Today, Travis swapped out the problematic AOSEM (FRS Ticket 5058)

A quick check of suspension freedom, we did a top stage V and L TF which showed reasonably placed peaks.  A full suite is likely up next, as well as a check of actuation (maybe falls out with TFs).

WP7161: Dan, Dave:

Today we are upgrading the second frame writer system (h1fw1/h1ldasgw1) from SATABOY-RAID to E18-RAID.

Remember that we had upgraded the fw0 system back on 18th October, that system has been accumulating full and second trend data since that time. The default NDS is h1nds1, so this change was transparent to the control room.

Today's change will be more intrusive to the control room. In preparation for the upgrade, I have reconfigured h1nds1 (default NDS) to mount h1ldasgw0:/frames-0 file system. The nds was down for about 10 minutes while this was done.

We will now power down h1fw1 and h1ldasgw1, disconnect the two SATA-BOYS, connect the E-18. Build a file system on the E-18. Connect one of the SATA-BOYS and build a file system on it customized to its function as a raw-minute-trend archive server.

h1nds0 (guardian's NDS) is unaffected by today's work.

• Topped off the Crystal Chiller with 325mL of water (Note:  for 10/25 it required 150mL).
• Diode Chiller did not need water (no Alarm light).
• Canister Filters "white & free of debris".

Attached are screenshot for BSC & HAM CPS spectra.  Nothing notable for high frequencies.

Fairly quiet so far.  (although the useism has taken a step up in last 18hrs & we continue to have sizable EQs over last few hours). 

LVEA Zone Temperature StripTool looks fairly normal/flat around 20.1degC for last 43hrs.

Went through most of the Ops Checksheet with nothing to note.

DOE Ground Water Services was on site yesterday morning to perform annual testing of our well. I had to manually run the well for ~ an hour which is longer than I expected and as a result, I overfilled the well tank. There is a high level alarm sounding in the maintenance building but it is nothing to be concerned with, the annoying alarm will silence when the level drops. 

IO alignment is complete, until final check, and until after a fix for IM2 and IM4:

• IMC input beam alignment checked on MC1-MC2 path - OK
• IMC flashed - alignments recorded (posted later)
• IMC trans alignment checked - OK with IM alignment sliders zeroed, except IM2, which has a +2000 slider value
• PRM transmitted beam alignment was as expected - high on that iris
• the beam on PRM trans is high due to a -4000-ish pitch misalignment of IM4 when the alignment slider is set to zero
• hardware adjustment will be used to correct IM4 pitch pointing
• IM2 suspension wire needs to be backed off from a metal part
• two IRIS markers to be installed in HAM2
• all temporary hardware to be removed tomorrow for ISI rebalancing

Other IO changes to the HAM2 payload:

• ECR to swap IO dog clamps to SUS dog clamps on IMs submitted yesterday (only IM4 at LHO, all IMs at LLO, and plans changed accordingly for 3IFO)
• due to the weight difference in the dog clamps, it would be advisable to do before rebalancing, though ECR is not yet approved
• SUS dog clamps to be installed are D1100641V2 type 03, and D1100641V2 type 02

I've updated the BSC-ISI model in the repo and it is ready for installation. - HAM-ISI model is still pending (should be very soon).

Following requests from Jim, Sheila, et al, this change will update the BSC-ISI watchdog to make the ISI more robust during earthquakes. We have changed the model to increase the hold-the-damping-on-even-if-stuff-is-saturating time from 3 to 60 seconds.

The updated model is in the userapps repo at SVN revision 16398

Installation instructions and more technical details are in technical note T1700481.

The approved ECR is E1700367

and the FRS is 9309
 

I've not pulled work permits.

-Brian

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

Day's Activities:

• Continuing Activities:  (1) EX BRS work (Krishna/Jim), (2) ITMx work cont (Betsy), (3) Optics lab (OFI?) work (Gerardo) 
• 17:18 Liquid Nitrogen truck for MY's CP3 (#74)
• 17:19 Transitioning to Laser HAZARD (Ed)
• 17:20 HAM6 cable dressing COMPLETED (Hugh)
• 17:34 Taking Camera to BSC3 crew (Jeff)
• 17:34 Making BRDs for ITMx in Optics Lab (Jeff)
• 17:36 HAM5 Work (Baffle work, Tip Tilt Beam dump, SR3 target removal) [TJ]
• 17:41 IO Work at HAM2 (Cheryl, Ed)
• 18:02 Inspect high voltage cable for Y2-8 ion pump (Fil)
• 18:12 SEI ISI model work (Dave)
• 18:19 Mat (Cintas?) contractor
• 18:48-18:55 LN2 Truck reported stuck (Christina)
• 18:53 DAQ Restart for model change (Dave)
• 20:05-22:25 ITMx work cont (Betsy, Travis)
• 20:10 EY SEI work (Krishna, Jim)
  • 20:24 (At Jim's request) Took ISI CONFIG from SC_OFF_NOBRSXY  -->  LARGE_EQ_NOBRSXY
• 20:45 IO work cont (Cheryl, Ed, Keita)
• 20:48 Pump Cart at EX for Krishna (Kyle, Rakesh)
• 20:51 OFI work cont (Gerardo)
• 21:15 EY Y2-8 Ion Pump work (Fil, Liz)
• 22:12 EY Beam tube work (Arnab, Chandra, Kyle Rakesh)
• 22:23 LVEA Laser SAFE
• 22:58 Un-tripped IM4 & Damped.

This afternoon, Travis and I finished moving the SR2 into it's new position 5mm closer to the BS (+Y).  We had to jockey dog clamps and pushers to do this, attempting to hold the pointing of the suspension as close to it's previous condition as possible.  Of course, we will realign this suspension ~next week when we run the PSL beam through the corner from PR to SR and everything inbetween.  (We need to resuspend the SR2 and check for health via TFs first, as well as fix the SR2 UL M2 AOSEM, and finish HAM3 and elliptical baffle builds.)

While on HAM4, I reseated the 4" HWS mirror/mount that I moved last week, and we removed all tools and misc hardware lingering from the HAM4 work thus far.

Knock on wood that today was our final day of tedious alignment of the ITMX - we managed to get the suspension free of all mechanical interference points, while simultaneously having it point to the center of the OPLEV (with only ~30 and 120 urad of P and Y bias slider help), with all 20 AOSEMs  centered in their range.

We need to rerun the full suite of TFs, but wish us luck!

Betsy, Travis

Re-terminating of the Y2-8 ion pump connector work will continue tomorrow. Had issues with connecting one of the safety interlock connections.

Hugh, Jim, Krishna

This is regarding the idea of placing a seismometer on the BRS-Y platform in order to improve coherence and hence tilt-subtraction. The brief summary is that we found excess low-frequency noise in the seismometer when it was placed on the table on BRS-Y. Hugh had attempted to reduce the noise by adding thermal insulation to the table and the instrument. The last alog on this is 35426.

In the recent data I looked at, this excess noise looks non stationary - it seems to get worse with elevated wind. This suggests it is likely not thermal. The seismometer data shows that the table has much higher motion in the 10-100 Hz as compared to the ground. Since the seismometer isn't held securely on the table, it is possible this excess high-frequency motion is causing it to move ever so slightly, which could look like excess low-frequency noise (step changes). We are attempting to mount the seismometer securely to the table using M10X1.0mm threaded rods and holes to be machined into the table. Results and plots will be posted in a few days.

J. Kissel

Taking the data from this morning's aLOG as my target frequencies, I've tuned BRD S/Ns 015 and 016 to match the highest vertical (a.k.a bounce) and roll mode frequencies of the newly suspended H1 SUS ITMX. Results are attached and tabulated below:

    'Target [Hz]'    'BRD S/N'    'Mean Fit Freq. [Hz]'    '% Diff [%]'
    '9.806'          '015'        '9.853'                  '0.49'      
    ''               '016'        '9.812'                  '0.066'     
    ''               ''           ''                       ''          
    '13.927'         '015'        '14.033'                 '0.76'      
    ''               '016'        '13.926'                 '0.009'

Setup for measurement is as described in the HAM ISI TMDs (see 38741) using corroborating evidence from both the laser vibrometer and a primitive shadow sensor setup. To calculate the above "Mean Fit Frequency," I used a least square's minimization with a Lorentzian seed function,
    fit(f) = (1/Q)^2 ./((f - f0).^2 + (1/Q)^2) + C 
to fit both sensors' data to obtain the measured frequency with the noise, and then took the mean of the two sensors' results.
    
Betsy and Travis are installing these BRDs as I type.

Krishna, Jim, Hugh,

Today, we began the task of replacing the gravitational actuator/damper with capacitive actuators for the BRS-X. This will make it nearly identical to BRS-Y in control and behaviour‌ and eliminate the few incidences of damper problems we have had with BRS-X.

We opened up the vacuum can and machined a hole in the aluminum thermal shield for the capacitor plate wire. The capacitor plate was then glued to the thermal shield using TorrSeal epoxy, which takes a day to set fully. Tomorrow we will complete the wiring. We will also attempt to reduce the offset between the center of mass and the pivot axis to make it less sensitive to horizontal acceleration.

Sometime over the last few days, we lost functionality of the F1 (Face 1) BOSEM on the main chain of ITMX, causing a bit of hunting and measuring.  The chain would not damp and although there were peaks in proper places on all TFs, the noise floor for the PITCH measurement was well below where it should be.  This pointed to F1 as having issues and hence the swap.

S/N 091 came out, 049 went in.

Note, we are seeing that many OSEM OLVs have been decaying over time.  So, while we aren't surprised that 091 was much lower than it should be, likely we need to take a closer look at all BOSEM trends.

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
 

It appears that some process variables are taking on values with characters that do not conform to JSON:

Oct 18 11:10:12 conlog-master conlogd[7334]: terminate called after throwing an instance of 'sql::SQLException'
Oct 18 11:10:12 conlog-master conlogd[7334]: what():  Invalid JSON text: "Invalid escape character in string." at position 44 in value for column 'events.data'.
Oct 18 11:41:52 conlog-master conlogd: Server started. prefix: 'H1:CDS-CONLOG_' database: 'conlog' max inserts: 500 max time: 30 keep alive period: 30 time source: 0 create_messages: 1
Oct 18 11:59:32 conlog-master conlogd[8524]: terminate called after throwing an instance of 'sql::SQLException'
Oct 18 11:59:32 conlog-master conlogd[8524]: what():  Invalid JSON text: "Invalid escape character in string." at position 44 in value for column 'events.data'.
Oct 18 12:19:34 conlog-master conlogd: Server started. prefix: 'H1:CDS-CONLOG_' database: 'conlog' max inserts: 500 max time: 30 keep alive period: 30 time source: 0 create_messages: 1
Oct 18 12:34:12 conlog-master conlogd[9092]: terminate called after throwing an instance of 'sql::SQLException'
Oct 18 12:34:12 conlog-master conlogd[9092]: what():  Invalid JSON text: "Invalid escape character in string." at position 44 in value for column 'events.data'.

The same error repeats at each loading of the channel list.

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.