The ROC and ITM substrate defocus estimator seems to be working correctly. The following two plots show the last 17 hours of (a) the XARM transmission and (b) the ROC of the four test masses as well as the single pass thermal lenses in the substrates of the two ITMs.

The estimator was engaged about 17 hours ago - which is when it first saw a signal from the ETM RHs and the ITMX CO2 laser. Hence, these ETM ROC is decreasing over time as the RH effect engages (also showing the classic RH overshoot after approximately 3 hours). Also the ITMX substrate lens starts from a static lens of around -1.2E-5 diopters and increases over around 4 hours to settle at it's nominal value.

Additionally, the IFO was being locked and unlocked. The six estimators show this transient behaviour as (a) ROC increasing during a lock and (b) ITM substrate defocus increasing during lock.

(all times in UTC)

Hand off from TJ with him aligning the SRC, but it looked off.  Sheila & I found that the SR3 was off in yaw (thru oplev trend & AS_C PD), so this was steered back, and then went through an SRC Alignment.  

Den:  tested out some MICH & BS filters to test DRMI acquisition

Then spent most of the evening trying to get H1 to NLN, but there are some ASC issues floating around.  

One cool thing is seeing DRMI locking super fast.  I noted some of the acquisition times here:

• 1:05:54 - 1:07:48---> under 2min
• 1:29:31 - 1:31:20--->1min49sec
• 2:56:48 - 2:59:48--->3min
• 3:17:45 - 3:18:11-->26 sec
• 3:34:08 - 3:34:38
• 3:38:25 - 3:39:38

o 0:32-1:05 Dave/Jim heading to EY to check seismometer

o 3:52 acknoweldged a GRB but we were locking.

Leaving Operating Mode in Locking as I leave H1 to Den for the evening.

I'm not sure why, but BS gets a large kick in Pit and Yaw just before it goes into the coil drivers state.  We've seen this 3 times in a row now, although these were the first times since ~lunch that the IFO was locked past DC readout.  So, it's perhaps related to our alignment / locking troubles, which are perhaps due to this LVEA temperature change that happened on Tuesday. 

The transient is visible in the LOCK_P and LOCK_Y channels for BS M3, but not in LOCK_L.  It is also visible in the WFS signals.

Had a couple of random HAM5 ISI/SRM_M1 watchdog trips.  For both watchdog trips, it looks like HAM5ISI is first.  The trips happened during two different states of working on H1.

1)  At end of TJs shift when there was a lockloss from DRMI.  The GS13s & Actuators both hit their limits.  NOTE:  on this one, SR3 was quite a bit off in yaw!

2)  While aligning H1, HAM5 tripped in a similar way.  NOTE:  No issue with SR3 here!

For both cases, all the M1 OSEM RMS values start increasing (not enough to trip the WD), but it's interesting to see them all ramp up.

For the first case, Sheila made a change to Guardian to make sure we look at when DRMI drops out of lock.  Still not really sure what caused case #2.

Received an FMCS Air Handler HIGH RED alarm.  This evening.  I've acknowledged it, and it will probably stay in the RED state until addressed (if this is a new running state, we should update the alarm handler).

This might be correlated with John turning off heaters on Tuesday, but not sure.

Will send an email to John/Bubba.

I reduced the gain of the OMC length locking loop by a factor of 3, the UGF has gone from 10 Hz to 3 Hz, and added a 30 Hz low pass.  The new open loop is attached, as well as a spectrum of the drive signal before and after this change.  There are low passes in the PZT driver that mean this is not as dramatic a change in the OMC length RMS as it seems.  

Noise projections coming soon.  

Sheila, Den

We have tuned DRMI servos to reduce the acquisition time. First of all, we noticed that MICH servo saturates the BS actuator during the flash. In order to solve this issue we have copied control filters from LLO. Attached plot shows comparison of LLO and old LHO MICH servos. Next we have changed locking threshold for SRCL and changed ramping time for PRCL and SRCL boosts.

New changes are in the guardian's "NEW_DRMI_SETTINGS" state. We tested these filters (~10 times) and concluded that there is an improvement in lock acquisition time. Average DRMI wait time is 1 minute.

[Cao, Ellie, Dave O, Aidan]

To whoever will be around in the control room last after commisioning, here are the steps for SR3 scanning to align Y arm HWS:

1- Turn off SR3 Cage Servo , Make sure that all mirrors are in ALIGNED state.

2- Run arbitrary waveform generator for H1:  SUS-SR3_M1_OPTICALIGN_P_EXC.

             Frequency has been set to 41.7 mHz

            Amplitude has been set to 750 urad

3- Run arbitrary waveform generator for H1:  SUS-SR3_M1_OPTICALIGN_Y_EXC immediately after step 2

            Frequency has been set to 10.3 mHz

            Amplitude has been set to 1550 urad

Let it run over night

All relevant windows have been left open on computer operator1 10.20.0.81

This afternoon, we replaced the Sat Amp units for TMSX. New units have the same modifications as the SR3/OMC units. Two decoupling capacitors were placed on the input of the negative regulator (U503), as implemented at LLO. 

C602 0.1uf
C601 10uf

New Unit S1100098 Old Unit S1100168
New Unit S1000292 Old Unit S1100066

• Title: 2/17 OWL Shift: 16:00-00:00UTC (08:00-16:00PDT), all times posted in UTC
  

• State of H1:
  

• Shift Summary: Pretty unsuccessful in terms of locking. Earthquake in the beginning of the shift, then bits of commissioning/fixing to help relock, but then CDS went to replace the sat amps for TMSX bringing us down for a bit more.

• Incoming Operator: Corey

• Activity Log:

• 15:10 Hugh into LVEA STS2A setup

• 16:35 Hugh into LVEA by bier garten

• 17:08 Chris, Nicole into EX for parts hunt

• 17:06 hugh out

• 17:24 Mitchel, film crew into LVEA and out a few various times until ~20:00 UTC

• 19:50 Vinny, Brin to EY for magnetometer work

• 21:02 Vinny, Brin back

• 23:35 Vinny, Brin To EY again

at 14:11 PST h1dc0 froze up with a kernel panic. We reset the computer by pressing the front panel RESET button, but it did not come back cleanly.

When h1dc0's daqd process first was restarted, it ran for only a short period and then died. It was logging GPS timing jumps of one to many seconds.

Monit restarted it and it is now running correctly. The other DAQ systems restarted at this time correctly, except h1broadcast0 took a long time to get going.

Frame gap due to this problem is

1139782208 to 1139782912

Feb 17 2016 22:09:51 UTC to Feb 17 2016 22:21:35 UTC

The TCS simulation model to estimate the lenses and ROC of the optics is now running. The following lists gives the nominal values and the transfer functions used for all the filters:

ITMX/ITMY:

• TR-X calibration: H1:TCS-ITMX_SIM_ARM_POWER_WATTS_PER_INPUT_UNIT = 1
• TR-Y calibration: H1:TCS-ITMY_SIM_ARM_POWER_WATTS_PER_INPUT_UNIT = 1
• Absorption: H1:TCS-ITMX_SIM_SURF_ABSORPTION = 250E-9
• Absorption: H1:TCS-ITMY_SIM_SURF_ABSORPTION = 250E-9
• Surface defocus:
  • ITMX ROC nominal: H1:TCS-ITMX_SIM_SURF_ROC_NOM = 1939.3m (see galaxy website ITM serial number 03)
  • ITMY ROC nominal: H1:TCS-ITMY_SIM_SURF_ROC_NOM = 1939.2m (see galaxy website ITM serial number 11)
  • ITMX/ITMY self absorption transfer function (derived from a COMSOL model and fitted to double-exponential in MATLAB):
    • poles = [1.195E-4, 9.1E-4],
    • zeros = [2.115E-4],
    • steady state gain, H1:TCS-ITMX_SIM_SURF_DEFOCUS_SELF_GAIN = -3.652E-5 diopters per Watt (-ve sign comes from the fact that self-absorption makes the surface flatter, or ROC longer)
  • ITMX/ITMY ring heater - electrical power to radiated power transfer function (15-minute time constant)
    • poles = [1.768E-4]
  • ITMX/ITMY ring heater transfer function (fitted from COMSOL - surfTFRH):
    • poles = [2.0693E-5, 2.4992E-5]
    • zeros = [8.8689E-6]
    • steady-state gain: H1:TCS-ITMX_SIM_SURF_DEFOCUS_RH_GAIN = +1.06626E-6 diopters per Watt (+ve sign comes from the fact that RH makes optic surface more curved), derived from Figure 4 in T1200465
• Substrate defocus:
  • ITMX/ITMY ring heater - electrical power to radiated power transfer function (15-minute time constant)
    • poles = [1.768E-4]
  • ITMX/ITMY ring heater thermal lens (single-pass): fitted to LLO measurements
    • poles: [3.908E-5, 6.385E-6]
    • zeros: [2.6983E-6]
    • steady-state gain: H1:TCS-ITMX_SIM_SUB_DEFOCUS_RH_GAIN = -9.0E-6 diopters per Watt (RH cause a -ve lens in the substrate)
  • ITMX/ITMY CO2 laser (single-pass): fitted to data in aLOG 14722
    • poles: [6.413E-4, 6.956E-5]
    • zeros: [1.24E-3]
    • steady-state gain: H1:TCS-ITMX_SIM_SUB_DEFOCUS_CO2_GAIN = +62.3E-6 diopters per Watt (see aLOG 14722)
  • ITMX/ITMY self-heating thermal lens: from COMSOL
    • poles: [5.0827E-4, 8.2714E-5]
    • zeros: [1.3062E-4]
    • steady-state gain: H1:TCS-ITMX_SIM_SUB_DEFOCUS_SELF_GAIN = +4.8709E-4 diopters per Watt (self heating lens is +ve in the substrate)

ETMX/ETMY:

• TR-X calibration: H1:TCS-ETMX_SIM_ARM_POWER_WATTS_PER_INPUT_UNIT = 1
• TR-Y calibration: H1:TCS-ETMY_SIM_ARM_POWER_WATTS_PER_INPUT_UNIT = 1
• Absorption: H1:TCS-ETMX_SIM_SURF_ABSORPTION = 250E-9
• Absorption: H1:TCS-ETMY_SIM_SURF_ABSORPTION = 250E-9
• Surface defocus:
  • ETMX ROC nominal: H1:TCS-ETMX_SIM_SURF_ROC_NOM = 2241.54m (see galaxy website ETM serial number 08)
  • ETMY ROC nominal: H1:TCS-ETMY_SIM_SURF_ROC_NOM = 2238.9m (see galaxy website ETM serial number 12)
  • ETMX/ETMY self absorption transfer function (derived from a COMSOL model and fitted to double-exponential in MATLAB):
    • poles = [1.033E-4, 7.5E-4],
    • zeros = [1.8511E-4],
    • steady state gain, H1:TCS-ETMX_SIM_SURF_DEFOCUS_SELF_GAIN = -2.931E-5 diopters per Watt (-ve sign comes from the fact that self-absorption makes the surface flatter, or ROC longer)
  • ETMX/ETMY ring heater - electrical power to radiated power transfer function (15-minute time constant)
    • poles = [1.768E-4]
  • ETMX/ETMY ring heater transfer function (fitted from COMSOL - surfTFRH):
    • poles = [2.0693E-5, 2.4992E-5]
    • zeros = [8.8689E-6]
  • • steady-state gain: H1:TCS-ETMX_SIM_SURF_DEFOCUS_RH_GAIN = +1.06626E-6 diopters per Watt (+ve sign comes from the fact that RH makes optic surface more curved), derived from Figure 4 in T1200465
• Substrate defocus:
  • ETMX/ETMY ring heater - electrical power to radiated power transfer function (15-minute time constant)
    • poles = [1.768E-4]
  • ETMX/ETMY ring heater thermal lens (single-pass): fitted to LLO measurements
    • poles: [3.908E-5, 6.385E-6]
    • zeros: [2.6983E-6]
    • steady-state gain: H1:TCS-ETMX_SIM_SUB_DEFOCUS_RH_GAIN = -9.0E-6 diopters per Watt (RH cause a -ve lens in the substrate)
  • ETMX/ETMY self-heating thermal lens: from COMSOL
    • poles: [4.1996E-4, 7.0555E-5]
    • zeros: [1.1155E-4]
    • steady-state gain: H1:TCS-ETMX_SIM_SUB_DEFOCUS_SELF_GAIN = +3.8577E-4 diopters per Watt (self heating lens is +ve in the substrate)

I filled the PSL diode chiller with 350ml of water.  Attached is a 30 day plot showing where the diode chilller was filled on Feb 4th, and then the alarm level increasing starting around Feb 13th.

I have increased the LLCV valve setting to 18% (from 15%) to try and compensate for changing conditions.

Factors that are changing are:

The supply pressure is falling as the liquid level in the storage dewar falls.

Heat leak to the liquid transfer line is increasing with outdoor temperature. This results in more vapor in the line and less liquid to the pump.

Radiation from the beam tube as the beam tube warms.

The attached plot shows 100 days of the control valve setting. The flat line at 15% is due to the failure of the differential pressure sensing- we have had to resort to manual setting of this valve.

Jeff, Darkhand, Kiwamu,

We have been meaning to do this, but kept missing a chance to do. Today we have fliiped the sign of the ESD bias voltage both on ETMX and ETMY.

This alog only describes what we did on the digital front end models. We will perform a set of confirmation measurement and verify the H1 DARM model later.

See alog 22135 for a concise summary of the bias flip.

[Bias flip on ETMY ]

• We flipped the bias request voltage from +9.5 => -9.5 in SUS-ETMY_L3_LOCK_INBIAS
• No other change required in SUS-ETMY because there is a if statement in ISC_LOCK which automatically checks the change in the bias sign and compensate for it by changing the sign of L3_DRIVEALIGN_L2L_GAIN.
• In CAL-CS, we have changed DARM_FE_ETMY_L3_DRIVEALIGN_L2L_GAIN from +30 to -30.
• Similarly, we have changed DARM_ANALOG_ETMY_L3_GAIN from -1 to + 1.

[Bias flip on ETMX]

• We flipped the bias request voltage from -9.5 to +9.5.
• We flipped DRIVEALIGN ellements as follows.
  • SUS-ETMX_L3_DRIVEALIGN_L2L_GAIN, from +1 to -1
  • SUS-ETMX_L3_DRIVEALIGN_L2P_GAIN from +0.021 to -0.021
  • SUS-ETMX_L3_DRIVEALIGN_L2Y_GAIN from 0.007 to - 0.007
• We changed the force coefficient of the linearization from -124518.4 to + 124518.4 in SUS-ETMX_L3_ESDOUTF_LIN_FORCE_COEFF
• All the the above changes are now written in ISC_LOCK with a if statement, so that it automatically checks the bias sign and apply a proper set of parameters.
• We have not updated CAL-CS for ETMX because it is currently not in use.