Jamie, Alexa, Kiwamu

We went in to HAM1 this morning to deal with two tasks:

RM TT eddy current damper adjusted

We wanted to make sure the eddy current dampers (ECD) on the tip-tilts (TT) in the REFL paths (RM1 and RM2) were set correctly after we touched them in the previous incursion.  Bram sent us a procedure for setting the spacing, which we followed.  There are four ECDs, two front and two back, on the left and right side of the mirror mount (all in the same horizontal plane):

• check mirror hanging freely (undamped)
• Undo ECD screw locks (lock nut on front ECD and set screw on back), and back out ECD screws
• turn 8-32 ECD screws in until it just touched the coper nub
• back out ECD screw between one (1) and 1.25 turns

The procedure went smoothly, and the TT seem to behave fine after, although we have no rechecked the YAW transfer function.

I'll try to find a DCC for the ECD setting procedure.

POP search

Kiwamu climbed under HAM1 to wriggle over to the north side of the table to try to find the POP beam coming out to the POP periscope.  Unfortunately he wasn't able to find anything, using both an IR card, a viewer, and I clean wipe.  We suspect the beam is either not coming through the swiss cheese baffle, or is being lost in HAM3