J. Kissel

This is your weekly ETM charge measurement update! While charge continues to slowly accumulate on both test masses, I think we can begin to say that the rate of charge accumulation (as measured by effective bias voltage and L, P, and Y actuation strength) is slow enough on H1 SUS ETMY that we can get through the remainder of the run without flipping the ESD bias voltage sign, and retain low enough systematic error in the calibration model to stay within the desired 10%. However, one of the first things we should consider doing once the run is complete (after the calibration run is complete) is reducing the bias voltage by half to continue to slow the rate of charge. Oh, and H1 SUS ETMX continues to slow its accumulation rate thanks to our high duty cycle and turning of the bias when its not needed.

See attached images for depictions of the trends both in effective bias voltage and actuation strength in Pitch and Yaw (+ Longitundinal for H1 SUS ETMY).

I increased the power on the BS and SR3 oplev lasers this morning by ~5%.  I used the voltage read out of the "Current Monitor" port on the back of the laser (this port monitors the laser diode current, outputs a voltage).  The old and new values are listed below, as well as the new SUM counts.  Since I had to open the coolers the lasers are housed in they will need ~4-6 hours to return to thermal equilibium; at that point I can assess whether or not the glitching has improved.

• BS OpLev
  • Old voltage:  0.987 V
  • New voltage:  1.036 V
  • New SUM:  ~33500 counts
• SR3 OpLev
  • Old voltage:  0.889 V
  • New voltage:  0.933 V
  • New SUM:  ~40900 counts

I reset the 35W FE laser watchdog at 17:01 UTC (9:01 PST).

Activity Log: All Times in UTC (PT)

08:00 (00:00) Take over from TJ
08:10 (00:10) GRB Alert. IFO in Observing mode. Spoke to LLO
10:01 (02:01) Gerardo – Back from Mid-Y 
10:15 (02:15) Gerardo – Going back to Mid-Y
10:16 (02:16) Kyle – Called to check on problem with CP-3
10:17 (02:17) John – On site with Gerardo at Mid-Y
12:45 (04:45) John & Gerardo – Back from Mid-Y – leaving site
14:00 (06:00) Restart CS weather station code
15:30 (07:30) CP-4 is dropping N2. Percent down to 83%. Sent E-Mail and V-Mail to Gerardo 
16:00 (08:00) Turn over to Cheryl

End of Shift Summary:

Title: 12/22/2015, Owl Shift 08:00 – 16:00 (00:00 – 08:00) All times in UTC (PT)

Support:  Gerardo, John
 
Incoming Operator: Cheryl

Shift Detail Summary: Locked in Observing mode for entire shift. Take down IFO for start of maintenance window. 

There were problems with CP-3 (aLOG #24370, 24379) which Gerardo and John worked on. After Gerardo left CP-4 started to show dropping N2 levels as well. Down to 83%. Sent E-Mail and V-Mail to Gerardo. 

John, Kyle and Gerardo

One of the lines for CP3 pressure transducer appears to be plugged.
A first attempt to unplug it was not successful, for now we will continue to fill the pump manually and we'll continue to monitor CP3 level.  Alarms will continue for now.

   IFO locked in Observing mode for first half of shift. The range has been fluctuating between the mid 70s to low 80Mpc. Wind is calm to light (0 - 3mph). Seismic is quiet and centered around 0.07um/s. Microseism is flat and centered around 0.6um/s. 

   John and Gerardo continue working on CP-3 at Mid-Y.  

Received GRB alert at 08:10 (00:10). IFO in Observing mode although somewhat glitchy before the event. Spoke to LLO. 

Title:  12/22/2015, Owl Shift 08:00 – 16:00 (00:00 – 08:00) All times in UTC (PT)
	
State of H1: 08:00 (00:00), The IFO has been in Observing mode for approximately 24 hours. There was a drop out of Observing to Commissioning mode during the Evening shift to work on the RF45 problems. Power is currently at 21.9W, the range is around 78Mpc.    

Outgoing Operator: TJ

• TITLE: 12/21 Eve Shift: 00:00-08:00UTC (16:00-00:00 PDT), all times posted in UTC"

• STATE Of H1: Observing at 78 Mpc for 24 hours

• SUPPORT: Evan G, Kyle, John, Gerardo

• SHIFT SUMMARY: The begining of the shift was plagued by the RF45 noise, but that seemed to have dissapeared. There are been a some more saturations than usual, but I haven't seen the 45 noise ring up like before. Cryopump  3 at MY is reporting that it is 117% full, I have been talking to Kyle, John, and Gerardo and giving them updates. Gerardo just arrived on site to check it out.

• INCOMING OPERATOR: Jeff B.

• ACTIVITY LOG:

• 0:50 Vacuum alarm for CP3
• 1:45 Went out of Observing to see if anythign would help the 45 noise. Jeff changed the modulation depth and then brought it back.
• 1:53 Observing
• 7:44 Gerardo on site and heading to MY

• .
  

Seems as though the RF45 noise has left us around an hour and a half ago. We have had a few instances where we will get a few EMTY saturations in succession, but nothing that affected the DMT monitor at least.

Still locked and Observing at 77Mpc.

Laser Status:
SysStat is good
Front End power is 30.75W (should be around 30 W)
Frontend Watch is GREEN
HPO Watch is RED

PMC:
It has been locked 27.0 days, 8.0 hr 21.0 minutes (should be days/weeks)
Reflected power is 1.644Watts and PowerSum = 24.72Watts.

FSS:
It has been locked for 0.0 days 18.0 h and 48.0 min (should be days/weeks)
TPD[V] = 1.505V (min 0.9V)

ISS:
The diffracted power is around 8.035% (should be 5-9%)
Last saturation event was 0.0 days 18.0 hours and 20.0 minutes ago (should be days/weeks)

 

I received an alarm in the control room here at 00:50 UTC (16:50 PST) for the MY Cryo Pump 3. The fill percent jmped up to 120% and has since been very slowly trending down (currently at 117.6% at 17:42). Kyle, John, Bubba, and Gerardo have been notified and are monitoring the situation.

Trends below of CP3 and CP4 for the HVE-MY:CP{}_LIC and HVE-MY:CP{}_LT channel for the a few hours before the excursion.

• TITLE: 12/21 Eve Shift: 00:00-08:00UTC (16:00-00:00 PDT), all times posted in UTC"

• STATE Of H1: Observing, locked for 16 hrs

• OUTGOING OPERATOR: Jim W

• QUICK SUMMARY: RF45 is back!!! the past 2 hours os so the IFO has been plagued by the RF45 noise. There are people in the control room investigating but in the mean time I guess the plan is to stay in Observing and just make sure that the data is flagged.

• Wind <20mph, useism 0.8um/s, PSL 21.9W, CW inj running.

TITLE:    Dec 21 Day Shift 08:00-16:00UTC

STATE Of H1: Observing, RF45 is acting up

SUPPORT: Typical control room crowd

SHIFT SUMMARY: I took over for Cheryl at 21:30, thing were quiet until RF45 started acting up at 23:30, still in observe, but data is obviously bad

ACTIVITY LOG:

21:20 JeffK Running pcal to darm tf, llo calls to say they are at dc readout, done 22:30

22:00 Bubba to Mid-Y, back 24:00

45 MHz stabilization started gitching circa 23:15:00 Z.

This was accompanied by a drop of a few percent in AS90.

Nothing is visible in the spare amplitude demod on the ISC rack (23567). Noise appears stationary with an rms of a few millivolts, meaning the RAN of this glitch at the ISC rack (not including the EOM driver chain) is less than a few parts in 10⁵.

Attached are 7 day pitch, yaw, and sum trends of all active H1 optical levers.