While the spectrum looks pretty good, the DC level which typically appears DC coupled, the offset from zero is >4000 counts.  It would appear from trends that this has been the case for months but since we don't use these sensors for anything we've decided to ignore this.  And if the spectrum is good, maybe the sensor is still usable

Attached is spectra from ~3am this morning and the IPS weirdness is evident, the issue with the H1 L4C is not as obvious.  Historically looking at past data (back to Dec 2013,) the L4C variance is noted but the IPS looks worse now.

Replaced non functioning whitening chassis S1101631 with S1101602 on 10/15

The X channel was on the rail and the Z had 20000 or something.  So, I rezero'd again this morning.  Currently showing 12000, 1000, & -10000.  So a little better.  I would think these should ultimately be moving around zero unless suffering from large temperature cycling.  I'd think it would be pretty steady in the LVEA under the igloo.

Ideally, we'd look at the U V W signals but those aren't available that I've found for the ground seismometer.  They are accessible on the chassis front panel, maybe I can look at them.

Attached is two days trend showing me disturbing the machine yesterday, subsequent zeroing, followed by about 12 hours of drift on X & Z and again this morning's zeroing.  Interesting the Y axes don't really show any dramatic drift that X & Z exhibit.

Like HAMs4 & 6 re my 14373, HAM5 needed to have the ST0 L4C to Cartesan matrices corrected.  These signals go to Sensor Correction and Feed Forward and aren't being used now.  So I again checked all the other matrices and yes they were still correct so I reloaded all the matrices.  The platform tripped (I should have expected that and taken the platform down first.)  The untripping of the watchog was not usual and it is noteworthy.

The watchdog medm showed a red Rogue Exc WD.  Usually, a reset all,  a Rogue Exc reset, and finally another reset all will green everything.  This time however that did not work.  The Rogue Exc finally cleared when I hit the reset on the already green SEIHAM5 DACKILLIOP found on the SWWD HAM5 medm.

I'll press Dave as to why this was because it might slow down an operator getting the machine back up.

At the request of Jameson, I had done the output HAMs on Monday and this morning I completed all the others.  None of the platforms were disturbed so this was completely non-invasive.  In general though, the restarted node switched to EXEC with a request of NONE.  Returning the mode to MANAGED and the request to whatever put things back with no fuss.  The Chamber manager typically lost communication with the subordinate but I always restarted it last and all finished in good shape.  I say "In general...and ...typically..." because the behaviour was not universally consistent.

no restarts reported. First day after memory increase in QFS writers.

Kiwmau, Alexa, Sheila

Tonight we were having difficultly keeping DRMI locked stably, so we decided to spend some time looking into it rather than continuing to try locking the arms +DRMI.

First we had a look at our ASC loops.  We copied the filters from the OMC QPD centering servos for the AS WFS centering servo, this keeps the beam centerd on the WFS much better.  We also had to use the picomotor to steer it a few times because we ran out of range wth OM2.  Sometimes our 4 DRMI ASC loop (AS A 45 Q to BS, REFL A 9I to PRM) worked, well, sometimes they did not.  We loked again for a signal to use for SRM, (they are using refl B 45 Q at livingston according to 13513)  So, far, all of the 45 signals have a large offset.  We haven't looked at 36, or AS B since we don't have AS B centered. 

We decided to try some TCS CO2 laser on ITMX to see if this would alleviate our mode hopping problem.  We tunred the CO2 laser on at 1 Watt.  We had DRMI locked with our 4 ASC loops working, however the buildup in DRMI degraded.  We then measured the contrast by locking mich on the dark fringe then the bright fringe.  32 minutes after we turned the laser on, the contrast was 97.8%, (worse than what Kiwamu measured 13824) it continued to get worse for the next ten minutes.  We then turned off the laser, and watched the contrast improve (kiwamu has the screenshot). 

We then looked at G1401119, to gues that we need about 370/572 of the laser power that livingston uses, ( 14673), so we set the power to 180 mW, according to H1:TCS-ITMX_CO2_LSRPWR_MTR_OUTPUT, which is a requested power of 0.12 and an angle of 45 degrees on the rotation stage.  (we set this at 8:09 UTC on october 16)

Here are some lockloss times for DRMI 2:51:29 UTC 2:57:07 (arms were locked with ALS)

DIFF 2:34:40 2and 2:37:20 UTC all of these times are october 16

Rick, Filiburto, Richard, Jim, Dave

During the PCAL install yesterday Rick was having problems driving DAC outputs through the 8 channel 18bit AI chassis. Today we put this chassis onto the DAQ Test Stand and verified that signals were indeed coming out of the front panel. However when we reinstalled the chassis at EX we discovered that channel 1 was being output as channel 5, 2 as 6 etc and channel 5 was outputing as channel 1 (basically the lower and upper blocks of four channels were reversed). Internally the filter board has two DB9 connectors, so this is where the 8 channels are divided into two sets of four. It would appear that the ribbon cables connecting the filter board to the input board are reversed judging by the cable lengths. We reversed the cables and this unit is ready for reinstall at EX.

We will discuss this issue tomorrow with Richard to see how we can proceed on getting the fix to all the 8 channel PEM/PCAL AI chassis. Note these are different from the SUS AI chassis which have 16 output channels and are driven by two DAC cards.

SudarshanK, TravisS, RickS

We moved the ETMY camera from the viewport above the Pcal input viewport to the viewport adjacent to the optical lever input port down at the bottom of the A1 adapter.

This location gives a more complete view of the ETM (less occluded by the Arm Cavity Baffle).

Fitting the camera can in that location required rotating it about 10 deg. due to interference with the OptLev sheet metal cover. The GigE camera was rotated to roughly orient the view such that the flat on the ETM is vertical.

An image of the ETM with the new camera view is attached below. 

Worked continued with installation of PCAL electronics at EX. All long field cabling were pulled in yesterday morning. This afternoon, we continued with dressing of cables and started installing DC power supplies.

Whitening chassis S1101631 was removed from the ISC-R1 rack this morning. Unit was found to have missing positive rail. Unit was replaced with new unit (Need to get serial number).

This aLog is a little postdated as this issue happened on October 11th. I was attempting to get calibration values for the rotation stage on the ITMx CO2 table, but I was seeing hardly any power from the laser. I should have been getting ~5w by the periscope and was only seeing ~1w. Power output directly out of the laser was reading ~20w during continuous wave operation but should have been >50w. Luckily the problem was found fairly quickly. The power cable on the outside of the table enclosure was not screwed in and the Connec connector had come partially out. Interestingly this had the effect of only partially supplying the RF driver and so the laser ran at a reduced capacity.

Day Shift Summary
LVEA is Laser Hazard
Observation Bit: Commissioning

09:15 Transition LVEA to Laser Safe. 
09:30 General LVEA post installation cleanup
09:55 US Linen on site to meet with Bubba G.
10:01 Ron - On site to visit Kyle for leak detector repair
10:25 Kyle – going to End-Y
10:39 Paradise Water on site
11:10 Filiberto – End-X top swap whiten chassis, and cleanup end station
11:30 LVEA cleanup completed
11:47 LVEA transitioned to Laser Hazard
13:25 Filiberto – End-X to work on PCal cabling
14:28 Rick – Going to End-X
14:55 Rich – Going to End-Y to mount camera
15:10 Dave & Jim – Going to End-X to check ISC chassis problem

With this valve open, only a single NW blank seal separates the VE (and beam tube with 44" gate valves open like current state) from atmosphere - Ouch!  Closing this valve after rough pumping is in the procedure but was missed, apparently.

The ISC Whitening chassis S1101631 mentioned in Kiwamu's log entry (14430) was removed from the X-End LVEA electrnoics rack. The -15VDC failed. I also removed a small snake from the computer cart all snuggled up to the warm monitor and keyboard.