janos.csizmazia@LIGO.ORG - posted 19:36, Friday 02 February 2024 - last comment - 04:33, Saturday 03 February 2024(75717)
2-2 vent vacuum diary
Today's activities: - HAM3 Y+ door was reinstalled. No issues during the process, however, some scratches have been found - see pics. - After the door was reinstalled, the Annulus volume is being pumped - The Gate Valve for the 1000 amu RGA was installed on the Y-mainfold, with an additional angle valve - 2 out of 3 16.5" 3IFO feedthrus were removed from BSC8 - at the north side. A very scratchy conflat was found, see pic. To mitigate the risk, Technetics-Helicoflex-type CF seal repair gaskets will be ordered. At the south-side of the chamber, the unnecessary cable trays were removed, in preparation for the 3rd feedthru removal - EX pumpdown status: it is already at ~2E-7
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(Jordan V., Gerardo M.)
Installed a gate valve at the YBM (Y beam manifold) to be used for the new 1000 amu RGA. A zero length reducer with a metal seal right angle valve were added to facilitate the addition of parts in a near future. No issues were encountered during the installation.
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EX pumpdown curve. The two spikes noted on 2/1/2024 were turbo pump isolation valve cycles, the gate valve was opened and closed to perform leak tests of the conflats/ports disturbed on this vacuum envelope, more on this aLOG.
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