Attached are plots of the cooling related signals from around the time of the laser trip on ~midday Sunday.
The minimum head flow rate was set to be 0.5 lpm as a precaution because the front end and power meter circuit
flow meters were disabled.

    From the XChilFlow_v_Head4 plot it looks like the flow rate in head 4 was down on its way beyond 0.5 lpm
and then the crystal chiller shutdown, as it was supposed.  The plots {In,Out}letPressure_v_Head4Flow show the
pressures in the water manifold at the same time.  The pressure oscillations occur as the chiller was shutting
down and not before it.

    XChil_v_H4, {In,Out}P_v_H4 are plots for the Sunday afternoon laser trip. Again consistent with the flow
rate in head 4 dipping below the trip threshold.

Removed check valve from CP4 exhaust and installed a thermocouple up inside the pipe several feet. Signal is being read out via H0:VAC-MY_CP4_TE252B_DISCHARGE_TEMP_DEGC. 

Tomorrow I'll overfill CP4 and collect temp data.

Kiwamu Daniel

With ISS PD A mounted in the main path we measured the spectrum of the second loop ISS. The attached plot shows a clear improvement in the signal sent to the inner loop ISS. The red curve is a representation of the new control signal, whereas the dark red curve is representing the old configuration. The second loop out-of-loop sensor also sees improvements (black against gray) between 600 Hz and 4 kHz. The jitter out of the HPO is unchanged. The measurements were done at 54W into the IMC.

WP 6234
FRS 4504

Installed D1300642 HWWD electronics for ITMX and ETMX. Units installed in monitor-only mode.

1. Units were powered up
2. DB37 cables connected
3. DB9 cable connected from HWWD chassis to binary input chassis
4. Three BNC cables were pulled to SEI ISI coil drivers

ISI coil drivers need to be replaced with modified units that will enable the HWWD electronics to power off the coil drivers.

Serial numbers of units installed.
ITMX - S1500333
EX - S1301706

Peter, Kiwamu,

We have taken out the PD A photodiode out of the ISS inner loop box and placed it at a location where the PWR_EOM photodiode was. We confirmed that we can close the loop with the moved PD A.

[New setup]

We opened up the inner loop box and removed the base plate on which the two photodiodes sat. Then we took out only PD A from the base plate while leaving PD B mounted on the base plate. We put the base plate back into the inner loop box. A black glass beam dump was placed at the location where PD A used to be. Careful: because we could not find a good screw hole, we could not clamp down the black glass beam dump which is currently just sitting on the base plate.

We placed PD A to the location where PWR EOM (Thoralbs PDA55) had been. We rerouted all the associated cables for PD A (a 5 pin lemo, 2 normal lemos) to the new location. We measured the beam power at this location to be 8 mW. Because this is too much for PD A (which we think typically runs with 1 mW), we installed an ND filter on the front panel of PD A (see the picture).

A few more pictures are available at ResourceSpace.

[ISS loop closed with PD A]

Here shows a screenshot of the setup for closing the inner loop with PD A. The gain slider needed to be a 12 dB higher (which still smells like a factor of two calibration error...) than the usual. The ref signal for PD A needed to be -0.46.

Intend to confirm that CP3 isn't overfilling following today's delivery via observing absence of vapor at exhaust at some point before leaving today (It's similar to a sentence - only without all of the unnecessary comprehension!)

State of H1:  in Maintenance, 18 Work Permits in progress / done

Activities: (Corey 8:00-10:38(15:00-17:38UTC))

• 8:00 LVEA Cleaning (Christina, Karen)
• 8:16 Transitioned EX & EY ISIs to "VERY_WINDY_NOBRSXY" in prep for Maintenance
• 8:22 EY to LASER HAZARD
• 8:22 PCal EY work (Travis/Pcal Crew)
• 8:25 Turbo pump controllers energizing (charge batteries), maintenance (Kyle)
• 8:43 -11? EY Vent/Purch air skid work (WP6241)  (Kyle & gerardo)
• 8:33-8:50 COMPUTERS FROZE!  (Batch & Richard looking?)
• 8:45 Cleanroom curtains, HAM3/4 (Jeff)
• 8:48 Contractor for mats
• 9:09 SEI model work (Hugh, 6217, 6227)
• 9:00 PSL (Daniel, WP6239)
• 9:14 PSL Room work (Peter, Kiwamu)
• 9:40 LN Truck at CP5 & CP3
• 9:40 Gate Valve Measurements (Chandra)
• 9:52 King Soft for RO work (Bubba)
• 9:45 Check PSL DBB shutter (Richard)
• 10:11 Paradise Water 
• 10:16 quick PSL ODC work (Jason)
• 10:08:  TCSx CO2 laser & Xand Y Chiller alarms---not sure why???  (Daniel & Jason checking)----> Jason brought back 
• 10:38 DAQ Restart

As of 18:00UTC (11:00PT) Work in progress: (Cheryl)

•  1  6234         LVEA/EX    filiberto.EE                    hardware WD elec                 x202   00:00:36
•  2  6228         EY     travis.pcal                           PCal work                 x239   00:02:09
•  3  6241         EY            kyle                 vent purge air work                 x239   00:00:14
•  4   n/a            PSL    peter.kiwamu                       PSL room work                 x113   00:00:53
•  5  6232         CDS        jonathan                    framewriter work                 x202   00:02:36
•  6   n/a            MY    liquid.nitro                            CP5 fill                 x202   00:00:38
•  7   n/a            LVEA  jason.oberling       check TCSx laser and chillers                 x202   00:00:56
•  8  6236         LVEA     dave.barker                         SUS WD work                 x202   00:01:16
•  9  6238         LVEA    dave.darkhan                        CALCS update                 x202   00:01:17
• 10  6234       EY/EX    filiberto.EE                    hardware WD elec                 x202   00:02:19
• 11   n/a          MY    liquid.nitro                            CP3 fill                 x202   00:01:23
• 12  6239        PSL-ISS           DB+DS            psliss code, DAQ restart                  255   00:03:29
• 13  6235        PSLDBB-LSC           DB+DS    dbb and lsc restart, daq restart                  255   00:03:30
• 14  6240        DAQ           DB+DS    restart DAQ for Beckhoff changes                  255   00:03:31
• 15  6231        DMT-GDS           JohnZ                     upgrade GDS DMT                  255   00:03:34
• 16  0000        lvea           bubba                                3ifo                  202   00:01:44
• 17  0000        lvea     betsy-jason                     tcsy-water-leak                  202   00:01:57
• 18  0000        lvea    richard-mike                  check-voltage-popA                  202   00:01:57

Activities Since (UTC):

• 18:37 - 6229 cds dave-kiwamu tcs-code-upgrade - done
• 18:40 - 6239 cds dave-daniel ISS-code-upgrade - done
• 18:42 - 6244 cds richard-mike popx-whitening-test-swap - no swap, connection/cable
• 19:13 - 6231 DMT-GDS JohnZ upgrade GDS DMT - done
• 19:13 - VAC - Gerardo - pimps in LVEA turned off
• 19:18 - 6241  EY kyle vent purge air work - done
• 19:21 - 6242 cds carlos migrate-software - done
• 19:21 - 6244 cds richard-mike popx-whitening-test-swap - hardware is done for now, handing back to Daniel
• 19:44 - REFL - Daniel - check signals
• 19:45 - 6234 EY/EX filiberto.EE hardware WD elec - done
• 19:47 - 6236 LVEA dave.barker SUS WD work - done
• 19:49 - LVEA  jason.oberling check TCSx laser and chillers - done
• 19:49 - lvea  betsy-jason tcsy-water-leak - done
• 20:00 - DAQ restart
• 20:00 - 6244 cds richard-mike popx-hardware - back out
• 20:07 - DAQ restart
• 20:14 - 6239 psl kiwamu measure-iss-loop - done
• 20:14 - lvea daniel refl - back
• 20:24 - lvea daniel refl

Work that continues:

•  REFL - Daniel - LVEA
•  Pcal - Rick/Travis - EY

I selected nine periods of ten minutes during last night's locks (see fig. 1). For each period I computed the transfer function from jitter (as measured by the diagnostic brteadboard Q1Y signal) to DARM. The second figure shows that the coupling indeed changes over time. 

I used the period martked as (4), which correspond to the largest coupling, fit a transfer function and used it in the time domain to perform jitter subtraction for all nine periods. The third figure shows the reduction in DARM noise: clearly the filter works well for period (4), but the performance is significantly degraded for the other periods.

In conclusion, if we want to subtract the jitter noise, we'll need some level of adaptive filtering.

After Jason had to fill the TCSY chiller this morning he and I decided to make another round of water leak inspections.  We "poured" (pun intended) over the inside of the table enclosure, including removing a few table panels in order to carefully look behind some things.  We found no water leaks.  We then crawled the LVEA length of piping under the chambers and up to the wall junction and also found nothing.  We inspected the flow meter area under BSC2, nothing.  And so we keep filling a bit every dayish...

J. Betzwieser, D. Barker, D. Tuyenbayev,

Overview

Updated the h1calcs model to include modifications from LLO, restarted the DAQ system (LHO WP #6238). Now H1 and L1 are running the same version of the CAL-CS model.

Details

• CTRL_DELAY filter bank was added to the DELTAL_CTRL signal path, before the summation with DELTAL_RESIDUAL (see LLO alog 28268).
• Reverted some modifications to BUFFER_AND_AVERAGE.c, currently using version of the script in CDS SVN r14393 (see LHO alog 30293).

After the DAQ restart the coherence calculation settings were changed to:

Number of averages: H1:CAL-CS_TDEP_COH_BUFFER_SIZE 13
Seconds between averages: H1:CAL-CS_TDEP_COH_STRIDE 10

The new CTRL_DELAYfilter is currently empty (unused), and the DELAY_CYCLES (ring buffer / integer delay cycles) is set to 7.

The synchronized oscillators in the CAL-CS time-dependent parameter and coherence calculations were restarted manually. This is a necessary step to get correct phases in the oscillators after a model restart (a bug is described in LHO alog 30220).

WP 6235:

We added a feedforward path from the DBB QPDs to the LSC DARM or LSC REFL_DC_BIAS. There are new filters name H1:PSL-DBB_FF_QPD1X, 2X, 1Y and 2Y, followed by a matrix H1:PSL-DBB_FF_QPDMAT. Then the signal is sent to the LSC model, where there is a filter module H1:LSC-JITTERFF followed by an output matrix H1:LSC-JITTERFF_MAT. The signal is then added to either the DARM error point, or sent to the REFL_DC_BIAS output.

In the LSC model the temporary third loop ISS which is now defunct was deleted and the EXTRA_AO_3 path restored. The hardware was also disconnected.

We also noticed that the REFL_DC_ERR and COMM_A_RF_ERR paths were swapped. The same was true for REFL_A_RF9_ERR and REFLAIR_A_RF9_ERR. They should be correct now. The REFL_DC_BIAS output is directly connected to the REF_DC_ERR input. If we need dewhitening we should switch this to the excitation input.

WP 6239:

The model part for the second loop ISS QPD was changed to one which supports the whitening filter switching.

I restarted the primary and redundant calibration pipelines at Hanford at gps time 1160244770. Based on tests, the current latency is ~5-7 seconds. This restart picked up the latest release gstlal-calibration-1.0.5, with bug fixes for a "time-reversal" errors and (hopefully) the overlapping frame bug. The filters file used can be found in the calibration SVN:

aligocalibration/trunk/Runs/PreER10/GDSFilters/H1GDS_1159648300.npz

The new filters contain the updated calibration line frequencies, so the kappas should be correctly computed once we enter a lock stretch. For more information on the filters, see this aLOG:

https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=30210

Below is the command line used to run the pipeline:
gstlal_compute_strain
        --data-source=lvshm 
        --shared-memory-partition=$LIGOSMPART 
        --filters-file=$filter_file 
        --ifo=H1 
        --frame-duration=4 
        --frames-per-file=1 
        --write-to-shm-partition=$HOFTSMPART 
        --compression-scheme=6 
        --compression-level=3 
        --control-sample-rate=4096 
        --expected-fcc=341.0 
        --partial-calibration

To remove missing ISI & HEPI DACKILL widgets--WPs 6217 & 6227.  SUS & IOP DACKILLs not touched.

ECR E1600042 WP 6217; ECR E1500325 WP 6227

To Remove DACKILL elements from HAM ISIs and HEPIs:

HAM ISI

.) Removed DACKILL Widgets on WD Block--Attachment 1.

.) Removed DACKILL link from WD Block to the ERRMON Block--Attachment 2.

.) Routed WD_STATE from WD Block to ERRMON--Attachment 2.

.) Added WD_STATE Logic in ERRMON Block for Rogue Excitation Evaluation--Attachment 3.

HEPI

.) Removed DACKILL elements from HEPI (Top) Level--Attachment 4.

.) Removed DACKILL parts  on WD Block--like ISI Attachment 1.

To update HEPIs to Bleedoff-Accumulated-Saturations feature running on ISIs for months:

.) Add WINDOWTIME inputs on HEPI WD Block--Attachment 5.

.) Removed Test Point pickoffs WD Flag channels--also on Attachment 5.

.) Replace model saturation counter on WD/IPS, L4C & ACT Blocks with WD_SATCOUNT_vb.c counter & bleedoff Function--Attachment 6 becomes Attachment 7, e.g.

JimB restarted all these models after the build and install.  Reisolation was not a problem.  HAM2 did have one trip on CPS during 1st isolation attempt but it worked fine on the 2nd...

SVN COMMITS:

/opt/rtcds/userapps/release/isi/common/models/

hugh.radkins@opsws1:models 0$ svn commit -m "Removed DACKILL remenants & wired WD_STATE to ERRMON"
Sending        models/isihammaster.mdl
Transmitting file data .
Committed revision 14424.

/opt/rtcds/userapps/release/hpi/common/models

hugh.radkins@opsws1:models 0$ svn commit -m "Added sensor/actuator WD Saturation Bleedoff ala ISI & removed Test Point WD Flag channels"
Sending        models/hepitemplate.mdl
Transmitting file data .
Committed revision 14425.
 

Still have some medm and SDF cleanup to do.  In progress.

Corey informed me that he was getting low water level alarms on the TCS chillers.  I went out to investigate and found the following:

• TCS-X
  • No additional water required, water level 29.0
• TCS-Y
  • Found water level at 4.0; added 350 mL water to raise the water level to 9.0

WP6240:

The TwinCAT code has been updated on all interferometer Beckhoff machines. Three new features were added related to error reporting:

• The picomotor controller can now be set to nominally off. With this we can rise an error flag, when the controller is on.
• The LO level test for the demodulators can now be disabled by setting the nominal value to -100 dBm. This allows to disable the test for unconnected spare channels which tended to drift around.
• The tolerance on the EOM drive power readback has been increased to accommodate the 9MHz driver.

The svn version on the end stations is 3185, whereas the corner is 3186.

At the request of DetChar, I have reviewed the LHO PSL ODC thresholds for relevancy now that the HPO is operating.  The threshold for Bit 12 (PMC Transmission Limit OK) was still set to 11.5W, which was ~50% of the PMC transmitted power during O1 but is now too low for an operational HPO.  Keeping the 50% of output intact, I changed the threshold to 50W; I chose 50W as that is roughly 50% of our current 101W transmitted by the PMC.  I accepted the change in the PSL PMC SDF.

This completes WP #6243.