Elli, Evan, Thomas, Kiwamu, Stefan

First we made sure we can still run on the 3f diodes with WFS on:
 - After reconnecting REFLAIR_B and removing the beam dump that worked without a hitch - same WFS gains as coded for DRMI.

Next we wanter to check the PRMI - first on SBs:
- We temporarily turned of the WFS and Kiwamu simply kicked out the SRM by misaligning it - the PRMI stayed locked.
- So we simply turned on all WFS with the same gains as DRMI (without the SRCL loops of course). They worked just fine.

Finally we locked the PRMI on the carrier.
- There we had to change the WFS gain for PRC1, PRC2 and MICH. Those 3 loops were then simply closed.
- We had to slightly lower the MICH_P gain, as we were developing an oscillation.
- Kiwamu will post a PRC recycling gain measurement form that data.

Bubba noticed this error while he was in the chiller yard -> I will investigate tomorrow in the daylight -> Air at CP1 LLCV feels dry still

Kyle, Gerardo 

Finished rough pumping Y-end -> Switched to turbo (backed by QDP80) -> local scroll backing pump has a relay issue that needs to get sorted before it can substituted for QDP80 pump

Kyle 

Began rough pumping X-end (blow down dewpoint -16C) -> Will finish roughing tomorrow and switch to turbo in the afternoon

If the commissioners could turn off all the sensor corrections when they are done tonight, it would be greatly appreciated as we continue to debug the HAM3 problems.  Jim has a scripts, Jim's log, to turn these all on or off.  I'll set this up ready on opsws1.  Additionally, we need to turn off the HAM3 HEPI Sensor correction which Jim's script does not address.  Please ramp down the H1:HPI-HAM3_SENSCOR_Z_FIR_GAIN to turn this off.  Thank ya much.

LVEA: Laser Hazard
Observation Bit: Commissioning  

09:10 Cris – Delivering garb to End-X
09:10 Karen – Cleaning in the LVEA
09:37 Gerardo – In LVEA doing viewport checks
09:37 Hugh & Mitch – To unlock HEPI at End-Y
09:47 Aaron – PEM cabling work between HAM2 and Beer Garden
09:50 Travis – Open the High Bay rollup door in LVEA to bring in equipment from the end stations
10:22 Hugh & Mitch – Back from End-Y -  HEPI is now unlocked
10:25 Bubba – Going to End-X to check on cleanrooms
10:51 Karen – Going to End-Y to check on garb and clean
11:10 Bubba – Shutdown cleanrooms at End-Y and turn on heaters
11:30 Karen – Finished at End-Y
12:37 King Soft Water on site to drop off parts
13:17 Aaron – Pulling OpLev cables in the LVEA
14:54 Robert S. – Delivering equipment to End-Y
15:40 Daniel – Transitioning both End-X and End-Y to laser hazard

Rich, Hugh, Fabrice:

Continuing the investigation to solve HAM3 noise issues. Last tests on Fridays doing the sensor correction to HEPI instead of ISI show that the noise line is still visible in the CPS, but not in the GS13. Rich suggested it might mean that the noise is introduced in the sensor correction channels (still disturbing Stage 0, but rejected by Stage 1 isolation). So we have looked at the coherence bewteen the FIR channels:

H1:ISI-HAM2_SENSCOR_GND_STS_X_FIR_IN1_DQ,

H1:ISI-HAM3_SENSCOR_GND_STS_X_FIR_IN1_DQ,

...

H1:ISI-HAM6_SENSCOR_GND_STS_X_FIR_IN1_DQ

for the X, Y and Z directions. 

The coherence from HAM2  to the other channels is shown in the plot attached. It is pretty bad in the Y direction, but we don't see the coherence droping at 0.6 Hz. Next step is to look at the output of the sensor correction filters (not sure whether they are in the DAQs, I might need someone on site to look at it)

Elli, Daniel, Evan

Summary

We tried adding a dc bias to the PSL EOM in order to reduce the RFAM, with little success.

Details

At the top of ISC R1, we inserted a minicircuits bias tee into the 9 MHz drive that goes to the PSL EOM. With a DMM, we measured the input impedance of the 9 MHz drive to be an open, and the input impedance of the analogous point in the 45 MHz drive was 70 Ω. We take this to mean that the 9 MHz drive goes directly to the EOM, with no intervening amplifier.

To see the effect of dc bias, we first hooked up the dc port of the tee to ISC-EXTRA_C_AS_AO_4, which is a slow DAC channel on the ISC rack. We applied ±10 V dc offset while watching the time series of REFL_A 9I&Q, but saw no obvious changes.

So instead, we hooked up the dc port of the tee to LSC-EXTRA_AO_2 (a fast channel) and drove it with a 32700 ct, 444 Hz sine wave. Then we looked for this excitation in spectra of REFL_A RF9I&Q.

• We found that the signal showed up mostly in Q, at 0.014 ct/rtHz,with a bandwidth of 0.187 Hz. This corresponds to 6.1×10⁻³ ct_rms.
• Using 4.7×10⁶ ct/W as the end-to-end calibration of the PD (measured by Kiwamu), this is 1.3×10⁻⁹ W_rms.
• The DC power was 81 mW_dc, according to the calibrated output of LSC-REFL_A_LF. Since our bias voltage is V_bias = 32700 ct ≈ 10 V, the effect of our excitation is (1.6×10⁻⁹ W_rms/W_dc) / V_bias.

Previously (LHO#15681), the RFAM level has been pegged at 1.1×10⁻³ W_rms/W_dc. That means that the fractional RFAM change that can be effected by this bias tee configuration appears to be something like 1×10⁻⁶ / V_bias, which is way too small to be practical.

J. Kissel

I've taken a full set of top-to-top transfer functions on H1 SUS ETMX to complete the quick assessment performed on Friday (LHO aLOG 15748) and confirm all is free and good after the recent optic cleaning (LHO aLOG 15744) and door re-install (LHO aLOG 15750). The chamber is still at air, but the doors are on, the ISI is damped, HEPI is floating and position controlled.

Results look great. 

The only thing of interest is that the 2nd pitch mode, previously reported to be a lower frequency than expected (see LHO aLOG 8822) remains low in frequency, and has not changed since the previous assessment. Again, we've controlled this suspension admirably, so no problems. Just one of life's mysteries that remains unsolved.

All data, and updated scripts have been committed to the repository (see below for details).

-----------------
Raw Data:
/ligo/svncommon/SusSVN/sus/trunk/QUAD/H1/ETMX/
SAGM0/Data/2014-12-22_1710_H1SUSETMX_M0_Mono_L_WhiteNoise.xml
SAGM0/Data/2014-12-22_1710_H1SUSETMX_M0_Mono_P_WhiteNoise.xml
SAGM0/Data/2014-12-22_1710_H1SUSETMX_M0_Mono_R_WhiteNoise.xml
SAGM0/Data/2014-12-22_1710_H1SUSETMX_M0_Mono_T_WhiteNoise.xml
SAGM0/Data/2014-12-22_1710_H1SUSETMX_M0_Mono_V_WhiteNoise.xml
SAGM0/Data/2014-12-22_1710_H1SUSETMX_M0_Mono_Y_WhiteNoise.xml
SAGR0/Data/2014-12-22_1720_H1SUSETMX_R0_L_WhiteNoise.xml
SAGR0/Data/2014-12-22_1720_H1SUSETMX_R0_P_WhiteNoise.xml
SAGR0/Data/2014-12-22_1720_H1SUSETMX_R0_R_WhiteNoise.xml
SAGR0/Data/2014-12-22_1720_H1SUSETMX_R0_T_WhiteNoise.xml
SAGR0/Data/2014-12-22_1720_H1SUSETMX_R0_V_WhiteNoise.xml
SAGR0/Data/2014-12-22_1720_H1SUSETMX_R0_Y_WhiteNoise.xml

Processed and saved .mat files of measurements:
SAGM0/Results/2014-12-22_1710_H1SUSETMX_M0_DTTTF.mat
SAGR0/Results/2014-12-22_1720_H1SUSETMX_R0_DTTTF.mat

Updated scripts:
/ligo/svncommon/SusSVN/sus/trunk/QUAD/Common/MatlabTools/
plotquad_dtttfs.m
plotallquad_tfs.m

PSL Status: 
SysStat: All Green, except VB program offline 
Output power: 33.0w  
Frontend Watch: Green
HPO Watch: Red

PMC:
Locked: 5 days, 14 hours, 35 minutes
Reflected power:    2.3w
Power Transmitted: 23.3w 
Total Power:       25.6w 

FSS:
Locked: 2 days, 15 hours, 58 minutes
Trans PD: 1.944v

ISS:
Diffracted power: 7.44%
Last saturation event: 2 days, 19 hours, 11 minutes  

Will run a couple DC tests to insure clearance.

broken by people starting to go into the LVEA.

Start:   2014/12/22/01:05
Stop:    2014/12/22/17:25
Duration:16h20min

We do see O(1%) power drifts, including a step arounbd 8:30am local - presumably due to human activity. We will chase down where this comes from.

Seismic : Working on ITM configurations
	  Need to take Safe.Snap of BSC1, BSC2, BSC3
	  Calibration of HEPI system pressures	

Suspensions: Clean up after ETM optics work

no restarts reported for both days. Conlog frequently changing channels reports attached.

Evan, Stefan

With the winds calming down again, we did some more SR3 alignment work:
- We noticed that for SCR1_Y AS B 36 I is still the best signal. It has
   - less "phase lag", presumably due to a reduced coupling to the BS. This allows us to do a high bandwith loop.
   - a small enough offset that servoing it to zero makes sense for reducing build-up fluctuations.
- Thus we closed the yaw loop with a UGF of 3.3Hz. Engaging it is in the Guardian.
- We tried to play the same game for the pitch loop, with less sucess.
   - all signals have some RF offset.
   - none of the signals seem to have low enough "phase lag" for a high BW loop. We should make sure this phase lag is not due to some broken whitening filter.
- Thus for now we left pitch in the configuration described in alog 15769.

Evan is now also updating the WFS relieve.

We will leave DRMI locked for the night.

(Doug C and Suresh D.)

    This afternoon we replaced the glitchy diode laser  (Sl. No. 193) in the BS optical lever with a repaired and thermally stabilised laser (Sl. No. 130-1) which was under observation in HAM3 oplev.     The attached plots show the improved performance due to the repairs and stabilisation.

Things to note:

1) Broadband noise injection into pitch has disappeared after swapping the lasers

2) Constant glitching and consequent broadband injection of noise into yaw signals has disappeared after swapping.

3) The RIN has dropped by an order of magnitude at all frequencies

4) The spectrum is stable and does not oscillate between stable and unstable regimes as the temperature in the LVEA changes due to the airconditioners.

Please note that the laser is still approaching a stable operating condition and is under observation for a futher 24 hrs.  However its performance over the past six hours is satisfactory.