 Mon Jun 6 16:09:23 2022, rana, Configuration, DetChar, Summary Pages: seis BLRMS
|
I updated the config file c1pem.ini in /users/public_html/detcharsummary/ConfigFiles, and commited it so I hope it works, but I did not have git push
permissions. Does anyone know what is the idea here? Should we do our own personal git clone and modify that way or shoudl we do it with the control account.
Wiki needs to clear out all the outdated information on this workflow. |
Mon Jun 6 21:01:22 2022, yuta, Update, IMC, MC1 OSEM sensor sign flipped, MC1/2/3 free swinging overnight for inmat diagonalization 
|
[Tomislav Andric, Rana, Yuta]
We put -1 to MC1 OSEM sensor gains and re-tuned MC1 damping.
We also kicked MC1, MC2, MC3 tonight for input matrix diagonalization. |
 Mon Jun 6 22:08:55 2022, Koji, Update, IMC, MC1 OSEM sensor sign flipped, MC1/2/3 free swinging overnight for inmat diagonalization
|
Note that MC1 has a new style sat amp because the old one collapsed. The sign flip might have been the result of the replacement
|
|
Tue Jun 7 18:32:46 2022, Deeksha, Update, Electronics, Noise Budgeting ADC (of redpitaya)
|
Made plots on i/p noise of redpitaya . Need to reconsider sampling frequency (to improve plot at lower freq)
|
|
Wed Jun 8 16:03:12 2022, Koji, Update, VAC, Power Outage 220608: Vacuum Recovery
|
=== Observation ===
TP1/2/3 failed. AUX RP did not survive the power outage (of course)
=== Initial Recovery of TP2/TP3 ===
Stopped TP1/2/3
Restored RP AUX at the wall breaker module
Restarted TP2/3
=== Rough |
|
Wed Jun 8 16:33:26 2022, Koji, Update, General, Power Outage 220608: HVAC restored
|
| I found the HVACs for the ends were off. They were turned back on. |
|
Wed Jun 8 16:57:46 2022, Koji, Update, IOO, Power Outage 220608: IMC restored
|
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. |
|
Fri Jun 10 13:52:22 2022, JC, Update, OPLEV Tables, ITMX, ITMY, and Vertex Table Beam Paths
|
I have at taken photos and added arrows which signify the beam paths for ITMX, ITMY, and Vertex
Oplev tables. |
|
Tue Jun 14 08:41:36 2022, JC, Update, OPLEV Tables, BS Oplev Table Sketch
|
[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. |
|
Fri Jun 10 20:11:46 2022, yuta, Update, ASC, Yarm ASS re-tuning in progress
|
[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. |
|
Mon Jun 13 20:26:09 2022, yuta, Update, ASC, Yarm ASS re-tuning in progress -part 2-
|
[Anchal, Yuta]
We are still in the progress of re-commissioning Yarm ASS. |
|
Tue Jun 14 20:57:15 2022, Anchal, Update, ASC, Yarm ASS working now
|
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 |
|
Tue May 24 11:04:53 2022, JC, Update, VAC, Beginning Pumpdown
|
[JC, Jordan, Paco, Chub]
We began with the pumpdown this morning. We started with the annulus volume and proceeded by using the following:
1. Isolate the RGA Volume by closing of valves VM3 and V7. |
|
Wed May 25 16:38:27 2022, yuta, Update, SUS, Suspensions quick health check
|
[JC, Yuta]
We did a quick health check of suspesions after the pump down.
Summary: |
|
Tue Jun 7 17:26:21 2022, yuta, Update, SUS, ITMY ULCOIL mystery not solved
|
[Paco, Yuta]
We investigated the ITMY ULCOIL issue (40m/16873).
ULSEN is sensing the optic motion but ULCOIL cannot move the optic. |
|
Tue Jun 7 19:13:12 2022, yuta, Update, SUS, Agreement on suspension damping loop polarity conventions
|
Anchal, Paco and I agreed to follow the polarity conventions below for suspension damping loops.
Some of the polarity/gains were changed to homogenize all the suspensions to the convention.
All the suspensions are homogenized except for MC1 (which have all - in sensor |
|
Fri Jun 10 15:02:04 2022, yuta, Update, SUS, Servo gain sign flipped for MC1 WFS relief
|
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.
|
|
Tue Jun 7 19:40:45 2022, Anchal, Update, SUS, ITMY changed output matrix to disable use of UL coil
|
Since UL coil actuation is lost, we modified the output matrix of ITMY to use only UR, LR and LL face coils for POS, PIT and YAW actuation. The output
matrix was changed to following:
POS
PIT
YAW
SIDE
UL
|
|
Wed Jun 8 18:16:20 2022, yuta, Update, SUS, ITMY ULCOIL mystery: Coil driver swap test
|
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, |
|
Thu Jun 9 23:08:39 2022, rana, Update, SUS, ITMY ULCOIL mystery: Coil driver swap test
|
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.
|
|
Fri Jun 10 13:02:14 2022, yuta, Update, SUS, ITMY ULCOIL mystery: Coil driver swap test
|
ITMY ULCOIL was measured to have ~3.3 mH as measured from the flange. RTFE 40m/16896 .
|
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Fri Jun 10 15:04:23 2022, rana, Update, SUS, ITMY ULCOIL mystery: Coil driver swap test
|
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. |
|
Fri Jun 10 21:10:01 2022, yuta, Update, SUS, ITMY ULCOIL mystery: Coil driver swap test
|
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. |
|
Wed Jun 15 17:03:17 2022, yuta, Update, SUS, ITMY ULCOIL issue solved, loose connection in sat amp box
|
[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. |
|
Wed Jun 15 15:45:37 2022, yuta, Update, SUS, LO1 LLCOIL now working, it was loose connection
|
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! |
|
Wed Jun 15 07:26:35 2022, JC, Update, VAC, Beginning Pumpdown
|
[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). |
|
Wed Jun 15 17:12:39 2022, Cici, Summary, General, Preparation for AUX Loop Characterization
|
[Deeksha, Cici]
We went to the end Xarm station and looked at the green laser setup and electronics. We fiddled with the SR-785 and experimented with low-pass
filters, and will be exploring the Python script tomorrow. |
|
Thu Jun 16 19:49:48 2022, Cici, Update, General, Using the SR785
|
[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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Thu Apr 7 11:47:22 2022, Yehonathan, Update, BHD, Initial BHD modeling: AS - LO mode matching
|
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: |
|
Thu Apr 7 21:15:04 2022, Yehonathan, Update, BHD, Initial BHD modeling: AS - LO mode matching
|
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). |
|
Mon May 16 16:13:01 2022, Yehonathan, Update, BHD, Initial BHD modeling: Damped suspension model
|
I was finally able to set up a stable suspension model with the help of Yuta and I'm now ready to start doing some MICH noise budgeting with
BHD readout. (Tip: turns out that in the zpk function in Matlab you should multiply the poles and zeros by -2*pi to match the zpk TFs in Foton)
I copied all the filters from the suspension MEDM screens into a Matlab. Those filters were concatenated with a single pendulum suspension TF |
|
Thu Jun 16 17:40:15 2022, Yehonathan, Update, BHD, Comparison of MICH OLTF model with measurement
|
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). |
|
Fri Jun 17 12:05:32 2022, Yehonathan, Update, BHD, Comparison of MICH OLTF model with measurement
|
I should write down what I didn't include for completeness:
1. AA filters
2. AS55 input 60Hz comb filter |
|
Fri Jun 17 13:07:08 2022, Koji, Update, BHD, Comparison of MICH OLTF model with measurement
|
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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Mon Jun 20 19:46:04 2022, Tomislav, Update, ASC, Simulation plots
|
| 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. |
|
Tue Jun 14 18:45:43 2022, Anchal, Update, SUS, LO2 lower magnets are stuck in coil, won't come off
|
[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 |
|
Tue Jun 14 19:34:06 2022, yuta, Update, SUS, Resonant frequency identification from the free swing test 7x
|
[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. |
|
Thu Jun 16 18:30:07 2022, Anchal, Update, SUS, New diagonalized input matrices applied
|
I used the same fre swing data to diagnolize input matrices of following optics:
MC1, MC2, MC3
BS ETMX ETMY |
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Tue Jun 21 08:36:50 2022, Anchal, Update, SUS, Diagonalized input matrices for LO1, freeSwing on ITMY and ITMX
|
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 |
|
Wed Jun 15 15:07:07 2022, Koji, Update, SUS, LO2 SUS stuck fixed
|
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. |
|
Tue Jun 21 14:59:22 2022, Cici, Summary, General, AUX Transfer Function Loop Exploration
|
[Deeksha, Cici]
We learned about the auxillary laser control loop, and then went into the lab to identify the components and cables represented by our transfer
functions. We connected to the SR785 inside the lab so that we can use it to insert noise next time, and measure the output in various parts of the control |
|
Tue Jun 21 18:41:46 2022, Tomislav, Update, ASC, Simulation plot
|
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 22:22:37 2022, Tomislav, Update, ASC, Plots
|
| 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 17:04:06 2022, Deeksha, Summary, Electronics, Characterising the AUX control loop
|
[Cici, Deekha]
Setup loop to measure transfer function of control loop - the aim is to find the open loop gain of the system using the SR785 to inject
noise (a swept sine) into the system and taking observations using the scope. We tried to calculate the gain algaebraically, in order to understand what |
|
Wed Jun 22 18:55:31 2022, yuta, Update, LSC, Daily alignment work; POY trouble solved
|
[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
|
| 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
|
| 22:05:02 UTC Jordan refilled his water bottle at the water dispenser in the control room. |
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Tue May 4 19:14:43 2021, Yehonathan, Update, General, OSEMs from KAGRA
|
| I put the box containing the untested OSEMs from KAGRA near the south flow bench on the floor. |
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Fri Jun 24 13:29:37 2022, Yehonathan, Update, General, OSEMs from KAGRA
|
The box was given to Juan Gamez (SURF)
Quote:
I put the box containing |
|
Fri Jun 24 17:16:59 2022, Paco, Update, ALS, XAUX cable in control room
|
[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 22:18:41 2022, Tomislav, Update, ASC, Simulation and reality comparisons
|
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). |
|
Fri Jun 24 12:13:16 2022, JC, Update, IOO, WFS issues
|
[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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Sat Jun 25 14:29:48 2022, Anchal, Update, IOO, WFS issues
|
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
|
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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Mon Jun 27 12:32:45 2022, yuta, Update, IOO, WFS issues fixed
|
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
|
[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
|
[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 |
|
Mon Jun 27 18:54:27 2022, yuta, Update, LSC, Modulation depths measurement using Yarm cavity scan
|
[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
|
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 16:26:58 2022, Cici, Summary, General, Vector fitting open loop transfer function/Audio cancellation of optical table enclosure
|
[Deeksha, Cici]
We attempted to use vectfit to fit our earlier transfer function data, and were generally unsuccessful (see vectfit_firstattempt.png), but are
much closer to understanding vectfit than before. Couple of problems to address - finding the right set of initial poles to start with has been very hard, |
|
Tue Jun 28 17:07:47 2022, Anchal, Update, Calibration, Added Beatnote channels in demodulation of c1cal
|
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 22:27:11 2022, Yehonathan, Update, BHD, Measurement of input and output electronics noise
|
{Yuta, Yehonathan}
For MICH noise budgeting we measure the input electronics noise which includes the AS55 RFPD, preamp, demod board, the whitening, and the AA
filters, and the ADC noises. To do so we simply close the laser shutter and take the spectrum of C1:LSC-AS55_I_ERR_DQ and C1:LSC-AS55_Q_ERR_DQ shown in |
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Tue Jun 28 23:10:34 2022, Yehonathan, Update, BHD, Measurement of AS55 demod board conversion factor
|
{Yuta, Yehonathan}
We measured the AS55 demod board conversion from the amplitude of a 55MHz signal to a demodulated signal. We hooked the unused REFL55 LO into
the PD input port on the AS55 demod board. |
|
Tue Jun 28 16:59:35 2022, Paco, Summary, ALS, ALS beat allan deviation (XARM)
|
[Paco]
I took ~ 7 minutes of XALS beatnote data with the XAUX laser locked to the XARM cavity, and the XARM locked to PSL to develop an allan deviation
estimator. The resulting timeseries for the channel C1:ALS-BEATX_FINE_PHASE_OUT_HZ_DQ (decimated |
|
Tue Jun 28 18:53:16 2022, rana, Summary, ALS, ALS beat allan deviation (XARM)
|
what's the reasoning behind using df/f_beat instead of df/f_laser ?
Quote:
[Paco] |
|
Wed Jun 29 14:28:06 2022, Paco, Summary, ALS, ALS beat allan deviation (XARM)
|
I guess it didn't make sense since f_beat can be arbitrarily moved, but the beat is taken around the PSL freq ~ 281.73 THz. Attachment #1
shows the overlapping tau allan deviation for the exact same dataset but using the python package allantools,
where this time I used the PSL freq as the base frequency. This time, I can see the minimum fractional deviation of 1.33e-13 happening |
|
Tue Jun 28 18:19:09 2022, Tomislav, Update, Electronics, Electronics noise
|
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. |
|
Wed Jun 29 18:53:38 2022, rana, Update, Electronics, Electronics noise
|
this is just the CDS error signal, but is not the electronics noise. You have to go into the lab and measure the noise at several points. It can't
be done from the control room. You must measure before and afte the whitening.
|
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Thu Jun 30 17:19:55 2022, Deeksha, Summary, Electronics, Measured Transfer Functions of the Control Loop, Servo (OLTF); got Vectfit working
|
[Cici, Deeksha]
We were able to greatly improve the quality of our readings by changing the parameters in the config file (particularly increasing the integration
and settle cycles, as well as gradually increasing our excitation signals' amplitude). Attached are the readings taken from the same (the files directly |
|
Thu Jun 30 18:06:22 2022, Paco, Update, ALS, Optimum ALS recovery - part I
|
[Paco]
In the morning I took some time to align the AUX beams in the XEND table. Later in the afternoon, I did the same on the YEND table. I then locked
the AUX beams to the arm cavities while they were stabilized using POX/POY and turned off the PSL hepa off temporarily (this |
|
Thu Jun 30 19:04:55 2022, rana, Summary, PSL, PSL HEPA: How what when why
|
For the PSL HEPA, we wanted it to remain at full speed during the vent, when anyone is working on the PSL, or when there is a lot of dust due to outside
conditions or cleaning in the lab.
For NORMAL conditions, the policy is to turn it to 30% for some flow, but low noise. |
|
Thu Jun 30 19:24:24 2022, rana, Summary, PEM, effect of nearby CES construction
|
For the proposed construction in the NW corner of the CES building (near the 40m BS chamber), they did a simulated construction activity on Wednesday
from 12-1.
In the attached image, you can see the effect as seen in our seismometers: |
|
Fri Jul 1 12:49:52 2022, Koji, Update, IOO, MC2 seemed misaligned / fixed
|
I found the IMC was largely misaligned and was not locking. The WFS feedback signals were saturated and MC2 was still largely misaligned in yaw after
resetting the saturation.
It seemed that the MC WFS started to put the large offset at 6:30AM~7:00AM (local). |
|
Tue Jul 5 20:05:06 2022, Tomislav, Update, Electronics, Whitening electronics noise
|
| For whitening electronics noise for WFS1, I get (attachment). This doesn't seem right, right? |
|
Wed Jul 6 15:28:18 2022, Tega, Update, SUS, Output matrix diagonalisation : F2P coil balancing
|
git repo : https://git.ligo.org/40m/scripts/-/tree/main/SUS/OutMatCalc
local dir:
p.p1 {margin: 0.0px 0.0px |
|
Wed Jul 6 18:51:20 2022, Deeksha, Update, Electronics, Measuring the Transfer Function of the PZT
|
Yesterday, we set up the loop to measure the PZT of the transfer function - the MokuLab sends an excitation (note - a swept sine of 1.0 V) to the PZT.
The cavity is locked to the PSL and the AUX is locked to the cavity. In order to measure the effect of our excitation, we take the beat note of the PSL
and the AUX. This gives us a transfer function as seen in Attachment 1. The sampling rate of the MokuLab is set to 'ultrafast' (125kHz), so we |
|
Wed Jul 6 19:58:16 2022, Paco, Summary, NoiseBudget, XARM noise budget
|
[Anchal, Paco, Rana]
We locked the XARM using POX11 and
made a noise budget for the single arm displacement; see Attachment #1. The noise budget is rough in that we use simple calibrations to |
|
Wed Sep 29 17:10:09 2021, Anchal, Summary, CDS, c1teststand problems summary
|
[anchal, ian]
We went and collected some information for the overlords to fix the c1teststand DAQ network issue.
from c1teststand, c1bhd and c1sus2 computers were not accessible through ssh. (No route to host). So we restarted both the computers |
|
Thu Sep 30 14:09:37 2021, Anchal, Summary, CDS, New way to ssh into c1teststand
|
Late elog, original time Wed Sep 29 14:09:59 2021
We opened a new port (22220) in the router to the martian subnetwork which is forwarded to port 22 on c1teststand (192.168.113.245) allowing
direct ssh access to c1teststand computer from the outside world using: |
|
Thu Mar 3 15:37:40 2022, Anchal, Summary, CDS, c1teststand restructured
|
c1teststand has been restructured. There is no port computer called 'c1teststand' anymore. When you ssh into the c1teststand network using ssh
c1teststand from inside martian or from outside network using the method mentioned in this wiki
page , you would land into chiara (clone) computer and you can navigate into any teststand network computer from there. |
|
Mon Oct 4 11:05:44 2021, Anchal, Summary, CDS, c1teststand problems summary
|
[Anchal, Paco]
We tried to fix the ntp synchronization in c1teststand today by repeating the steps listed in 40m/16302.
Even though teh cloned fb1 now has the exact same package version, conf & service files, and status, the FE machines (c1bhd and c1sus2) fail to sync |
|
Mon Oct 4 18:00:16 2021, Koji, Summary, CDS, c1teststand problems summary
|
I don't know anything about mx/open-mx, but you also need open-mx,don't you?
controls@c1ioo:~ 0$ systemctl status *mx*
● open-mx.service - LSB: starts Open-MX driver |
|
Tue Oct 5 17:58:52 2021, Anchal, Summary, CDS, c1teststand problems summary
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open-mx service is running successfully on the fb1(clone), c1bhd and c1sus.
Quote:
I don't know |
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Tue Oct 5 18:00:53 2021, Anchal, Summary, CDS, c1teststand time synchronization working now
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Today I got a new router that I used to connect the c1teststand, fb1 and chiara. I was able to see internet access in c1teststand and fb1, but not in
chiara. I'm not sure why that is the case.
The good news is that the ntp server on fb1(clone) is working fine now and both FE computers, c1bhd and c1sus2 are succesfully synchronized to |
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Mon Oct 11 17:31:25 2021, Anchal, Summary, CDS, Fixed mounting of mx devices in fb. daqd_dc is running now.
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Mon Oct 11 18:29:35 2021, Anchal, Summary, CDS, Moving forward?
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The teststand has some non-trivial issue with Myrinet card (either software or hardware) which even teh experts are saying they don't remember how
to fix it. CDS with mx was iin use more than a decade ago, so it is hard to find support for issues with it now and will be the same in future. We need
to wrap up this test procedure one way or another now, so I have following two options moving forward: |
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Tue Oct 12 17:20:12 2021, Anchal, Summary, CDS, Connected c1sus2 to martian network
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I connected c1sus2 to the martian network by splitting the c1sim connection with a 5-way switch. I also ran another ethernet cable from the second port
of c1sus2 to the DAQ network switch on 1X7.
Then I logged into chiara and added the following in chiara:/etc/dhcp/dhcpd.conf : |
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Tue Oct 12 23:42:56 2021, Koji, Summary, CDS, Connected c1sus2 to martian network
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Don't you need to add the new hosts to /diskless/root/etc/rtsystab at fb1? --> There looks many elogs talking about editing "rtsystab".
controls@fb1:/diskless/root/etc 0$ cat rtsystab
# |
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Wed Oct 13 11:25:14 2021, Anchal, Summary, CDS, Ran c1sus2 models in martian CDS. All good!
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Three extra steps (when adding new models, new FE):
Chris pointed out that the sudo command in c1sus2 is giving
error
sudo: unable to resolve host c1sus2
This
error comes in when the computer could not figure out it's own hostname. Since FEs are network booted off the fb1, we need to update the /etc/hosts |
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Tue Oct 19 18:20:33 2021, Ian MacMillan, Summary, CDS, c1sus2 DAC to ADC test
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I ran a DAC to ADC test on c1sus2 channels where I hooked up the outputs on the DAC to the input channels on the ADC. We used different combinations
of ADCs and DACs to make sure that there were no errors that cancel each other out in the end. I took a transfer function across these channel combinations
to reproduce figure 1 in T2000188. |
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Tue Oct 19 23:43:09 2021, Koji, Summary, CDS, c1sus2 DAC to ADC test
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(Because of a totally unrelated reason) I was checking the electronics units for the upgrade. And I realized that the electronics units at the
test stand have not been properly powered.
I found that the AA/AI stack at the test stand (Attachment 1) has an unusual powering configuration (Attachment 2). |
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Wed Oct 20 11:48:27 2021, Anchal, Summary, CDS, Power supple configured correctly.
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This was horrible! That's my bad, I should have checked the configuration before assuming that it is right.
I fixed the power supply configuration. Now the strip has two rails of +/- 18V and the GND is referenced to power supply earth GND.
Ian should redo the tests. |
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Tue Oct 26 18:24:00 2021, Ian MacMillan, Summary, CDS, c1sus2 DAC to ADC test
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[Ian, Anchal, Paco]
After the Koji found that there was a problem with the power source Anchal and I
fixed the power then reran the measurment. The only change this time around is that I increased the excitation amplitude to 100. In the first run the excitation |
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Wed Dec 22 17:40:22 2021, Anchal, Summary, CDS, c1su2 model updated with SUS damping blocks for 7 SOSs
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[Anchal, Koji]
I've updated the c1su2 model today with model suspension blocks for the 7 new SOSs (LO1, LO2, AS1, AS4, SR2, PR2 and PR3). The model is running
properly now but we had some difficulty in getting it to run. |
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Wed Dec 29 20:09:40 2021, rana, Summary, CDS, c1su2 model updated with SUS damping blocks for 7 SOSs
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We want to maintain the 16 kHz sample rate for the COIL DAQ channels, but nothing wrong with reducing the others.
I would suggest setting the DQ sample rates to 256 Hz for the SUS DAMP channels and 1024 Hz for the OPLEV channels (for noise diagnostics).
Maybe you can put these numbers into a new library part and we can have the best of all worlds? |
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Fri Mar 4 11:04:34 2022, Anchal, Summary, CDS, c1susaux2 system setup and running
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I took the c1teststand computer from teststand and converted it into c1susaux2. To do so, I installed a fresh copy of debian 10 on it and followed the
steps on this wiki page. I did some parts slightly differently though. The directory /cvs/cds/caltecg/c1susaux2
is a repository and contains the service unit file modbusIOC.service |
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Mon Mar 7 19:38:47 2022, Anchal, Summary, CDS, c1susaux2 slow controls issues
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I tried to perform a simple enabling test of coils using c1susaux2 modbus channels but failed. I'm able to do the enabling of coils using the windows
GUI of acromag card but I can not do it when the cards are connected to the computer subnetwork. The issue is two-fold:
The enable channels such as C1:SUS-LO1_UL_ENABLE are not changing values when their DOL changes a value. In this case, I created a calc |
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Mon Mar 14 12:20:05 2022, Anchal, Summary, CDS, c1susaux2 slow controls acromag chassis installed
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[Anchal, Yehonathan, Ian]
We installed c1susaux2 acromag chassis in 1Y0 with c1susaux2 computer. We connected PD monitors, Binary inputs, Binary outputs, and Run/Acquire
RTS signals for 6 of the 7 suspensions. We ran out of DB9 cables to connect PR3. Of the ones that were connected, LO2, AS1, AS4, SR2, and PR2 are showing |
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Thu Mar 17 19:12:44 2022, Anchal, Summary, CDS, c1auxey1 slow controls acromag chassis installed, not powered
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[Anchal, Tega]
We installed c1auxey1 computer and the acromag chassis in 1Y4. The computer has been configured properly for nfs mounts to happen and we have
initialized a git repo for /cvs/cds/caltech/target/c1auxey1 directory which stores all files for running modbusIOC service on this computer. We connected |
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Fri Mar 18 18:39:13 2022, Yehonathan, Summary, CDS, c1auxey1 slow controls acromag chassis installed, powered
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{Yehonathan, Anchal}
We connected the c1auxey1 chassie to the different boxes (coil drivers, SAT amp, etc.) using DB9 cables and labeling them in the process. We
ran out of 2.5 foot DB9 cables so we used 5 foot as a temporary solution. |
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Fri Mar 18 19:10:51 2022, Anchal, Summary, CDS, c1auxey1 slow controls issues
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I started the modbusIOC service on c1auxey1 and added PD variance channels for UR and SD as well. There are unfortunately two issues here:
The enable monitors are reading NOT of what they should read. The optical isolator circuit might need to be changed.
ETMY
is not damping now. This is strange and was seen in the use to other acromag chassis as well where AS4 and PR2 are unable to damp. This is weird |
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Mon Mar 21 18:42:06 2022, Anchal, Summary, CDS, c1auxey1 slow controls issues
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| Another issue, Green Y Shutter can not be controlled with the EPICS controls right now. This needs to be investigated. |
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Mon Apr 4 17:03:47 2022, Anchal, Summary, CDS, c1susaux2 slow controls acromag chassis fixed and installed
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[Anchal, JC, Ian, Paco]
We have now fixed all issues with the PD mons of c1susaux2 chassis. The slow channels are now reading same values as the fast channels and there
is no arbitrary offset. The binary channels are all working now except for LO2 UL which keeps showing ENABLE OFF. This was an issue earlier on LO1 UR and |
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Wed Jul 6 22:40:03 2022, Tega, Summary, CDS, Use osem variance to turn off SUS damping instead of coil outputs
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I updated the database files for the 7 BHD optics
to separate the OSEM variance trigger and the LATCH_OFF trigger operations so that an OSEM variance value exceeding the max of say 200 cnts turns
off the damping loop whereas pressing the LATCH_OFF button cuts power to the coil. I restarted the modbusIOC service on c1susaux2 and checked that the |
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Thu Jul 7 21:25:48 2022, Tega, Summary, CDS, Use osem variance to turn off SUS damping instead of coil outputs
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[Anchal, Tega]
Implemented ramp down of coil bias voltage
when the BHD optics watchdog is tripped. Also added a watchdog reset button to the SUS medm screen that turns on damping and ramps up the coil PIT/YAW |
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Tue Mar 15 11:52:34 2022, Anchal, Summary, CDS, c1su2 model updated for sending Run/Acquire Binary Output to Binary Interface card
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I routed the XXX_COIL_DW signals from the 7 SOS blocks in c1su2.mdl (located at /cvs/cds/rtcds/userapps/trunk/sus/c1/models/c1su2.mdl) to the binary
outputs from the FE model. The routing is done such that when these binary outputs are routed through the binary interface card mounted on 1Y0, they go
to the acromag chassis just installed and from there they go to the binary inputs of the coil drivers together with the acromag controlled coil outputs. |
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Tue Mar 15 14:10:41 2022, Anchal, Summary, CDS, c1su2 model remade, reinstalled, restarted after the update
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I have restarted c1su2 model with the connections of Run Acquire switch to analog filters on coil drivers. Following steps were taken:
First ssh to c1sus2 and then:
controls@c1sus2:~ |
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Tue Oct 12 17:10:56 2021, Anchal, Summary, CDS, Some more information
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Chris pointed out some information displaying scripts, that show if the DAQ network is working or not. I thought it would be nice to log this information
here as well.
controls@fb1:/opt/mx/bin 0$ ./mx_info
MX |
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Fri Jul 8 14:03:33 2022, JC, HowTo, VAC, Vacuum Preparation for Power Shutdown
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[Koji, JC]
Koji and I have prepared the vacuum system for the power outage on Saturday.
Closed V1 to isolate the main volume.
Closed of VASE, VASV, VABSSCI,VABS, VABSSCO, VAEV, and VAEE.
Closed V6, then |
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Fri Jul 8 23:10:04 2022, Koji, Summary, General, July 9th, 2022 Power Outage Prep
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The 40m team worked on the power outage preparation. The detailed is summarized on this wiki page. We will still be able to access the wiki page during
the power outage as it is hosted some where in Downs.
https://wiki-40m.ligo.caltech.edu/Complete_power_shutdown_2022_07 |
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Mon Jul 11 11:16:45 2022, JC, Summary, Electronics, Startup after Shutdown
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[Paco, Yehonathan, JC]
We began starting up all the electronics this morning beginning in the Y-end. After following the steps on the Complete_Power_Shutdown_Procedures
on the 40m wiki, we only came across 2 issues. |
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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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Thu Apr 21 16:36:56 2022, Tega, Update, VAC, cleanup work for vacuum git repo
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git repo - https://git.ligo.org/40m/vac
Finally incorporated the FRGs into the main modbusIOC service and everything seems to be working fine. I have also removed the old sensors (CC1,CC2,CC3,CC4,PTP1,IG1)
from the serial client list and their corresponding EPICS channels. Furthermore, the interlock service python script has been updated so that all occurrence |
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Tue May 24 10:37:09 2022, Tega, Update, VAC, added FRG channels to slow channel ini file
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[Vacuum gauge sensors]
Paco informed me that the FRG sensor EPICS channels are not available on dataviewer, so I added them to slow channels ini file (/opt/rtcds/caltech/c1/chans/daq/C0EDCU.ini).
I also commented out the old CC1, CC2, CC3 and CC4 gauges. A service restart is required for them to become available but this cannot be done right now |
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Mon Jul 11 17:25:43 2022, Tega, Update, VAC, fixed obsolete reference bug in serial_XGS600 service
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Koji noticed that the FRG sensors were not updating due to reference to an obsolete modbusIOC_XGS service, which was used temporarily to test
the operation of the serial XGS sensor readout to EPICS. The information in this service was later moved into modbusIOC.service but the dependence on the
modbusIOC_XGS.service was not removed from the serial_XGS600.service. This did not present any issue before the shutdown, probably bcos the obsolete service |
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Mon Jul 11 15:26:12 2022, JC, HowTo, VAC, Startup after Power Outage
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[Koji, Jc]
Koji and I began starting that Vacuum system up.
Reverse order step 2 of shutting down electronics. Anthing after, turn |
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Mon Jul 11 17:41:52 2022, Koji, HowTo, VAC, Startup after Power Outage
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- Once the FRG gauge readings are back (see next elog by Tega), I could open V1 to pump down the main vacuum manifold.
- TP2/TP3 were brought back to stand-by mode (slower spinning)
- V7 was closed to separate the annuli side and TP1 |
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Mon Jul 11 19:29:23 2022, Paco, Summary, General, Finalizing recovery -- timing issues, cds, MC1
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[Yuta, Koji, Paco]
Restarting CDS
We were having some trouble restarting all the models on the
FEs. The error was the famous 0x4000 DC error, which has to do with time de-synchronization |