patrick.thomas@LIGO.ORG - posted 17:26, Friday 10 December 2010 - last comment - 14:38, Wednesday 15 December 2010(408)
Ops Day Summary
10:10 Recycling pickup 1:15 south door of HAM 12 cloth removed, north door cover removed shortly after ~4:55 both doors of HAM 12 cloth covered Scrubbing HAM 12 from 3:56 - 4:13, attached is trend of dust levels in the LVEA during this time Location 1: Inside ISCT4 Location 2: Outside South West corner of clean room Location 3: Inside North East corner of clean room Location 4: Inside South East corner of clean room Location 5: Inside "beer garden" Location 7: Between HAM7 and HAM8 Location 8: Between HAM1 and HAM2 Location 10: Inside H1 PSL
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Synopsis of Chamber Cleaning Test at HAM 12 (Complete report may be accessed at T1000732) Participants: Rodney and Zack Haux, Eric James, Mike Zucker, Jodi Fauver with Patrick Thomas on dust monitors, Dani Atkinson on DCC look-ups, and Chris Soble, Joe Valdez and John Worden on tool mods/repairs Upon our initial entrance into the clean room, Mike discovered that one HEPA fan on the top of the cleanroom was found turned "off". Recommending INS crew locally check all fan units on each clean room with both a particle counter and an anemometer each time the cleanroom is rigged. The adjustable-speed knob on these fan units, which cannot be seen from floor level, is not a good feature. Initial assessment inside the chamber showed there was significant particulate matter. Oxidized surfaces yielded the brown-yellow stain on a wipe as seen in other chambers. Inside the support tube nozzles (non-oxidized) there was a "dry riverbed" of sparkly particles which appeared metallic or perhaps glassy. They were collected on a wipe from one of the nozzles for further examination. Running a finger down the center of the nozzle left a visible clean streak. Several rinsate samples were conducted as a part of the initial assessment. The rotary brushing tool was tested on the same area where the rinsate sample was taken. We tested the Festool power brush tool and vacuum shroud developed for oxide removal. There are substantial mechanical revisions needed to the shroud assembly and brush arbor which we need another meeting to work out so I won't get into specifics. Nevertheless, after much "field improvisation" we were able to get the tool working and ran a successful test. Videos of the brushing test are found at G1001144-v1. We used a "surplus" 60" nozzle dam, whose provenance we could not immediately reconstruct, to block the MC tube aperture The HEPA vacuum, hose and C-3 hose sleeve worked fine. Suction at the tool face was good; with the brush running at speed (high range) but vacuum off, tens of thousands (22,099 counts) of pppcf registered an inch from the brush. This dropped to zero counts (resolution 20 ppcf) with the attached HEPA vac running. The final set of tests was to make sure that we did not introduce HC's. An FTIR sample was taken per standard procedure from the scrubbed and wiped zone, as well as an undisturbed control zone and a liquid control.