Continued HAM6 Alignment work

Keita TVo

We first set the final position of the fast shutter and the cable routing as well as position the reflection of the shutter to the center of the beam dump.  This is done and the fast shutter has one tightened dog clamp on each side.  The incoming beam from HAM5 clears the shutter wire by 10 mm and the structure is even further than that.  We had similar difficulties with closing and opening the shutter as yesterday but Keita seems to have found a way to make it work with some odd logic that he will post about in a comment.

We've also aligned the AS_AIR path through to the viewport simulator as well as the beam diverter and the beam dump.  Note of caution, when Jason and I installed the viewport emulator, it was already well aligned to three blank flanges on the other door of HAM6. Keita reminded me that this is not the same as an actual viewport with its viewport protector housing attached so we tried our best guess to account for this by eye when aligning the beam coming out of the chamber.  I've attached a picture that shoes where the beam is coming out of the emulator, it is at the bottom most corner of the laser card.

Next step was OMC_TRANS path which was particularly difficult because the OMC would not stably lock with the purge air on and even when it was locked, we were not able to see anything coming out of the shroud.  It was getting a bit late by this point and this alignment should be done with three people

Cycled GV12 and remeasured gate annululs O-ring leaks

Chandra, Gerardo, Kyle 

We would like the option of removing GV12's external gate annulus piping so as to relieve a potential interference with the to-be-installed bake enclosure that will encompass GV12, CP4 and GV11.  This enclosure will allow the bake-out of CP4 as part of its decommissioning.  Removing this external piping requires venting the annulus volume for a long enough duration as to remove the piping, blank-off one of two ports and then install a valve on the unblanked port which would allow the re-evacuation of the vented volume.  Unfortunately, as was the case with GV11, GV12's gate annulus O-rings leak into the adjacent vacuum volumes (Y2 beam tube module and CP4) and thus limit how much time we could tolerate the annulus volume being vented.  We recently demonstrated this by admitting UHP N2 into GV12's gate annulus and then observing the pressure response in the adjacent vacuum volumes.  

Today, in an effort to reduce or eliminate GV12's poor sealing gate, we "slow" opened it by letting the variable speed electric actuation motor ramp up from 0 rpm up to 1000 rpm and then pausing for 30 seconds to allow the "sticky" O-rings to pull away from sealing surface.  This gets repeated a few times until the adjacent volume's pressure gauges confirm that the gate is no longer in contact with the sealing surface.  Once the gate is freed, we then "hard closed" GV12.  Next, we administered ~ 1 LPM of UHP N2 into the entirety (combined) annulus volume for 3 minutes before aborting the gas admission and evacuating.  

Moved small garb/change room from Beer Garden to Y-mid

Kyle, Gerardo 

We need this at Y-mid for Class-A work at CP4

analog cameras on HAM2

Analog cameras installed, aligned, and hooked up to power and BNC cables.  Camera BNC cables are named PRM, MC1, and MC3.  PRM is viewable from the CR.  MC1 and MC3 show video lost.  Not sure if cables at HAM2 match the analog camera medm.  And... after I finished writing this, I went to change the top monitor in the CR to PRM, and I don't seem to be able to change that monitor now.

- Hugh, Cheryl

Shift Summary

16:45 Travis to optics lab

16:50 Hugh to LVEA for survey equipment

17:10 Peter to optics lab, out 17:30

17:50 Hugh to BS, looking at HEPI actuators

18:00 JeffB to HAM6 for dust monitor

18:00 Nutsinee Daniel to SQZ

18:10 Tvo, Jason putting viewport emulator on HAM6

18:40 Jason, Kyle Gerardo looking at oring protectors for HAM6

19:00 Elizabeth to HAM6 racks

19:20 JeffB to EX

19:30 Chandra, JohnW to LVEA

20:00 Terry to SQZ

20:30 Betsy Travis to EY, back 23:20

21:00 Elizabeth to MY

21:00 Kyle Gerardo opening LVEA rollup door

21:00 Cheryl working on analog camera at HAM2

21:15 Keita Tvo to HAM6

21:40 Kyle Gerardo to MY

21:40 JeffB to both ends

22:35 Kyle Gerardo Chandra working on GV12, done 24:00

23:05 JeffB to EX

ETMY SUS Status - ETM16

This afternoon, Travis and I rolled the ETMY/PUM monolithic main chain from the weld room around to it's AERM/PenRe reaction chain pal in the staging room next to the chamber.  We used the Genie duct jack to lift the ETMY set from it's trolley and place it next to the AERM double.  After some alignment checks, we pushed them together and fastened up their 8 mating screws.  We left the newly married couple covered and ready for tomorrow's big adventure back into the chamber to meet their upper half.

Thanks Peter for the photo assay of today's work on this!

A small assortment of pictures from yesterday.  Most pictures appear hazy due to the intervening
cleanroom enclosure curtains.

Weekly ISI CPS Spectra

ETMY, HAM6 ISI & HEPI are both locked. Other spectra look normal. 

Laser Locking

Nutsinee Marc Daniel

The (hopefully) final version of the TTFSS V4 has been installed. The modifications are described in E1700364. To increase the beat note strength the first directional coupler in the TTFSS preamplifier has been replaced by a splitter which results in 8dB more gain.

The ugf is around 500kHz with a crossover around 30kHz. The autolocker seems to be working fine too. Plots to follow.

Weekly PSL Chiller Reservoir Top-Off

Added 100ml to the crystal chiller.

Viewport Emulator Installed on HAM6 North Door

The viewport emulator is now installed on the HAM6 north door to facilitate ISC beam alignments.  We needed to clock the o-ring protectors 3-4 bolt holes (don't remember which) clockwise to get the holes lined up so the emulator would bolt on straight (LHO WP 7322.  We initially thought the wrong protectors were installed, turned out it was a simple mispositioning when they were intially installed.  This also closes WP 7322.).

ISCT6 Mode Matching

Terry, Nutsinee, Sheila, Daniel

The mode matching solutions of the beam paths on ISCT6 are attached.

Mode matching of Mephisto 1064 nm laser to the SHG > 98%

Coupling efficiency of PSL path to fibre 80% 

Coupling efficiency of LO path to fibre 75% (same solution as for PSL path).

Coupling efficiency of PSLLO path to fibre 75%.

Coupling efficiency of Green pump light to fibre for OPO 85%.

Coupling efficiency of seed path to fibre 88% 

Coupling efficiency of CLF path to fibre 81%

Added SQZ and SQZWFS to SDF Overview MEDM

I have added SQZ and SQZWFS front end models' SDF info and links to the main SDF_OVERVIEW MEDM. I've squeezed them in between ISC and PSL (see attachment).

HAM6 work, much progress, almost complete

[Georgia, Sheila, TVo, Jenne]

We completed several tasks in HAM6 today, and will perhaps be (crossing fingers....) done in there tomorrow.

• Offload of sliders from yesterday (alog 40323) still good, while input beam in position from yesterday during the day.  See snapshot of OM2 and OM3 outputs when those were used as the OMC ASC actuators (OMs_yesterdayAfternoonSettings.png, lower right corner).  SR2 needed to move by about 20 urad for us to get through the OFI, but this is likely due to the input beam small shift from yesterday.
• Put input beam back to where Sheila and TVo had it last night (alog 40325), turned on OMC ASC again with OM2 and OM3 as actuators.  Outputs still smallish, max ~4500 out of 32000 (OMs_yesterdayEveningSettings.png, lower right corner). Keeping this alignment going forward. 
• Dressed the fast shutter wire, copying LLO's method of using the screw hole on the top of the shutter's shoulder.
• Put the OMC shroud piece that had been removed, back on.
• Ensured the beam transmitted through OM3 was roughly centered on the AS WFS.  We can tweak this up a teeny bit with the picos when we have more power, but we're within about 0.5 normalized units of center for each WFS.  This required translating the first steering mirror after OM3 a teeny bit, and twisting it in yaw.  Dogged that one back down, then needed to twist the last steering mirror before the sled a small amount to center on the lens and mirrors on the sled.  Used the screws that the pico motors are on to get the beams roughly centered on the WFS.
• Recentered the beam on the AS_C path.  This required moving the lens right in front of AS_C a bit, although closer to its original position (we had moved it a bit last week when we first got beam onto AS_C). 
• Replaced the OMC REFL beam dump black glass with SiC.  We then moved the OMC REFL beam diverter out of the way (it will eventually be utilized by the squeezers on the other side of the table) and put the beam dump where the diverter had been.  This means that we don't have beam on the OMC Refl QPDs, but I don't recall ever having used those signals in the last few years.  This is also the same location that LLO used for their OMC REFL beam dump.  This required a taller post, which Corey was able to find for us.
• Steered the beam that is for AS AIR to be hitting the center of the AS AIR beam diverter, when the beam diverter was closed.  We'll check this again tomorrow once we have the viewport simulator installed, but this should certainly be pretty close.
• We can't see the beam at OMC Trans, that is supposed to come out to ISCT6 for the camera.  With the purge air up, we can't lock the OMC, and we weren't able to see the flashes on an IR card.  We'll think on this again tomorrow, but we're supposing that since the OMC hasn't moved, the trans beam should be coming out in the same place as it used to.
• We checked beam clearances.  They all seemed good.  TVo will post the numerical values as a comment to this alog.

Still to do:

• Check fast shutter reflection.  We can't figure out how to get the fast shutter to stay closed.  With the driver and high voltage on, we were able to get it to close, but then it would immediately reopen.  It has been suggested that if the driver is on, it might "drift up", but if this doesn't happen overnight we'll need some help convincing the shutter to stay closed while we finalize its position.
• Check AS Air path comes out of viewport simulator.
• Check OMC Trans path comes out of viewport simulator (maybe, if we think we'll be able to see the beam).
• Take photos, including fast shutter wire clearance, location of new SiC beam dump.

IP4 installed

[Mark D, Tyler G, Bubba G, Kyle R. Gerardo M. Chandra R]

Team effort today installing, leak checking, and activating ion pump #4. Mark, Tyler, and Bubba installed the pump this morning (thanks, guys!) and then Kyle and Gerardo leak checked with calibrated leak detector. We found a small (1.9 Torr-L/s) He leak at the 8" CFF (from factory bake?). I tightened the fasteners and made leak significantly worse (e-8 range), but then Kyle improved it with some muscle. We're calling it good at 1.1e-9 Torr-L/s He and turned high voltages on. Current was high to start (23 mA), but coming down with time.

SR3 Heater mod to TCS EtherCAT Chassis

Ed, Fil, Marc

This morning we added Beckhoff terminals to the TCS chassis for the SR3 Heater per WP7283.  More information can be found here: D1102207-v6

ETMY SUS Status

Today, we launched the rework of the PenRe Pitch Mass (found problem yesterday 40322) and will be back in business with that hopefully in the next few days.  Travis rebuilt the PenRe without it and re-stuffed it back in the ETMY SUS structure.  (The pitch slider will be an easy add later.)  We then installed the new Annular End Reaction Mass into the structure below the PenRe.  Serial number of this mass is AERM-07.  We set the roll of the mass by eye to better than ~1mm and suspended it as a single from the PenRe.  It looked pretty good in pitch given that the PenRe wasn't sitting perfectly in it's stops above.

Shift Summary - Day

TITLE: 01/30 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC

STATE of H1: Planned Engineering

INCOMING OPERATOR: None

SHIFT SUMMARY:

LOG:

15:18 (7:18) Mark and Tyler to LVEA

15:50 (7:50) Hugh to LVEA -- Surveying

15:50 (7:50) Jeff to LVEA -- ITM-X camera work

16:00 (8:00) Start of shift

16:05 (8:05) Bubba to OMC -- Help with ion pump

16:34 (8:34) Bubba back from OMC

16:40 (8:40) Phil, Peter, Ed to diode room -- pulling fiber

16:46 (8:46) Chris to end station VEAs -- FAMIS tasks

16:52 (8:52) Tyler out of LVEA

17:03 (9:03) Mark out of LVEA -- Ion pump installed (not electrically)

17:10 (9:10) Mark to LVEA -- Find grounding bolt for ion pump

17:13 (9:13) Marc to TCS

17:16 (9:16) Tyler and Travis to End-Y -- grabbing part

17:19 (9:19) Mark out of LVEA

17:21 (9:21) Hugh out of LVEA

17:35 (9:35) Gerardo and Kyle to LVEA -- IP4 work

17:50 (9:50) Chris back from end stations, going into LVEA

17:52 (9:52) Nutsinee to SQZ bay, then Optics Lab

17:58 (9:58) Ed back from diode room

17:58 (9:58) Travis and Tyler back from End-Y

18:05 (10:05) Gerardo and Kyle out of LVEA

18:26 (10:26) Chris back from LVEA

18:28 (10:28) TVo and Sheila to HAM6

18:30 (10:30) Betsy to LVEA -- Find parts

18:34 (10:34) Terry to SQZ BAY

18:54 (10:54) Betsy out of LVEA

19:06 (11:06) Gerardo and Kyle to LVEA -- IP4 work

19:20 (11:20) TVo and Sheila back from HAM6

19:44 (11:44) Gerardo and Kyle out of LVEA -- IP4 work still in progress

20:11 (12:11) Daniel out of SQZ bay

20:52 (12:52) Nutsinee out of Optics Lab

21:04 (13:04) Betsy and Travis to End-Y -- Assembling ETMY

21:11 (13:11) Bartlett to LVEA -- Remove dust monitors

21:15 (13:15) Ed to CER -- Cable work

21:26 (13:26) Ed back from CER

21:26 (13:26) Ed and Phil to CER -- Re-terminate cables

21:39 (13:39) Kyle to Y-Mid

21:39 (13:39) Nutsinee to Optics Lab

21:46 (13:46) Jenne, TVo, Sheila to HAM6

21:48 (13:48) Marc to LVEA -- Re-terminate cables

21:52 (13:52) Ed, Marc, and Phil back from CER

21:58 (13:58) Corey to End-X -- Organizing

22:09 (14:09) Phil to End-Y -- Taking measurements

22:38 (14:38) Georgia and Cheryl to HAM6

22:54 (14:54) Gerardo to CP1 -- Take photo of setup

22:53 (14:53) Cheryl back from HAM6

23:00 (15:00) Corey back from End-X

23:05 (15:05) Gerardo back from End-Y

23:07 (15:07) Nutsinee back from Optics Lab

23:10 (15:10) Kyle back from Y-Mid

23:12 (15:12) Betsy and Travis back from End-Y

23:12 (15:12) Betsy to LVEA -- Put away materials

23:15 (15:15) Chandra to LVEA

23:22 (15:22) Travis to LVEA

23:22 (15:22) Daniel and Nutsinee to SQZ Bay

23:27 (15:27) Corey to Optics Lab -- delivering part

23:30 (15:30) Ken back from End-X

23:39 (15:39) Corey back from Optics Lab

23:47 (15:47) Travis out of LVEA

00:00 (16:00) End of shift

Testing EX HEPI pump control running on Beckhoff

Filiberto, Hugh, Patrick, Richard

This morning Hugh and I took the end X ISI guardian to ISI_DAMPED_HEPI_OFFLINE. Hugh and Filiberto then went to end X and Filiberto moved the wiring from the existing HEPI pump controller box over to the Beckhoff box. We found some minor issues with the Beckhoff PLC code that I corrected. Restarting the PLC code tripped off the power to the HEPI pump motor and I went to end X to reset it. We have since tuned the Beckhoff PID (actually just PI) and will leave it running overnight.

Filiberto, Richard, Patrick

Today we took it off of PID control and ramped down the VFD. Filiberto then went to end X and connected the VFD readback signals to the Beckhoff terminal. We then turned the PID back on. It is currently keeping the differential pressure at 70 psi.