Hugh R, Jess M 

As of  00:53:00 UTC July 15, the ETMY chamber was in the following configuration: 

• HEPI in robust_isolated 
• Stage 1 in level 2 isolation: gain of 0.8 in Y, gain of 0.6 in X, TBetter on all DOFs except TCrappy on RZ 
• Stage 2 in level 2 isolation: gain of 0.5 on all DOFs, Start blend on all DOFs 

Please leave ETMY in level 2 isolation until 8am tomorrow (if it hasn't tripped by then)

Today Hugh and I spent the afternoon trying to get EMTY stably into level 2 isolation. For stage 1, Hugh brought up the DOFs one by one, and we discovered a giant peak in the actuator output signal (and the L4Cs) in all DOFs at 738Hz as the X DOF gain approached 1. (Giant = most of the actuator power spikes at that high frequency right before the ST1 actuators trips.) We're not sure what might cause this, but it's very reproducible and we plan to look into it later this week. 

We noticed a small peak in the open loop transfer function at about the same frequency, and the level 2 isolation filter gain is much higher than levels 1 or 3 in this very high frequency range.  (See attached.) 

As for stage 2, we had no trouble using the control script to bring it up to level 2 with the Start blend, but sometimes it would trip on the actuators shortly after and we couldn't switch the blend for any DOF without tripping (also on the actuators). 

On Sunday ~1957utc, the VFD on the HEPI Pump Controller at ETMY registered an overvoltage error (OV3) and shut down its output.  The servo was fine, the fluid level was fine.  This OV3 error has occurred before at various pump stations but not too frequently, a few times a year maybe.  No issues getting it back on using the documented procedure.

Today, Travis and I worked on aligning the main chain of the ITMy QUAD to IAS tolerances.  We first tackled some coarse yaw, then used pushers to push the structure in the +x direction to fix a ~3mm error in the lateral position of the optic.  (Some of this error was due to misplacement the first time we set this QUAD on this ISI.)  We then continued on pitch and more yaw and have finished the day with the optic within tolerance in position and pointing.  We will start transfer functions to check for the suspension health, but will likely hand off to SR3 output alignment checks with the PSL beam before continuing on with this QUAD.  (We have not touched the reaction chain yet, other than to clamp it out of the way of the main chain.)

Checked the following cables for possible shorts. 


PRM TOP (Cable 10 air side) - Found short on Pin 13 to chamber ground. Andres inspected cabling and saw no obvious short. He removed aluminum foil cable tie on table and short disappeared. Could not reproduce short.

PRM RIGHT and SIDE (Cable 11 air side) - Did not find any short to chamber.

PRM Middle (Cable 31 air side) - Found short on Pin 13 to chamber ground. Traced in-vacuum cable to feedthru. Short appears when you move the cable going into the connector. Will need to repair or replace cable.

MC3 Middle  (Cable 25 air side) - Found short on Pin 13 to chamber ground. Andres inspected cabling and saw no obvious short. He removed aluminum foil cable tie on table and short disappeared. Could not reproduce short.

Filiberto C. / Andres R.

New preliminary dust monitor code is running to support Met One GT-521S dust monitors at EX. There are 2 monitors that are supported by the code, and it works better if they are not turned off or disconnected.  If they need to be moved, contact Jim Batch to make sure they get started and data continues to flow.

The following EPICS channels are available for monitor 1:
H0:PEM-EX_DUST_VEA1_300NM_PCF
H0:PEM-EX_DUST_VEA1_500NM_PCF
H0:PEM-EX_DUST_VEA1_300NM_RAW
H0:PEM-EX_DUST_VEA1_500NM_RAW
H0:PEM-EX_DUST_VEA1_ACTSAMPLETIME
H0:PEM-EX_DUST_VEA1_DATESTR
H0:PEM-EX_DUST_VEA1_TIMESTR
H0:PEM-EX_DUST_VEA1_UNIXTIME
H0:PEM-EX_DUST_VEA1_STATESTR

Monitor 2 has the same channels with VEA2.

Note that the sample time is programmed into the dust monitor at 20 seconds, with a hold time of 300 seconds.  These values are not changeable from the control room with the present software.  Also, these are two channel devices, and only count 300nm and 500nm particles.  

• 9:00 Nathan beginning laser work in Optics Lab----->Dick will work with Nathan after 4pm
• 9:05 Justin heading to both end stations
• 9:08 EX vent beginning (starting with closing GV20), around 10:30 getting ready to vent--->vented by 11:30
• 9:16 Removing SRM First Contact (Betsy)
• 9:20 Locking HAM4 HEPI (Hugh)
• 9:22 Film crew heading to LVEA (Dale)
• 9:30 EX Laser SAFE (Justin)
• 9:38 Unlocking ITMx & assist with other SUS work (Travis)
• 10:01 EY transitioned to Laser HAZARD (Justin)
• 10:50  Film crew heading to beer garden
• 10:50 LVEA partial Laser HAZARD (Justin)
• 10:55 SR Alignment check (Kissel)
• 11:01 ITMy IAS work (Jason)
• 12:04 EX Dust Monitor software work (Jim)
• 12:53 EY hepi work (Hugh)
• 1:20pm SR Alignment check completed--->will transition to LVEA laser SAFE
• 2:00 HAM2 ground loop checks (Filiberto/Andres)
• 2:09 PCal crew staging/touring EX
• 2:26 PEM Crew heading to EX to calibrate accelerometers
• 2:48 Inspecting HAM4/5 optics (Calum/Kate/Nicole)
• EX now has (2) Dust Monitors for the EX vent.  They are currently NOT connected to the Alarm Handler
• 3:31 Mode measurements of the OFI by Kissel begins
• 3:35 Crash phone rung.  Only received beeps.  No messages...went to dial tone after a 30sec of beeping.
• LVEA trasition to Laser SAFE in the afternoon

A. Pele, K. Izumi, J. Kissel

After unlocking ITMX and pulling the first contact from SRM, we wanted to re-check our report of finding the IFO beam going through the HAM5 OFI. I outline the process below, but in summary, we have found an alignment that again gets the beam through the OFI, but with the beam mis-centered in YAW at SRM with +200 [urad] YAW offset on SR2 ~16 [m] away. Below are the alignment deltas from what we had in DRMI, i.e. pre-vent. We can be comforted in that the alignment change of the input chains are all ~0.5 [mrad] in P and Y, and within the range of the alignment sliders. This gives us confidence that IAS values for the new ITMX are quite good, and we should have only to do a similar amount of effort to get the Y-ARM beam also to go through the OFI hole.

Attached are pictures from the morning's activity, as well as a cartoon drawing of how the alignment into the OFI changes between an SR2 Y offset of -800 [urad] (clipping on input) vs. -600 [urad] (centered). The coordinate system drawn to the left the cartoon is global IFO coordinates. Finally, a screenshot of the alignments for all SUS.

Alignment Deltas:

     Pre-vent [urad]             Now [urad]          Diff [urad]
        P       Y              P         Y         P         Y
MC1   +1254   -2366.0     +1254.0    -2366.0    (none)    (none)
MC3   -550.0  -2467.0      -550.0    -2557.0    (none)      -90.0
IM1      0.0  +1469.0         0.0    +3786.1    (none)    +2317.1
IM2  +4600.0  +2000.0    +35849.3    +5154.7   +31249.3   +3154.7
IM3  -1397.9  +1060.8    +14057.0    +5464.0   +15454.9   +4403.2
IM4  -2350.0  -3607.0    -30000.0    -9337.0   -27650.0   -5730.0
PR2   +434.7   -355.7         0.0    +1350.0     -434.7   +1705.7
PR3   -245.5   -250.9         0.0     +250.0      245.5    +500.9
BS    +180.6   -266.4      +750.0     -600.0      569.4    -333.6
ITMX   +38.7    -48.9         0.0        0.0      -38.7      48.9
While we've changed the IMs quite a bit in both pitch and yaw (presumably to account for the bypass beam), but downstream all optics (PR2, PR3, BS) have not changed more than 0.5 [urad] in pitch, and PR2 is the worst offender with ~2 [mrad] in yaw, with the rest also below 0.5 [mrad]. These changes (at least of the large optics) are well within the range of the core optics. The largest offsets on the IMs are taking up ~80% of the DAC range.

Alignment process this morning (again, after release of ITMX and removal of SRM First Contact): 

- Check beam at SR3. Looks like clipping
- Check beam at AS port, AR side, output side of BS, see clipping.
- Check beam centering on ITMX -- is mis-centered. Tweak alignment of PR3 to center on ITMX.
- Check beam at AS port, AR side, output side of BS -- clipping alleviated.
- Check beam through HAM4 between HWS baffles, no clipping.
- Check beam at SR3 -- clipping alleviated.
- Re-center beam on SR3 using BS.
- Re-center beam on SR2 using SR3, making sure of no clipping on SR2 scrapper baffle.
- Re-center beam on SRM using SR2, still no clipping.
- Confirm that beam no-longer goes through input of OFI with SRM centering, using SR2 offset of Y = -800 [urad] (P as shown in IFO Align screen).
- Move SR2 to Y = -600 [urad], find that beam goes through OFI hole, but is now miscentered on SRM. Should be walk-able / recoverable, but we'll wait for beam from Y ARM before we move anything.

Laser

• Laser is ON
• Watchdog is ACTIVE
• SYSSTAT shows a RED "LRA out of range"  (LRA = Long Range Actuator).  Peter King was notified.

PMC

• Locked 2days8hrs (should be days/weeks)
• Reflected power is 3.9W (which is 17% of the Transmitted [22.4W] Power)

FSS

• Locked 2days 8hrs (should be days/weeks)
• Trans PD is 1.04 V (should be atleast 0.9V)

ISS

• AOM Diffracted Power  = 6.3% (should be around 10%)
• Last Saturation Event was 2+ days ago

Restarted End-X weather station epics ioc. It died about 12:09 PDT today for reasons only slightly related to dust monitor work, when the Comtrol web page was accessed.

Late last week after we aligned the entire SR chain with the PSL beam, re rediscovered that we had left the ITMx clamped.  So this morning, I entered through HAM 4 (since we have blocked off the door to BSC3 for laser safety reasons) and unclamped the ITMx.  Hopefully the realignment now will remove some of the bias we had to put on the BS to shoot to the center of SR3.

After adding a peek tab and waiting a while this AM, I attempted to pull the little 1" sheet of FC from the SRM-HR (surrogate optic) surface.  THe peek tab pulled off, removing a perfect square window behind it where the peek tab had been.  SO, I filled in the hole in the sheet with more FC and reattached the peek tab in another location around the pericmeter of the sheet.  After ~45 mins the peek tab pulled the entire sheet off (with N2 blow).  On to re-alignment of the SRs.

So the crew could climb into the plenum, HAM4 HEPI was put on its mechanical stops.

Translational dofs shifted from controlled position less than 60um.  Rx tilted -4urads, Ry tilted 2urads, & Rz rotated 3urads; hopefully that is close enough.

What I was able to hear from meeting:

• SRM alignment check this morning? (pull first contact (Betsy),  laser hazard (Justin), & check)
• Lower SR3 OSEM adjustments this afternoon when Laser SAFE (Jeff/Andres)
• Status:  SEI HAM4 & 5 balanced, & locked
• SR2 (calum/kate) start cleaning while locked?
• ITMy--coarse alignment, address 2mm misalignment? 
• BSC3--trying to close, wait for clean by Calum/Kate cleaning
• BS--parts (wire protection baffle) in C&B/avail Fri for installation?
• EX Status:  vent slated today (door off tomorrow), no first contacting required of ETMx,need ISI locked, need laser hazard (but can transition when needed). 
• EX:  TMS first part of week, may want to correct TMS pitch (which has been corrected by using HEPI up to now)
• EX:  PCAL starting midweek.  need new SOP for their laser
• EY--bakeout of deionizer (out Fri), drill holes for it? 
• EY--pulling cables for beam centering wfs
• EX pulling cable for dust moniters (require code change)
• RCG upgrade for Channel Monitoring (Jamie), parisitic checks, possibly use/test with ETMy
• Viewport surveys:  HAM4,5, BSC3
• Detchar Meeting Mon-Wed this week
• Film crew here this morn
• Jordan & Paul new students from UofO arrived

The power watchdog for the frontend laser was (re)started this morning.

On a side note, the water level in the crystal chiller was about half way between maximum and minimum.  I added 200 millilitres to bring the level up to maximum.

no restarts reported.

no restarts reported.

Worth noting - we had a strong EQ yesterday (an M6.5 off the coast of Japan) arriving at ~19:40 UTC (Friday July 11).  

Of the two SEI chambers actively isolating that day: 

• ETMX, which was fully isolated (both stages at level 3), saw both stages trip simultaneously (independantly) on the actuators at the time of the quake (ST1, ST2) 
• ETMY, isolated at level 1 (see alog 12706), rode the EQ out and did NOT trip 

A trend of the ground BLRMS for the day of July 11 is attached (made with ligoDVweb because BLRMS trends not accessible via nds recently -  units in nm/s not counts). 

Just one example, but could be worth exploring. 

(Travis, Betsy, Kissel)

After getting the handoff beam from the input HAMs, we double checked that the beam was centered on the ITMx.  We then traced the beam and found it miscentered on the SR3 HR baffle (in front of SR3).  Using the BS bias, we were able to roughly center the beam on SR3 - using ITMx bias didn't seem to drive the beam very much.  We needed to use half of the BS YAW bias, however.  Once centered, we looked at SR2 and found the beam within 1-2" centered on the optic (with 0 bias on SR3).  We then used a bit of SR3 bias to roughly center on SR2.  Heading over to SRM, we again found the beam within 1-2" from the center of the optic and centered it using some SR2 bias.  We then verified that the beam (although blocked by a layer of First Contact on SRM-HR) sprayed through the OFI and out to HAM6.  We suspect the OFI alignment "won't take much."

Notes:

We paused to recheck the ISI locking of HAM5 when we observed that the beam wobbled when we rested on the table.  It seemed pretty locked, but the beam didn't seem to wiggle as much after we squeeked the lockers a bit more.

We increased the damping gains on the SR3 in order to help with the wobbling beam.

We started the realignment of the SR3 lower stage OSEMs.

Next up for HAM4:

Install TCS Temp Sensor Cable

SEI ISI Testing

FC Clean SR2

Chamber Closeout

Next up for HAM5:

Align all lower stage OSEMs on SR3 - a nasty task and will take a few hours, including checks of healthy SUS along the way

Pull FC on SRM (minor task)

OFI Alignment

OFI Res Testing

Install TCS Temp Sensor Cable

SEI ISI Testing

FC Clean SR3

Chamber Closeout