michael.rodruck@LIGO.ORG - posted 16:00, Wednesday 27 July 2011 (1108)
Ops Day Summary
- Shims added under masses on BSC ISI
- Ski to outbuildings checking water levels in tanks
- Chamber cleaning at BSC7
A new version of the "prepare quad" script is uploaded to the SVN: /ligo/svncommon/SusSVN/sus/trunk/QUAD/H2/ITMY/Common/MatlabTools/Prepare_ITMY_20110727.m The script uses caput to change the state of the switches to our "Known Good Starting State" conditions. The only hard-coded part is on Line 22: optic = 'ITMY'; Please change to whichever "optic" (i.e. ETMY, ITMY, ETMX,ITMX) you are using it for and update any vales as necessary. Then save in whichever directory is appropriate for the optic you are working on.
0817 - Praxair arrives 0845 - H2-PSL work on Diode Room enclosure begins 0900 - RichardM at EX testing dust monitors, affecting weather stations and systems there 0930 - Paradise Water arrives 0945 - GregorioT at MY 1110 - Nor-Cal visits Hugh 1125 - MichaelR in Diode Room 1251 - Betsy and Richard out to SUS stand in LVEA 1300 - Rai Weiss lecture: "Introduction to LIGO" 1500 - EY, LSB Fiber Lab, LVEA entrance alarming erratically 1600 - Keita begins transition to Laser Hazard 1615 - JonathanB to EY to check Pcal stand 1645 - LVEA in laser hazard (PSL contractors are done)
All the H2 front end and DAQ software are recompiled using the latest tag-2.3 version of the Realtime Code Gen system.
All IOP and user models were recompiled.
All frontends and DAQ computers were rebooted to install the new software.
The H2 DAQ framewriters were modifed to write frames following the aligo naming standard
H-H2-[R,T,M]-{GPS}-{SIZE}.gwf for RAW, SECOND-TREND and MINUTE-TREND respectively.
So for example the file H-R-994483200-32.gwf becomes H-H2-R-994483200-32.gwf
All existing frame files were renamed on both fw0 and fw1 systems.
Spool connecting BSC5 to GV15 will be removed soon. Need to decouple annulus plumbing from spool-to-GV15 flange, requires venting GV15's annulus volume, this volume has never been vented, don't know if inner O-ring(s) will leak into CP6/X2 module -> First I isolated the ion pump body from the rest of the annulus piping, then I shut down the aux. pump cart connected to but isolated from GV15 and changed the setpoint at which the turbo starts to a value below what the diaphram backing pump could achieve. Next I started the pump cart and let the pressure come down to the ultimate pressure of the diaphram pump (~1.5 torr). Next, with Gerardo monitoring the pressure in CP6/X2 module, I valved-in the pump cart into GV15's annulus and Gerardo confirmed that CP6 pressure was unaffected. Now I opened the orifice (vent port) and the hanging turbo which resulted in the annulus volume settling in to around ~200 torr. Still no change in adjacent volume pressure. Finally I shut down the aux. cart and let the annulus volume fully vent -> No leak. Decoupled piping from spool flange and blanked-off both (decoupled) flanges -> Pumped GV15 annulus volume with pump cart, opened pump body to rest of piping and restarted ion pump. Isolated pump cart from annulus. Removed RGA from BSC5. Now Apollo can remove spool from between BSC5 and GV15
More framing work for the diode and chiller rooms. The ceiling joists have been added. No construction work tomorrow, but on Thursday they will start cutting into the LVEA drywall. The North crane is still tied up.
Dust counts are again low. A trend of the last 10 hours is included.
We continued inspection and wipe down in BSC-7. Three additional instances of the mystery substance were found and removed: these areas were also FTIR sampled. The flooring was removed and covered (just in case we need it for something after re-installing the dome) with C-3 and placed in a cleanroom. With the floor removed, we were able to get half of the chamber bottom wiped down and FTIR samples taken. The C-3 cover on the dome was removed in preparation for work tomorrow. Carolyn worked on paperwork for the FTIR samples and on modifying the spreadsheets for record-keeping in prep for BSC-8.
Changed prefilters for AHU1 and 2
(Corey, Hugh, Vincent)
Checked Level of the Optics Table and also took shots of the top of Stage0 (where the Alignment Pin cut-outs are). Optical Level was used for level-checking.
While working around the table, removed the Alignment Pin Washers for Stages1-2 & Stages0-1 (thought it would be a good idea to not leave these loose items on floated stages). There is a photo (which needs to be rotated clockwise 90deg) of where these washers are located. The Stage1-2 Washer is a little tough to retrieve, but it was pulled out with the use of a small allen wrench.
Took opportunity to pull lots of lingering hardware and tools which were "stored" on Stage0.
Vincent wanted to check the big masses (Leg Elements) on top of the Keel (Stage2) for any possible vibrations. Sure enough, the smaller (~200lb) masses on top of the bigger masses did have some observable gaps underneath them. [tried to snap some camera-phone photos to illustrate this].
The DAQ system for the Oplev Mid-y test has encountered an unexpected shutdown. The DAQ card and electronics have been brought back to the corner station for troubleshooting and will be put back 'online' as soon as possible. Our stand-alone system had been running for almost a week without interruptions. The last successful data log was taken around 16:07:02 (PDT) on 7-25-2011.
We completed the 2nd wipe down of the upper sections of BSC-7. Work was slowed by the discovery of a mystery substance (Jodi calls it goopies, Mike L. calls it snot: see pix below) found during inspection. It required special attention to remove as it was very tightly adhered to the chamber, in some cases appearing to be baked on. It seems likely that this material was left over from iLIGO install. We will continue to investigate. We ended the day by taking eight FTIR samples.
Framework for the chiller and diode rooms is being laid down. The North crane is temporarily tagged out, as it is supporting the make-up air ducting for the acoustic enclosure.
No dusty work, a trend of the last 10 hours is attached.
Today drove all M0 and R0 Top OSEM Basis Channels with a Uniform White Noise TF from 0.1Hz to 50Hz with the De-Whitening Filters disabled, first with Binary I/O LP Disabled and then with the Binary I/O LP Enabled. Then drove each M0 and R0 Top OSEM Basis Channel with a Uniform White Noise TF from 10Hz to 50Hz at twice the amplitude with the De-Whitening Filters Disabled, first with the Binary I/O LP Disabled and then with the Binary I/O LP Enabled. Overlaid the 10Hz to 50Hz data on the plots. Results Below.
The crew re-installed the BSC flooring and worked on the second wipe-down starting from the collar section. Cheryl got TCS fit check taken care of just after lunch and then wipe-down continued. The upper section was completed before end of shift. We also continued to move equipment from BSC-7 to BSC-8 as time permitted.
Summary: With a lowest resonance of 35 Hz, the new pier avoided the 4-pole motor region at 30 Hz. Reducing payload at the top could at most increase the resonance by 10% to 38 Hz. We examined the motion of the new leaning optical lever pylon that is grouted to the floor at MY for testing (see photo). A breadboard and translation stage for the photodiode at the top of the pylon appear larger than necessary, weighing about 15.7 kg, so we investigated the maximum gain possible from using lighter equipment by measuring without this load. We also measured with and without the 15 kg dummy photon calibrator. The figures show accelerometer spectra from near the top of the pylon for the nominal and modified configurations, as well as corresponding spectra for the floor below the pylon. The peak at just below 30 Hz is on the ground and likely produced by a four-pole motor. It is good that the peak for the nominal configuration mostly avoids 30 Hz because such peaks occur at all stations. The transient peak on the ground at 34 Hz is atypical and of unknown source. The lowest resonant frequencies are tabulated below:Equipment on pylon Lowest frequency (Hz) Diode assembly and photon calibrator (nominal).....34.9 Diode assembly only................................................36.4 Photon calibrator only...............................................38.1 Nothing on pylon.......................................................38.1We were a little surprised that the lowest frequencies for the pylon alone and for the pylon with the mock photon calibrator in place were virtually the same. We added various masses at different levels and found that mass at the level just above the photon calibrator (see photo, the mock photon calibrator is at the level where the caution tape attaches) moved the peak at 42 Hz, but had little effect on the lowest peak at 38.1 Hz. On the other hand, moving the same mass to the top of the pylon did move the peak at 38.1 Hz down. Thus, without stiffening the upper stage of the pylon, a lighter diode assembly could, at most, raise the lowest resonance from 34.9 to 38.1, about 10%. Robert Schofield and Gregorio Tellez
- Mid-Columbia Forklift arrives for RodneyH - Lots of kids on site for a tour...Riverton residents join them - Drilling by H2-PSL begins at ~1:20pm - Richard, Keita working on syncing OMC and LSC, AWG reboots involved - Fred leads tour for UW students into LVEA - Laser Hazard at ~4:30pm - ICC by BSC7
Dumped unpumped IP11 volume into Y-end turbo, energized IP11, isolated and shut down MTP and QDP80 Closed X-mid purge air valve
Continuing investigation of the Binary I/O TF when LP Filter is OFF versus ON. I ran a 0.001Hz resolution transfer function in order to get "prettier" plots that would track better to the modeled TF line.(Attachment 1) Also ran a TF with the DeWhitening Filter 'OFF' and stronger drive strength from 10Hz to 50Hz. (Attachment 2)
Anchor points for hanging the H2 PSL chiller in the new chiller room were drilled into the concrete today. No dust spikes were recorded. A trend of the last 10 hours is included.
HAM 7 had the chocks removed by Apollo on Thursday, allowing the support tubes to be adjusted. The crossbeam was slipped in between the two chambers and is now resting on the table secured to the opposite crossbeam. The housings have been moved onto the piers and the adaptor plates and weldments attached and will soon be ready to attach the crossbeams.
I've been running into problems with the bottom clamp where the threaded holes that support the clamp sleeve were not tapped deep enough. I may end up having to remove a lot of heli-coils and re-tapping the holes since other methods (such as attempting to tap the heli-coil) have ended up in many broken taps.
