Fil, Rahul

Out of chamber investigation

This morning Fil and I unplugged Tip Tilt PM1 cable going to its Satamp and connected it to Tip Tilt JM3 and found no change in its Bosem counts (was still low for UL and UR, like before). We connected JM3 to PM1's electronics chain and it was looking good. We also checked the long grey cable and found it to be healthy. Thus we came to this conclusion that in-air electronics chain is healthy for PM1.

In-chamber investigation

During lunch time when the chamber was empty, I took the OLC of all four BOSEMs for PM1 and found their values to be lower by 20% (last taken in April 2025).

This tells me that either the in-vacuum cable is not working properly or all four Bosems are malfunctioning. I need more in-chamber time to further investigate this issue.