[Kimura and Yasui]
On the afternoon of March 11, the vacuum evacuation pumps for MCE, #7 (between IXA and IXC), and #8 (between IYA and IYC) were switched to Ion pumps, and TMP and Dry were stopped.
This may cause a change in temperature within the central mirror room.
Tomorrow, we plan to switch the vacuum exhaust pumps on the 1F of the X-end and Y-end from TMP to Ion pumps.
[Kimura and Yasui]
On March 12, we switched the vacuum pumps in the central mirror chamber to ion pumps.
The TMP and dry pumps currently in operation are pumps #40 and #41 directly below the arm-side GV.
All other TMP and dry pumps in the central mirror room, including those on the 2nd floor, have been stopped.
The vacuum pumps at X-end 1F have also been switched to ion pumps.
Locations where the switch to ion pumps is not yet complete are the EXVs at X-end 2F and the EXVs at Y-end 1F and 2F.
The switch is scheduled for early next week.
