Matt, Stefan

In an attempt to find our missing power, we decided to look for a change in the light scattered from the TMs.  The general idea was to use the camera images normalized to the input power, and see if the scattered light changed or increased faster than the arm power.  (A change in scattering could indicate heating of the mirror surface by a small absorber which leads to deformation and increased scatter T1000154).  This is similar to the OL test done earlier.

To investiage this and avoid camera saturation issues, I made a script to grab images of the TMs at a variety of exposure times (mexp.py).  This script takes 5 snapshots of each TM with exposure times from 30 to 10000 (micro seconds?).  I ran it during several power-up sequences to get images at 2W, 10W, 20W, 40W and 50W (all in /ligo/data/camera).

The accompanying matlab code loads these images and uses them to make a high dynamic range image (HDR) for each TM at each power level (see attached PNG for 40W images, and attached mat file for 2W and 40W data).

The overall conclusion is that the scattered light scales with the arm power.  That is, there is no evidence of increased scatter loss at higher power.

(About the HDR image: these use a log-color scale.  The ITMY scatter seems to be much larger than other optics.  ITMX has a strange crecent shaped collection of scatters.  The ETMs look like the usual stary night, though ETMY could use some focus adjustment.)

Quick Summary: Commissioning. Carl's working on PI, Stefan's working on PUM and RF45, and Matt's making pretty pictures. The goal tonight was to make sure ITM PI damping works. We locked at 40W for couple of hours.

- Added PUM coild driver switching to state 3 for 4 test masses into LOWNOISE_ESD_ETMY (at the end). It seems to take the transient.

- Down state switches back to state 2.

- Moved the pdList and pdSqList for the RF45 modulation depth lowering to the lscparams file.

- Updated the DOWN state to reset the gains of the PDs in pdList and pdSqList.

Optical lever sum sees the large angle scattering from the test mass it looks at (see T1600085 for details, but note that the trans impedance and whitening gain in that document are not confirmed by measurements). This is a tiny thing compared with the power of the OL beam itself, but the scattered light is visible if you subtract the background OL beam.

I looked at the time series of OL SUM for four test masses together with MC-PWR_IN_OUT16, ASC-X_TR_B_SUM_OUT16 and ASC-Y_TR_B_SUM_OUT16 between Jul 12 23:35:44 and Jul 13 1:4:44 2016 UTC.

The first attachment is the (OL SUM -background)/TRX (or TRY), rescaled such that they are 1 at 10W. I cannot see any huge increase in large angle scatter as the IFO moves to 40W for any of the test masses.

The second attachment shows you just how the raw-ish data looks like, this is after removing the OL beam offset and taking into account the whitening gain and trans impedance. There's some difference between ITMs and ETMs but note that ITM OLs are about 5 or 6 times farther away from ITMs than ETM OLs are from ETMs.

I removed the 300 Hz and 600 Hz stopband filters in DARM, along with the 950 Hz low-pass filter.

I increased the gain from 840 ct/ct to 1400 ct/ct, giving a UGF of 55 Hz. This seems to have improved the gain peaking situation around 10 Hz (see attachment).

The new settings have been added to the guardian (in the EY transition state), but have not been tested. The calibration has not been updated.

repost, somehow the original was erased during edit testing

The DAQ test stand timing components which includes the timing fanout, IRIG-B, and the powered-up I/O chassis have been reprogrammed to a version of the firmware which eliminates flahsing of LEDs when the components are sync'ed.

The wind direction part of the anemometers still seems to not be reading correctly.
There was some discussion on the SEI call today that maybe it had started working, but a look at the DetChar page at
https://ldas-jobs.ligo-wa.caltech.edu/~detchar/summary/day/20160714/pem/wind/
shows good info for wind speed, but nothing sensible for wind direction.

I put some data into the SEI log about wind direction as seen at the Tri-cities airport. 
https://alog.ligo-la.caltech.edu/SEI/index.php?callRep=1035
The FAA and Jim agree that strong winds come from the southwest. 

Kiwamu, Stefan

Using the pr2spotmove script (see alog 28420), we moved the spot on PR2 in lock by almost 1 milimeter.

Conclusions:

- The carrier recycling gain desn't care about the PR2 spot positon.
- The POP beam from PR2 to the invacuum POP diode is fairly close to the edge of the visibility aperture. This might be an issue for LSC aux noise.

Details:

- To be able to explore the full range of motion, we had to switch back to the REFL B WFS for PRC2 / PR3 control. We BTW verified that this WFS also works at 40W (and during the power increase).
- With that, the move-limiting aperture is the path from PR2 to POP. We can move until the POP_A loses the beam. The pitch and yaw min/nominal/max values for PR3 alignment angles are
    Pitch value / delta:
     min: -302.95  / -4.6urad
     nom: -298.35 / 0urad
     max: -275.35 /  +23urad
    Yaw value / delta:
     min: 257.45 / -16urad
     nom: 273.45 / 0urad
     max: 281.45 / +8urad
  Notice how close to the edge we are in pitch - this could be a factor for PRCL/SRCL/MICH auxiliary length noise and scatter coupling. We have to revisit this in low-noise.

- The 27.6urad move in pitch (24urad in yaw) peak-to-peak move corresponds to 0.9mm (0.8 mm) for the PR2 spot position. Note though that for the beam in transmission of PR2 that corresponds to several spot sizes of motion. (The virtual beam waist behind PR2 is 114u, i.e. we moved the spot more than 7 beam waists. As a result the beam completly left the POPAIR camera view.)

Title:  07/15/2016, Day Shift 15:00 – 23:00 (08:00 – 16:00) All times in UTC (PT)
State of H1: IFO unlocked. Relocking not successful. Need to do initial alignment.   
Commissioning: IFO locked at DC_READOUT, 2.0W, Wind is a moderate breeze (13 – 18mph) and a corresponding bit of elevated X and Y seismic motion. 
Outgoing Operator:  None
 
Activity Log: All Times in UTC (PT)

15:00 (08:00) Start of shift
15:52 (08:52) Richard – Going to HAM6 to check if HV shutter is on
15:55 (08:55) Lockloss – Richard turned on HV shutter
16:22 (09:22) Keita & Travis – Going to End-Y to reset camera
16:57 (09:57) Kyle – Going to Mid-X to check on moving a vacuum pump
17:06 (10:06) Keita & Travis – Out of Mid-Y
17:10 (10:10) IOF locked at NOMINAL_LOW_NOISE 24.9W
17:15 (10:15) Lockloss – commissioning
17:45 (10:45) Kyle – Back from Mid-X
18:03 (11:03) Richard – Going into LVEA to work on HV shutter near HAM6
18:08 (11:08) Richard – Out of LVEA
18:39 (11:39) IFO locked at DC_READOUT 
18:54 (11:54) Lockloss – commissioning
19:14 (12:14) IFO locked at DC_READOUT
19:25 (12:25) Kyle – Going to Mid-Y to look for rigging
20:00 (13:00) Kyle – Back from Mid-Y
20:15 (13:15) Kyle – Going to Mid-X (WP #6000)
20:24 (13:24) Lockloss – commissioning
20:46 (13:46) IFO locked at DC_READOUT
20:49 (13:49) Betsy – Going to Mid-Y
21:16 (14:16) Lockloss – commissioning
21:36 (14:36) IFO locked at DC_READOUT
21:45 (14:45) Betsy – Back from Mid-Y
21:50 (14:50) Kyle – Back from Mid-Y
23:00 (16:00) Turn over to Nutsinee
 

End of Shift Summary:

Title: 07/15/2016, Day Shift 15:00 – 23:00 (08:00 – 16:00) All times in UTC (PT)
Support: Keita, Stefan, Kiwamu,        
Incoming Operator: Nutsinee 

Shift Detail Summary: IFO locked at DC_READOUT, at 2W. Locking went relative well today. Had the IFO to NOMINAL_LOW_NOISE at 24.9Ws. Commissioners working on system. Rode out a 5.1mag EQ with no problems noted in the IFO operation.  

Kyle, Gerardo 

Used overhead crane to move EH2600 vacuum pumps from the elevated BT slab to the VEA floor -> Had rearranged pallets of HEPI actuators yesterday so as to create floor space to position (1) ea. EDP200 and (3) ea. EH2600 vacuum pumps adjacent to each other and near the 480 and 208 power receptacles, chilled water connections and LN2 boil-off vapor line.  Now I will be able to run these pumps periodically which will extend there useful life while in storage.

1235 - 1255 hrs. local -> To and from Y-mid 

Opened exhaust check valve bypass valve, opened LLCV bypass valve 1/2 turn -> LN2 at exhaust in 1 minute -> Restored valve configuration to as found.  

Next CP3 overfill to be Monday, July 18th.  

While Sheila was exploring the input alignment my moving PR3 and letting the initial alignment follow the beam, I recorded the required drive vector for PR3, PR2 and IM4, in both pitch and yaw.

This combination of alignment sliders keeps the spot positions on PR3 and IM4 the same, but moves the spot on PR2 (and therefore somewhat on PRM).

The matrix to convert PR3 alignment slider counts into corresponding alignment slider counts of PR2 and IM4 is
pitPR3toPR2=-9.2;
yawPR3toPR2=+9.2;
pitPR3toIM4=56;
yawPR3toIM4=11;
 

The attached script continuosly reads PR3 slider values and updates PR2 and IM4 slider values, walking the beam on PR2 only.

The script still doesn't have the PRM matrix elements - we will have to addd this in DRMI or full lock.

=========================================================================

Also updated the script to include PRM. This was done in the PRM align state.

pitPR3toPR2=-9.2;
yawPR3toPR2=+9.2;
pitPR3toIM4=56;
yawPR3toIM4=11;
pitPR3toPRM=1.5;
yawPR3toPRM=2.2;
 

Note that this should work in-lock once the PRC1 pointing loop is off (despite the fact that PR3 is WFS controlled).

Last night I took a bunch of pictures using PCal EX and EY camera to check the large angle scattering at 20W.

This morning, while I was taking pictures while IFO was unlocked to capture images without 1064 light, EX worked fine but EY stopped working after 10 or 11 pictures. Camera control software stopped responding, I cannot trigger shutter, see the live view, see the camera settings, really nothing.

Rebooting the camera, the camera interface and h1pcaly multiple times didn't help.

The other day when verifying rack layout Filiberto felt like something was wrong.  Upon further reflection he came to me this morning thinking he saw the HV shutter drive off.  No readbacks on the lcd screen.  I went out on the floor this morning and sure enough the +-15VDC switch was in the off position.  I turned it on and knocked the IFO out of lock.  At this time I am not sure how long it has been off (will run Dataviewer on a channel.) or why but will investigate.  When we work on this chamber for vacuum reasons we switch off the High Voltage supply so no one should have shut this unit off.   Investigation will continue to see how long we have been running in this state.

The shot noise level from last night seems higher (worse) than the O1 level by 6%. Here is the spectrum:

You can see that the red trace (which is the one from the last night) is slightly higher than the (post-) O1 spectrum. The 6% increment was estimated by dividing the two spectra for frequencies above 1200 Hz and taking a median of it.

*track AAA: PSL
- fix FSS re-locking problem

*track A: missing RG gain:
- PR2 spot position during alignment
- Add digital camera of BS
- arm optics camera defocus & power monitor
- *** fix the 2x omega diodes for SB recycling gain readout
   - check broadband mod of 2w PDs (POB and AS)
   - new lens in front of POB_B

*track B: noise commissioning?
 - shot noise scaling?
  - check calibration
  - try for 50W stable. Serious trouble with PI?
  - pick operating point, then now-noise commissioning
  - reduce RF45
  - Aux length show exess noise - fix it!