TITLE: 08/31 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Commissioning
INCOMING OPERATOR: None
SHIFT SUMMARY:

First part of the day was devoted to opening the EX gate valve & then making attempts at locking.  So far, for locking we have been dropping out at the CARM_5PM step.

NOTE:  Tomorrow morning Kyle would like to enter the end stations to transfer TMDS equipment from EX to EY (this is for discharging ETMy on Tuesday Mainteance).

LOG:

• 15:28 EX Gate Valve opening prep (Kyle & Bubba)
• 15:57 HAM6 cabling (Fil & Ed)
• 16:08 Getting Helium in LVEA (Bubba)
• 16:18 Survey marks around the PSL Enclosure (Hugh)
• 16:39-17:12 CER check (Richard)
• 17:00 Slow Control/Beckhoff work in CER/LVEA (Daniel)
  • this brought back the IMC!  Yay!
• 17:15 TCS CO2y laser powered on now that slow controls back (Thomas)
• 17:30 High Voltage & picomotors enabled at EX (Richard)
  • EX Ring Heater REVERTED (gray)
  • HV turned ON for ETMx (kissel)
• 17:41 ETMy & ETMx Charge measurements (kissel)
• ~19:30 Took ISI Config to WINDY state.....
• 19:45 Squeezer cabling/electronics (Fil, Ed, and Richard)
• 19:54 Newtonian noise sensor removal (Elizabeth)----> She was able to remove 8 (of ~30).
• 19:55 Initial Alignment (after restoring X & Y suspensions)
  • PRM_ALIGN needed an init & a couple of attempts to work.
  • MICH_DARK_LOCKED didn't work, so BS was aligned by looking at AS AIR video & fringes of ASAIR_A_LF_DQ on dataviewer
  • SRC_ALIGN wouldn't lock, so misaligned SRM & tweaked on SR3  to center the spot the quad display of ASC-AS_C (under the ASC Overview medm).
  • Locking:  Having issue getting past the CARM_5PM step.
• 20:17 VOPO work in Optics lab (TJ, Travis)

This completes WP #7119 and WP# 7134.  

PT525 finally "woke up" when, by opening GV20, the X-end pressure changed by a factor of x10.  We have noted in the past how the new-to-us Bayard-Alpert/parani wide-range gauges differ from our traditional Cold Cathode gauges, both in magnitude and general behavior.  This difference is greater as the real pressure increases.  The Parani portion of the new gauges agree well with our traditional convection enhanced paranis but in the HV pressure ranges they are just "different".  We know that the CC gauges pump with about 1 or 2 l/s pump speed while the nude BAs don't pump.  For the conductance due to our arrangement of fittings, this can explain a difference between the two gauge technologies of up to 50% but not factors of 3, 5 and 10! 

The newest odd behavior shows up as a complete "lock up" of the gauge.  It gives valid but non-changing output in the example shown recently at the X-end (see attached graphs)  
 

 
Note:  In WP #7134, I mistakenly indicated that I was leaving the 1.5" valve which isolates GV20's gate annulus from the rest of the annulus piping "open" after opening GV20 and that this was a policy change.  In fact, I am leaving this 1.5" valve "closed", as is standard policy when the 44" gate is open.  I believe that the new, "Chandra era", change in practice applies only to when the 44" gate is closed for prolonged periods.  For this case, we will now be leaving the 1.5" open so as to eliminate the need to "dump" the un-pumped gate annulus volume into a temporarily connected aux. pump cart.  

J. Kissel

I've measured the effective bias voltage of the H1SUSETMX and H1SUSETMY ESDs in the traditional fashion (as measured by the zero in actuation strength [rad/V_S] from each quadrant reported by the optical lever). 
Excellent news: All Quadrants of ETMX ESD report 0 +/- 3 [V] effective bias voltage. AWESOME.
where, via the same, single-number metric (the mean and standard deviate of the weighted mean in all four quadrants, over two angular degrees of freedom), ETMX used to have 17 +/- 19 [V] effective bias voltage. Of course, you should look at the plots, since this single-number metric only works when all the weighted means of quadrants are very similar.

Note, however, this is a bulk measurement of all the ways that the ESD can be effected by charge. As Leo has discussed (see T1500467), and Sheila has recently resurrected (see LHO aLOG 38387), the force on the test mass is determined by 

    F_ESD = A (V_B - V_S)^2 + B (V_B - V_S) + C (0.5*(V_B + V_S) - V_R)^2 + D (0.5*(V_B + V_S) - V_R) + E 


where V_B, V_S, and V_R are the applied bias voltage, the applied quadrant control "signal" voltage, and the voltage of the surround cage components, respectively. A, B, C, D, and E are coefficients that depend on the geometry of the ESD pattern, the distance between the test mass & reaction mass, as well as the surrounding cage components (ring heater, EQ stops, fiber guards), and the polarizability of the test & reaction mass. This effective bias voltage measurement is a measure of a collection of all but one of these coefficients,
    V_eff = 0.25 (D - 2 C V_R - 2 B) /  (C - 4 A)

Once we recover the interferometer, Sheila and I will remeasure each coefficient independently, a. la LHO aLOG 38387, and BSC ISI excitations as in LHO aLOG 38132. Let's hope this has some impact on the sensitivity.

ETMY's effective bias voltage remains high (using the above metric, 51 +/- 34 [V]), but we're attacking the charge on that chamber next week. May we have the same amounts of success there!

Three cheers for Rai and the systems design team!

J. Kissel

For sanity's sake -- especially when trying to lock ALS COMM and DIFF by hand -- I've re-arranged the 
     /opt/rtcds/userapps/release/isc/h1/medm/ISC_GUARDIANS.adl
ISC Guardian Overview screen to align the ALS_XARM node control underneath the ALS_COMM guardian node control, and similarly, the ALS_YARM underneath the ALS_DIFF node control. The arrangment had been confusingly the opposite since the screen's inception, I think.

The update has been committed to the repository.

TITLE: 08/31 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Commissioning
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    Wind: 6mph Gusts, 4mph 5min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.16 μm/s
QUICK SUMMARY:

Kyle & Bubba are prepping for GV20 opening at EX (after work permit signed) this morning.

As of last night the game plan for the morning was also to have charge measurements run for ETMx and then start locking late morning/afternoon.

IFO Status:

• IMC unlocked for hours.
• Slow Controls/Beckhoff PLC1 crashed at corner station & EY. 
• ALS_YARM Guardian node still having issues (LOCK_ENABLE channel is listed as a DEAD & we have CONNECTION ERRORS).  Sent email to Daniel/Patrick.
• Other DIAG_MAIN messages for:  AS beam shutter open, ESD Driver OFF for X, Ring Heater X is off, TCS x & y laser powers are low & ALS X laser oscillating

Kyle, John 

Two additional discharge cycles, in addition to yesterday's single cycle, were completed by D. Sigg, J. Kissel and N. Mavalvala today.  Following the final gas admission, and with the X-end pressure at ~16 Torr or so and the TMDS port isolated, John and I decoupled the Surface Disharge Ionizer from BSC9 and installed a 2.75" blank in its place.  I then opened the 1.5" TMDS port gate valve and "burped" these few ccs of room air into the X-end vacuum volume.  This valve was then left open.  

I roughed down using the QDP80 to 0.5 Torr < pressure < 1.0 Torr before spinning up the Turbo.  This is the same approach as was used for the previous two pump downs.  

I am leaving the X-end on the Turbo overnight and plan to execute WP #7134 in the morning.  

Daniel, Marc, Paul, Fil

WP7133

Making good use of IFO down time today, we installed squeezer modifications to both Corner 4 and Corner 6 chassis.  In theory, this completes the squeezer modifications to slow controls in the CER.

TITLE: 08/30 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Commissioning
SHIFT SUMMARY:

Gate Valve for EX has been closed all day today for TMDS work.  This allowed for active work on the floor throughout the site.  The plan is to open EX gate valve in the morning, measure charge, and then try to locking H1 in the afternoon.  In parallel staging for TMDS at EY may happen tomorrow.
LOG:

• 14:33 EX TMDS work begins (Daniel, Jeff K, Kyle, Nergis)
• 15:55-18:55 EY BRS Centering (Jim)
• 16:50 Squeezer slow controls electrical modifications (Marc)
• 17:02 TCS X & Y CO2 Laser Out put off!
• 17:44 Squeezer cabling around HAM5/6 (fil & ed)
• 18:09 Survey work for HAM3 & HAM2
• 19:29-19:35 Conlog work: channels no longer used, removed (patrick)
• 20:00 EX TMDS Update:  2nd burp complete & pumping down for the afternoon.  Plan is to open gate valves in the morning.  Kyle still needs to go out there this late afternoon (after this shift).
• 23:02 LVEA entry (kyle)

J. Kissel, N. Mavalvala, K. Ryan, D. Sigg

We've successfully completed the third and final cycle of the Test Mass Discharge System on H1 SUS ETMY (BSC9/BSC5). 

All methodology and numbers ran very similar to the second session (LHO aLOG 38453), and the latter half of the first session (LHO aLOG 38430).
Because I was operating the knobs, my electrometer square wave voltage when measuring the ion "current" was 22.4 V (the maximum), instead of the previous runs in which Nergis measured with 12 V. After noticing the difference, we checked the electrometer's measured ion "current" at both 22.4 and 12 V, and measured similar values, so I stuck with 22.4 (cause it was easier just to crank the dial to max vs. find where 12 V was on the scope). See the attached notes for any further detail.

Also of note, we noticed about a factor of 2 (maybe 1.5) increase in electrometer-measured ion "current" (voltage) from +/-4.5 to +/-9 [Vp] when the TMDS system's scroll pump is ON vs. OFF (while the whole system is still valved off to the chamber). Maybe the scroll pump is sucking up ions from the electrometer? Still no explanation as to why we're getting a factor of 1.5 less "current" than LLO -- again, Ryan's report during their Jul 2016 TMDS run (LLO aLOG 35636, they were able to get upwards of +/- 12 to 13 [V]. Nergis suggests it's a function of calibration on the electrometer.

753 channels added. 8 channels removed. List attached.

I went back to EY again this morning and was successfully able to recenter BRSY this time. Because I was still a little sore from yesterday, I rethought my positioning at the viewport for the adjustment. I used the yellow stool from the ISC table and some foam to make myself a comfortable bench to lie down on and used the side of the stool to support my elbows. I also moved the workstation to the floor so I could see it more easily. Much better than curling up as small as I could, cross-legged on the floor for hours at a time.

Two things I still wish I had for this : a tablet or laptop that I could see the diagnostic plots on in the box so I didn't have to turn away from the viewport and a couple of padded c-clamps that I could use as wrist rests. I had one on the right side (this is clamping down the table for a co-located sts2) and my left shoulder is sore, I think from a combination of holding my left arm up and looking left continuously to see the diagnostic plots. Not a big deal for a couple minutes, but if you're camped out for a couple hours...

J. Kissel, N. Mavalvala, K. Ryan, D. Sigg

We've successfully completed the second cycle of the Test Mass Discharge System on H1 SUS ETMY (BSC9/BSC5). 

Operation went much more smoothly today that yesterday. We were open to the chamber sending ions in by 08:00a PDT, and valved out by 08:30a PDT. We decided only to go up to a BSC chamber pressure of 15 [Torr], partially due to person-power constraints, but mostly because the bulk to the ion neutralization happens when the TMDS is first valved in; as more clean air is in the chamber, the ionic mean free path to the test mass decreases. This should also help us a little on pump-down time. All other settings were identical to what worked well yesterday (see LHO aLOG 38430):
   - clean air flow rate of ~70 [L/min] (or "slm")
   - ion "current" (voltage) occasionally measured by the electrometer with high-amplitude square wave (12Vp amplitude) of +/- 8 [V]
   - pressures inside the TMDS of ~100 [Torr] as measured by the baratron
Attached are the raw notes (but they're not very exciting -- just 4 measurements of the ion "current" during the 1/2 hour discharge cycle).

Based on the current pump-down rate, we expect to perform our third and final cycle around 01:00p PDT today. 

Received "TCSX [& Y] CO2 laser output off" Verbal Alarms at 1702utc.  (this was followed by a timing system error Verbal Alarm for SYS-TIMING_C_GPS_A_ERROR_FLAG).

Attached is a 1-hr trend of the TCS CO2 lasers which show a glitch, but are still close to the powers they had been running at.

We started having timing errors about 10 hours after the conclusion of O2, and today we started having end station timing errors at the same time at around 16:30 UTC or 9:30 local time. It seems like the end station witness GPS units are not locked.

Sheila plans to come in and lock the IFO this afternoon, so that I can try to finish these detchar safety injections. I've schedule 7 injections, the first one will begin at 16:06:22 PDT, and the last at 16:51:22 PDT. Here is the update to the schedule:

1187824000 H1 INJECT_DETCHAR_ACTIVE 0 1.0 detchar/detchar_27July2017_PCAL_{ifo}.txt
1187824450 H1 INJECT_DETCHAR_ACTIVE 0 1.0 detchar/detchar_27July2017_PCAL_{ifo}.txt
1187824900 H1 INJECT_DETCHAR_ACTIVE 0 1.0 detchar/detchar_27July2017_PCAL_{ifo}.txt
1187825350 H1 INJECT_DETCHAR_ACTIVE 0 1.0 detchar/detchar_27July2017_PCAL_{ifo}.txt
1187825800 H1 INJECT_DETCHAR_ACTIVE 0 1.0 detchar/detchar_27July2017_PCAL_{ifo}.txt
1187826250 H1 INJECT_DETCHAR_ACTIVE 0 1.0 detchar/detchar_27July2017_PCAL_{ifo}.txt
1187826700 H1 INJECT_DETCHAR_ACTIVE 0 1.0 detchar/detchar_27July2017_PCAL_{ifo}.txt

The IFO should be left out of observation mode. Also, I'm not sure if the PCALX 1500Hz line gets turned back on, but this also needs to be turned off. Simply typing the following on the command line will do the trick:

caput H1:CAL-PCALX_PCALOSC1_OSC_SINGAIN 0
caput H1:CAL-PCALX_PCALOSC1_OSC_COSGAIN 0