Prepped IP4 for installation

Finished venting IP4 with bottled UHP N2 (started Friday afternoon then halted).  Also vented (with bottled UHP N2) non-VE side of closed 12.8" gate valve (new VAT valve) mounted on OMC tube and having 16.5"-2.75" CFF zero-length reducer flange with 1 1/2" pump port valve.  New valve doesn't leak!  

Chandra will be in early tomorrow to remove connected equipment and supervise installation of IP4 onto the OMC.  

Shift Summary - Day

TITLE: 01/29 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:

16:00 (8:00) Start of shift

16:15 (8:15) Hugh to End-Y -- HEPI filter change

16:22 (8:22) Ken to End-X -- Piping work

16:48 (8:48) Hugh out of End-Y

17:47 (9:47) Bartlett to termination slabs -- ITM camera work

17:57 (9:57) Phil to End-X -- Looking at cabling for HEPI

18:36 (10:36) Cheryl to IOT2L -- Align cameras

18:45 (10:45) Ed to HAM6 -- Inspect wire

18:58 (10:58) Jenne, Keita and TVo to HAM6

18:59 (10:59) Phil out of End-X

19:00 (11:00) TJ and Jim to End-Y -- PCal baffle work

19:03 (11:03) Hugh to LVEA -- Retrieve hardware

19:12 (11:12) Phil to End-X

19:15 (11:15) Hugh out of LVEA

19:45 (11:45) Cheryl out from IOT2L

20:01 (12:01) Bartlett out for lunch

20:08 (12:08) TJ and Jim out of End-Y

20:10 (12:10) Phil and Hugh out of End-X

20:20 (12:20) Jenne, TVo, Keita out of LVEA

20:59 (12:59) Bartlett to termination slabs -- ITM camera work

21:05 (13:05) TJ and Jim to End-Y -- PCal baffle work

21:10 (13:11) Kyle to HAM4 -- climb up OMC tube

21:13 (13:13) Travis and Betsy to End-Y -- Putting ETMY back together

21:29 (13:29) Ed to CER -- Terminate cables

21:35 (13:35) Kyle out from HAM4

21:53 (13:53) Peter and Gerardo to Optics Lab

22:06 (14:06) Bubba and Mark to LVEA -- Work on snorkel lift

22:27 (14:27) Elizabeth to HAM6 -- Scan components

22:36 (14:36) Patrick to End-X -- Reset power to HEPI pump control

22:40 (14:40) Nutsinee to ISC Rack

22:40 (14:40) Bubba and Mark out of LVEA

22:50 (14:50) Nutsinee out from ISC Rack

22:53 (14:53) Patrick out of End-X

23:13 (15:13) Bartlett out from termination slabs

23:26 (15:26) Jenne, Keita, and TVo to HAM6

23:30 (15:30) Peter and Gerardo out of Optics Lab

23:47 (15:47) Elizabeth out from HAM6

23:49 (15:49) Terry to SQZ bay

23:54 (15:54) Ed out of CER

0:00 (16:00) End of shift

EX ALS fiber path might need realignment

We need to restore ALSX for peeking down the X arm.

We have OK fiber power (though RefCav trans is smaller than it used to in O2), and polarization at EX is not bad either, but there's no beat note.

Left: O2, Right: Now.

Could be that the frequency is too far off or the alignment is somehow bad.

aligned REFL path on IOT2L

The beam on top periscope mirror is roughly centered (this is a change from a few weeks ago), so the beam coming off of the bottom periscope mirror was too high. Adjustments made to clear iris/HWP/CW and beam dumps, and REFL, WFS1, WFS2, and camera recentered.

State of the CDS computing system

I'm emerging from sick leave, so this would be a good time to give a CDS computing summary:

Timing is in error. At around 3am PST Thursday 25th the MCA atomic clock time distribution system went into alarm. Trends suggest its time was varying for about an hour, and then settled to a static large offset. All three comparators in CS, EX and EY see bad times and are reporting the error.

h1oaf model is now consistently running long and reporting timing errors. This started Tue 16th Jan, presumably due to filter changes. I am investigating.

New filters need to be loaded for h1sqz, h1ascimc. If we don't get to this today, we'll cover it tomorrow during maintenance.

Vent Meeting Minutes

Commissioning:

• HAM6 OM alignment next two days
• Make sure ALS is working
• ISCT1 alignment
• IR-only glasses no longer okay
• PSL deferred
• Flange needs final torquing at HAM6
• HAM6 South door off as prep for VOPO
• During X-arm Feb 6th comm work-No entry to HAM6, no VP work
• ZM1 install on hold
• ITM camera install, images on both, need to lock them down
• Tuesday Feb 30th-Laser Safe 7-10AM

CDS:

• ITM work
• Take CS Beckhoff down, scan for hardware

End-Y:

• PCal install vibration absorber
• Later this week NGG pump commissioning
• HEPI end station filter change ongoing

Mid-Y:

• Expect alarms for vacuum work

End-X:

• Conduit work
• Take ion pump off

PSL Weekly Report - 10 Day Trends FAMIS #6185

Besides the ongoing tripping, everything else looks normal.

PSL Weekly FAMIS 7475

Laser Status:
SysStat is good
Front End Power is 35.24W (should be around 30 W)
HPO Output Power is 140.2W
Front End Watch is GREEN
HPO Watch is GREEN

PMC:
It has been locked 0 days, 3 hr 16 minutes (should be days/weeks)
Reflected power = 23.22Watts
Transmitted power = 41.32Watts
PowerSum = 64.54Watts.

FSS:
It has been locked for 0 days 3 hr and 16 min (should be days/weeks)
TPD[V] = 1.968V (min 0.9V)

ISS:
The diffracted power is around 3.9% (should be 3-5%)
Last saturation event was 0 days 3 hours and 12 minutes ago (should be days/weeks)

Possible Issues:
PMC reflected power is high

Laser trip

Came in this morning to find the oscillator off.  The front end was still running.  Looks like the watchdog kicked in
some ime around 5:30 pm Saturday.

    The power decay from head 1 is the reason for the decay in laser output power.  I upped the current of the 3 other
diode boxes by 0.5 A.

    Laser restarted without any major hiccups.  Other stuff came on-line pretty quickly.  Witnessed a couple of
occasions where the injection locking was lost.

Kyle on site checking equipment

VPW, LVEA, Mechanical Room.  I expect to be here less than one hour and will make comment to this entry when leaving. 

1705 heading to Y-end to check on purge air

1725 hrs. local - Leaving site now

SQZ SHG guardian improved

After a negative rail was added to the PZT driver and a new Beckhoff scanning tool became available (thanks Daniel!), I was able to simplify the SHG auto locker and modified it such that the positive and negative rails are taken into account. SHG guardian no longer toggles the offset slide bar to look for resonance but instead sends in a scan to look for resonance. Once the resonance is found, the PZT is offset by that X amount of voltage and the loop is engaged. The code currently looks at Trans PD output power. At some point I'd like to make it look at the reflected green power and make it dependent of the input power (which can be done with the LASER IR PD). If SHG is locked with too much or negative voltage being sent to the PZT, it will drop lock to find another sweet spot. The low limit is currently set to 0V, and high limit is set to 85V.

 

More warning messages and fault conditions will be added in the future. For now it is relatively robust (I think).

OPO aligned for 532

Terry, Nutsinee, Sheila

After looking at the fiber collimators we decided to try swapping them so that the one that has a greenish tint in the lens is used for 1064 and the one that looks very clear is used for 532, based on advice from Lisa, Lee and Maggie. After doing this we were able to align the cavity and saw that our mode matching isn't too bad although we haven't tried to optimize it by moving any lenses yet. 

IP4 tested and vented

Kyle, Chandra

IP4 is back from rebuild and shipped under vacuum (measured mid e-5 Torr range). We pumped down with an aux cart, isolated the turbo, and then turned on high volts and measured 1.8-2 micro-amps at 7 kV on each channel. The pump is now vented with dry N2. Monday we will vent the blank on IP4's new gate valve, verify there is no leak into main volume, and then install IP4.

Mid-Y work

Kyle, Chandra

We tested the leaks in GV12's gate o-rings by flooding the gate annulus with dry N2 (with active turbo connected and ready to be valved in to evacuate) and discovered the adjacent volumes' pressures rise too high too quickly. The Y2 beam tube rose to 7e-8 Torr and CP4 side rose to 1.4e-6 Torr in less than one minute. We may try to jog the gate on Monday to see if we can get a better seal, at least on inner o-ring. Will also re-evaluate the bake enclosure dimensions so see if gate annulus tubing can stay (GV11's definitely gets in the way and had to go).

We realized that we did not get any email or text alarms when we should have - pressure was well past the 5 minute and 15 minute set point thresholds on PT-245B and PT-256B. Will contact Dave B. about this.

ETMY Welding Pics

J. Kissel, for A. Bell, T. Sadecki, and D. Sellers

While on my way to and from B&K hammering the EY PCAL periscope, I snapped a few publicity photos of Angus, Travis, and Danny who were fine-tuning the alignment and measuring violin modes of the brand new fibers of newly suspended H1 SUS ETMY.

Thanks and keep up the good work, gents!

The violin modes were remeasured (with 0.25 Hz accuracy)
position  (Hz)    fibre S/N
+X/+Y	504.5	S1400157
-X/+Y	503.0	S1400159
+X/-Y	513.25	S1800486
-X/-Y	510.5	S1800491

as these will shift after in-chamber alignment, we didn't go for higher accuracy. The  laser we used was quite noisy and should be replaced before using the kit again.