{Kyle, Tyler, Chandra}

In an attempt to find air leak at EX and based on some aLOGs from summer 2018 (43165 & 43184), we had reason to believe that IP12 may be leaking and so today we isolated IP12 + chevron baffle from main volume and leak checked with a background of 1.5e-9 Torr-L/s of He. We sprayed ample amounts of He and saw no rise in signal.

We also sprayed the beamtube side flange of isolation GV while Jeff Jones remotely watched the RGA screen in control room, running in MID mode with new Labview based software with no change in AMU 4. This test is inconclusive, however, because we were opened to BT.

We suspect the leak is in the e-7 Torr-L/s range.

Next opportunity to leak check with BT GV closed is March 3 when we replace the maglev turbo.