The last entry I found relating to ref cavity was 2011 Aug 19
Tried taking the circuit from the breadboard to the PCB. I attached all the components to adapters that would allow them to be connected to the PCB. From the first picture, the first component is AD586, the second is AD590, and the third is LT1012, along with a resistor across it. I then soldered the connections between the components, as can be seen in the second picture. When I tested out this version of the circuit by hooking it up to the DC source, I got a reading of ~-15V. I will have to check all the connections to make sure there is contact where there should be one, and no contact where there shouldn't be. I had issues attaching the tiny AD590 and LT1012 to its adaptor, so the issue may lie there as well. I'll also check that each component is in working order as well.
Once I figure out where my error is, my plan is to build two more of these and place a metal object such that it contacts only the surface of the AD590s. This would allow me to compare the three values to the actual temperature of the metal, which would then tell me how accurate this setup is.
Note on the resistor: I measured all the resistors and chose three that had exactly 10.00k Ohm. The voltage detected is dependent on the resistor, so if we are to take three identical copies, I ensured that there would be no error due to the resistors being a little different.
The CDS system has now been up moved to a supposedly more stable real-time-patched linux kernel (3.2.88-csp) and RCG r4447 (roughly the head of trunk, intended to be release 3.4). With one major and one minor exception, everything seems to be working:
The remaining issues are:
Issues that have been fixed:
What's the current backup situation?
Good question. We need to figure something out. fb1 root is on a RAID1, so there is one layer of safety. But we absolutely need a full backup of the fb1 root filesystem. I don't have any great suggestions, other than just getting an external disk, 1T or so, and just copying all of root (minus NFS mounts).
We also need to copy chiara's root. What is the best way to get the full image of the root FS?
We may need to restore these root images to a different disk with a different capacity.
Is the dump command good for this?
RFM network is back! Everything green again.
Use of RFM has been turned off in adLigoRTS trunk in favor of the new long-range PCIe networking being developed for the sites. Rolf provided a single-line patch that re-enables it:
controls@c1sus:/opt/rtcds/rtscore/trunk 0$ svn diff
--- src/epics/util/feCodeGen.pl (revision 4447)
+++ src/epics/util/feCodeGen.pl (working copy)
@@ -122,7 +122,7 @@
$diagTest = -1;
$flipSignals = 0;
$virtualiop = 0;
-$rfm_via_pcie = 1;
+$rfm_via_pcie = 0;
$edcu = 0;
$casdf = 0;
$globalsdf = 0;
This patched was applied to RTS source checkout we're using for the FE builds (/opt/rtcds/rtscore/trunk, which is r4447, and is linked to /opt/rtcds/rtscore/release). The following models that use RFM were re-compiled, re-installed, and re-started:
The re-compiled models now see the RFM cards (dmesg log from c1ioo):
[24052.203469] c1x03: Total of 4 I/O modules found and mapped
[24052.203471] c1x03: ***************************************************************************
[24052.203473] c1x03: 1 RFM cards found
[24052.203474] c1x03: RFM 0 is a VMIC_5565 module with Node ID 180
[24052.203476] c1x03: address is 0xffffc90021000000
[24052.203478] c1x03: ***************************************************************************
This cleared up all RFM transmission error messages.
CDS upstream are working to make this RFM usage switchable in a reasonable way.
Now that all the CDS overview lights are green, I decided to switch back the coil driver outputs to their original state so that the MC optics could be damped and the IMC relocked. I also restored the static PIT/YAW bias values to their original values.
MC1 has been quiet over the last couple of days, lets see how it behaves in the next few days. In all the glitches I have observed, if the IMC is locked and WFS loops are enabled, the loops are able to correct for the DC misalignment caused by the glitch. But the mcwfs off script is currently set up in such a way that the output history is cleared between IMC locks. I made two copies of the mcwfson/mcwfsoff scripts, called mcwfsunhold/mcwfshold respectively. They live in /opt/rtcds/caltech/c1/scripts/MC/WFS. I've also modified the autolocker script to call these modified scripts, such that when the IMC loses lock, the WFS servo outputs are held, while the input is turned off. The hope is that in this configuration, the autolocker can catch a lock even if there is a glitch on MC1.
I haven't tried locking the arms yet, but I think other IFO work discussed at the meeting (like arm loss estimation / cavity scans etc) can proceed.
In order to further narrow down the cause of the glitch, we switched the Coil Driver Board --> Satellite box DB(15?) connectors on the coil drivers between MC1 and MC3 coil driver boards. I also changed the static PIT/YAW bias voltages to MC1 and MC3 such that MC-REFL is now approximately back to the center of the CCD monitor.
I'm not sure if this has something to do with the model restarts / new RCG, but while I was re-enabling the MC watchdogs, I noticed the RMS sensor voltage channels on ITMX hovering around ~100mV, even though local damping was on (in which configuration I would expect <1mV if everything is working normally). I was confused by this behaviour, and after staring at the ITMX suspension screen for a while, I noticed that the input to the "ASCP" and "ASCY" servos were "-nan", and the outputs were 10^20 cts (see Attachment #1).
Digging a little deeper, I found that the same problem existed on ITMY, ETMX, ETMY, PRM (but not BS or SRM) - reasons unknown for now.
I have to check where this signal is coming from, but for now I just turned the "ASC Input" switch off. More investigation to be done, but in the meantime, ASS dither alignment may not be possible.
After consulting with Jamie, I have just disabled all outputs to the suspensions other than local damping loop outputs. I need to figure out how to get this configuration into the safe.snap file such that until we are sure of what is going on, the models start up in this safer configuration.
gedit 28 Oct 0026: Seems like this problem is seen at the sites as well. I wonder if the problem is related.
Today, with Johannes' help, I cleaned the fiber tips of the photodiodes. The effect of the cleaning was dramatic - see Attachments #1-4, which are X Beat PD, axial illumination, X Beat PD, oblique illumination, Y beat PD, axial illumination, Y beat PD, oblique illumination. They look much cleaner now, and the feature that looked like a scratch has vanished.
The cleaning procedure followed was:
I will repeat this procedure for all fiber connections once I start putting the box back together - I'm almost done with the new box, just waiting on some hardware to arrive.
Today, I borrowed the fiber microscope from Johannes and took a look at the fibers coupled to the PDs. The PD labelled "BEAT PD AUX Y" has an end that seems scratched (Attachments #1 and #2). The scratch seems to be on (or at least very close to) the core. The other PD (Attachments #3 and #4) doesn't look very clean either, but at least the area near the core seems undamaged. The two attachments for each PD corresponds to the two available lighting settings on the fiber microscope.
I have not attempted to clean them yet, though I have also borrowed the cleaning supplies to facilitate this from Johannes. I also plan to inspect the ends of all other fiber connections before re-installing them.
The PSL HEPA was running noisy at 100V The bearing is wearing out. I turned it down to 30V It is quiet there.
Got it to work. One of the connections was faulty. I decided to check the temperature measured against a thermometer. The sensor showed 26.1 C, but the thermometer showed 25.8 C after I let them both cool down after heating them up. The temperature of the thermometer was dropping at the time of measurement, but the temperature of the sensor was not. This is still a rough version of the final sensor, so I'm not sure what exactly causes this discrepancy.
Seems like this modification didn't really work. There were several large MC1 glitches, and one of them misaligned MC1 so much that the IMC didn't relock for the last ~6 hours. I re-aligned MC1 manually, and now it is locked fine.
that's why the Autolocker clears the outputs; we don't want to be holding the offsets from the last ms of lock when it was all messed up; instead it would be best to have a slow (~mHz) relief script that takes the WFS controls and puts them onto the MC SUS sliders. This would then re-align the MC to the input beam rather than the input to the MC. Which is not the best idea.
Seems like this modification didn't really work.
The JetStor RAID unit that we had been using for frame writing before the fb meltdown has some archived frames from DRFPMI locks that I want to get at. I spent some time today trying to mount it on optimus with no success
The unit was connected to fb via a SCSI cable to a SCSI-to-PCI card inside of fb. I moved the card to optimus, and attached the cable. However, no mountable device corresponding to the RAID seems to show up anywhere.
The RAID unit can tell that it's hooked up to a computer, because when optimus restarts, the RAID event log says "Host Channel 0 - SCSI Bus Reset."
The computer is able to get some sort of signals from the RAID unit, because when I change the SCSI ID, the syslog will say 'detected non-optimal RAID status'.
The PCI card is ID'd fine in lspci as "06:01.0 SCSI storage controller: LSI Logic / Symbios Logic 53c1030 PCI-X Fusion-MPT Dual Ultra320 SCSI (rev c1)"
'lsssci' does not list anything related to the unit
Using 'mpt-status -p', which is somehow associated with this kind of thing returns the disheartening output:
Checking for SCSI ID:0
Checking for SCSI ID:1
Checking for SCSI ID:2
Checking for SCSI ID:3
Checking for SCSI ID:4
Checking for SCSI ID:5
Checking for SCSI ID:6
Checking for SCSI ID:7
Checking for SCSI ID:8
Checking for SCSI ID:9
Checking for SCSI ID:10
Checking for SCSI ID:11
Checking for SCSI ID:12
Checking for SCSI ID:13
Checking for SCSI ID:14
Checking for SCSI ID:15
Nothing found, contact the author
I spent some time today trying to debug this issue.
Jamie and I had opened up the c1sus frontend to try and replace the RFM card before we realized that the problem was in the RCG code generator. During this process, we had disconnected all of the back-panel cabling to this machine (2 ethernet cables, dolphin cable, and RFM cables/fibers). I thought I may have accidentally returned the cables to the wrong positions - but all the status indicator lights indicate that everything is working as it should, and I also confirmed that the cabling is as it is in the pictures of the rack on the wiki page.
Looking at the SimuLink model diagram (see Attachment #1 for example), it looks like (at least some of) these channels are actually on the dolphin network, and not the RFM network (with which we were experiencing problems). This suggests that the problem is something deeper. Although I did see nans in some of the ETMX ASC channels as well, for which the channels are piped over the RFM network. Even more puzzling is that the ASC MEDM screen (Attachment #3) and the SimuLink diagram (Attachment #2) suggest that there is an output matrix in between the input signals and the output angular control signals to the suspensions. As Attachment #4 shows, the rows corresponding to ITMX PIT and YAW are zero (I confirmed using z read <matrixElement>). Attachment #3 shows that the output of all the servo banks except CARM_YAW is zero, but CARM_YAW has no matrix element going to the ITMs (also confirmed with z read <servoOutputChannel>). So 0 x 0 should be 0, but for some reason the model doesn't give this output?
z read <matrixElement>
z read <servoOutputChannel>
GV Edit: As EricQ just pointed out to me, nan x 0 is still nan, which probably explains the whole issue. Poking a little further, it seems like this is an SDF issue - the SDF table isn't able to catch differences for this hold output channel.
As I was writing this elog, I noticed that, as mentioned above, the CARM_YAW output was "nan". When I restart the model (thankfully this didn't crash c1lsc!), it seems to default to this state. Opening up the filter module, I saw that the "hold output" was enabled.
All the points above stand - CARM_YAW output shouldn't have been going anywhere as per the output matrix, but it seems to have been responsible? Seems like a bug in any case if a model restarts with a field as "nan".
Anyways the problem seems to have been resolved so I'm going to try locking and dither aligning the arms now.
Rolf mentioned that a simple update could fix several of the CDS issues we are facing (e.g. inability to open up testpoints), but he didn't seem to have any insight into this particular issue. Jamie will try and recompile all the models and then we have to see if that fixes the remaining problems.
Leaving LSC mode OFF for now while CDS is still under investigation
Not really related to this work: We saw that the safe.snap file for c1oaf seems to have gotten overwritten at some point. I restored the EPICS values from a known good time, and over-wrote the safe.snap file.
My motivation tonight was to get an up-to-date spectrum of a calibrated measurement of the out-of-loop displacement of an arm locked on ALS (using the PDH signal as the out-of-loop sensor) to compare the performance of ALS control noise with the Izumi et al green locking paper.
I was able to fish out the PSD from the paper from the 40m svn, but the comparison as plotted looks kind of fishy. I don't see why the noise from 10-60Hz should be so different/worse. We updated the POX counts to meters conversion by looking at the Hz-calibrated ALSX signal and a ~800Hz line injected on ETMX.
They are synchronised tiny glitches. They are not mechanical.
On Friday, I cleaned up the circuit so that there are only three connections needed (+15V, -15V, GND) and a BNC connector for reading the output. Today, I added in bypass capacitors. The small yellow ones are 0.1 microF ceramic, and the large ones are 100 microF electrolytic. They are used to stabilize the +15V and -15V inputs to the OP amp and minimize fluctuations, since it doesn't have a regulator for stability. I have also attached the circuit diagram for the OP amp only, where 1 are the electrolytic and 2 are the ceramic. The temperature is still about 2 degrees off, but if that difference is constant for all temperatures in our range we can just calibrate it later.
Here is a helpful link on bypass capacitors (thanks to Kevin for sending it to me).
As a note, the electrolytic capacitors do have a polarity, so it is important to place them correctly (the negative side is towards the lower voltage potential, and not always towards ground).
In the aftermath of the accidental vent, it looks like the RGA was shutdown.
We followed the instructions in this elog to restart the RGA.
Seems to be working now, Steve says we just need to wait for it to warm up before we can collect a reliable scan.
We have good RGA scan now. There was no scan for 3 months.
At Rolf/Rich Abbott's request, we performed a check of the UPS today.
Steve believed that the UPS was functioning as it should, and the recent accidental vent was because the UPS batteries were insufficiently charged when the test was performed. Today, we decided to try testing the UPS.
We first closed V1, VM1 and VA6 using the MEDM screen. We prepared to pull power on all these valves by loosening the power connections (but not detaching them). [During this process, I lost the screw holding the power cord fixed to the gate valve V1 - we are looking for a replacement right now but it seems to be an odd size. It is cable tied for now.]
The battery charge indicator LEDs on the UPS indicated that the batteries were fully charged.
Next, we hit the "Test" button on the UPS - it has to be held down for ~3 seconds for the test to be actually initiated, seems to be a safety feature of the UPS. Once the test is underway, the LED indicators on the UPS will indicate that the loading is on the UPS batteries. The test itself lasts for ~5seconds, after which the UPS automatically reverts to the nominal configuration of supplying power from the main line (no additional user input is required).
In this test, one of the five battery charge indicator LEDs went off (5 ON LEDs indicate full charge).
So on the basis of this test, it would seem that the UPS is functioning as expected. It remains to be investigated if the various hardware/software interlocks in place will initiate the right sequence of valve closures when required.
Never hit O on the Vacuum UPS !
Note: the " all off " configuration should be all valves closed ! This should be fixed now.
In case of emergency you can close V1 with disconnecting it's actuating power as shown on Atm3 if you have peumatic pressure 60 PSI
I worked a little bit on the Y arm ALS today.
I am now going to measure the OLTFs of both green PDH loops to check that the overall loop gain is okay, and also check the measurement against EricQ's LISO model of the (modified) AUX green PDH servos. Results to follow.
Some weeks ago, I had moved some of the Green steering optics on the PSL table around, in order to flip some mirror mounts and try and get angles of incidence closer to ~45deg on some of the steering mirrors. As a result of this work, I can see some light on the GTRY CCD when the X green shutter is open. It is unclear if there is also some scattered light on the RFPDs. I will post pictures + a more detailed investigation of the situation on the PSL table later, there are multiple stray green beams on the PSL table which should probably be dumped.
As I was writing this elog, I saw the X green lock drop abruptly. During this time, the X arm stayed locked to the IR, and the Y arm beat on the control room network analyzer did not jump (at least not by an amount visible to the eye). Toggling the X end shutter a few times, the green TEM00 lock was re-acquired, but the beatnote has moved on the control room analyzer by ~40MHz. On Friday evening however, the X green lock held for >1 hour. Need to keep an eye on this.
Attachment #1 shows the results of my measurements tonight (SR785 data in Attachment #2). Both loops have a UGF of ~10kHz, with ~55 degrees of phase margin.
Excitation was injected via SR560 at the PDH error point, amplitude was 35mV. According to the LED indicators on these boxes, the low frequency boost stages were ON. Gain knob of the X end PDH box was at 6.5, that of the Y end PDH box was at 4.9. I need to check the schematics to interpret these numbers. GV Edit: According to this elog, these numbers mean that the overall gain of the X end PDH box is approx. 25dB, while that of the Y end PDH box is approx. 15dB. I believe the Y end Lightwave NPRO has an actuator discriminant ~5MHz/V, while the X end Innolight is more like 1MHz/V.
Not sure what to make of the X PDH loop measurement being so much noisier than the Y end, I need to think about this.
More detailed analysis to follow.
It turns out the problem was just a bent pin on the SCSI cable, likely from having to stretch things a bit to reach optimus from the RAID unit.
I hooked it up to megatron, and it was automatically recognized and mounted.
I had to turn off the new FB machine and remove it from the rack to be able to access megatron though, since it was just sitting on top. FB needs a rail to sit on!
At a cursory glance, the filesystem appears intact. I have copied over the achived DRFPMI frame files to my user directory for now, and Gautam is going to look into getting those permanently stored on the LDAS copy of 40m frames, so that we can have some redundancy.
Also, during this time, one of the HDDs in the RAID unit failed its SMART tests, so the RAID unit wanted it replaced. There were some spare drives in a little box directly under the unit, so I've installed one and am currently incorporating it back into the RAID.
There are two more backup drives in the box. We're running a RAID 5 configuration, so we can only lose one drive at a time before data is lost.
I had some trouble getting the daqd processes up and running again using Jamie's instructions.
With Jamie's help however, they are back up and running now. The problem was that the mx infrastructure didn't come back up on its own. So prior to running sudo systemctl restart daqd_*, Jamie ran sudo systemctl start mx. This seems to have done the trick.
c1iscey was still showing red fields on the CDS overview screen so Jamie did a soft reboot. The machine came back up cleanly, so I restarted all the models. But the indicator lights were still red. Apparently the mx processes weren't running on c1iscey. The way to fix this is to run sudo systemctl start mx_stream. Now everything is green.
Now we are going to work on trying the fix Rolf suggested on c1iscex.
Here is what was done (Jamie will correct me if I am mistaken).
So while we are in a better state now, the problem isn't fully solved.
Comment: seems like there is an in-built timeout for testpoints opened with DTT - if the measurement is inactive for some time (unsure how much exactly but something like 5mins), the testpoint is automatically closed.
After getting the go ahead from Jamie, I recompiled all the FE models against the same version of RCG that we tested on the c1iscex models.
To do so:
IFO alignment needs to be redone, but at least we now have a (admittedly rounabout way) of getting testpoints. Did a quick check for "nan-s" on the ASC screen, saw none. So I am re-enabling watchdogs for all optics.
GV 23 August 9am: Last night, I re-aligned the TMs for single arm locks. Before the model restarts, I had saved the good alignment on the EPICs sliders, but the gain of x3 on the coil driver filter banks have to be manually turned on at the moment (i.e. the safe.snap file has them off). ALS noise looked good for both arms, so just for fun, I tried transitioning control of both arms to ALS (in the CARM/DARM basis as we do when we lock DRFPMI, using the Transition_IR_ALS.py script), and was successful.
Didn't someone look at what the OLG req. should be for these servos at some point? I wonder if we can make a parallel digital path that we switch on after green lock. Then we could make this a simple 1/f box and just add in the digital path (take analog control signal into ADC, filter, and then sum into the control point further down the path to the laser) for the low frequency boost.
The V1 gate valve specs installed at 40m wiki page. VAT model number 10846-UE44-0007 Our main volume pumping goes through this 8" id gate valve V1 to Maglev turbo or Cryo pump to VC1
The ion pumps have 6" id gate valves:VAT 10844-UE44-AAY1, Pneumatic actuator with position indicator and double acting solenoid valve 115V 60Hz Purchased 1999 Dec 22
UHV gate valves 2.5" id. VAT 10836-UE44 Pneumatic actuator with position indicator and double acting solenoid valve 115V 60 hz, IFO to RGA VM1 & RGA to Maglev VM2
mini UHV gate valve 1.5" id. VAT 01032-UE01 2016 cataloge page 14, manual - no position indicator, VM4 next to manual adjustable fine leak valve to RGA
UHV angle valve 1.5" id, model VAT 28432-GE41, Viton plate seal, pneumatic actuator with position indicator & solenoid valve 115V & single acting closing spring MEDM screen: VM3,VC2, V3,V4,V5,V6,VA6,V7 & annuloses Each chamber annulos has 2 valves.
UHV angle valve 1.5" id, model VAT 57132-GE05 go page 208, Metal tip seal, manual actuating only with position indicator, MEDM screen: roughing RV1 and venting VV1 hand wheel needed to close to torque spec
UHV angle valve 1.5" id. model VAT 28432-GE01 Viton plate seal, manual operation only at IT gauges Hornet & Super Bee and ion pumps roughing ports. These are not labeled.
The Cryo pump interlock wiring was added too
Note: all moving valve plate seals are single.
I completed the revamp of the box, and re-installed the box on the PSL table today. I think it would be ideal to install this on one of the electronic racks, perhaps 1X2 would be best. We would have to re-route the fibers from the PSL table to 1X2, but I think they have sufficient length, and this way, the whole arrangement is much cleaner.
Did a quick check to make sure I could see beat notes for both arms. I will now attempt to measure the ALS noise with this revamped box, to see if the improved power supply and grounding arrangement, as well as fiber cleaning, has had any effect.
Photos + power budget + plan of action for using this box to characterize the green PDH locking to follow.
For quick reference: here is the AM/PM measurement done when we re-installed the repaired Innolight NPRO on the new X endtable.
Since the single arm locking and dither alignment seemed to work alright after the CDS overhaul, I decided to try some recycling cavity locking tonight.
Why should this have changed? I was just on the AS table and did re-center the beam onto the REFL 55 RFPD, but I had also done this in April/May when I was last doing DRMI locking. But I can't explain the apparent factor of ~4 increase in light level. I think I have some measurements of the light levels at various PDs from April 2017, I will see how the present levels line up.
Of course dataviever won't cooperate when I am trying to monitor testpoints.
I may be missing something obvious, but I am quitting for tonight, will look into this more tomorrow.
Unrelated to this work: looking at the GTRY spot on the CCD monitor, there seems to be some excess angular motion. Not sure where this is coming from. In the past, this sort of problem has been symptomatic of something going wonky with the Oplev loops. But I took loop measurements for ITMY and ETMY PIT and YAW, they look normal. I will investigate further when I am doing some more ALS work.
A couple of weeks ago, I was trying to modernize the python version of the FSS Slow temperature control loops, when I accidentally ended up deleting it . There was no svn backup. So the old Perl PID script has been running for the last few days.
Today, I checked out the latest version that Andrew and co. have running in the PSL lab. I had to make some important modifications for the script to work for the 40m setup.
python FSSSlow.py -i FSSSlowPy.ini
Then I stopped the Perl process on megatron by running
sudo initctl stop FSSslow
and started the Python process by running
sudo initctl start FSSslowPy
I have now committed the files FSSSlow.py and FSSSlowPy.ini to the 40m svn. Things seem to be stable for the last 20 mins or so, let's keep an eye on this though - although we had been running the Python PID loop for some months, this version is a slightly modified one.
The initctl stuff still isn't very robust - I think both the Autolocker and the FSS slow servos have to be manually restarted if megatron is shutdown/restarted for whatever reason. It doesn't seem to be a problem with the initctl routine itself - looking at the logs, I can see that init is trying to start both processes, but is failing to do so each time. To be investigated. The wiki procedure to restart this process is up to date.
GV Edit 0000 25 Aug 2017: I had to add a line to the script that checks MC transmission before enabling the PID loop. Change has been committed to svn. Now, when the MC loses lock or if the PSL shutter is kept closed for an extended period of time, the temperature loop doesn't rail.
I tried some DRMI locking again tonight, but had no success. Here is the story.
Looks like I will have to embark on the REFL55 LSC electronics investigation. I was able to successfully lock the PRC on carrier and sideband, and the Michelson lock also seems to work fine, all of which seem to point to a hardware problem with the REFL55 signal chain.
I did a quick check by switching the output of the REFL55 demod board to the inputs normally used by AS55 signals on the whitening board. Setting the whitening gain to +18dB for these channels had the same effect - ADC overflow galore. So looks like the whitening board isn't to blame. I will have to check the demod board out.
Looks like MC1 got another big kick just under 4 hours ago. None of the other optics show any evidence of a glitch so it seems unlikely that this was some sort of global event. It's been well behaved for ~2weeks now. IMC was unlocked. I manually re-aligned MC1, at which point the autolocker was able to lock the IMC.
Looking at this plot, it seems that LR and UL coils seem to have the largest kicks. UR barely saw it. Not sure what (if anything) to make of this - apparently the optic moved by ~20urad with the UR magnet approximately the pivot.
Attachment #1 - Photo of the revamped beat setup. The top panel has to be installed. New features include:
Attachment #2 - Power budget inside the box. Some of these FC/APC connectors seem to not offer good coupling between the two fibers. Specifically, the one on the front panel meant to accept the PSL light input fiber seems particularly bad. Right now, the PSL light is entering the box through one of the front panel connectors marked "PSL + X out". I've also indicated the beat amplitude measured with an RF analyzer. Need to do the math now to confirm if these match the expected amplitudes based on the power levels measured.
Attachment #3 - We repeated the measurement detailed here. The X arm (locked to IR) was used for this test. The "X" delay line electronics were connected to the X green beat PD, while the "Y" delay line electronics were connected to the X IR beat PD. I divided the phase tracker Hz calibration factor by 2 to get IR Hz for the Y arm channels. IR beat was at ~38MHz, green beat was at ~76MHz. The broadband excess noise seen in the previous test is no longer present. Indeed, below ~20Hz, the IR beat seems less noisy. So seems like the cleaning / electronics revamp did some good.
Further characterization needs to be done, but the results of this test are encouraging. If we are able to get this kind of out of loop ALS noise with the IR beat, perhaps we can avoid having to frequently fine-tune the green beat alignment on the PSL table. It would also be ideal to mount this whole 1U setup in an electronics rack instead of leaving it on the PSL table.
GV Edit: I've added better photos to the 40m Google Photos page. I've also started a wiki page for this box / the proposed IR ALS system. For the moment, all that is there is the datasheet to the Fiber Couplers used, I will populate this more as I further characterize the setup.
Is it better to mount the box in the PSL under the existing shelf, or in a nearby PSL rack?
Further characterization needs to be done, but the results of this test are encouraging. If we are able to get this kind of out of loop ALS noise with the IR beat, perhaps we can avoid having to frequently fine-tune the green beat alignment on the PSL table. It would also be ideal to mount this whole 1U setup in an electronics rack instead of leaving it on the PSL table
It seems like the main contribution to the RMS comes from the high frequency bump. When using the ALS loop to lock the arm to the beat, only the stuff below ~100 Hz will matter. Interesting to see what that noise budget will show. Perhaps the discrepancy between inloop and out of loop will go down.
The RGA was turned on 7 days ago. It's 46 C now. The X-arm room tem ~20 C
IFO pressure 6.5e-6 Torr at IT-Hornet gauge. Valve configuration vacuum normal.
What are the critical filesystems? I've also indicated the size of these disks and the volume currently used, and the current backup situation.
Not backed up
LDAS pulls files from nodus daily via rsync, so there's no cron job for us to manage. We just allow incoming rsync.
Local backup on /media/40mBackup on chiara via daily cronjob
Remote backup to ldas-cit.ligo.caltech.edu::40m/cvs via daily cronjob on nodus
Currently mounted on Megatron, not backed up.
Then there is Optimus, but I don't think there is anything critical on it.
So, based on my understanding, we need to back up a whole bunch of stuff, particularly the boot disks and root filesystems for Chiara, Megatron and Nodus. We should also test that the backups we make are useful (i.e. we can recover current operating state in the event of a disk failure).
Please edit this elog if I have made a mistake. I also don't have any idea about whether there is any sort of backup for the slow computing system code.
In addition to bootable full disk backups, it would be wise to make sure the important service configuration files from each machine are version controlled in the 40m SVN. Things like apache files on nodus, martian hosts and DHCP files on chiara, nds2 configuration and init scripts on megatron, etc. This can make future OS/hardware upgrades easier too.
I moved the axuiliary NPRO to the PSL table today and started setting up the optics.
The Faraday Isolator was showing a pretty unclean mode at the output so I took the polarizers off to take a look through them, and found that the front polarizer is either out of place or damaged (there is a straight edge visible right in the middle of the aperture, but the way the polarizer is packaged prevents me from inspecting it closer). I proceeded without it but left space so an FI can be added in the future. The same goes for the broadband EOM.
There are two spare AOMs (ISOMET and Intraaction, both resonant at 40MHz) available before we have to resort to the one currently installed in the PSL.
I installed the Intraaction AOM first and looked at the switching speed of its first order diffracted beam using both its commercial driver and a combination of minicircuits components. Both show similar behavior. The fall time of the initial step is ~110ns in both cases, but it doesn't decay rapidly no light but a slower exponential. Need to check the 0 order beam and also the other AOM.
It is unclear when this was last done, and since I modified the coil driver electronics for the ITMs and BS recently, I figured it would be useful to get this calibration done. The primary motivation was to see if we could resolve the discrepancy between the current ALS noise (using POX as a sensor) compared to the Izumi et. al. plot.
Because we are planning to change the coil driver electronics further soon anyways, we decided to do the calibration at a single frequency for tonight. For future reference, the extension of this method to calibrate the actuator over a wider range of frequencies is here. The procedure followed, and the relevant numbers from tonight, are as follows.
Once these calibrations were updated, we decided to control the arms with ALS, and look at the POX spectrum. Y-arm ALS wasn't so stellar tonight, especially at low frequencies. I can see the GTRY spot moving on the CCD monitor, so something is wonky. To be investigated. But the X arm ALS noise looked pretty good.
Seems like updating the calibration did the job; see the attached comparison plot.
I was having a chat with EricQ about this today, just noting some points from our discussion down here so that I remember to look into this tomorrow.
Can we make use of the Jetstor raid array for some kind of consolidated 40m CDS backup system? Once we've gotten everything of interest out of it...
Last night, while we were working on the ALS, I noticed the GTRY spot moving around (in PITCH) on the CCD monitor in the control room at ~1-2Hz. The operating condition was that the arm was locked to the IR, and the PSL green shutter was closed, so that only the arm transmissions were visible on the CCD screens. There was no such noticable movement of the GTRX spot. When looking at the out-of-loop ALS nosie in this configuration (but now with the PSL green shutter open of course), the Y arm ALS noise at low frequencies was much worse than the X arm.
Today, I looked into this a little more. I first checked that the Y-endtable enclosure was closed off as usual (as I had done some tweaking to the green input pointing some days ago). There are various green ghost beams on the Y-endtable. When time permits, we should make an effort to cleanly dump these. But the enclosure was closed as usual.
Then I looked at the in-loop Oplev error signal spectra for the ITMY and ETMY Oplev loops. There was high coherence between ETMYP Oplev error signal and GTRY. So I took a loop transfer function measurement - the upper UGF was around 3.5Hz. I increased the loop gain such that the upper UGF was around 4.5Hz, with phase margin ~30degrees. Doing so visibly reduced the angular movement of the GTRY spot on the CCD. Attachment #1 shows the Oplev loop TF after the gain increase, while Attachment #2 compares the GTRX and GTRY spectra (DC value is approximately the same for both, around 0.4). GTRY still seems a bit noisier at low frequencies, but the out-of-loop ALS noise for the Y arm now lines up much more closely with its reference trace from a known good time.
Y-arm ALS wasn't so stellar tonight, especially at low frequencies. I can see the GTRY spot moving on the CCD monitor, so something is wonky. To be investigated.
RP1 and RP3 roughing pump manual of Leybold D30A oily rotory pump
Fore pump of TP2 & TP3 Varian SH-100 Dry Scroll
TP2 and TP3 small turbo drag pump Varian 969-9361
TP2 and TP3 turbo controller Varian 969-9505
TP1 magnetically suspended turbo pump Osaka TG390MCAB, sn360 and controller TC010M and note : this pump running on 208VAC single phaseIt is not on the UPS !
Osaka Maglev Manual and Osaka Controller Communication Wiring
VC1 cryo pump CTI-Cryogenics Cryo Torr 8 sn 8g23925 SAFETY note: compressor single phase 208VAC and the head driver 3 phase 208VAC Compressor and driver have each separate power cord!
Installed at 40m wiki also
I don't understand why the 1st order diffracted beam doesn't go to zero when you shut off the drive. My guess is that the standing acoustic wave in the AO crystal needs some time to decay: f = 40 MHz, tau = 1 usec... Q ~ 100. Perhaps, the crystal is damped by the PZT and ther output impedance of the mini-circuits switch is different from the AO driver.
In any case, if you need a faster shut off, or want something that more cleanly goes to zero, there is a large (~1 cm) aperture Pockels cell that Frank Siefert was using for making pulses to damage photo diodes. There is a DEI Pulser unit near the entrance to the QIL in Bridge which can drive it.
there is a large (~1 cm) aperture Pockels cell that Frank Siefert was using for making pulses to damage photo diodes. There is a DEI Pulser unit near the entrance to the QIL in Bridge which can drive it.
I'll look for it tomorrow, but I haven't given up on the AOMs yet. I swapped in the ISOMET modulator today and saw the same behavior, both in 0th and 1st order. The fall time is pretty much identical. Gautam saw no such thing in the PSL AOM using the same photodetector.
In the meantime I prepared the fiber mode-matching but realized in the process that I had mixed up some lenses. As a result the beam did not have a waist at the AOM location and thus didn't have the intended size, although I doubt that this would cause the slower decay. I'll fix it tomorrow, along with setting up the fiber injection, beat note with the PSL, and routing the fiber if possible.
MC autolocker and FSS loops were stuck because c1psl was unresponsive. I rebooted it and did a burtrestore to enable PSL locking. Then the IMC locked fine.
c1susaux and c1iscaux were also unresponsive so I keyed those crates as well, after taking the usual steps to avoid ITMX getting stuck - but it still got stuck when the Sat. Box. connectors were reconnected after the reboot, so I had to shake it loose with bias slider jiggling. This is annoying and also not very robust. I am afraid we are going to knock the ITMX magnets off at some point. Is this problem indicative of the fact that the ITMX magnets were somehow glued on in a skewed way? Or can we make the situation better by just tweaking the OSEM-holding fixtures on the cage?
In any case, I've started listing stuff down here for things we may want to do when we vent next.