The first attachment is a time series of the HAM6 Watchdog, the Fastshutter State, and a GS-13 trace on HAM6.  The switch to low Gain is clear on this last trace.  This is a 5 day trend and the ~20 minutes needed to get the below .005Hz BW data is comfortably unmolested by the ISI or the fastshutter--the start times of the Spectra calculations begin at the vertical black lines.  As for ISI trips and shutter fires--there were none.

The High Gain Spectra period begins at 0800utc on 29 Jan, the Low Gain Spectra begins at 0800utc 1 Feb.

The second attached graph has Horizontal GS13s on HAM6 in High and Low Gain on the upper plot.  The Verticals are in the lower plot. High Gain Spectra is Dashed, Low Gain traces are Solid.  Also shown is our ADC noise in counts.

One caveat is that the ground motion is different at the two times.  The third attachment shows the Cartesian DOFs for the HAM6 GS-13s in the upper two plots and the ground noise in the bottom plot.  We've had a ground motion decrease in the microseism frequencies and below during the low gain period.  You can see the Low Gain Spectra are at the ADC level below 50mHz.  And the 10x signal reduction expected is more like 5x below these frequencies.  If this conclusion passes mustard, we'll have to revisit the GS13 triggering delays/levels.

DTT template is /ligo/svncommon/SeiSVN/seismic/Common/MatlabTools/HAM6_GS13_GainNoiseTest.xml

This morning, I worked on adding a few more suspensions to be monitored by the SDF, mostly to add progress on my SDF learning curve.  While we continue to work through a path which monitors filter channels more efficiently, I went ahead and set the SDF to monitor every channel that the guardian doesn't touch for the MC1, MC2, and MC3 suspensions.

While I was at it, I decided to set the SDF to also monitor every LSC and LSCAUX channel.  I did not set any channels in these snap files to be ignored by SDF.  However, when I hit the LOAD TABLE ONLY button, I noticed that there are currently 9 unmonitored channels in the SDF LSC monitor.  See attached below.  Huh??  When I look at the h1lsc_safe.snap file, I confirm that the last column is all 1s, no zeros (therefore no ignoring any channels in this file).

The LSC model has been edited to accommodate a normalized REFLAIR9I signal (LSC-TR_REFLAIR9) alongisde normalized REFL9I (LSC-TR_REFL9). A switch determines which of these is signals is fed into LSC-REFLBIAS.

Correspondingly, I have switched back the cabling on the ISC rack so that the demodulated REFL_A_RF9 signals feed into the REFL_A_RF9 whitening chassis, and likewise for REFLAIR_A_RF9.

Wanted to confirm the long runs to the amplified BSC2 Pressure Sensors weren't the main ground noise culprit.  Richard plans to add following resistors to the satellite amplifier before the long runs.

Anyway, it does not look like these are making the Pump Station Pressure signals noisy.

Attached is 30 minutes where we disconnected these channels from the servo inputs: Ch3 goes away as the return and supply pressures from BSC2 (Chs7 & 8) are disconnected. The Main Supply pressure, Ch9, shows that the noise level doesn't change during this period.  The servo is in free running manual mode.

model restarts logged for Sun 01/Feb/2015
2015_02_01 14:40 h1fw0
2015_02_01 20:06 h1fw0

both unexpected restarts. Conlog frequently changing channels report attached.

Evan, Sheila

We did a little bit of cleaning up today.  First edited the IMC guardian to adjust the input gain for different input powers.  We though we had implemented this before, but what we had actually wasn't working.  I added an if statement in the BOOST step that sets the input gain for 1W, 4W, or 10W.  We could have something better which adjusts it for any input power.  

We also changed the ISC_CONFIGs guardian to accoun for the cable swap we did on friday night, PRX locked is not using reflAIR in the input matrix, which is really REFL 9.  

Evan and I then locked DRMI just to make sure everything is OK with the TCS back on, it locked with no problem, now we are checking demod phases.  

Sheila, Evan

We have been changing the PSL power up and down during CARM offset reduction. Among other things, this changes the optical gain of the IMC PDH loop. So far, we've been compensating for this gain using the IMC servo board as follows:

• For 10 W of PSL power, the input gain on the IMC servo board is 0 dB.
• For 4 W of PSL power, we change the input gain to +6 dB.

Just to make sure that the IMC loop is still OK in the latter configuration, we took an OLTF by driving a 20 mV swept sine into EXC A and monitoring the test points before and after. The result is attached.

model restarts logged for Sat 31/Jan/2015
2015_01_31 06:40 h1fw0
2015_01_31 08:08 h1fw0
2015_01_31 18:39 h1fw0
2015_01_31 19:04 h1fw0

all unexpected restarts. Conlog frequently changing channels report attached.

Dan, Elli

Today we did a few non-locking things:

• Turned on the ISS second loop and measured the RIN at the dark port.  The measurement showed RIN@AS less than 10^-7 at 10Hz, I will post data on Monday after the Patriots crush the Seahawks.  The ISS second loop behaved very well, we left it on all day.
• Measured the Michelson contrast and turned on the ITMX CO2 laser.  Data to follow; before the laser was turned on the [Bright, Dark] counts were [38180, 51] on OMC REFL A, for a contrast of 1-(Bright-Dark)/(Bright+Dark) = 2668ppm (is this the right formula?).  After a few hours of heating we observed [38600, 39] or 2018ppm.
• Collected a 'before TCS' mode scan of the OMC with a single bounce beam from ITMX.  Plots showing the peak fitting and frequency fitting are attached.  The mode matching into the OMC was 0.893 (=1-TEM20/TEM00) without TCS.
• Diagonalized the AS WFS DC centering.
• Measured the OMCS --> OMC QPD transfer function and made some filters to smooth out the peaks of the OMC suspension.
• Measured the OMCS, OM3 --> OMC QPDs sensing matrix, inverted, and closed the OMC ASC loops.  The alignment in HAM6 is now nicely decoupled, WFS are centered using OM1 and OM2, the OMC is centered using OM3 and OMCS.  The loop gains are not too high or else the OMCS saturates.  Plots to follow.
• The OMC dither alignment did not work, with the improved intensity stabilization.  Need to investigate this further.
• Now that the fast shutter is installed we centered the beam on the OMC REFL QPDs and checked that it was coming out of the vacuum.

As part of this work we changed a few whitening gains.  The gain for IM4 TRANS had been turned down to zero because it was saturating from the aux laser for the Schnupp and PRCL measurements.  We turned this gain back to 36dB.

Also we increased the whitening gain on the OMC QPDs, they are now 30dB (were 18dB).

Turned on at 1Feb 2:55:22 UTC.  .3W requested power, 0.21W registered at the power meter. 

I requested central heating, although the H1:TCS-ITMX_CO2_FLIP2MON and H1:TCS-ITMX_CO2_FLIP1MON mon channels are jumping all over the place, we need to fix this.  ITMx HWS was runningand shows an increase in the spherical power, which is consistent with central heating.  

model restarts logged for Fri 30/Jan/2015
2015_01_30 04:45 h1fw0
2015_01_30 08:03 h1fw0
2015_01_30 11:02 h1fw0
2015_01_30 17:27 h1fw1

C1PLC1 7:54 1/30 2015

C1PLC2 7:54 1/30 2015

C1PLC3 7:54 1/30 2015

unexpected daq restarts. Beckhoff corner station restart for fast shutter install. Conlog frequently changing channels report attached.

Alexa, Elli, Sheila, Kiwamu, Rana, Evan

Summary

With CARM controlled by a combination of sqrt(TRX+TRY) and TR_REFL9 (i.e., REFL9I normalized by TRY), we've achieved a power buildup in each arm that is 800× the single-arm buildup. We believe this corresponds to a CARM detuning of 5 pm.

At this point, REFL_A_LF is at about 2.3 mW, compared to 40 mW when the arms are anti-resonant. If this is truly an indication of the power reflected back from the PRM, this means that the visibility of the interferometer is in excess of 90 %.  We do not have TCS on today.

One major roadblock to further progress seems to be angular instability that is seen at the AS port. We have ASC feedback from AS_B_45_Q to ETMX and ETMY, but the bandwidth is too low to suppress the 1 Hz motions that we see. We may need to spend some time increasing the WFS bandwidth, or resort to more aggressive oplev damping.

Details

A laundry list of things we've done today to troubleshoot the transition:

• Locking at 4 W input power. This appears to reduce the amount of angular instability during CARM offset reduction.
• Engaged oplev damping on ITMs.
• Increased the DHARD WFS BW. The gains are now 0.1, FM2 (+20dB) is no longer on compared to Elli's old alog (LHO#16345)
• Changed the DARM loop shape (LHO#16387) to achieve higher bandwidth.
• Switched from REFL_A to REFLAIR_A to avoid saturation while locking (LHO#16381).
• Because TCS was accidentally turned off (LHO#16385), we decided to retune the demod phases of the 3f signals. With CARM controlled by sqrt(TRX+TRY), we've adjusted the phases as follows:
  • 27 MHz: 91.3°→111.8°
  • 135 MHz: 65°→25°
• We took a TF from TR_REFL9 to sqrt(TR) at -25 ct of offset on sqrt(TR). Above 10 Hz, the TF was about 50 dB with -180° of phase. Below 10 Hz, the TF began to rise. Therefore, we installed a 1.6 Hz pole, 40 Hz zero in the TR_REFL9, and +50 dB. This behavior does not seem to correspond with simulated TFs given, e.g., in T1400298.

Based on the measured losses in the arms (an average of 110 ppm), we expect an interferometer recycling gain of 32 W/W and a coupled cavity pole of 0.6 Hz (i.e., 9 pm) [using eqs. 6 and 8 from Fritschel et al. 2001]. Therefore, we believe that the arm buildup should be about 1000× the single-arm power with CARM at 0 pm. This is consistent with earlier estimates made by others (LHO#15390, T1000294).

A list of transition steps not yet implemented in the guardian:

• Increase the gain of IN1 on the IMC board by 6 dB.
• Starting at a sqrt(TR) offset of −20 ct, ramp the offset to −30 ct while reducing the DARM gain in the input matrix from 40 ct/ct to 20 ct/ct.
• Turn off the WFS (they appear to flip sign around here).
• Ramp the offset to −36 ct, and ramp the DARM input matrix coefficient to 8 ct/ct. Turn on the WFS with the opposite sign, and 10 dB less gain.
• Turn on TR_REFL9I→CARM feedback with an input matrix gain of 3 ct/ct, and no TR_REFL9I offset.
• Adjust the CARM offset to -41 cts, and hold the TR_X/Y_NORM outputs

Our last three attempts are 11:24:48 UTC, 11:00:27 and 10:37:35 Jan 31.

J. Kissel, R. Adhikari, S. Dwyer,

By happenstance calling for another reason (see LHO aLOG 16390), Rana and Sheila informed me of woes at ETMX: a sudden trip, some further trip, followed by more trips of the watchdog. Unsure of what was going on, they had mashed a bunch of buttons in attempt to fix the problem. 

After some remote MEDM'ing, I could tell that the BRS-rotation-corrected, GND X STS signal had gone bonkers, which was being used as the X -direction Sensor Correction signal since Krishna had resurrected the BRS earlier this afternoon (see LHO aLOG 16380). 

I've since switched the STS2CART input matrix to use the normal X-direction STS signal for sensor correction (changed the STS2CART matrix to use STS B for X input to sensor correction instead of STS C). I'm not sure what's gone wrong with the BRS (too difficult to diagnose remotely), we'll figure that out later.

Further, Sheila and I used the SDF system to restore all of the button mashing they'd done. Now only the expected differences from "nominal" remain -- my switch of the STS2CART input matrix, and Krishna's turning on the outputs of the Rotation and Torque correction paths for the STS. Again, the latter no longer has any impact because this GND super sensor output is no longer being used. I second Hugh's love of the new SDF system!

(Elli, Richard, Dave, Rich, etc.)

Last Tuesday around 1pm the readback channels of the TCSX CO2 laser system went crazy. We tracked this to the AI/AA chassis which were not powered. Not clear why, but maybe the power connector fell off, when someone worked in the PEM rack? When the digital system goes down, the chiller doesn't get a temperature setpoint. It will then turn itself off with a fault. In turn the laser shuts off. With the power restored, it was possible to turn the chiller on, and then the laser. Both actions need to be done on the floor. The laser is now back in operation with the requested heating set to 0W. Once we leave we can set it back to 0.3 W. The mask is set to central heating, but the monitor for the annular mask is flaky.

In conclusion: The TCSX CO2  was probably off since last Tuesday 1pm.

Rana and Travis updated a newer version of the drift monitor and added it to the sitemap at LHO, and I made some further changes:

I have fixed bugs in the MEDM screen (/opt/rtcds/userapps/release/sus/common/medm/SUS_DRIFT_MONITOR.adl), and now the buttons for updating individual suspensions work again. LLO, if you svn update the MEDM screen, please be aware that instances of "H1" in the code will need to be changed to "L1" to prevent horrible, epic failure. 

I've added a set of dictionaries to the drift monitor update script (/opt/rtcds/userapps/release/sus/common/script/driftmon_update.py) that allow for setting fixed threshold values by editing the code itself (example below). The current values are somewhat arbitrary guesses, so they require tuning. The changes have been committed to svn, and the code should be LLO-friendly without any modification. 

Example: To set fixed thresholds, open driftmon_update.py, and scroll down until you find the following (at line 115 at the time of this post):

########## TUNE THRESHOLDS HERE ###########
# yellow thresholds = mean +- yellow_factor * BOUND value
# red thresholds = mean +- red_factor * BOUND value


yellow_factor = 1
red_factor = 2

BOUND_MC1 = {'P' : 50, 'V' : 10, 'Y' : 15}
BOUND_MC2 = {'P' : 50, 'V' : 10, 'Y' : 5}
BOUND_MC3 = {'P' : 50, 'V' : 15 , 'Y' : 20}
.
.
.
and so on.... and edit the values corresponding to the suspensions and degrees of freedom you wish you tune. For instance, with the code above, if the script updates MC1 pitch and sets, say, 10uRad as the nominal value, then the code above will make the yellow alarm trip at <-40uRad and >60uRad (mean +- 50uRad), and the red alarm trip at <-90uRad and >110uRad (mean +- 2*50uRad).

 

I updated the GUARD_OVERVIEW and the IM/TT medm screens to contain micro/mini Guardians for IM1, IM2, IM3, IM4, RM1, RM2, OM1, OM2, OM3. The scripts were already made available by Stuart Aston and Jameson Rollins at LLO see https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=15772 and also https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=15585. The Guardian Nodes were not yet created though so I had to create those and figure out that they also had to be started.

Currently RM1, RM2, OM1, OM2, OM3 do not have any offset.snap files saved to them in userapps/sus/h1/burtfiles/ (hence the red border on the Guardian Minis in the overview screen shot).

Attached are the before and after of the GUARD_OVERVIEW.adl screens along with the new HAUX and one of the new HSSS IM screens.