Mid-Shift Summary

Nothing unusual to report. There was an EQ that caused some minor shaking:

08:35 DCPD glitch

09:18 incoming EQ from Phillipines 6.3

09:30 BLRMS starting to rise with P&S waves (1900+seconds to R wave arrival)

10:19 BLRMS maxxed at .7um/s. EX saturations but H1 rode it out well without having to change SEI CONFIG. No significant drop in range.

10:26 EX saturations

10:28 big DCPD glitch

Livingston went down ~40 minutes ago.

 

Shift Transition - Owl

TITLE: 04/22 Owl Shift: 07:00-15:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Observing at 109Mpc
OUTGOING OPERATOR: Travis
CURRENT ENVIRONMENT:
    Wind: 6mph Gusts, 4mph 5min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.12 μm/s
QUICK SUMMARY:

H1 locked. All is quiet environmentally. Geo, Hanford, and Livingston all in "Observing".

 

Ops Eve Shift Summary

TITLE: 04/22 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 110Mpc
INCOMING OPERATOR: Ed
SHIFT SUMMARY:  In Observe for ~4 hours.  No issues after relocking.
LOG:

23:17 PEM injections commencing

2:43 PEM crew to MX

2:46 Locked at NLN but in Commissioning mode for PEM injections

3:57 Observing

 

2 hours of PEM injections

Philippe Nguyen, Robert Schofield

This time we cut it close from the other side of a candidate: we delayed starting PEM injections until 10 minutes after a candidate (rather than ending 10 minutes before). Then we learned of the candidate and stood down.  When we were able to start again, we made acoustic injections in the LVEA and PSL, searched for the magnetic coupling site around HAM3 and made impulse injections on the input arm. We also injected at MX. Unlike last time, we did not see any coupling to DARM at MX, other than glitches when we banged the cryopumps - probably from particulate.

This brings us to a total of 12 Hours. We have several more hours of work to do, hopefully tomorrow.

Times (UTC):

21:47 – 22:15

23:20 – 0:28

2:53 – 3:20

Observing at 3:57 UTC

PEM crew done for the day.  At some point during PEM work, the SQZ lost lock.  I encountered the same problems and solutions detailed in Patrick's 48483.

Lockloss at 0:28 UTC

HTTS saturation alarm coincided with lockloss.  PEM crew was in LVEA at the time.

Ops Eve Shift Transition

TITLE: 04/21 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 110Mpc
OUTGOING OPERATOR: Jim
CURRENT ENVIRONMENT:
    Wind: 12mph Gusts, 7mph 5min avg
    Primary useism: 0.05 μm/s
    Secondary useism: 0.12 μm/s
QUICK SUMMARY:  Lock is 46 hours old. 

 

Shift Summary

TITLE: 04/21 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 109Mpc
INCOMING OPERATOR: Travis
SHIFT SUMMARY:
LOG:
21:47 Out of observing for PEM injections that were aborted for a while, back to Observe  at 22:15

 

Ops Owl Shift Summary

TITLE: 04/21 Owl Shift: 07:00-15:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Observing at 110Mpc
INCOMING OPERATOR: Jim
SHIFT SUMMARY: 38 hr lock, squeezer dropped its lock briefly once.
LOG:

• 1044 Out of observing, squeezer lost lock
• 1045 Observing

Ops Owl Mid Shift Report

Locked for 34 hrs. Briefly dropped out of observing because the squeezer lost lock, but it relocked with no issues.

Ops Owl Shift Transition

TITLE: 04/21 Owl Shift: 07:00-15:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Observing at 107Mpc
OUTGOING OPERATOR: Travis
CURRENT ENVIRONMENT:
    Wind: 19mph Gusts, 12mph 5min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.11 μm/s
QUICK SUMMARY: 30hr lock, wind is picking up slightly.

Ops Eve Shift Summary

TITLE: 04/21 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 107Mpc
INCOMING OPERATOR: TJ
SHIFT SUMMARY:  H1 locked for the entire shift and in Observing for ~7 hours post-PEM work.  ~30 hour total lock duration thus far.
LOG:

23:22 PEM crew to EY

0:10 PEM crew done

HVAC costs 3 or 4 MPc and 45 Minutes of PEM injections

Philippe Nguyen, Robert Schofield

We made a shaker injection at the corner station and several impulse injections at EY.

Also, I manipulated the HVAC. This was done during observation mode, as in the past, since we don't drop observing for automatic and other usual HVAC changes.  The figure shows that the HVAC is costing us 3 or 4 MPc. I then did a bunch of manipulations to narrow down the source. The dominant problem seems to be AHU 1,2 and 3, and, to a lesser extend, the turbines at the end stations. These are all running at higher rates than they were during O2. I will try do some further manipulations tomorrow to determine how much range we could get by going back to normal flows (my understanding is that they were increased for improved temperature control, I believe during the winter).

Here is the list of manipulations :

Switching all off. Begin: 16:35;  All off: 16:44

Switching all back on. Begin 16:59; All on 17:10

Switching all off: Begin 17: 22;  All off: 17:33

Switching all back on: Begin 17:48; All on: 17:57

Switching all off: Begin: 18:14; All off: 18:25

Switching all on: Begin 18:44; All on: 19:06

Switching off EY. Begin: 19:31; EY off: 19:39

Switching EY back on. Begin: 19:49; on: 19:55

Switching off CS AHU-3. Begin: 19:54; AHU-3 off: 19:55

Switching on CS AHU-3 and turning off CS AHU-1&2.  Begin 22:02; Complete: 22:03

Switching off CS chiller. Begin 20:13; off: 20:20

Switching on CS AUH-1&2 and chiller AND switching off EX. Begin: 20:25; Complete: 20:35

Switching on EX. Begin: 20:49; End: 20:51

Switching EX off. Begin: 21:06; All off: 21:15

Switching EX back on. Begin: 21:30; All on: 21:45

Switching CS AHU4 (office area) off. Begin: 21:57 Off: 21:58

Switching CS AHU4 ON and turning EX off. Begin: 22:06; Complete: 22:15

Switching EX on. Start: 22:31; EX on: 22:33

Switching CS AHU1,2,3, chiller off. Start: 22:50; Complete: 22:59

Switching CS back on: 23:07

Observing at 0:10 UTC

PEM crew done for the day.  Back to Observing.

Ops Eve Shift Transition

TITLE: 04/20 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Commissioning
OUTGOING OPERATOR: Jim
CURRENT ENVIRONMENT:
    Wind: 11mph Gusts, 8mph 5min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.14 μm/s
QUICK SUMMARY:  In Commissioning for PEM injections.  Lock is ~22 hours young.

Shift Summary

TITLE: 04/20 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Commissioning
INCOMING OPERATOR: Travis
SHIFT SUMMARY: Robert spent most of the day turning chillers and air handlers on and off
LOG:
19:00 Knocked out of Observe by PEM driven temperature changes, Robert was turning off chillers, this drove some ecat loops to make some SDF diffs

19:20 Knocked out of Observe again, when squeezer unlocked, possibly driven by temperature drifts from PEM stuff

23:00 Something dropped out of Observe again, but didn't catch waht it was, Robert was about to start more measurements anyway.

reinstating FMCS chiller alarm bypasses through to this evening

Robert is continuing his FMCS chiller tests. I've reinstated the alarm bypasses for the water pump status. With the warmer temperatures today, we got a supply over-temp alarm this morning, so I've added the supply channels to the bypass.

Bypass will expire:

Sat Apr 20 20:36:11 PDT 2019

For channel(s):

    H0:FMC-EY_CY_H2O_PUMPSTAT

    H0:FMC-CS_CY_H2O_PUMPSTAT

    H0:FMC-EX_CY_H2O_PUMPSTAT

    H0:FMC-CS_CY_H2O_SUP_DEGF

    H0:FMC-EX_CY_H2O_SUP_DEGF

    H0:FMC-EY_CY_H2O_SUP_DEGF

 

squeezer took us out of observe.

The squeezer took H1 out of observing at around 19:02 UTC, because the SHG PZT ran out of range.  The attached screen shot shows the PZT hitting it's rail, this is made using the ndscope called "Locking signals" linked from the SQZ overview screen.

The squeezer guardian tried to recover from this on it's own, but when it re-opened the beam diverter, no 3MHz signal showed up on the OMC DCPDs.  I cleared the history of the sqz ASC loops, after which everything locked up fine.  

I've made a function called turn_off_sqz in the squeezer manager guardian, which is called in several places where there was previously boilerplate code. I've added to this function to clear the history of the ASC loops after turning off the squeezer, this is loaded and will hopefully allow the squeezer to relock itself more smoothly in the future. 

noise budget update

This is a quick update on the noise budget injections that we did last week. The first attachment is the noise budget for a time with squeezing, the second attachment is for a time without. 

• To estimate the squeezing, I'm grabbing the data from the nonlinear gain monitor, which is the Q phase of the CLF diode normalized by the DC power on that diode.  This is proportional to the normalized nonlinear interaction strength x=sqrt(P/Pthreshold), and indicates that we had a nonlinear gain of 2 at the time.  The squeezing level is measured by a BLRMS normalized to the nullstream BLRMS at 4.68kHz, which reports 2dB of squeezing.  I'm assuming that the phase noise is 150 mrad, based on Nutsinee's measurements here: 47562 The noise budget then infers the losses based on the level of nonlinear gain and the measured squeezing level, in order to predict the anti squeezing level.  This is working OK for now, although the squeezing level is also limited by non-quatum noise which isn't taken into account.
• The PRCL injection does show up in the SRCL drive, but that is too small to account for the coupling to DARM, so it's added as a separate term again.  It also shows up in the out of loop frequency noise detector, but that is also small. (5th attachment)
• We are using REFL B9I to estimate the ambient level of frequency noise, similar to what was done here: 47351  There are nearly equal amounts of light on REFL A and REFL B, so the shot noise of REFL B will be causing this to be an overestimate of the frequency noise (by ~sqrt(2)) where it is refl shot noise limited.  On Tuesday I calibrated REFL 9I A into volts, so that we can compare directly REFL A+REFLB, this is shown in the 6th attachment. 
  • Upper left plot: Spectra in lock and with no light.  The whitening is different on A+B which explains the difference in the dark noise, REFL B is limited by ADC noise from 8-30Hz while we are locked, while for REFL A we must be limited by dark noise which is suppressed when we are locked.  In lock, at frequencies above ~1kHz where the loop is gain limited the two sensors agree.  According to Criag's modeling the frequency noise here is limited by the IMC detector shot noise.
  • Lower left shows the coherence between both sensors and DARM, with 1000 averages.  They are both coherent with DARM where the CARM loop is gain limited.  Where the frequency noise is limited by the REFL A shot noise, REFL B has more coherence with DARM than REFL A.  At these frequencies we could get slightly better frequency noise by summing the two detectors.
  • Craig is working on some modeling of the CARM loop that can be used to make a more accurate frequency noise projection, but for the time being the message is that our frequency noise is closer to DARM than it was before we increased the power. 
• For the ASC noise budget (third attachment), we also made injections for DC3+4 and INP1, but these don't show up in DARM for large excitations so they aren't included.
• The LSC noises are shown on their own here and the sum and residual are plotted in the last attachment.
• I'm using a logarithmic frequency vector, which makes the high frequency data look better than in past plots because of the binning.  This noise budget has never done a good job of estimating line heights, which is more noticeable now, especially if you look at the violin modes.
• I'm also now using the GDS correction calibration produced by pyDARM, instead of just compensating for the whitening of CAL-DELTAL, which helps the noise budget line up at high frequencies.
• The forest of lines around 20Hz is the ADS lines.

Some things that can still be improved in this noise budget:

• The PUM DAC noise hasn't been updated with the new measurements at LLO or the change in the coil driver state.
• A model of the CARM loop can be used to estimate frequency noise from the REFL A shot noise and the IMC shot noise separately.
• There are several other (smaller) noises that we have the data to include (DC readout upconversion, acoustic noise added by squeezer, frequency noise downconversion around the OMC dither line, PEM injection data) but aren't on here yet.
• There are some noises we haven't measured recently, like output jitter noise and any of the electrostatic noises.
• We can produce projections of the benefits of specific improvements from this.