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.

Shift Summary - Day

TITLE: 01/27 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:

14:13 Terry out to Squeezer bay

16:00 Karen ad Vanessa out to EY

17:00 Karen and Vanessa back

17:04 Karen ad Vanessa back to EY - with stock

17:05 Marc out to LVEA-returning chassis to SUS rack near HAM

17:12 Dust Monitor at EY not responding

17:21 Betsy out to EY

17:32 Betsy power cycled dust monitor 2 at EY

17:40 Patrick reset the HV at EX

17:43 Travis, Danny, and Angus to EY

17:47 Patrick back

17:57 Richard out to LVEA - camera check PSL

18:01 Richard back

18:06 Terry back

18:20 Betsy back

18:23 Greg out to LVEA - resetting  TCSY LASER

18:28 N out to optics lab

18:30 Greg back

18:37 Kyle and Chandra moving new ION pump from large high bay to S side floor near HAM4

18:40 Betsy out to EY

19:19 Terry and N back

19:19 Greg out to LVEA - movin curtains from TCSY to TCSX

19:20 Angus, Travis and Danny back

19:40 Dany out to LVEA - pics

20:00 Danny back

20:00 Betsy back

20:05 Jeff back

21:14 Tvo and Sheila out for lunch

21:45 Kyle out to MY

22:02 Peter and Jeff B out to LVEA- ITMX camera

22:10 N, Sheila and Terry into optics lab

22:16 Kyle back

22:30 N back

22:54 Kyle and Chandra to MY

 

 

 

 

00:10 Jeff and Peter finished with the ITMX and ITMY cameras.

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.

ZM2 Fully Functional, Doesn't Care Whether Sat Amp Jumpered to AOSEM or BOSEM Configuration

J. Kissel, R. McCarthy, M. Pirello
FRS Ticket 9771

After solving all of ZM2's signal chain problems (all of which were mis-jumpered boards inside its new HAM-A coil driver and US Sat Amp, see LHO aLOG series starting with 40237), I'd accidentally told Marc to jumper the SatAmp to the AOSEM setting (ZM2, an HTTS, uses BOSEMs). He's jumpered it to the BOSEM setting this morning, so I've taken another diagnostic suite. 

Turns out, though the OSEM sensor response dropped by an inconsequential ~13%, ZM2's BOSEMs don't care whether they're read out with a Sat Amp jumpered in the AOSEM or BOSEM configuration. 

Richard and I recall that perhaps all US sat-amps are jumpered to the same configuration, because (as Richard specifies) one species of OSEM doesn't use the feature implied in that configuration, it just needs to be jumpered to either/or. So we recall having set all US sat-amps one way (or the other). We'll figure out which (by checking the OMs and RMs), and set all the new US Sat Amps (for OFI, ZMs, and VOPO) the same way.

For all intents and purposes, ZM2 is now fully functional.

J. Kissel, M. Pirello, R. McCarthy

Marc has verified that all US Sat Amps are jumpered to the BOSEM position. As such, we need not make any change to the current configuration of the Sat Amp, and we should consider the electronics and suspension in its final functional state.

Thanks for all your help Marc!