Reports until 11:17, Tuesday 25 February 2020
H1 TCS
camilla.compton@LIGO.ORG - posted 11:17, Tuesday 25 February 2020 - last comment - 13:57, Wednesday 26 February 2020(55288)
TCS X Chiller filter changed
WP 8545 TJ, Camilla.
The TCS X chiller filter which has been looking green was changed to a new one (photo) and the area wiped out/ metal wire plug rinsed. This involved turning the CO2 X laser and TCS X chiller off around 16:45 UTC to 17:15 (chiller), 18:15 (laser).
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Comments related to this report
stephen.appert@LIGO.ORG - 11:26, Wednesday 26 February 2020 (55315)TCS
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Does this green filter look more green than usual, given service life? Are there any substantial particles within the mesh? Wondering how those on site are reacting to the findings of this log.

It seems that there is no apparent large particulate, which may have been precursors to the LLO TCS CO2 laser chiller filter issues (ref. LLO aLOG 25658, LLO aLOG 22766, E1600282). However, thought I'd check to confirm that this is the case.

thomas.shaffer@LIGO.ORG - 13:57, Wednesday 26 February 2020 (55317)
Link

There isn't any particulate like in the LLO2276, just the usual greenish-grey coloring and sludge of the same color in the wire mesh filter. I don't think that the this greening has been getting worse, but I could anecdotally say that I find the TCSX filter needing to be swapped more frequently (need to check logs at the chiller to verify).