All slow machines (except c1auxex) were dead today, so I had to key them all. While I was at it, I also decided to update MC autolocker screen. Kira pointed out that I needed to change the EPCIS input type (in the RTCDS model) to a "binary input", as opposed to an "analog input", which I did. Model recompilation and restart went smooth. I had to go into the epics record manually to change the two choices to "ENABLE" and "DISABLE" as opposed to the default "ON" and "OFF". Anyways, long story short, MC autolocker controls are a bit more intuitive now I think.
Reboot for c1susaux and c1iscaux today. ITMX precautions were followed. Reboots went smoothly.
IMC is shuttered while Jon does PLL characterization...
FSS slow wasn't running so PSL PZT voltage was swinging around a lot. Reason was that was c1psl unresponsive. I keyed the crate, now it's okay. Now ITMX is stuck - Johannes just told be about an un-elogged c1susaux reboot. Seems that ITMX got stuck at ~4:30pm yesterday PT. After some shaking, the optic was loosened. Please follow the procedure in future and if you do a reboot, please elog it and verify that the optic didn't get stuck.
Eurocrate key turning reboots today morning for and c1susaux, c1auxex and c1auxey. Usual precautions were taken to minimize risk of ITMX getting stuck.
The IFO hasn't been aligned in ~1week, so I recovered arm and PRM alignment by locking individual arms and also PRMI on carrier. I will try recovering DRMI locking in the evening.
As far as MC1 glitching is concerned, there hasn't been any major one (i.e. one in which MC1 is kicked by such a large amount that the autolocker can't lock the IMC) for the past 2 months - but the MC WFS offsets are an indication of when smaller glitches have taken place, and there were large DC offsets on the MC WFS servo outputs, which I offloaded to the DC MC suspension sliders using the MC WFS relief script.
I'd like for the save-restore routine that runs when the slow machines reboot to set the watchdog state default to OFF (currently, after a key-turning reboot, the watchdogs are enabled by default), but I'm not really sure how this whole system works. The relevant files seem to be in the directory /cvs/cds/caltech/target/c1susaux. There is a script in there called startup.cmd, which seems to be the initialization script that runs when the slow machine is rebooted. But looking at this file, it is not clear to me where the default values are loaded from? There are a few "saverestore" files in this directory as well:
Are the "default" channel values loaded from one of these?
Eurocrate key turning reboots today morning for c1psl and c1aux.c1auxex and c1auxey are also down but I didn't bother keying them for now. PSL FSS slow loop is now active again (its inactivity was what prompted me to check status of the slow machines).
Note that the EPCIS channels for PSL shutter are hosted on c1aux.But looks like the slow machine became unresponsive at some point during the weekend, so plotting the trend data for the PSL shutter channel would have you believe that the PSL shutter was open all the time. But the MC_REFL DC channel tells a different story - it suggests that the PSL shutter was closed at ~4AM on Sunday, presumably by the vacuum interlock system. I wonder:
The folding crane was fixed and tested this morning by the NNN rigging company. Pictures will be posted by Steve in the morning.
Afterwards, the ITM-east door was installed, jam-nuts checked. No high voltage was on for the in-vac PZTs.
The annulus spaces were roughed down to 350mTorr by Roughing Pump RP1. For this operation, we removed the low flow valve from the RP1 line.
After the spaces came down to ~400 mTorr, we closed their individual valves.
Warning: The VABSSC1 and VABSSC0 valves are incorrect and misleadingly drawn on the Vacuum overview screen.
Our idea is to have a much slower pumpdown this time than the last time when we had a hurricane kick up the dust. Looks like it worked, but next time we should do only 1/2 turn.
The pumpdown started at 4 PM (2300 UTC). At 10 PM, we (Jenne, Jan, and I) opened up the RV1 valve to full open. That's the second inflection point in the plot.
As per Steve's instructions, at 12:43 AM, I used the following steps to stop the pumpdown until the morning:
We have reached 200 Torr at 12 hours of slow pumping speed. Kiwamu stopped the pumping for 11 hrs last night .and I restarted it this morning.
Now RV1 is fully open with butterfly valve in place and the second roughing pump RP3 was just turned on.
How to stop pumping:
1, close RV1 manual valve with torque wheel
2, close V3
3, turn off roughing pumps RP1 & RP3
4, disconnect metal hose connection to butterfly valve
The pump down continued this morning by the removal of the butterfly valve. Two roughing pumps were used to reach 500 mTorr
The Maglev monitoring MEDM screen "Rotating" indicator is not working. It is on all times. Please look at Maglev controller monitor for real information.
Pump down is completed.
Configuration: vacuum normal after 86 days at atm CC1 = 1e-5 Torr
IFO is hungry for light (and maybe some goulash with a little paprikash too)
Atm 2 is showing the butterfly valve that closes down down the orifice at higher pressure to slow down the pumping speed.
See elog entry #2573
Bob and Steve closed BS chamber with the help of the manual Genie lift and the pump down started. The PSL shutter was closed and manual block was placed in the beam path. High voltage power supplies were checked to be off.
Pumping speed ~ 1 Torr/min was achieved at 1/8 of a turn opened roughing valve RV1
I have installed a slow start throttle valve in front of V3 This spring loaded valve will cut down on the flow at high pressures. There will be no more sand storme
and static built-up during pump down.
The PSL shutter was closed. The beam path blocked two places. High voltage power supplies to IOO and OMC PZT were checked to be off. Oplevs are off.
The south arm green cavity was misaligned yesterday
We would like to keep the vent speed at 1 torr / min. I'm venting with N2 now up to 25 PSI. We have 3 cylinder of instrument grade air inside the lab. Additional supply will arrive later. It can be as late as 1pm
Blocked PSL output beam into IFO
Checked: HV at IOO & OMC are off, jam nuts in position,
Closed V1 and VM3, opened VV1 to N2 regulator
We are venting at 1 Torr/min rate
For those of you who want to see plots from slower scan.
Small earth quakes and suspensions. Which one is the most free and most sensitive: ITMX
If I catch anyone putting small booties into the large bootie bin, I will make said person eat small booties.
Gautam and Steve,
The medm monitor & vac control screens were totally blank since ~ May 24, 2017 Experienced vacuum knowledge is required for this job.
IDENTIFY valve configuration:
How to confirm valve configuration when all vac mons are blank? Each valve has a manual-mechanical position indicator. Look at pressure readings and turbo pump controllers. VAC NORMAL configuration was confirmed based on these information.
Preparation: disconnect valves ( disconnect meaning: valve closes and stays paralized ) in this sequence VC2, VC1 power, VA6, V5, V4 & V1 power, at ifo pressure 7.3E-6 Torr-it ( it = InstruTech cold cathode gauge )
This gauge is independent from all other rack mounted instrumentation and it is still not logged.
Switching to this valve configuration with disconnected valves will insure NOT venting of the vacuum envelope by accidental glitching voltage drop or computer malfunction.
RESET v1Vac1 .........in 2-3 minutes........ ( v1Vac1 - 2 ) the vac control screen started reading pressures & position
Connected cables to valves (meaning: valve will open if it was open before it was disconnected and it will be control able from computer ) in the following order: V4, V1 power, V5, VA6, VC2 & VC1 power, at ifo 2E-5 Torr-it.....
....vac configuration is reading VAC NORMAL,
ifo 7.4E-6 Torr-it
We have to hook up the it-cold cathode gauge to be monitored - logged ! this should be the substitute for the out of order CC1 pressure gauge.
We corrected the MICH locking snap file C1configure_MI.req and saved an updated C1configure_MI.snap. Now the 'Restore MICH' script in IFO_CONFIGURE>!MICH>Restore MICH works. The corrections included adding the correct rows of PD_DOF matrices to be at the right settings (use AS55 as error signal). The MICH_A_GAIN and MICH_B_GAIN needed to be saved as well.
We also were able to get to PRMI SB resonance. PRM was misalgined earlier from optimal position and after some manual aligning, we were able to get it to lock just by hitting IFO_CONFIGURE>!PRMI>Restore PRMI SB (3f).
Yesterday, I had the great pleasure to solder a tiny 4 x 4 mm op amp with 16 legs (AD8336).
I figured out that the best and fastest way to do it is
This morning the pencil soldering iron of our Weller WD2000M Soldering Station suddenly stopped working and got cold after I turned the station on. The unit's display is showing a message that says "TIP". i checked out the manual, but it doesn't say anything about that. I don't know what it means. Perhaps burned tip?
Before asking Steve to buy a new one, I emailed Weller about the problem.
There should be a supply of extra tips in the Blue Spinny Cabiney (I can never remember it's French name....) The drawer is something like the top row of one of the bottom sets of drawers. You can pick the shape of tip you want, and stick it in.
Albeto and Koji
We took the tip replacement from the blue tower.
I am looking at http://www.cooperhandtools.com/brands/weller/ for ordering the tips.
The burnt one seems to be "0054460699: RT6 Round Sloped Tip Cartridge for WMRP Pencil" We will buy one.
The replaced one is "0054460299: RT2 Fine Point Cartridge for WMRP Pencil" We will buy two.
I like to try this: "0054460999: RT9 Chisel Tip Cartridge for WMRP Pencil" We will buy one.
Q and Ignacio were taking a second look at the Pentek interface board which we're using to acquire the POP QPD, ALS trans, and MCF/MCL channels. It has a differential intput, two jumper able whitening stages inside and some low pass filtering.
I noticed that each channel has a 1.5 kHz pole associate with each 150:15 whitening stage. It also has 2 2nd order Butterworth low pass at 800 Hz. Also there's a RF filter on the front end. We don't need all that low passing, so I started modifying the filters. Tonight I moved the 800 Hz poles to 8000 Hz. Tomorrow we'll move the others if Steve can find us enough (> 16) 1 nF SMD caps (1206 NPO).
After this those signals ought to have less phase lag and more signal above 1 kHz. Since the ADC is running at 64 kHz, we don't need any analog filtering below 8 kHz.
Solid works 2010 was installed to m3, an windows machine in the control room.
Have fun !
Each bottle has matched seals. They are not interchangeable.
It is critical that the solvent do not reach the rubber bulb. Practice with the pipet.
In case of solvent touching the suction bulb: do not let the solvent go back into the bottle! Remove bulb, let it dry out and rinse pipet.
It is essential that the solvent bottle must be rinsed and refilled if it's content met with the rubber bulb.
Use glass syringe with SS needle in critical application: Hamilton ~0.1 ml
I ran the ASS/ADS for the arms because the X-arm was way out. There was also some problem with its locking due to bad ramps in FM2. I copied over the filters from YARM and then adjusted some of the ramps and thresh trigs in the filter file until the transients in POX got smaller. Basically, you should not really be ramping on Integrators. Secondly, we should do some testing when adjusting the filter parameters.
I hooked up the 4395 to the MC servo board OUT2 so that we can monitor the error point when the PCDRIVE goes nuts.
Somehow some DAQ channels for C1SUS have disappeared from the DAQ channel list.
Indeed there are only a few DAQ channels listed in the C1SUS.ini file.
I ran the activateDQ.py and restarted daqd.
Everything looks okay. C1SUS and C1PEM were restarted because they became frozen.
I found again the ini files had been refreshed.
I ran the activateDQ.py script (link to the script wiki page) and restarted the daqd process on fb.
The activateDQ.py script should be included into the recompile or rebuild scripts so that we don't have to run the script everytime by hands.
I am going to add this topic on the CDS todo list (wiki page).
Found some LSC scripts didn't run on pianosa. Particularly all the scripts on the C1:IFO_CONFIGURE screen don't run.
They need to be fixed.
When I came to the 40m, I found most of the FB signals are dead.
The suspensions were not dumped but not too much excited. Use watchdog switches to cut off the coil actuators.
Restarted mxstream from the CDS_FE_STATUS screen. The c1lsc processes got fine. But the FB indicators for c1sus, c1ioo, c1iscex/y are still red.
Sshed into c1sus/ioo, run rtcds restart all . This made them came back under control.
Same treatment for c2iscex and c1iscey. This made c1sus stall again. Also c1iscey did not come back.
At this point I decided to kill all of the rt processes on c1sus/c1ioo/c1iscex/c1iscey to avoid interference between them.
And started to restart from the end machines.
c1iscex did not come back by rtcds restart all.
Run lsmod on c1iscey and found c1x05 persisted stay on the kernel. rmmod did not remove the c1x05 module.
Run software reboot of c1iscey. => c1iscey came back online.
c1iscey did not come back by rtcds restart all.
Run software reboot of c1iscex. => c1iscex came back online.
c1ioo just came back by rtcds restart all.
c1sus did not come back by rtcds restart all.
Run software reboot of c1sus => c1sus came back online.
This series of restarting made the fb connections of some of the c1lsc processes screwed up.
Run the following restarting commands => all of the process are running with FB connection.
rtcds restart c1sup
rtcds restart c1ass
rtcds restart c1lsc
Enable damping loops by reverting the watchdog switches.
All of the FE status are green except for the c1rfm bit 2 (GE FANUC RFM CARD 0).
First, things that were done:
Things that I noticed:
I think there are two things that could be happening here, given the above information:
About the analog CARM control with ALS:
We're looking at using a Sigg designed remotely switchable delay line box on the currently undelayed side of the ALS DFD beat. For a beat frequency of 50MHz, one cycle is 20ns, this thing has 24ns total delay capability, so we should be able to get pretty close to a zero crossing of the analog I or Q outputs of the demod board. This can be used as IN2 for the common mode board.
Gautam is testing the functionality of the delay and switching, and should post a link to the DCC page of the schematic. Rana and Koji have been discussing the implementation of the remote switching (RCG vs. VME).
I spent some time this afternoon trying to lock the X arm in this way, but instead of at IR resonance, just wherever the I output of the DFD had a zero crossing. However, I didn't give enough thought to the loop shapes; Koji helped me think it through. Tomorrow, I'll make a little pomona box to go before the CM IN2 that will give the ALS loop shape a pole where we expect the CARM coupled cavity pole to be (~120Hz), so that the REFL11 and ALS signals have a similar shape when we're trying to transition.
The common mode board does have a filter for this kind of thing for single arm tests, but puts in a zero as well, as it expects the single arm pole, which isn't present in the ALS sensing, so maybe I'll whip up something appropriate for this, too.
Something odd is happening with the CM board. Measuring from either input to OUT1 (the "slow output") shows a nice flat response up until many 10s of kHz.
However, when I connect my idependently confirmed 120Hz LPF to either input, the pole frequency gets moved up to ~360Hz and the DC gain falls some 10dB. This happens regardless if the input is used or not, I saw this shape at a tee on the output of the LPF when the other leg of the tee was connected to a CM board input.
This has sabotaged my high bandwidth ALS efforts. I will investigate the board's input situation tomorrow.
I want to collect some data with the arms locked to investigate the possibility/usefullness of having seismic feedforward implemented for the arms (it is already known to help the IMC length and PRC angular stability at low frequencies). To facilitate diagnostics I modified the file /users/Templates/Seismic/Seismic_vs_TRXTRYandMC.xml to have the correct channel names in light of Lydia's channel name changes in 2016. Looking at the coherence data, the alignment of the cartesian coordinate system of the Seismometers at the ends and the global interferometer coordinate system can be improved.
I don't know if for the MISO filter design if there is any difference in using TRX/TRY as the target, or the arm length control signal.
Data collection started at 1249018179. I've setup a script running in a tmux shell to turn off the LSC enable in 2 hours.
[Koji and Kiwamu]
We did some more vacuum works today. It is getting ready to pump down.
(what we did)
- alignment of the POY mirrors. Now the beam is coming out from the ITMY chamber successfully
- leveling of the tables (except for the IOO and OMC chamber)
- realigned the beam axis down to the Y arm because the leveling of the BS table changed the alignments.
- installed IP_POS mirrors
- aligned the green beam and made it overlap with IR beam path.
- repositioned green steering mirrors since one of them are too close to the dark beam path
[Rana, Suresh, Kiwanu]
We did the following things:
We did the following things:
* taking the VCO stability data from the error signal instead of the feedback
* taking the VCO stability data from the error signal instead of the feedback
* tried calibrating the signal but confused
* tried calibrating the signal but confused
* increased the modulation depth of the green end PDH.
We found that a cable coming out from the VCO box was quite touchy. This cable was used for taking the feedback signal.
When we touched the cable it made a big noise in the feedback. So we decided to remove the cable and take the signal from the error point (i.e. just after the mixer and the LPF.)
In order to correct that signal to the one in terms of the feedback signal, we put a digital filter which is exactly the same as that of the PLL (pole at 1.5 Hz, zero at 40 Hz, G=1) .
However for some reasons the signal shown in the digital side looked completely mis-calibrated by ~ 100. We have no idea what is going on.
Anyway we are taking the data over tonight because we can correct the signal later. The 2nd round data started from AM1:40
What is the point to use the error instead of the feedback? It does not make sense to me.
If the cable is flaky why we don't solder it on the circuit? Why we don't put a buffer just after the test point?
It does not make sense to obtain the error signal in order to estimate the freeruning noise without the precise loop characterization.
(i.e. THE FEEDBACK LOOP TRINITY: Spectrum, Openloop, Calibration)
RA: I agree that feedback would be better because we could use it without much calibration. But the only difference between the "error signal" and the "feedback signal" in this case is a 1.6:40 pole:zero stage with DC gain of 0 dB. So we can't actually use either one without calibration and the gain between these two places is almost the same so they are both equally bad for the SNR of the measurement. I think that Suresh and Kiwamu are diligently reading about PLLs and will have a more quantitative result on Monday afternoon.
[Koji / Kiwamu]
We did several tests to figure out what could be a source of the computer issue.
The Dolphin switch box looks suspicious, but not 100% sure.
(what we did)
+ Removed the pciRfm sentence from the c1x04 model to disable the Dolphin connection in the software.
+ Found no difference in the Makefile, which is supposed to comment out the Dolphin connection sentences.
==> So we had to edit the Makefile by ourselves
+ Did a hand-comilpe by editing the Makefile and running a make command.
+ Restarted the c1x04 process and it ran wihtout problems.
==> the Dolphin connection was somehow preventing the c1x04 process from runnning.
+ Unplugged the Dolphin cables on the back side of the Dolphin box and re-plug them to other ports.
==> didn't improve the issue.
+ During those tests, c1lsc frequently became frozen. We disabled the automatic-start of c1lsc, c1ass, c1oaf by editting rtsystab.
==> after the test we reverted it.
+ We reverted all the things to the previous configuration.
For the EY, instead of balancing the table, I just moved the weight approximately so that the ETMY OSEMS were at half light, but didn't check the level since ETMY is the only optic.
Some notes on OMC/AS work (Aaron/Gautam can amend/correct):
- Beam is now well centered in OMC MMT. Hits input coupling mirror and cleanly exits the vacuum to the AS table.
- Didn't see much on OMC trans, but PDs are good based on flashlight test.
- just before closing, re-aligned beam in yaw so that it gets close to the east screw on the input coupler. Aaron and I think we maybe saw a flash there with the OMC length PZT being driven at full range by a triangle wave.
- with OMC Undulators (aka tip/tilt PZT mirrors) energized, the beam was low on PZT1 mirror. We pitched ITMY by ~150 micro-rad and that centered the beam on PZT1 mirror. ITMY-OL is probably not better than 100 urad as a DC reference?
- We checked the range of Undulator 1 and we were getting ~5 mrad of yaw of the beam for the full range, and perhaps half of that in pitch. Rob Ward emailed us from Oz to say that the range is robably 2.7 mrad, so that checks out.
Even if the ITMY has to be in the wrong position to get the beam to the OMC, we can still do the heater tests in one position and then do the OMC checkout stuff in the other position.
Gautam suspects that there is a possible hysterical behaviour in the Undulators which is related to the MC3 glitching and the slow machine hangups and also possibly the illuminati.
-We noticed a ghost beam that from MC REFL (MMT2) that should be dumped during the next vent--it travels parallel to the OMC's long axis and nearly hits one of the steering mirrors for OMC refl.
-We measured the level of the table and found it ~3 divisions off from level, with the south end tilted up
-Gautam rotated and slightly translated OM5 to realign the optic, as expected. No additional optics were added.
-Gautam and I tested the TT piezo driver. We found that 3.6V on the driver's input gave 75V (of 150V) at the output, at least for yaw on piezo 1. However, as Gautam mentioned, during testing it seemed that the other outputs may have different (nonzero) offset voltages, or some hysterisis.
Here I show two photos of the latest ABSL (ABSolute Length measurement) setup.
Figure.1 : A picture of the ABSL setup on the AP table.
The setup has been a little bit modified from the before (#4923).
As I said on the entry #4923, the way of sampling the ABSL laser wasn't so good because the beam, which didn't go through the faraday, was sampled.
In this latest configuration the laser is sampled after the faraday with a 90% beam splitter.
The transmitted light from the 90% BS (written in pink) is sent to the PSL table through the access tube which connects the AP and PSL table .
FIgure.2: A picture of the ABSL setup on the PSL table.
The 10% sampled beam ( pink beam in the picture) eventually comes to the PSL table via the access tube (the hole on the left hand side of the picture).
Then the ABSL beam goes through a mode matching telescope, which consists of a combination of a concave and a convex lens.
The PSL laser (red line in the picture) is sampled from a point after the doubling crystal.
The beam is combined at a 50 % BS, which has been setup for several purposes( see for example #3759 and #4339 ) .
A fast response PD (~1 GHz) is used for the beat-note detection.
Good progress in IFO locking tonight, with the arm powers reaching about half the full resonant maximum.
Still to do is check out some weirdness with the OMC DAC, fix the wireless network, and look at c1susvme2 timing.
Today we did the following works in order to get ready for the new CDS test.
- solved the DAC issue.
- checked all the channel assignments of the ADC and the DAC.
- preparation for modification of the AA filter chassis.
- checked DAC cable length.
- connected the power cables of the BO boards to Sorensens.
Although we performed those works, we still couldn't do the actual damping tests.
To do the damping tests, we have to modify the AA chassis to let the SCSIs go in it. Now Joe and Steve are working for this issue.
Also we found that we should make three more 37pin Dsub - 40pin IDC cables.
But this is not a critical issue because the cables and the connectors are already in our hands. So we can make them any time later.
Now all the DAC channels are working correctly.
There had been a combination of some issues.
When I posted the elog entry last time, the DAC was not working at all (see here).
But in the last week Joe found that the IO process didn't correctly run. He modified the IOP file named 'c1x02.mdl' and ran it after compiling and installing it.
This made the situation better because we then were able to see the most of the signals coming out from the DACs.
However we never saw any signals associated with SIDE_COILs.
We checked the DAC cards, their slots and their timing signals. But they all were fine.
At that time we were bit confused and spent a couple of days because the DAC signals appeared at a different slot some time after we rebooted the computer. Actually this issue still remains unsolved...
Finally we found that SIDE_COILs had an input matrix which didn't show up in the medm screen.
We put 1 in the matrix and we successfully got the signal coming out from the DAC.
We checked all the channel assignments of the DACs and the ADCs.
All the channels are assigned correctly (i.e. pin number and channel name).
We have been planning to put the SCSI cables into the AA chassis to get the ADC signals.
As Joe said in the past entry (see here) , we need a modification on the AA chassis to let the SCSIs go in it.
Joe and Steve will put an extension component so that we can make the chassis wider and eventually SCSI can go in.
(DAC cable length)
In the default plan we are going to reuse some DAC cables which are connected to the existing systems.
To reuse them we had to make sure that the length of those cables are long enough for the new CDS.
After stopping the watchdogs, we disconnected those DAC cables and confirmed they were long enough.
Now those cables are connected to the original place where they have been before.
The same test will be performed for the binary outputs.
(power cables to Sorensens)
Since the binary output boards need +/- 15V power, we hooked up the power cables to Sorensens sitting on the new 1X5 rack.
After cabling them, we turned on the power and successfully saw the green LEDs shining on the back panel of the boards.
Since we have setup POP22 PD now(elog #8192), we could confirm that sideband power builds up when PRMI is sideband locked.
Here's some plot of PRC intra-cavity powers and MICH,PRCL error signals. As you can see from POP22, we locked at the peak of 11MHz sideband. There was oscillation at ~500 Hz, but we couldn't optimize the gain yet.
Here's 30 sec movie of AS, POP, REFL when acquiring (and losing) PRMI sideband lock. It was pretty hard to take a movie because it locks pretty seldom (~1 lock / 10 min).
For MICH lock, we used ITMs instead of BS for reducing coupling between PRCL.
Also, AS55 phase rotation angle was coarsely optimized by minimizing MICH signal in I.
For PRCL lock, we used REFL55_I_ERR instead of REFL33_I_ERR. It had better PDH signal and we coarsely optimized phase rotation angle by minimizing PRCL PDH signal in Q.
== PRMI sideband ==
MICH: AS55_Q_ERR, AS55_PHASE_R = -12 deg, MICH_GAIN = -0.1, feedback to ITMX(-1),ITMY(+1)
PRCL: REFL55_I_ERR, REFL55_PHASE_R = 70 deg, PRCL_GAIN = -15, feedback to PRM
We set POP22_PHASE_R = -170 deg by minimizing Q.
- We tried to use REFL55_Q_ERR to lock MICH, but couldn't. It looks like REFL error signals are bad.
- We tried to use POP22_I_ERR to trigger PRCL lock, but it didn't work.