gerardo.moreno@LIGO.ORG - posted 17:15, Thursday 10 May 2018 - last comment - 09:21, Friday 11 May 2018(41943)
Leak Test of IP gate valves, HAM2, HAM5 and BSC2 Viewports/blanks
(Kyle R, Gerardo M)
Today after lunch we removed all aux cart equipment used to pump down BSC1 and BSC3 annulus systems, then we moved to do a gross leak check of disturbed joint conflats, background for the entire procedure remained under 10-09 torr*L/sec.
Helium leak tested the viewports/blanks installed on HAM2 and HAM5, and the new installed ion pump gate valves (IP1 and IP2). Kyle noted a couple of viewports that had tape indicating that needed testing on BSC2, leak checked those as well, and removed the tape. No gross leaks found.
Note that we had valved-out the YBM MTP so that all of the helium signal would be routed through the Vertex MTP which was backed by the leak detector. Each joint got a minimum of 120 seconds of audible helium flow, 60 seconds at each 180 degree-separated test slot. Also, following this exercise, we re-exposed the YBM MTP and added the XBM MTP. Thus, the combined volumes of the Vertex+YBM+XBM are now pumped by the (3) MTPs.