WP7196, DCC-T1700481, ECR-E1700367, FRS-9309

Brian, Jim, Dave:

h1isi[etmx, etmy, itmx, itmy, bs] models were compiled and restarted. Their DAQ channel lists increased by six slow channels each (example list for ITMY shown below).

The isi2stagemaster.mdl was modified. It now uses C code in the file ISIWD_LONGDAMP.c in place of ISIWD_GPS.c

+: slow channel H1:ISI-ITMY_ST2_WD_MON_RESET_PENDING added to the DAQ
+: slow channel H1:ISI-ITMY_ST2_WD_MON_HOLD_REMAINING added to the DAQ
+: slow channel H1:ISI-ITMY_ST1_WD_ST1_FLAG_GEN_DELAY_TIME added to the DAQ
+: slow channel H1:ISI-ITMY_ST1_WD_ST1_FLAG_GEN_DELAY_TIME_MON added to the DAQ
+: slow channel H1:ISI-ITMY_ST1_WD_MON_RESET_PENDING added to the DAQ
+: slow channel H1:ISI-ITMY_ST1_WD_MON_HOLD_REMAINING added to the DAQ
 

We have added a couple of convenience functions to LDVW that might be of interest.

BRUCO (brute force coherence) written and maintained by Gabriele Vajente,

WDQ (omega scans on a standard list of channels) uses either the Matlab W pipeline maintained by Brennan Hughey or dmt_wscan written and maintained by John Zweizig.

LDVW provides a simple web interface that launches a condor job to run these processes. Results are available on the leas-jobs machine at CIT.

BRUCO interface is available at https://ldvw.ligo.caltech.edu/ldvw/Bruco
WDQ is at https://ldvw.ligo.caltech.edu/ldvw/Wdq

If any part of the interface is counterintuitive or you have any trouble running please contact me at joseph.areeda@ligo.org

J. Kissel

I'm headed into the optics lab to tune the Bounce / Roll Dampers (BRDs) for ITMX, so I want to reconfirm the measurements of the highest vertical (a.k.a. "bounce") and roll modes of the newly suspended ITMX. The previous measurement of the highest vertical & roll modes (LHO aLOG 39106) was taken while the SUS was still rubbing all over and poorly aligned. Travis and Betsy worked hard yesterday to find that the majority of Top to Top mass transfer functions were clean (barring a believed malfunctioning F1 sensor); aLOG pending. 

The results are reported below (and ASDs of the PUM/L2 and UIM/L1 stage are attached). 

Meas Date     2017-10-20      2017-10-31
V4 [Hz]         9.8022          9.8056
R4 [Hz]         13.927          13.927

The frequency bin width of both measurements is 0.5 mHz, and the effective bandwidth is 0.732 mHz.

The bounce frequency has increased ever-so-slightly (9.8056 - 9.8022)/9.8022 = 0.00035 (i.e. 0.03% increase), but the roll mode remains the same. Given our ability to tune the BRDs is at the 1% level, I expect / will be happy to get something between the 9.8056 .* (1 + [0.01 -0.01]) = [9.9037 9.7075] range.

This morning I completed the weekly PSL FAMIS tasks.

HPO Pump Diode Operating Current Adjust (FAMIS 8446)

With the ISS OFF, I adjusted the operating current of the HPO DBs, changes summarized in the below table.  A screenshot of the PSL Beckhoff main screen is attached for future reference, as usual.

DB operating temperatures remain unchanged.  The HPO is now outputting 155.1 W, and the ISS is back ON.  This completes FAMIS 8446.

PSL Power Watchdog Reset (FAMIS 3674)

I reset both PSL power watchdogs at 16:49 UTC (9:49 PDT).  This completes FAMIS 3674.

Yesterday, Travis found the mechanical rubbing point on the ITMY - we ran a few short TFs and things look much more suspended.  The beam still is on the oplev, I made some small bias adjustments to center it up, but we should be ready for a full suite of TFs as only cleaning is left to do on this unit, which won't happen until closer to closeout.

TITLE: 10/31 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    Wind: 9mph Gusts, 7mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.15 μm/s
QUICK SUMMARY:

Richard came into my office this morning to tell me that the laser was off.  Pulled up the laser status
screen to find that power watchdog was activated ~12 hours 20 minutes ago (~6 pm Monday).  The laser
was brought back.

J. Kissel

I've B&K hammered the response of a bunch of other stand-alone components in HAM2: New MC13 Table Baffle, PSL DownPeriscope, MCREFL Periscopes, and New ISI Table Baffles. The prognosis is not good. Every component aside from the PSL down-periscope has resonant features below, if-not-well-below 150 Hz -- the original requirement from the SEI team to keep ISI 30 Hz UGF control loop design possible. Granted, the MC REFL Periscopes haven't really changed, but this data shows that (a) they are different from each other, and (b) that Periscope 2 is confirmed rattly mess. I can only hope that we can some how stiffen & and damp, instead of just shoving viton everywhere. I fear it's far too late in the schedule...

This being said, I must give props to the SLiC design team for ramming through an incredibly quick design-to-installed turn-around, and I appreciate that not everything could have been thought. We know from LLO that all this new baffling is doing the right thing as far as scattering goes.

See the .pdf for transfer functions.

I'll note that *everything* I hammered in HAM2 (including PRM and PR3 from LHO aLOG 39212) shows these resonant features at ~10.6 and 12.4 Hz. However, the ISI table baffles (a.k.a. beard baffles) seem to show this feature more prominently, and their mounting looks ... less-than-stiff ... so my guess is that since the accelerometer is mounted to the table in these measurements, they're coupling to every measurement. BUT, this is just a guess. I have a tough time believing that there's enough moving mass in those baffles to resonate as low as 10-12 Hz.

Aside from this common feature, I list the remaining prominent low-frequency features here in tabular form for future reference:
    DOF                       IFO Y                                    IFO X
    MC1/3 Table Baffles       [21.5 29.38 44.62]                       [29.62 36.88]
    PSL Down Periscope        [238.4]                                  [269.8]
    ISI HAM2 Table Baffle     [12.38 40 60.75]
    MCREFL Periscope 1        [124.6 124.8 140.8       194.6]          [22.00       42.25 141.2 167.9 195.1 ]
    MCREFL Periscope 2        [31.75 124.6 142.6 167.8 201.4 285.0]    [22.38 31.25 48.12 143.5 167.6 201.6 223.6]

Pictures are attached to guide discussion and aide any repeat measurements in the future.

• PSL beam aligned to the IMC using the new MC1 iris
• MC1 and MC2 alignment slider values are within 40urad of previous values
• MC3 alignment sliders have changed significantly
  • BEFORE: Pitch slider: -3911, Pitch OSEM: -3606, Yaw slider: -490, Yaw OSEM: 500
  • AFTER:    Pitch slider: -461, Pitch OSEM: -874, Yaw slider: --2260, Yaw OSEM: -1356
• alignment snapshots attached

- Ed, Keita, Cheryl

[Spelling Ed from DAY Ops Shift duties so he can join IO Team for HAM2 activities.]

Afternoon's Activities:

• 19:34 Transitioning LVEA to Laser HAZARD (Keita)
• 19:35 Monthly Hanford Testing automated call received
• 19:35-22:40 IO Team heading out to HAM2 (Cheryl, Keita, Ed)
• 20:08 ITMx (BSC3) work cont. (Betsy, Travis)
• 20:39 BRS EX upgrade work (Krishna)
• 20:55 OFI work cont (Gerardo, Peter K)
• 21:06-22:15 Ion Pump cable short circuit test at Y2-8 (i.e. ~250' from EY) [Kyle, Chandra]
• 21:06 HAM4 Baffle Work & LVEA part search (TJ, Jim)
• 21:08 "Noise Eater Out Of Range" 
• 22:15 MY Trip (Kyle)
• 22:40 LVEA is Laser SAFE (Cheryl, Ed)

Kyle R., Chandra R. 

Previous attempts to test for a high voltage cable connector short circuit were to no avail as the ion pump controller wouldn't energize the cable without the cable connector being mated to the pump connector (SHV Safety Interlock).  Today we defeated this safety interlock by disconnecting the HV connector from the pump and installing a mating-sex connector in place of the pump connector.  By doing this, the mating-sex connector depresses a spring contact within the HV cable connector and "fools" the controller into thinking that the cable is connected to a grounded ion pump.  Anywhoooo....this approach worked and the non-terminated HV cable would now energize.  The result was confirmation that the short circuit is, in fact, internal to the pump-end HV cable connector as the controller's output was power limited, 700V @ 0.5 amps, while not connected to the ion pump.  

As such, we'll ask the EE/CDS folks to redo this pump end HV connector as they have a much better track record of doing this successfully than we do!  

S Cooper, J Warner

I've been using a particle swarming script developed by Conor, to design some sensor correction filters in different environmental conditions., the method used by the script is described in G1700841. 

I chose a starting point of GPS time 1193385618 (8AM 30th October 2017 UTC) and used data for 2 hours on ETMY. During this time the microsisem was around 0.2-0.3 um/s and the wind speed was around 10m/s. I configured the swarm to have 4000 particles, set the RMS counting from 2Hz down to 1mHz, set minimum and maximum Q's to be 0.05 and 5 respectively and set the gains to range from 0.95 and 1.05. The result of this swarming produced the filter shown in blue in the first plot and its complement in red, plotted against the sensor correction filters currently used (Filter Module 5 CML BB). 

For these conditions, on this chamber the ending velocity RMS (how we're measuring how well the filter performs) is basically equal to the sensor correction filter currently used. Nevertheless Jim and I will try this filter out on ETMY and see whether this has any problems / benefitsover the old filter overnight on ETMY.

II 1127 & WP 7195

Returned the model to nominal configuration to allow testing/troubleshooting of the rogue excitation problem associated with the C2 coil driver.

Filters are changed and after a couple weeks of circulating just up at the Pump Stations, the valving has been returned to allow flow through the LVEA piping.  The Actuators are still isolated from the flow and I'll keep the system like this for at least a week or so to further bleed the piping and clean the fluid.  Can't really do any testing until the HEPIs are unlocked so there is no rush to open up to the actuators.

The parts in question are D1101911 & D1101910.

HAM2: I've installed a QPD cable strain relief on IM4 trans. See first attachment.

HAM3: Done with MC2 trans and POPB, but not POPA.

For POPA, 1/4-20 screw wouldn't go in easily (I only tried for a minute or two) and I didn't bother to keep trying because I remember that this was a problem in the past for some of the QPDs (alog 19168 for TMSX).

One set of parts is left on the wire shelf on the work table in HAM2 cleanroom (top right of the wire shelf). If the 1/4-20 wouldn't cooperate, I would recommend to do the same solution as the above alog entry.