z7550-..., DC-2500 MHz (some DC-2300), 50/75 Ohms, Impedance Ratio 1.5, Configuration Q. There are various types of the Z7550 which have different |
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Wed Apr 20 16:11:08 2022, Koji, Update, SUS, Outpur resistors updated for LO1 coil drivers / for SR2, LO2, AS1, and AS4 in progress 6x
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[JC Koji]
To give more alignment ranges for the SUS alignment, we started updating the output resistors of the BHD SUS coil drivers.
As Paco has already started working on LO1 alignment, we urgently updated the output Rs for LO1 coil drivers. |
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Wed Apr 20 18:50:03 2022, Koji, Update, BHD, Part V of BHR upgrade - PR2 weirdness
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It seemed that it comes from the servo oscillation. This does not happen when the output limitters were set to be 100-ish. But even so the gains looked
quite low.
I turned on the Cheby rool-offs for all the DOFs, and this allowed me to increase the damping gain A LOT. |
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Thu Apr 21 10:35:23 2022, Koji, Update, CDS, DAQ seemed down
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Yesterday, when I worked on the damping servo, I found that any of the daqvtools (ndscope, dtt, dataviewer,...) is not available. We may need to
restart the fb and rt machines. |
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Thu Apr 21 11:31:35 2022, JC, Update, VAC, Gauges P3/P4
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[Jordan, JC]
It was brought to attention during yesterday's meeting that the pressures in the vacuum system were not equivalent althought the valve were
open. So this morning, Jordan and I reviewed the pressure gauges P3 and P4. We attempted to recalibrate, but the gauges were unresponsive. Following this, |