In order to see if a couple of optics for HWSY could be identified, the illuminator cover on the
A1F4 viewport of HAM4 was removed.

Conclusion The optic in the HWSY DCBS1 lens mount is most likely to be a dichroic beamsplitter
rather than a lens.

  The orientation of the HWSY VacLens mount is such that the retaining ring is facing the HWS table.
Clearly seen are the two holes of the retaining ring as Betsy illuminated the chamber from A1F4.  The
holes are not clearly visible when one looks from the A1F4 flange side, which is consistent with them
being partly blocked by the lens mount.

  The 2" Siskiyou lens mount is 0.50" thick but has a 0.41" deep recess to accommodate an optic.  The
retaining ring for the mount is 0.13" thick.  If the optic in the mount is the dichroic beamsplitter
(D1200214) which is 0.375" thick.  Since the stack up
of the retaining ring and a 3/8" thick optic is thicker than the mount, the mount is a custom
modification to the standard part.  More importantly since the retaining ring appears to be almost
flush with the surface of the lens mount, the optic held is more likely to be the dichroic beamsplitter
rather than a lens.  The data sheet for a PLCX-50.8-360.6 lens says it is 6.4 mm thick - a concave lens
would be similar.  If the optic in the mount were a lens, the retaining ring would sit deeper in the mount.









Betsy / Peter

Earlier this evening when I was checking doors/lights, I noticed that the PSL Crystal Chiller was below the mid-level.  I topped it off with 275mL.

• 7:39 Lockloss:  No obvious reason
  • ALSx gave a little grief ranging from VCO/PDH messages flashing to breaking lock when WFS engaged.  Taking Guardian to DOWN might have helped to get hobble through.  Also notice lots of motion for ALSx after locklosses.
  • Had about (3) locklosses in FIND_IR after it had "found IR".
  • BS was way off, so had to CHECK MICH FRINGES & tweak at PRMI.
• 8:21 OBSERVING, still see light on ALSx camera as Patrick noted.

TITLE: 04/19 Owl Shift: 07:00-15:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Observing at 64Mpc
OUTGOING OPERATOR: Patrick
CURRENT ENVIRONMENT:
    Wind: 8mph Gusts, 6mph 5min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.14 μm/s
QUICK SUMMARY:

I'm in for Emergency Coverage (Sick Operator) For Owl Shift Tonight.  Patrick handing over a nice H1 amongst a seismically quiet night.

TITLE: 04/19 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 65Mpc
INCOMING OPERATOR: Ed (Corey covering)
SHIFT SUMMARY: Some issues staying locked before DRMI, not certain of cause. I think the lock loss shortly after the first transition to observing occurred after the small spike in 0.03 - 0.1 Hz CS seismic BLRMS was already coming down. No issues since last lock ~6 hours ago.
LOG:

23:18 UTC Clicked run on RF noise DTT
23:41 UTC Stopped at DC_READOUT_TRANSITION. Sheila commissioning.
23:45 UTC Restarted DMT range integrand
23:59 UTC Sheila done. Continuing to NLN.
00:11 UTC Observing. Small spike in CS 0.03 - 0.1 Hz seismic BLRMS < .1 um/s. High bounce/roll mode (~ 9 Hz)
00:13 UTC Lock loss.
01:01 UTC Observing. High bounce/roll mode (~9 Hz)
03:30 UTC LLO down. Out of observing to run a2l.
03:45 UTC Back to observing.

If I recall correctly this image (attached) is normally dark in NLN?

Back in observing. Greg reported the calibration code is working. Locked for ~2 hours. Wind is coming back down.

The H1 detchar summary page for 4/19/2017 shows the DMT GDS hoft calibration code has marked the calibration and hoft as OK when we went back into observing mode:

https://ldas-jobs.ligo-wa.caltech.edu/~detchar/summary/day/20170419/plots/H1-MULTI_D80927_SEGMENTS-1176595218-86400.png

This shows the calibration code (calibration 1.1.5) is behaving correctly for now.

(The bug reported here, https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=35569, should only occur if channels needed by the calibration reports bad dataValid flags or the DAC/framebroadcaster gets restarted.)

Peter, Nutsinee

HWSX

Today we started off by making sure that the green beam is aligned to the irises. We quickly found that the outgoing path of the sled beam and the green beam didn't quite overlap. We adjusted HWSX BS and HWSX SOURCE M2 optics to realign sled beam to the irises. After we ensure that the sled and green overlap we centered the HWS beam onto the HWS camera and adjusted the pick off BS to align the green to the BASLER camera (Richard insisted it's not a GigE so I'm going to stop calling it that). We also mount the camera to the height-adjustable mount. We also put the IR bandpass filter onto the camera and verified that the camera can actually see the 790nm sled by putting it right in front of the sled launcher. Right now we can't see the sled on the BASLER camera and we couldn't change the exposure rate (as of now anyway). We need something more sensitive (a flipper mirror alone wouldn't work either since the camera wasn't able to see any light coming off the final mirror before the HWS camera). 

HWSY

We wanted to see some HWSY data so we went in to make sure that Y sled was not clipped or whatsoever. The beam looked as bad as usual. We made some minor tweak to the green beam and the sled so that their path overlap. We also identified the top beam to be a beam reflected off the compensation plate (to figure this out we yawed the CP then put it back in place). Since we have only one spare sled left, we decided not to replace it until after the vent work.

HWS Code

Starting from 22:00:21 UTC today (April 18) the code is writing data from HWSY camera. Will revert this configuration as soon as I get some power up/down time.

WP 6584

Pulled new cabling for temperature sensors from the mechanical room into the LVEA. Runs in the LVEA are to the following chambers: HAM2, HAM3, HAM4, HAM5, BSC1, and BSC3. Work required climbing on chambers HAM4 and HAM5. This work is part of the HVAC upgrade being done by Apollo. 

Did not get to finish the HAM2 cable run. It is currently sitting next to HAM3. Will complete work next maintenance period.

Filiberto Clara

TITLE: 04/18 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: Nutsinee
CURRENT ENVIRONMENT:
    Wind: 24mph Gusts, 20mph 5min avg
    Primary useism: 0.16 μm/s
    Secondary useism: 0.16 μm/s 
QUICK SUMMARY:

Nutsinee has been attempting to relock.

TITLE: 04/18 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC

STATE of H1: Lock Acquisition

INCOMING OPERATOR: Patrick

SHIFT SUMMARY: Not much activities after I took over from Cheryl. Locked at NLN briefly but lost it. Possibly due to wind (now passed 30 mph).

LOG:

19:30 Robert & Evan to End Stations -- turn off PCal camera.

20:20 Fil & Marc out (cable pulling work)

20:36 Robert & Evan back

20:53 Robert to LVEA -- align MC3 camera

20:54 Dave back

21:01 Jenne et al. to ISCT1 to place beam dump.

22:14 Robert done sweeping the LVEA

Evan G., Robert S.

Looking back at Keith R.'s aLOGs documenting a changes happening on March 14 (see 35146, 35274, and 35328), we found that one cause seems to be the shuttering of the OpLev lasers on March 14. Right around this time, 17:00 UTC on March 14 at EY and 16:07 UTC at EX, there is an increase in line activity.

The correlated cause is Travis' visit to the end station to take images of the Pcal spot positions. The images are taken using the Pcal camera system and needs the OpLevs to be shuttered so that a clean image can be taken without the light contamination. We spoke with Travis and he explained that he disconnected the USB interface between the DSLR and the ethernet adapter, and used a laptop to directly take images. Around this time, the lines seem to get worse in the magnetometer channels (see, for example, the plots attached to Keith's aLOG 35328).

After establishing this connection, we went to the end stations to turn off the ethernet adapters for the Pcal cameras (the cameras are blocked anyway, so this active connection is not needed). I made some magnetometer spectra before and after this change (see attached). This shows that a number of lines in the magnetometers are reduced or are now down in the noise.

Hopefully this will mitigate some of the recent reports of combs in h(t). 

We also performed a short test turning off another ethernet adapter for the H1 illuminator and PD. This was turned off at 20:05:16 18/04/2014 UTC and turned back on at 20:09:56 UTC. I'll post another aLOG with this investigation as well.

The bi-monthly End X PCal calibration was performed today.  Results can be seen at https://dcc.ligo.org/T1500129.  Force coefficient for TxPD is 0.02% from its mean value and force coefficient for RxPD is 0.2% from its mean value.

[Jenne, Vaishali, Karl]

We have replaced the razor beam dump on ISCT1 that was causing scattered light problems (see alog 35538) with an Arai-style black glass dump, provided by the 40m (see 40m log 8089, first style). You can see the new dump just to the left of the PD in the attached photo.  I was thinking about sending the reflection from this dump (after several black glass bounces) to the razor dump, but I can't see any reflection with just a card, so skipped this step for now.  We can come back to it with an IR viewer if we have more time in the future.

We're on our way to NLN, so maybe we'll see if this helps any, if we happen to get high ground motion sometime.

Jeff K, Jonathan,  Dave:

h1calcs was restarted with new code at 10:15 PDT. Jonathan and I took the opportunity to update the H1EDCU_RACCESS.ini file with missing channels, and then restarted the DAQ.

ascii file saved on desktop folder of RGA machine in control room

Completed WP 6579 and then some.

• Ran Kobelco purge air unit (DP measured -43.7degC)
• Ran QDP80 (#2) roughing pump
• Spun up turbos on X & Y beam manifolds successfully & swapped out battery packs on both

*left three turbo stations and Kobelco energized, water still valved into QDP80 (#2) for cooling

Follow-up maintenance items:

• QDP80 (#1) needs oil before vent
• Green indicator light on QDP80 (#2) pump is burned out

I started to repeat the measurement described in llo alog 28797 while we were waiting for LLO to come back up around 20:05 UTC. Since LLO is back, I have stopped and put things back to normal, and Cheryl is running A2L before we go back to observing. (This was about 45 minutes of commisioning). 

I got as far as tuning an excitation and finding that an offset of around 0.3 in POSY may be about right, but that we need to wait a long time for the OMC ASC loops and the slow kappa C calculation to settle when making these measurements.  The template with the excitation is saved at sheila.dwyer/OMC/OMC_alignment_jitter_check.xml  We will continue this Wednesday.