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Reports until 17:09, Wednesday 27 December 2017
LHO VE
chandra.romel@LIGO.ORG - posted 17:09, Wednesday 27 December 2017 - last comment - 17:50, Wednesday 27 December 2017(39924)
Corner volume is on turbos....and overall day's summary

This afternoon Kyle and I valved in OMC turbo and YMB turbo. The XBM turbo is spun up but valved out and backed by its scroll. Kyle will lower pressure set points before he leaves today. Corner pressure is 10 mTorr.

HAM 1 turbo was valved in for a second but the power cord needs to be secured better so it was spun back down; will resume tomorrow. PT-100B CC gauge tripped and has been reset. Chamber pressure is 0.1 mTorr.

Aux turbo cart was moved from BSC 3 annulus to BSC 2 annulus. 

Tyler and Mark are working on building three more TMDS tables.

 

Images attached to this report
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chandra.romel@LIGO.ORG - 17:28, Wednesday 27 December 2017 (39925)
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Terry was on site today working in sqeezer bay.

kyle.ryan@LIGO.ORG - 17:50, Wednesday 27 December 2017 (39926)
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Adjusted YBM and Vertex MTP safety valve threshold/setponts to their nominal values of 5.0 x 10-2 torr (foreline pressure at which MTPs isolate from VE).  

Also, I closed the IMC, OMC, YBM and XBM vent/purge valves now that we are on the Turbos and the "dead" volumes between the valve seals and the hose connection blank-offs have been pumped to a rough vacuum.  

Terry had coordinated with us today as to his arrival, work area and eventual departure.


1755 hrs. local -> Kyle leaving site now (unaware of anyone else on site at this time)
H1 PSL
chandra.romel@LIGO.ORG - posted 16:55, Wednesday 27 December 2017 - last comment - 18:09, Wednesday 27 December 2017(39923)
PSL chiller topped off

I topped off the top PSL chiller with 150 mL of distilled water. The bottom chiller indicated OK status so I did not add any water to it. 

Comments related to this report
corey.gray@LIGO.ORG - 18:09, Wednesday 27 December 2017 (39927)PSL
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This closes FAMIS #6555.

LHO FMCS
chandra.romel@LIGO.ORG - posted 10:58, Wednesday 27 December 2017 (39922)
Site check report

[Bubba, Chandra]

Site check complete. Bubba found the MPR door ajar this morning which is my fault. While I checked that it was latched when I locked it yesterday, I didn't tug on it when I left last night. A good reminder that when exiting through that door at night pull on it to make sure it latches all the way.

Found CP7 Dewar head pressure a bit high:  25 psig

No leaks and no weird smells except for some expired meat balls in the OSB kitchen fridge.

I cleared off the X/Y 2-8 solar panels.

LHO VE
chandra.romel@LIGO.ORG - posted 20:05, Tuesday 26 December 2017 - last comment - 08:26, Wednesday 27 December 2017(39908)
Corner pressure monitoring

PT120A: 280 Torr

PT100A: 308 Torr

Comments related to this report
kyle.ryan@LIGO.ORG - 20:30, Tuesday 26 December 2017 (39909)
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Changed my mind and returned to site 20 minutes after having left to valve-out (unattended) pumping from HAM1.  As such, PT100A pressure should remain unchanged tonight.
kyle.ryan@LIGO.ORG - 21:14, Tuesday 26 December 2017 (39910)
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2110 hrs. (PT120=227 torr, PT170=140 torr)
chandra.romel@LIGO.ORG - 21:58, Tuesday 26 December 2017 (39911)
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PT120A: 198 Torr

kyle.ryan@LIGO.ORG - 23:10, Tuesday 26 December 2017 (39912)
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2305 hrs. PT120 = 136 torr, PT170 = 70.4 torr
chandra.romel@LIGO.ORG - 00:03, Wednesday 27 December 2017 (39913)
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PT120A: 80.8 Torr

kyle.ryan@LIGO.ORG - 01:11, Wednesday 27 December 2017 (39914)
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0110 hrs. PT120A = 44.9 torr, PT170 = 34.0 torr
chandra.romel@LIGO.ORG - 02:04, Wednesday 27 December 2017 (39915)
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PT120a: 29 Torr

kyle.ryan@LIGO.ORG - 03:10, Wednesday 27 December 2017 (39916)
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0310 hrs. PT120A = 17.3 torr, PT170 = 15.8 torr
chandra.romel@LIGO.ORG - 03:58, Wednesday 27 December 2017 (39917)
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PT120a: 12 Torr

kyle.ryan@LIGO.ORG - 05:11, Wednesday 27 December 2017 (39918)
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0510 hrs. PT120A = 7.1 torr, PT170 = 7.0 torr
chandra.romel@LIGO.ORG - 06:04, Wednesday 27 December 2017 (39919)
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PT120a: 4.95 Torr

kyle.ryan@LIGO.ORG - 07:04, Wednesday 27 December 2017 (39920)
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0705 hrs.  PT120A = 3.3 torr, PT170 = 3.4 torr
chandra.romel@LIGO.ORG - 08:26, Wednesday 27 December 2017 (39921)
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Corner is pumping down nicely! PT-120A reading 1.98 Torr.

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LHO VE
chandra.romel@LIGO.ORG - posted 17:47, Tuesday 26 December 2017 (39907)
Roughing corner station

We valved in both QDP80 roughing pumps at 3:45 pm local today. Pressure is currently at 480 Torr on PT-120A. We will leave the pumps valved in tonight while we're in viscous flow. We verified both safety valves close upon pump failure. HAM 1 is also being roughed out via scroll pump and will stay valved in over night. PT-100A is currently at 416 Torr. Kyle and I have agreed to check pressures from home every hour and log results.

We are both leaving site now.

LHO FMCS
chandra.romel@LIGO.ORG - posted 17:33, Tuesday 26 December 2017 (39906)
Site report

Site checks out fine. X-mid station air temperature feels warm, but that is to be expected; Bubba reports turning off chillers and we also see a rise in beam tube pressure (and GV AIP currents) since Sunday evening. 

CP3 and CP6 Dewars were filled today. CP3 truck arrived late and is still here (5:30 pm local). 

LHO VE
chandra.romel@LIGO.ORG - posted 11:33, Tuesday 26 December 2017 - last comment - 17:07, Tuesday 26 December 2017(39904)
Rough down prep

[Kyle, Chandra]

Started both QDP80 roughing pumps this morning with a purge air load to let them warm up before valving into corner volume. Blocks measure ~ 70degC.

Kyle checked the pressure of main volume to verify we aren't over pressurizing system with purge air - measured 1/2 psi with calibrated mechanical gauge that we use for proof testing viewports. PT-120A pirani gauge on BSC2 reads 942 Torr, which converts to 3.5 psi over standard atmospheric pressure, but we know this gauge is biased high.

Comments related to this report
kyle.ryan@LIGO.ORG - 17:07, Tuesday 26 December 2017 (39905)
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I recorded the "calibrated" pressure reading taken at the IMC vent/purge connection and compared it to the time-corresponding pressure indicated by PT120A (pirani gauge) all while in pressure equilibrium [0.6 psi versus PT120A indicated value of 941.5 torr].  Recall that we have documented a known problem with PT120A's indicated pressure values for high pressure conditions.  We had tried multiple sensor heads and minimized the ATM potentiometers but just can't get the CDS read back to agree with the known conditions.  For some unknown reason, it is always indicating a much higher pressure than the actual pressure.  We eventually "moved on" but resolved to work with EE/CDS at some point to figure it out (low priority at the time).  

I also measured the maximum pressure available from the purge-air supply using the "fancy" mechanical gauge and measured 1.2 psi maximum.  This agrees with the maximum value ever observed at the mechanical gauges at the output of the purge air supply skid and gives us confidence that we haven't over-pressurized the vacuum system (read "view ports").
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