There was an automated call to the Control Room today just before 1PM (PST) from Hanford informing us of siren/alarm testing ongoing this afternoon. The testing will continue intermittently until about 4PM today.
The attached are M0/R0 transfer function measurements on H2 SUS ETMY M0/R0 with the damping loops closed. Drive parameters were identical to the undamped measurements.
A late alog to cover the testing performed at LHO last week on the CDS software OSEM watchdog system, released as RTS version 2.5.
D.Barker, R. McCarthy, J. Batch
R.Bork, A. Ivanov
Further to my last ALOG, we performed more testing in the LVEA on ITMY and FMY (which WD Disables SEI BSC8 via Dolphin IPC). We then extended the tests to the EY end station, in which ETMY was tested (which WD disables SEI BSC6 via RFM IPC). We are in the process of formally writing up the test specs and the test results, but we can announce here that all tests passed with only one minor software change needed.
On Friday Jim and I returned all systems back to their nominal state, with the software watchdogs (which run on the front end IOP processes) running along-side the user SUS and SEI models. Jeff performed ETMY commissioning Thur and Friday and we can report that the new watchdogs do not trigger during nominal operation of the systems.
The new IOP OSEM watchdogs are monitoring the six M0 OSEMS on ITMY and ETMY, and the six M1 OSEMS of FMY, using the nominal trip filters and levels. Note that the TMSY OSEMS are not being monitored at this time because they are not in operational range and would trip the h2iopsusb6 watchdogs if attached.
I'll alog links to the relevant DCC documents covering this work when they are released.
The crew got through wipe-down on Friday so they will start this morning with the second vacuum followed by FTIR samples and final inspection. Feedthroughs are inspected and ready for installation ASAP. I would prefer to get that done before we move the cleanroom.
Thomas and I cleaned the BSC8 RH. It did have some large fiber debris under the NiCr wrapped glass form, sitting in the shield. This came out easily once we removed the RH from the quad structure. Smaller glass particulate was cleaned with swabs wetted with IPA, and an IPA flush around the macor parts. Full set of pictures: https://ligoimages.mit.edu/?c=1031 RH is reinstalled and ready to go.
Attached are plots of dust counts > .5 microns. I have also included a plot of H0:PEM-LVEA_DST15_MODE to show when the dust monitor located under the clean room over BSC8 (H0:PEM-LVEA_DST15_5) was not being recorded.
Apollo has been working on removing unnecessary items from the VEA at Y-end. I went out and checked yesterday morning and things looked good. Since the VEA was not in laser hazard this morning,Terry S. and I took the opportunity to walk-down the VEA to establish as time-line for the required cleaning. Terry and the crew are doing a deep clean today. As soon as SEI and SUS testing are complete, the testing cables can be removed from the lay-down space on the E-module and the precision cleaning can begin (~Monday,26 March). We'll try for second cleaning ~Tuesday, 27 March. Many items have been staged for the install including both soft roofs, all door and dome covers, and pallets for doors and dome. I'm attaching a drawing of the floor lay-out for BSC6 cartridge install so that everyone is aware the space restrictions we're dealing with.
Brushing is complete: a total of five drills were used in this chamber. First vacuum has started. Hugh brought the HAM spacer to the crew for fit check and mark up as soon as first vacuum is completed. Once that is done, we'll proceed with wipe down, second vacuum and close-out. I anticipate we will be finished with cleaning by COB today and installation of feedthroughs can start on Monday.
Yesterday I found the diode room AC unit without power, and according to trends it had been down since 3/5. The electrical box outside the LVEA, near the outdoor units, was off and the pull tab (gives units power) was found ~10 feet away. This occured during a high wind storm, so it's possible a strong gust of wind threw something at the box. With everything back in place, the room cooled down from 86F to 70F in about an hour. The diodes do not seem to have been affected by this.
The environmental monitoring system is currently down, which is why the diode room temperature has dropped to zero.
Water pipe is being laid out for the chiller lines. Work will be ongoing through this week and next week.
JimW GregG EricA MitchellR HugoP Unit in the storage container has light chamber payload (HAM3) arrangement, no L4Cs although we could add the brackets. It has 3 vertical GS-13s but no horizontals. Ready for chamber side testing once GS-13s are available.
- HAM3 ICC continues. - Alarms from DAQ reboots, Dave called the CR and notified. - Doug Cook, Y-End work, per work permit 3111. - Kyle Ryan, Vacuum work rearrangement, purge air and Turbo headers in CS, per work permit 3112. Received some dust monitor alarms, dust monitor 15 complained of invalid alarm, investigated, monitor is flashing "low battery", left as is, the particle counter is inside the cleanroom over WBSC08.
Support tubes were picked clean of fibers and bellows were vacuumed. Dust barriers were installed and then support tube protection was installed. Brushing began and all but three sections of the floor were completed. Four drills were used.
Here are some ResourceSpace photos of yesterday's placement of one of the H1 output tube sections.
Mark L. Chris, and Mick worked at HAM3 all day. Checklist was updated and reviewed with crew. Viton strips were attached to dust barriers so that the barriers were ready for install. Feedthroughs and viewport were removed from the chamber and preserved clean. Initial inspection was completed and documentation photos taken. The support tubes had so many fibers on them that the fibers must be "picked" prior to bellows protection being installed so no "brushing" went on today.
Alex, Dave, Richard, Jim, Vern, Rolf, Joe
We had a successful day testing the new SUS OSEM software watchdogs on the BSC8 systems. Rolf released advLigoRTS/branch-2.5 which we installed on H2. We built test models for h2tcsl0 (to generate the OSEM signals) h2susb478, h2susb78 and h2seib8 (to drive local DAC channels and verify the watchdog kills the DAC outputs). We modified the IOP models on h2susb478 (ITMY) h2susb78 (FMY) and h2seib8 (BSC8 ISI and HEPI). Representative channels for DACs which are under test were routed back to the ITMY ADC card, such that we could verify the analog voltages coming out of the AI chassis were being zeroed by the watchdogs.
Alex installed the Dolphin system such that h2susb478, h2susb78 and h2seib8 could communicate using PCIe IPC.
By driving the ITMY OSEM signals with the TCS DAC, we were able to test that the h2susb478 IOP zeroed its DAC (DAC0 was tested) and disabled the DAC's anti-imaging chassis (DAC1 was tested. Richard injected a function generated electronic signal into the AI in parallel with the binary control signals to perform this last test.
We tested that both ITMY and FMY can independently kill the DAC channels on the SEI frontend (as well as killing their local DAC channels). We constructed MEDM screens to conduct these tests.
We also tested:
All systems passed their tests. Tomorrow we will test the EY BSC6 systems.
Transfer function measurements are running tonight on H2 SUS ETMY. The estimated completion time is ~4:00AM PST.
Jim, Eric, Corey, Hugo
We recently received 5 production-GS13s from LLO: 3 verticals (Pods #: 30, 14, 88) and 2 Horizontals (Pods #: 93, 24). They are intended for HAM-ISI Unit #4.
We huddl-tested them before installation. One of them (Horizontal, pod #24) features the behaviour we have observed on GS13s with whether a broken flexure or a stuck mass. We tried tilting the instrument back and forth to unlock the mass. We could feel the mass moving. The ASD measured after tilting the instrument is the same as before.
Greg, Hugo,
Pod #24 was opened. The flexures were checked. Nothing abnormal was noticed. The instrument's leveling was quickly perfected and the pod was closed.
Attached power spectra shows that the instrument is still not working. It also shows that the rough leveling of the test bench is not the cause of this malfuctionning.
