For Maintenance, we took all HEPI's and ISI's to OFFLINE.

I requested OFFLINE for BSC1 but it stalled and did not go there.

Jim helped, and got it to go OFFLINE.

TJ and I looked into why this happened, and what happened, and here's the list of events:

ITMY BSC1, Request for OFFLINE at 15:13 did not execute:

- SEI_ITMY request for OFFLINE did not take it to OFFLINE

- ISI_ITMY_ST1 left in Managed by User on 7/23 (found in the log, Tj and Cheryl)

- ISI_ITMY_ST1 Managed by User prevents SEI_ITMY from taking it OFFLINE

- the fix was that Jim requested INIT on SEI_ITMY

- this changed ISI_ITMY_ST1 from managed by User to managed by SEI_ITMY

- HOWEVER, HEPI was in transition to OFFLINE, and the INIT request interrupted that and sent HEPI back to the previous state, ROBUST_ISOLATED

- This brought HEPI back up when we wanted it OFFLINE

- Jim requested INIT again

- Jim requested OFFLINE again

- these second INIT/OFFLINE requests allowed SEI_ITMY to bring HEPI and ST1 and ST2 to OFFLINE

My questions:

• do we always want Guardian to default to the previous state, as HEPI did when Guardian didn't recognize it's current state?  This feature is what sent HEPI back up to ROBUST_ISOLATED when we were trying to reach OFFLINE.
• today I saw that my request for OFFLINE on SEI_ITMY wasn't really able to take the system OFFLINE, so is this an anomaly or something we need to plan for, or is the default procedure to INIT a system, reseting everything to Managed by Guardian (SEI_ITMY in this case)?

- Jim, TJ, Cheryl

ITMx & ITMy HEPIs had counters up around ~400-500 counts, and were reset this morning.

I forgot to run the the PSL Checklist during my shift yesterday.  Today, I ran our PSLweekly script and here is the output.  There was model work recently/currently done on the PSL today, so this is why many items are ~10min old.

Items to note:
ISS Diffracted power is HIGH!

Laser Status:
SysStat is good
Front End power is 32.51W (should be around 30 W)
Frontend Watch is GREEN
HPO Watch is RED

PMC:
It has been locked 0.0 days, 0.0 hr 10.0 minutes (should be days/weeks)
Reflected power is 2.061Watts and PowerSum = 24.37Watts.

FSS:
It has been locked for 0.0 days 0.0 h and 10.0 min (should be days/weeks)
TPD[V] = 1.521V (min 0.9V)

ISS:
The diffracted power is around 14.4% (should be 5-9%)
Last saturation event was 0.0 days 0.0 hours and 10.0 minutes ago (should be days/weeks)

J. Kissel, C. Vorvick, B. Weaver, C. Gray

We've attempted to bring down the IFO in a controlled fashion via the Gaurdian at 7:58a PDT. Cheryl will post details of how this went -- rather unexpectedly -- later.

J. Kissel, B. Weaver

In getting ready for maintenance day, we've done the following to the SDF while the IFO was fully locked at 60+ [Mpc]: 
Accepted 
- new coil driver states (in COILOUTF, ESDOUTF, and BIO STATE REQUESTs) on ETMX, ETMY, SRM, MC2
- SR3 gain to be zero
- new DRIVEALIGN GAINs for off-diagonal elements on ETMX, ETMY, ITMX, ITMY
- A few new TRAMP times on BS
- New work done in CAL-CS DARM calibration filters (H1:CAL-CS_DARM_FE_ETMY_L2_LOCK_L [turning OFF FM6, turning ON FM7] and CAL-CS_DARM_ERR_GAIN [from 1.32 to 1.22])
- Change in 538.1 calibration line frequency (from 538.1 to 329.9 [Hz]) and associated EXC amplitude (from 2.4 to 1.0 [ct])
- In LSC model, accepted new TR_X/Y QPB SUM OFFSETS 
- ASC DHARD P TRAMP increase from 10 to 20 [sec]
- The output switches OMC M1 LOCK filters
     We *think* these should be ON, given the model change to support pushing these length and alignment control signals through the DRIVEALIGN matrix LHO aLOG 19714, but we don't think Sheila got to commissioning them.
- OMC-ASC_QPD_A_YAW_OFFSET (was -0.11 and saved as -0.15)
- PSL FSS COMON_GAIN appears to have been tuned on (LHO aLOG 19715) from 20.17544 to 20.7
- PSL-ISS_LOOP_STATE_REQUEST (was 0 -- which we think corresponds to the ISS OUTER LOOP being OFF -- to 32700 -- which we think corresponds to it being ON)
- FEC-93_DACDT_ENABLE (that's for the IOPISCEY model) DAC duotone signal being ON (turned on yesterday July 27).
- A ton of stuff in LSCAUX LOCKIN / DEMOD stuff that (we think) has to do with Kiwamu's calibration line cavity pole tracker (LHO aLOG 19852)

Reverted 
- New? work done changing the OMC DCPD to DRAM input matrix element (H1:LSC-ARM_INPUT_MTRX_RAMPING_1_1) from 0 to 13.3050658281 -- this should be controlled by gaurdian!
       - in fact, we tried to revert it, and some gaurdian is FORCING it back to the 13.3 number. So we'll leave this as is, but it sounds like we should eventually not monitor it
- MATCH gain on ISIHAM2 from 1.0 to 1.036
- PCAX and PCALY calibration lines had been turned OFF, so they will come back ON (534.7 [Hz] @ 19300 [ct] and 540.7 @ 9900 [ct] )

Things that had tiny differences that we used caput to force to a reasonable precicison:
- caput H1:IMC-WFS_GAIN 0.1
- caput H1:PSL-FSS_COMMON_GAIN 20.7


Saved and loaded new EPICs DB (to clear uninitiallized channels and/or channels not found) for 
- ASC (NOT INITIALIZED)
- OMC (NOT INITIALIZED)
- ODC MASTER (NOT FOUNDs and NOT INITIALIZED)
- SUS ITMX (NOT FOUNDs and NOT INITIALIZED)
- LSC (NOT FOUNDs)
- ISIETMX (NOT FOUNDs)
- ISIETMY (NOT FOUNDs)
- PEM EX and PEM EY (NOT FOUNDs)

pre-maintenance restarts. New PI models with associated DAQ restart.

model restarts logged for Mon 27/Jul/2015
2015_07_27 16:05 h1susetmxpi
2015_07_27 16:09 h1susetmxpi
2015_07_27 16:20 h1susetmxpi
2015_07_27 16:23 h1susetmxpi
2015_07_27 16:48 h1susetmxpi
2015_07_27 16:50 h1susetmypi
2015_07_27 16:51 h1susetmypi
2015_07_27 16:56 h1broadcast0
2015_07_27 16:56 h1dc0
2015_07_27 16:56 h1fw0
2015_07_27 16:56 h1fw1
2015_07_27 16:56 h1nds0
2015_07_27 16:56 h1nds1

• Coil drivers all in low noise state.  Now all suspensions will be in their low noise state once the guardian has completed.
• We tried turning off ITM opLev damping, which eventually caused an alignment instability. 
• SR3 OpLev damping has been off all day, but we seem to be stable at high power without it. 
• We tried reducing the ETMY ESD bias by 33%, and increased the gain in drivealign.  
• Hang did some A2L tuning, and saw that the coefficients had changed. 
• Matt and I looked at Kiwamu's calibration line, and used an rms monitor of it to try to adjust the OMC QPD offsets to maximise the optical gain.  We changed the offsets slightly, but we were mostly only able to decrease the optical gain.  We noticed that the optical gain is moduated by some low frequency (microseism).  The seismic noise has been verry low.  
• There is some MICH coherence between 40-80Hz, we can revisit MICH FF tomorrow. 
• We measured CHARD PIT A2L, we would project that this is a factor of 2 below DARM at 20 Hz, and a factor of 5 below at 50 Hz.  This was with the low pass off, before Stefan's work.
• PI monitor is running for the Y arm.
• Evan updated some calibration, alog on the way tomorow. 
• Evan did not hit load on all the unmodified filters in various models, since the IFO is locked.  
• Intent bit is undisturbed.

None of these things changed the DARM noise.  (just the calibration)

Took ASC_CHARD_P FM1 (20dB gain) out from guardian, and instead turned on FM9 in ASC_CHARD_P and ASC_CHARD_Y (LP9 - a low pass at 9Hz).

Also added 25Hz-40Hz band stop filters to FM9 of ASC_DHARD_P and ASC_DHARD_Y (called Ncheck). These can safely be engaged in full lock, but they are not in guardian for now.

Following alog 19856 we took the same coherence measurements (OMC_DCPDs vs AS_C_LF vs AS_A_RF36) in different configurations.

a)  Plot 1: we locked the OMC on a 45MHz SB at 15W of input power (to avoid PD saturation). In this configuration we retook the coherence measurement between AS_C_LF and OMC_DC, as well as AS_A_RF36 and OMC_DC. (Also, the ISS was off in this state)
 - While we see coherence above 2Hz - similar to that in alog 19856 - nothing is visible below that.
 - In the power spectrum of the side band we can identify two features:
   - At 19032Hz we see the effect of the sideband 00 mode going through arm resonance
     (actually, we are seeing the peak in between where the lower and upper audio sideband goes through resonance - resulting in maximum FM to AM conversion in between)
   - Similarly, at 9700Hz we see the feature that corresponds to the sideband 02 mode going through resonance.
     This might we a way to fine-tweak the PRC to ARM mode-matching when we do common CO2 heating runs.

b) Plot 2: comparing ISS_SECONDLOOP_GAIN at 25dB (dashed coherence) vs 0dB (solid coherence)
 - The 14kHz gain peaking of the ISS clearly shows up, but below ~8kHz there is no obvious change
 - for 25dB we estimate the UGF to be at 3kHz
 - for  0dB we estimate the UGF to be around a few 100Hz.

c) Plot 3: comparing FSS_COMMON_GAIN at 20.7dB vs 14.7dB
 - I do not see any difference in the coherence.

Will monitor hourly -> CP8's LLCV will likely increase from its current value of ~ 50% open to something higher -> won't need to fix until tomorrow as long as CP8's level stays out of alarm -> otherwise will

Today's

• 8:05-9:10am:  Ed adjusted the PSL ISS_REFSIGNAL (made more negative) to lower the AOM Voltage & started H1 locking
• Gerardo put in 350mL in the top chiller YESTERDAY because it was alarming  (he noted last  fill was 7/11!).
• 9:15 Leonid starting ETM Charge Measurements
• 9:15-9:45:  Evan performing CARM transfer functions
• 9:30-9:45:  Betsy walking thru LVEA
• 9:59:  ALS DIFF PLL Open Loop Gain measurement (Jenne, Jeff)
• 11:00:  Matt & Sudarshan working on ISS
• 11:29:  Vinny tapping on seismometer at MY
• 12:34pm:  Monthly Hanford Alert phone call received
• 1:30:  Ed ran an Initial Alignment, & took H1 up to DARM Offset for the Commissioners.
• 2:20:  YMCA tour in Control Room
• 2:55:  Earthquake taking down for atleast an hour (Mag 7 in Indonesia area)
• 3:53:  Parametric Instability model test by Barker (since we are riding through an earthquake.
• 4:06:  Hit Master "Load Coefficients" for PRM, ITMy, & ETMy per Betsy's request to clean up the Front End Filter Module/DAQ Loading Time Stamps.  This also needs to be done for h1asc, h1ascimc, h1lsc, h1lscaux, h1omc, h1suspr3, h1sussr3, but Evan will load these piecemeal over the night just so they can check for any problems after each loading.
• Dr. Kissel has been planning out the attack for tomorrow's Maintenance Day

Sudarshan, Kiwamu,

As planned, we disabled the two pcal lines at around 550 Hz this evening (i.e. 534.7 and 540.7 Hz, see alog 19272) which brought some saturation issue the other day (alog 19891). From now on, we will have to use the 325.1 and 331.9 Hz lines (alog 19823) for calibration for the  high frequency part.

Also, we moved the suspension line from 538.1 Hz (alog 19926) to 329.9 Hz so that it is close to the new Pcal lines at around 330 Hz. We chose this frequency based on a prime number, 3299. This frequency should be also good in terms of the continueous wave search according to Jeff's alog 14836.

We tested the new suspension line in full lock, with DARM actuating on ETMY with a low pass ESD filter engaged. As we kind of expected, the suspension line used up a good fraction of the total rms in ESD DAC counts. We decreased the line amplitude by more than a factor of two, which resulted in 1x10⁴ counts in the ESD DAC as of now. This is sort of OK, but commissioners can feel free to disable it if necessary. The attached shows a spectrum of the ESD DAC when it was fully locked with the low pass engaged on ETMY and with the new suspension line injected. As seen in the spectrum, the suspension line is a dominant rms source when the low-pass is engaged. Also a screenshot of the new setting for the suspension line is attached.

Joe, Matt, Sheila, Dave:

We have used Joe B's latest PI_MASTER file to build h1susetmxpi and h1susetmypi. The master puts the DEMOD I,Q channels into the commissioning frame at 2kHz. If we try to run this model, we get the "DAQ too small" error. Rolf says that channels must be added to the DAQ at the native rate (64kHz) to remove this error. We put in two fast channels on the top level (we tried with one, but it looks like there must be at least two). To reduce these channels impact on the commissioning frame, I made these testpoint parts with an input of ZERO, which should be effectively removed by compression.

Matt and Sheila requested that the data rate for the DEMOD be increased from 2kHz to 4kHz, this was done.

After the models were restarted, the DAQ was restarted. h1dc0 did not autostart its daqd process, we had to do this by hand.

Per ECR E1500322, I've added the Wiener filter sensor correction path to the BSC and HAM ISI master models. Pretty simple change (even if it took ~3 hours to do), as there were already terminated STS paths on both models that just needed connection to a bus and a few filter blocks needed to be added to the Senscor paths. I've commit the changes to the SVN and checked to that HAM2 and ITMX would "make" on the new models. We should be able to install and use on all chambers tomorrow, the MEDMs should be pretty easy, too.

I happened to witness the lock loss after 16h. We had several PRM saturations spread over ~8 minutes, before one of them took down the interferometer.

Stefan, Evan

Summary

We temporarily switched back to the IFR as a sideband generation source, and then used it to drive the sidebands in frequency and amplitude. Then we looked at the coupling in OMC DCPD sum.

Details

We ran the spare LSC DAC channel (LSC-EXTRA_AO_2) into ISC patch cable R1 #11-4, which goes to ISC C4 #2-4. Then we sent this into the IFR's external modulation input.

First, we did the amplitude measurement. The IFR was set to dc-coupled AM with a nominal deviation of 10%. We drove 25 mV out of the DAC and watched the response in the OMC DCPD sum. The observed AM coupling is roughly flat from 300 Hz to 5 kHz, with a level of about 0.01 mA/RIN.

Next, we did the phase measurement. The IFR was set to dc-coupled FM with a nominal deviation of 1 Hz. We drove 100 mV out of the DAC and watched the response in the OMC DCPD sum. The observed FM coupling is roughly flat from from 300 Hz to 5 kHz, with a level of about 2×10⁻⁵ mA/Hz.

[An aside about the IFR actuation calibration: The IFR is designed so that in order to get 10% peak RIN, you must supply 1 V rms at the modulation port, which 1.41 V peak. Stupid stupid stupid. Anyway, I verified with an oscilloscope that the actuation coefficient was 0.068 RIN/V, which is close enough to the expected 0.071 RIN/V.

The same nuttiness applies to the frequency calibration: to get 10 Hz peak deviation, you must supply 1.41 V peak. However, Stefan and I measured this coefficient and found that it is really 3 Hz/V rather than 7.1 Hz/V. Measurement as follows:

• We beat the IFR and the OXCO against each other and looked at the mixed, low-passed output on a scope
• We adjusted the IFR frequency to match the OXCO as best we could.
• We applied 5 V dc from the DAC channel to the external input of the IFR, and measured the beat frequency (it was 14.8 Hz). This gives the acutation coefficient as 3.0 Hz/V.]