J. Kissel

We've discovered that the H1 SUS MC2 compensation filters are incorrect for the M2 stage coil driver, having never been changed after the analog coil driver was swapped out for a beefier drive (see LHO aLOG 9956). It turns out, by lucky coincidence, we've been operating the new coil driver in a state (State 1) where it's frequency response is flat, and the compensation filters -- though wrong -- cancel each other to also be flat, so the overall crossover loop gains remained unaffected.

Just to be sure, however, I too a "pre" measurement of each crossover of the IMC_L loop gains. I attach the results, and summarize below.

Crossover     UGF [Hz]    Phase Margin [deg]
MC_L/MC_F     14.5                39
M2/M3         7                   38
M1/M2         0.125               36 
These numbers are comparable to LLO's numbers (see, e.g. LLO aLOG 4331).

Templates can be found here:
/ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/MC2/Common/Data/
2014-02-11_H1IMC_M1-M2_Crossover_OLGTF.xml
2014-02-11_H1IMC_M2-M3_Crossover_OLGTF.xml
2014-02-11_H1IMC_MCL-MCF_Crossover_OLGTF.xml

I caused a HEPI trip this evening, messing with arm cavity slow feedback to HEPI. 

While trying to restet this, I once again became annoyed by how the isolate script sets the current setpoint to something other than the target setpoint for Ry and RZ.  Forgetting this is part of why it took us several hours to recover from the hepi pump trip this afternoon, and it seems like by continuing to have the script do this we are shoting ourselves in the foot.  I have heard that the script does this because of fear that HEPI can't handle these large offsets, but we have been using these large target positions for more than a month, so it seems HEPI can handle them.  If that's true, is it possible to fix this script?

Having a closer look at the offsets, I noticed that the location was not coming back to the set point even after waiting a long time.  I attached a plot of the target location over the last 60 days, it has really never been at the set point.

AS far as I understood, this after noon after our long struggle to get ETMX back after the hepi pump trip, Jim got it back one DOF at a time using 250mHz blends on stage 1, Tcrappy on stage 2, and using the 60 Hz notch in the stage 2 controllers (which is for level 3 but while we are still using level 2 controlers we need to engage FM5 by hand). (correct me if I'm wrong Jim)

Instructions for what worked for me now are:

HEPI:

untrip watchdog

Comands 2, Isolate level 1

Important! Check that DC bias current setpoints match the target setpoints.

ISI:

Set T240 watchdog thresholds to something large

Set stage 1 blends to 250, isolate level 3.

Wait a long time, get distracted by other work, come back in a half hour....

change stage 1 blends to Tcrappy

Isolate stage 2 level2 with Tcrappy

All set!

The HAM-ISI models, scripts and screens were successfully updated.

The update was tested on HAM2-ISI, before being ported to the other platforms. Test performed are:

• h1isiham2.mdl -r7102
• h1isiham3.mdl -r7104

Foton files had to be updated on HAM2 and HAM3 so the level 3 controllers would be in the correct filter banks for the updated command scripts to work. Filters were not modifed.

The content of the update is detailed in DCC T140012. See the attached Update_Log.txt For more details about the sequence of the update at LHO.

Work was performed under WP #4434, which is now closed

Restarted the DAQ to support Hugo's HAM ISI model changes and incorporate Daniel's latest X1PLC2 channel list.

Installed the following electronics at EX per D1001423-v18.
D1002559 ISC Whitening Chassis for WFS_A
D0902796 WFS I/Q Demodulator WFS_A
D1100905 Demodulator Patch Panel
D0902796 WFS I/Q Demodulator WFS_A
D1002559 ISC Whitening Chassis for WFS_B
D1100749 Legacy iLIGO WFS PD Interface

Items still needed for tomorrow:
1. Power up electronics
2. Finish running long field cables to 384 Channel Acromag Binary and AA chassis
3. RF cabling from field rack to ISCTEX table

Filiberto  Clara

I loaded the Tcrappy blend filters on the BS ISI today, and reworked some level 3 controllers with a more aggressive boost (while preserving the .m-file with the old working controllers!), but it's not fully working yet. I can get st1 on the new controllers, but it trips as soon as I turn any of the boosts on. For now I'm leaving the ISI on the old level 2 controller. I'll look at it again tomorrow.

I've moved IOHT2R into its proper position. The plan for tomorrow will be to transition the LVEA in the afternoon while the red light working group has PRM aligned to begin aligning the table to the SM2 trans beams.

A crashed ops machine ate my homework, so this isn't very complete...

Earthquake this morning tripped ITMX and ETMX, and others. ETMX ISI didn't come back up until 1300. There has been elevated microseism all day due to high winds.

Fil at Ex, mid-Y, Ex again

Fire Dept at EY 0900

HEPI pump station down at ex this morning, hugh down to diagnose 1100

MarkB working on tip-tilt filters 1300?

JeffB at ham4 1330

Mitch & Justin ACB cleanroom 1330

JoeD h2 psl enclosure 1200-1300

JeffL in LVEA ~1300

Me loading new isolation lvl3 filters in the BS ISI 1515

Calibration gain for MC1 MC2 MC3 alignment offsets was modified after Paul's measurement :

(Alexa, Sheila)

Today we had trouble locking the green arm...

1. We had hepi/isi trouble as aloged by Hugo and Hugh
2. The output matrix between LSC-CARM and MC2 was zeroed and it took us some time to realize. Note: we zeroed the output matrix between LSC-SRCL and MC2. 
3. The ETMX motion at around .3 Hz is too large (see attached plot -- the referenes are from previous days).

Starting to update the models, scripts and screens for HAM-ISI. Work is performed under WP #4434

Details about the update can be found in DCC T1400012

Yesterday with completion of TMS Alignment, may have jumped the gun with securing the assembly.  Forgot that SEI will want to float, balance, and test the ISI.  So the EQ Stop Tooling (aka Alignment Stabilization Tool) needed to be removed.  Before removing it, the Swing Stop Cart was installed, and then the EQ Stops were removed.  So now the TMS is ready for the ISI to be tested.  So with SUS's work this afternoon and SEI's work for the next few days, that would put us back on deck to secure the TMS next week most likely.

TMS TO DO List Post-SEI Test Stand Work:

• Re-install EQ Stops
• Remove Swing Stop
• Install Safety Stop/Support Tooling
• Bag up entire assembly
• Check cables for ground shorts before Cartridge move.

I swapped in a new HTTS filter file with corrected dewhitening filters (what claimed to be 10:0.4 had actually been 40:1.6). I checked that RM1 and RM2 still damp stably.

I've started on a round of undamped TFs on RM1 and RM2 to check that I get the expected results without post-hoc corrections.

I created a new version of the HTTS TF plotting script, plotHTTS_ddtfs_M1.m, to correct for the fact that the wrong dewhitening filter has been installed at both sites, and that the LHO ISC HAM-A coil drivers have only recently been changed per E1201027. Setting meas.badFilt = '40:1.6' (rather than ' ' or anything else) enables the correction for the bad filter, and meas.E1201027=true enables the new gains.

The actual hardware whitening filter is 0.4:10 per D1002818/D080276. The dewhitening filter installed in Slot 1 of the the OSEMINF blocks claims to be 10:0.4 but has actually been 40:1.6.

After checking with Stuart to ensure that there was no LLO data that hadn't been committed, I reran plotHTTS_ddtfs_M1.m on all the data sets listed in measList in plotallhtts_tfs_M1.m, so as to regenerate the summary .mat files and plots at ^/trunk/HTTS/ifo/optic/SAGM1/Results . 

I used meas.badFilt = '40:1.6' in all cases and meas.E1201027=true for all except the measurements of H1:RM1 and H1:RM2 in 11/2013, which were before the LHO resistor change. I lost a day to head-scratching before I realized that the L1 resistors had been changed shortly after the ECR was approved in 12/2012, whereas the LHO ones were changed almost exactly a year later (12/2/13, LHO alog 8792).

As might be hoped, the new plots were free of the hump caused by the misalignment of poles and zeroes between hardware and software. The new files have been committed to the SVN.

The two attached comparison plots show  L1:RM1, L1RM2, H1:RM1 and H2:RM2 before (2013-11-25) and after (2014-02-12) the fixes. Note that the H1 data in the second plot is from later (12/20/13), and fixes a second filter issue that has not been identified but only affects the 11/24/13 data).

I prepared a new filter file for LHO with the correct dewhitening filters, /opt/rtcds/userapps/release/sus/h1/filterfiles/H1SUSHTTS_dewhitefix.txt , and will install it at the earliest convenient opportunity.

I have updated the CDS MEDM overview screens:
  added new h1lscaux model
  changed the WD colors to support HIFOX

Fluid level trip.  Found the Pump Controller (not servo) red lite off--other than power failure, sure indication of Fluid Level trip.

Turn on Process:

Since I've hardwired the FWD button, the controller will start at the Servos Command as soon as the Green Start Button is pushed, so:

Must turn down the Servo Output--On Pump Controller medm set servo set point to zero or manually run down the output.

Press Green Start button on Controller Cabinet, Ramp up servo set point to 80psi, or step up output manually to near 80 and then switch servo to Auto mode.

Warning--Don't overshoot the pressure too much or the level may trip again or if you really overshoot and the level doesn't trip, the pressure relief valve will release.

After I got the servo running again, I pulled up the trip switch and found the trip level was only ~1/16" below the run level.  Of course to do this test you have to trip the switch and start all over again.  I then lowered the switch ~1/4" so we should be good for a while.

I have a scale on the site glass and a white board logging the running levels and now I have a trip level.  We have been trending down a bit over the past few months.  I have a couple minor leaks at the pump station, maybe something like a teaspoon a month.  That combined with evaporation and the large servo load (really minor affect I believe) led to the trip.  I'll start a regular maintenance routine of noting the running fluid level and lowering the trip switch to keep ahead of it.

Patrick T., Sheila D.

We went to check on the H1 PSL environment. We verified that all the HEPA fans are off. We couldn't tell if the make up air fan was running, so we commanded it to run again. It was and still is set at 20% fan speed.

plots attched.

[Stefan, Lisa, Evan, Kiwamu]

Our goal tonight was to get the IR transmitted light centered on the transmon QPDs. A coarse alignment was established. We still need to do a fine alignment with the picomotors.

QPD centering:

We had never aligned this path with the actual IR beam, and neither QPDs had a beam on them. As discussed and suggested in the last integration meeting, we started this mission from a scan of the TMS in order to find an IR beam with the QPDs. Moving the TMSX in an almost random way, we found a beam which was flashing as the carrier light resonated in the cavity. The yaw angle needed to be twisted by roughly 100 urad to get the beam on the QPDs. Then, keeping the flashing beam on the QPD by steering the picomotors (M4 and M14), we steered the TMSX back to the nominal angle. This operation was successful. Then we moved onto a fine adjustment by locking the main infrared light to the arm cavity (the detail of the locking procedure can be found in alog 9644).

The fine tuning was very frustrating. We kept loosing the lock because of the roll mode of MC2 at 40 Hz (see awiki for HSTS resonances ) which then saturates everything and breaks the lock. Plus the spot position on the two QPDs didn't seem to be conversing by moving a combination of the two picomotors. The spot behaved as if the picomotors are degenerate. It is possible that, since the time for tweaking the picotomors was limited by the stability of the locking, we confused ourselves in the rush. This needs to be revisited. Anyway, a good news is that we now have a beam on both the QPDs and therefore we can do the fine adjustment anytime when we get a chance.  Also we did an estimation of the power on the QPD, because we needed to clarify if the beam we saw was the main beam or a ghost. This is summarized in Evan's log (see alog 1006).

Some other things:

Later tonight, I tried to engage the AO path. Though I haven't succeeded. The idea is to have a low cross over frequency which then allows us to (re)insert the notch filter for the 40 Hz roll mode. However the loop was not so stable and everytime when I changed the AO path gain in the common mode servo board it simply broke the lock even if the gain seemed small enough. In addition to it, it became harder to lock approximately after 1:30 am probably due to some angular fluctuation in the arm cavity. I am too lazy to identify what optic is moving, but it is also clearly visible in the green ISCT1 CCD camera. Because of that, the IR locking doesn't stay more than 2 seconds -- the cavity build up in infrared drops extremely quickly due to the angular fluctuation.