State of H1: locked in Nominal Low Noise

Activities:

• Kyle to MY and back
• Christina to EY (outside) and back
• Gabriele worked on alignment during the mid-day lock 

H1 locking:  all changes / issues resolved or being worked on

• REFL WFS have remained on
• after lock loss, some alignment was needed for the arms, BS, PRM, and SRM
• POP Offsets remain good
• Jenne - working on automating the CSOFT loop offset
• Tara - working on PI mode 26 that again did the hopping thing

In brief, no success. In details, here are some alignment tweaks trief over the last couple of days:

• moving SRM in pitch reduces the jitter peaks at 200-400 Hz, at the price of worse sideband powers
• moving IMC DOF_1_P (offset of +400) reduces a lot the peaks, but a the price of decreasing the IMC transmission. SRM had to be moved to keep reasonable sideband buildup
• moivng MICH both in pitch and yaw had not clear effect
• going to the best CSOFT offsets that Jenne found helps a bit.

The decrease of range in the last lock was due to a misalignment of the SRM.

J. Kissel

Though we turned off the 1083.7 Hz calibration line last night (LHO aLOG 30476) because we were worried about range in the PCAL systems Optical Follower Servo (OFS) after increasing other calibration line amplitudes. However, as a quick test, I turned it back on. With the increased amplitude of other CAL lines, and this 1083.7 Hz line ON, the OFS does not saturate, so it appears we have enough range to run it all. I've also made a quick check of the calibration line harmonics to be sure those are not huge, and still well below the DARM sensitivity, and they are. Nice!

We want this line ON, so it serves as a clean reference for the optical gain while we perform the high frequency, long duration sweeps (i.e. LHO aLOG 30434).

I've accepted the change in the SDF system.

issues getting here:

• REFL WFS centering not coming on in Inital alignment for PRC and SRC, so in both cases those didn't complete until engaged by hand (guardian?)
• alignment
• POPA OFFSETS - Evan looks at these - not sure they're OK but in the end they seem to work
• ASC - Evan toggled PRC1_P on and off (3 seconds each) to save the lock and also allow PRC1 P to converge 
• POPA sum got noisy in ENGAGE SOFT LOOPS until I engaged the CHARD offset of 0.1 by hand in Engage Soft Loops, then the signal improved
• I set the ramp to 120 seconds, and at 120 seconds there's a kick that can be seen on CSOFT_P
• PI mode 2 rang up - easily damped
• PI mode 26 rang up and did a bouncing thing until I lowered the gain by half from -5000 to -2500, and then tuned the phase

Using the crystal chiller that is currently sitting in the mechanical room, the on/off flow rate
was recorded as a function of time.  The data is that reported via the RS-232 interface.  When
switched off, the flow rate drops to zero in 3.245 seconds.  This seems a lot slower than the
drop reported by EPICS, which seems to suggest the flow rate drops to zero in less than a second.

I'd like to go from PRMI to Lock DRMI 1F.

Locking issues this morning.

• could lock in green but not IR
• doing an alignment
• in Initial Alignment, REFL WFS centering is not coming on when it needs to, so PRM align and SRC align
• looks like a guardian issue, but haven't had time to look into it

Images attached show the filter banks that aren't being engaged, and where to find them on the ASC page (DC centering)

As expected, the jitter feed forward that was tuned yesterday evening was no more good. Using the same method described before, I retuned it and found comparable performances as yesterday.

Addition:

The second plot shows how the coherence between DARM and DBB Q1Y changed over time. Initially there was no feed forward, then it was switched on at about t=1 hour. At t=8 hours I retuned it as explained above. Beware that the coherence color scale tops at 0.6 and not at 1. It looks like the subtraction was getting worse, but not too bad after all.

TITLE: 10/13 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC

• Locked for 08:27. The BNS range seems to have steadily trended down despite the H1IFO_Range reading between 59 and 64MPc pretty consistently.
• PI was quiet all night.
• Intention bit set to Commissioning at 14:58 at Gabrieles request. 
• Dust monitors in the LVEA and the Ends were set to class 1000 alarm limits to eliminate the constant nagging.
• Handing of to Cheryl

• Locked at NLN 63.5MPc. Everything is stable. Intention bit is set
• mSei is up to 90%ile after an upward trend following what was described to me as some kind of explosion somewhere. EQ bands have also trended upwards to roughly .03uum/sec. Winds are calm.
• the Only saturation was EY over 2 hours ago.
• also, ongoing 300NM dust alarms sitewide

09:29:10 Intent Bit set to Observe 

J. Kissel, D. Tuyenbayev,

We turned on two calibration lines using ETMY coil drivers on stages L1 and L2. The SNRs of these lines are roughtly 1/3 of the regular calibration lines (regular cal. lines have SNR of ~100 with 10s FFT).

                              _FREQ (Hz)  _CLKGAIN (ct)
H1:SUS-ETMY_L1_CAL_LINE          33.7             60.0     O2-scheme synched oscillator for kappa_U
H1:SUS-ETMY_L2_CAL_LINE          34.7             27.0     O2-scheme synched oscillator for kappa_P

These lines will be used to better quantify calibration of the PUM and UIM actuators.

A related report: LHO alog 29291.

Evan, Daniel

17:12:30 UTC Oct 7 2016:

• RF modulation off for 9 and 45 MHz
• 45 dB whitening gain compensated by a filter gain of 0.0056
• 1 stage of whitening, compensated
• V/ct filter engaged, referred to TNC ouptut of 2-chn demod board
• Dark

17:16:30 UTC Oct 7 2016:

• same input configuration
• 29 mA of photocurrent

17:18:30 UTC Oct 7 2016:

• turn DC centering of REFL WFS on

17:24:30 UTC Oct 7 2016:

• turn DC centering off again
• 14.8 mA of photocurrent

17:32:00 UTC Oct 7 2016:

• 9 MHz modulation on
• 14.8 mA of photocurrent
• DC values: 9I = 3.7 mV; 9Q = 9.5mV

17:34:30 UTC Oct 7 2016:

• 9 MHz modulation on
• 29 mA of photocurrent
• DC values: 9I = +7.2 mV; 9Q = +18.1mV

18:06:30 UTC Oct 7 2016:

• 9 MHz and 45 MHz modulation on
• 29 mA of photocurrent
• DC values: 45I = –14.3 mV; 45Q = +62 mV