 Wed Jun 8 16:33:26 2022, Koji, Update, General, Power Outage 220608: HVAC restored
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| I found the HVACs for the ends were off. They were turned back on. |
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Wed Jun 8 16:57:46 2022, Koji, Update, IOO, Power Outage 220608: IMC restored
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The IMC alignment was restored and the IMC is nicely locking.
Once the vacuum level recovered P<1e-4 torr, the PSL shutter was able to be opened.
The IMC was still flashing, so the lock to TEM00 was possible. |
 Wed Jun 8 18:16:20 2022, yuta, Update, SUS, ITMY ULCOIL mystery: Coil driver swap test 
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To see if the ULCOIL channel of the ITMY coil driver is working or not, I swapped ITMY coil
driver and ITMX coil driver by swapping DB15 cable (see Attachment #2).
With this swap, I confirmed that ITMX can be kicked with C1:SUS-ITMY_ULCOIL_OFFSET, |
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Thu Jun 9 23:08:39 2022, rana, Update, SUS, ITMY ULCOIL mystery: Coil driver swap test
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what was the result of the inductance measurement? should be ~3.3 mH as measured from the flannge or cable that goes to the flange from sat amp.
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Fri Jun 10 13:02:14 2022, yuta, Update, SUS, ITMY ULCOIL mystery: Coil driver swap test
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ITMY ULCOIL was measured to have ~3.3 mH as measured from the flange. RTFE 40m/16896 .
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Fri Jun 10 13:52:22 2022, JC, Update, OPLEV Tables, ITMX, ITMY, and Vertex Table Beam Paths
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I have at taken photos and added arrows which signify the beam paths for ITMX, ITMY, and Vertex
Oplev tables. |
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Fri Jun 10 15:02:04 2022, yuta, Update, SUS, Servo gain sign flipped for MC1 WFS relief
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The servo gain for MC1 in /opt/rtcds/caltech/c1/Git/40m/scripts/MC/WFS/reliefWFS was flipped to account for COIL_GAIN flip done in 40m/16898.
The reliefWFS script now works fine.
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Fri Jun 10 15:04:23 2022, rana, Update, SUS, ITMY ULCOIL mystery: Coil driver swap test
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Its good that the inductance test passed. This means that the coil is OK. How does the inspection photo look? This is the one you guys took of the ITM
OSEM that shows the position of the magnet w.r.t. the coil. Also, how does the free swinging spectra look? Either one of these might indicate a broken
magnet, or a sticky EQ stop. |
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Fri Jun 10 20:11:46 2022, yuta, Update, ASC, Yarm ASS re-tuning in progress
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[Anchal, Yuta]
We tried to re-tune Yarm ASS today. It cannot be fully closed as of now. I think we need to play with signs. |
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Fri Jun 10 21:10:01 2022, yuta, Update, SUS, ITMY ULCOIL mystery: Coil driver swap test
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We checked the photos we have, but we didn't have the photos which show ULCOIL situation clearly.
Free swing of ITMY (and others) will be done this weekend to see the OSEM spectra and resonant frequencies. |
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Mon Jun 13 20:26:09 2022, yuta, Update, ASC, Yarm ASS re-tuning in progress -part 2-
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[Anchal, Yuta]
We are still in the progress of re-commissioning Yarm ASS. |
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Tue Jun 14 08:41:36 2022, JC, Update, OPLEV Tables, BS Oplev Table Sketch
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[JC]
Lately, I have been working on a 3d sketch of the BS OPLEV Table on SolidWorks. This is my progress so far, a few of the components I will have
to sketch myself, such as the HeNe laser and photodiodes. This will just be a general layout of the HeNe laser, optics, and photodiodes. |
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Tue Jun 14 18:45:43 2022, Anchal, Update, SUS, LO2 lower magnets are stuck in coil, won't come off
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[Anchal, Yuta]
In the weekend, I ran a free swing test on all optics. During this test, LO2 magnets got stuck to the coil because LO2 PIT alignment was very
high, making its lower OSEMs almost fully dark and upper OSEMs almost fully bright. Today we realized that LO2 |
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Tue Jun 14 19:34:06 2022, yuta, Update, SUS, Resonant frequency identification from the free swing test 7x
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[JC, Anchal, Yuta]
We are working on resonant frequency idendification from the free swing test done last weekend.
Table below is the resonant frequencies identified, and attached are the plots of peak identification for some of our new suspensions. |
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Tue Jun 14 20:57:15 2022, Anchal, Update, ASC, Yarm ASS working now
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I finally got YARM AS to work today. It is hard to describe what worked, I did a lot of monkey business and some dirty offset measurements to create
the ASS output matrix that gave results. Note that I still had to leave out ITMY PIT L error signal, but transmission was maximizing without it. The beam
does not center fully on ITMY in Pit direction right now, but we'll mvoe on from this problem for now. Future people are welcome to try to make it |
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Wed Jun 15 07:26:35 2022, JC, Update, VAC, Beginning Pumpdown
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[Jordan, JC]
Jordan and I went in to retore the Vacuum System back to it's original state before the power loss on June 8, 2022. The process went smoothly
as we first closed V7 and opened VM3 (in that order). |
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Wed Jun 15 15:03:41 2022, Koji, Update, PSL, PMC input beam aligned
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The commissioners complained about the PMC alignment. The PMC input beam was aligned. It made the transmission improved from 0.72 to 0.74.
FYI: Which steering mirrors do we use for the PMC beam alignment?
The mounts are indicated with the red arrows in Attachment 2. |
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Wed Jun 15 15:07:07 2022, Koji, Update, SUS, LO2 SUS stuck fixed
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I checked the state of the LO2 suspension. I found that the coil driver Enable Mon was all red.
Meaning, the actuation signals were not delivered to the coil driver. I wasn't sure if this was intentional or not.
Enabled the coils with "WD Master" Shutdown -> Normal. |
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Wed Jun 15 15:45:37 2022, yuta, Update, SUS, LO1 LLCOIL now working, it was loose connection
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We tracked the issue of LO1 LLCOIL not actuating LO1, and found that the DB9 cable from the coil driver to the sat amp was loose.
I tightened the screws and now it is working.
Never ever connect cables without screwing the connectors tightly! |
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Wed Jun 15 17:03:17 2022, yuta, Update, SUS, ITMY ULCOIL issue solved, loose connection in sat amp box
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[Anchal, Yuta]
We fixed the issue of ITMY ULCOIL not driving ITMY by replacing one of the 64pin ribbon cable in the satellite amplifier box. |
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Thu Jun 16 15:29:03 2022, yuta, Update, PSL, PMC input beam aligned again, IMC
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[Paco, Tomislav, Yuta]
Somehow, when we were trying to measure WFS open loop transfer functions, PMC unlocked many times for the past two hours and PMC transmission got |
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Thu Jun 16 17:40:15 2022, Yehonathan, Update, BHD, Comparison of MICH OLTF model with measurement
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I made some progress in modeling MICH loop.
Putting all the LSC and SUS filters together with the MICH Finesse model I constructed an OLTF model and plot it with the measurement done by
Paco and Yuta in this elog (attachment 1). |
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Thu Jun 16 18:30:07 2022, Anchal, Update, SUS, New diagonalized input matrices applied
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I used the same fre swing data to diagnolize input matrices of following optics:
MC1, MC2, MC3
BS ETMX ETMY |
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Thu Jun 16 19:49:48 2022, Cici, Update, General, Using the SR785
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[Deeksha, Cici]
We used a python script to collect data from the SR785 remotely. The SR785 is now connected to the wifi network via Ethernet port 7. |
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Fri Jun 17 12:05:32 2022, Yehonathan, Update, BHD, Comparison of MICH OLTF model with measurement
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I should write down what I didn't include for completeness:
1. AA filters
2. AS55 input 60Hz comb filter |
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Fri Jun 17 13:07:08 2022, Koji, Update, BHD, Comparison of MICH OLTF model with measurement
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I'm curious why the actual OLTF included the 60Hz comb...? It is undesirable to have such structure in the OLTF around the UGF as it can cause servo
instability.
And if you remove them, you don't need to model them :-) |
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Fri Jun 17 16:22:21 2022, yuta, Update, LSC, Actuator calibration of BS. ITMX, ITMY, updated MICH displacement spectra from c1cal 6x
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Following what we have done in 2013 (40m/8242), actuator calibration was done using MICH.
AS55_Q in MICH : 9.74e8 counts/m
BS : 26.08e-9 /f^2 m/counts |
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Mon Jun 20 19:46:04 2022, Tomislav, Update, ASC, Simulation plots
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| In the attachment please find IMC ASC simulation plots. Let me know what you think, if you want some other plots, and if you need any clarification. |
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Tue Jun 21 08:36:50 2022, Anchal, Update, SUS, Diagonalized input matrices for LO1, freeSwing on ITMY and ITMX
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Over the weekend, I ran freeSwing test with sequential kicks in specific DOFs for LO1, ITMY, ITMX. LO1 results were successfully used to diagonalize
LO1 input matrix. There are some issues for ITMY, ITMX still. I could not run LO2 test.
LO1
The free swing test ran successfully, resonant frequencies for different DOFs was extracted, and new |
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Tue Jun 21 18:41:46 2022, Tomislav, Update, ASC, Simulation plot
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In the attachment please find a comparison of error signals of simulation and reality. For C1:IOO-WFS1/2_PIT_IN1 excess signal ('belly') between
a few Hz up to 70-80 Hz might be caused by air turbulence (which is not included in the simulation). |
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Tue Jun 21 21:17:16 2022, yuta, Update, BHD, RTS models for BHD added but PCIE error remaining
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[Anchal, Yuta]
RTS models for BHD homodyne phase control (c1hpc) and angular control (c1bac) are created and added to c1sus2.
c1su2 and c1lsc models were modified accordingly. |
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Tue Jun 21 22:22:37 2022, Tomislav, Update, ASC, Plots
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| In the attachment please find a comparison of error signals of simulation and reality after including air turbulence as input noise. |
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Wed Jun 22 14:44:03 2022, Anchal, Update, BHD, Fixed DC error in c1su2, added new library model for suspensions
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The 0x2000 error in c1su2 happens whenever we make it and install it as the default data acquisition rates are too much in the suspension model. Earlier
we used activateSUS2DQ.py to fix this. I followed the suggestion in 40m/16537 to include COIL_OUT
at 16k, damping channels at 256 Hz and OL channels at 1024 Hz. I created new suspension model at /cvs/cds/rtcds/userapps/trunk/sus/c1/models/lib/sus_single_control_new.mdl. |
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Wed Jun 22 18:55:31 2022, yuta, Update, LSC, Daily alignment work; POY trouble solved
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[Koji, Yuta]
I found that Yarm cannot be locked today. Both POY11 and POYDC were not there when Yarm was aligned, and ITMY needed to be highly misaligned to |
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Wed Jun 22 19:41:13 2022, Koji, Update, LSC, Daily alignment work; POY trouble solved
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| Before the final measurement of the DC values for the transmissions, I aligned the PMC. This made the PMC trans increased from 0.67 to 0.74. |
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Thu Jun 23 15:05:01 2022, Water Monitor, Update, Upgrade, Water Bottle Refill
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| 22:05:02 UTC Jordan refilled his water bottle at the water dispenser in the control room. |
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Fri Jun 24 12:13:16 2022, JC, Update, IOO, WFS issues
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[Yuta, JC]
It seems that early this morning MC got very misaligned. Yuta was able to align the Mode Cleaner again by individually adjusting the MC1 MC2,
and MC3. Once transmission reach ~12000, we went ahead and turned on WFS. Oddly enough, the transmission began plummeting and MC fell out of lock. After |
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Fri Jun 24 13:29:37 2022, Yehonathan, Update, General, OSEMs from KAGRA
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The box was given to Juan Gamez (SURF)
Quote:
I put the box containing |
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Fri Jun 24 17:16:59 2022, Paco, Update, ALS, XAUX cable in control room
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[JC, Paco]
We took the long BNC cable that ran from ETMX to ETMY and ran it from ETMX into the control room instead. This way Cici and Deeksha can send
small voltage signals to the AUX PZT and read back using the beatnote pickoff that is usually connected to the spectrum analyzer. |
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Sat Jun 25 14:29:48 2022, Anchal, Update, IOO, WFS issues
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This issue is very weird and still unresolved. Without WFS loops, we'll have to realign IMC often and we might loose IMC alignment completely during
weekends or long weekends.
I tried following things today but nothign worked: |
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Sat Jun 25 20:23:59 2022, Koji, Update, IOO, WFS issues
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I could run the WFS servo (6dofs) for more than 15min by flipping the sign for the MC2 Pit and WFS1 Yaw. (See attachments)
This may mean that the sign of the loops / the input matrix / the output matrix, as well as the sensors and actuators, have the problem. |
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Sat Jun 25 22:18:41 2022, Tomislav, Update, ASC, Simulation and reality comparisons
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In the attachment please find plots comparing controller output, local damping output, and error signals.
Input noises of the simulation are seismic noise, osem noise, input power fluctuations, sensing noises of WFSs and QPD, and air turbulence noise
for WFSs. There is also optical torque noise (radiation pressure effect). |
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Mon Jun 27 12:32:45 2022, yuta, Update, IOO, WFS issues fixed
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p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 13.0px
'Helvetica Neue'}
p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 13.0px 'Helvetica Neue'; min-height: 15.0px}
span.s1 {text-decoration: underline ; color: |
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Mon Jun 27 13:25:50 2022, Cici, Update, General, Characterizing the Transfer Loop
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[Deeksha, Cici]
We first took data of a simple low pass filter, and attempted to perform a fit to both the magnitude and phase in order to find the Z of the
components. Once we felt confident in our ability to measure tranfer functions, we took data and plotted the transfer function of the existing control |
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Mon Jun 27 13:39:40 2022, Deeksha, Update, Electronics, Setting up the MokuLab
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[Cici, Deeksha]
On Friday Cici and I set up the Mokulab to take readings of our loop. The aim is to characterise the PZT, in a similar manner as before, by exciting
the circuit using our input noise (a swept sine) and recording the corresponding changes in the output. We used the MokuLab to observe the beat note |
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Mon Jun 27 18:54:27 2022, yuta, Update, LSC, Modulation depths measurement using Yarm cavity scan
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[Yehonathan, Yuta]
EDITED by YM on 22:11 June 27, 2022 to correct for a factor of two in the modulation index
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Tue Jun 28 09:03:58 2022, JC, Update, General, Organizing and Cleaning
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The plan for the tools in 40m
As of right now, there are 4 tool boxes. X-end, Y-end, Vertex, and the main tool box along the X-arm. The plan is the give each toolbox a set
of their own tools. The tools of X-end, Y-end, and Vertex toolboxes will be very similar containing the basic tools such as pliers, screwdrivers, allen |
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Tue Jun 28 14:24:23 2022, yuta, Update, BHD, BHD DC PD signals now also sent to c1lsc to circumvent IPC error
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[JC, Yuta]
To circumvent IPC error sending BHD DC PD signals from c1sus2 to c1lsc, DB9 cable from BHD DC PD box sent to c1sus2 is now split and sent also
to c1lsc. |
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Tue Jun 28 17:07:47 2022, Anchal, Update, Calibration, Added Beatnote channels in demodulation of c1cal
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I added today demodulation of C1:LSC-BEATX/Y_FINE_I/Q in the c1cal demodulation where different degrees of freedom can be dithered. For McCal (formerly
soCal), we'll dither the arm cavity for which we can use any of the DOFs (like DARM) to send the dither to ETMX/ETMY. Then with green laser locked
as well, we'll get the calibration signal from the beatnotes in the demodulaed channels. We can also read right after the mixing in c1cal model and |
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Tue Jun 28 18:19:09 2022, Tomislav, Update, Electronics, Electronics noise
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I measured electronics noise of WFSs and QPD (of the WFS/QPD, whitening, ADC...) by closing PSL and measuring the error signal. It was needed to put
the offset in C1:IOO-MC_TRANS_SUMFILT_OFFSET to 14000 cts (without offset the sum of quadrants would give zero, and 14000 cts is the value when the cavity
is locked). For WFS that are RF, if there is intensity noise at low frequencies, it is not affecting the measurement. |