While the T2 monolith was uncovered for T2 Protect repair (see previous e-log), it was decided that the T2 target should be moved to the hot cell to address issues discovered last week with target ladder movement (see e-log #175)

Oct 7:

- T2-MK2 target was moved from the beamline to the hot cell after the T2 protect was reinstalled (the target measured 896mSv/hr at 0.5m)

- The target was inspected in the hot cell: profile monitor looked normal, two beam spots (one higher, one lower) were observed on the entrance window (see photos), the spot on the exit window was low but not quite touching the weld

- T2 profile monitor was checked by probes group at the hot cell --> ok

- Ladder movement was checked by cycling through all target positions twice using the portable control box.  This revealed that the drive motor is actually functioning properly and the fault lies elsewhere

- Tested T2 motor drive cable from 1A racks to beamline with Dave Cameron.  Found Pin B has 190kOhm short to building ground.  Attempts to fix the cable at both ends were unsuccessful and spare wires in the bundle could not be used because there is a break in the cable at an unknown location and use of wire colours in both sections is inconsistent

- Checked entrance side elevation: 1839.0mm with potentiometer at 16.19kOhms.  This is consistent with previous measurement of 1838.7mm.  This confirms that pot, motor, and drivetrain for ladder movement are all ok.

Oct 8:

- Decided to run new cable for target motor drive  (already had on hand for T1/T2 controls upgrade in 2016 shutdown).  The cable is labeled T2TGTMTR-DRV.  It was first tested at the hot cell and then installed by Doug and Ron

- The T2-MK2 target was returned to the beamline.  A camera and monitor setup was used to watch the target entering the hole remotely which greatly reduced dose  (inserting the target requires multiple iterations to get alignment correct, so dose is typically higher than when removing devices from the monolith)

- T2 profile and protect monitors checked by Probes Group from the mezannine --> both ok

- Pumping on T2 volume began late morning, leak was found at T2 protect flange (see previous e-log), after correcting this the vacuum pumped down normally.  A helium leak check was performed on all flanges on the T2 monolith --> no leaks found

Oct 9:

- All services attached to target

- T2-MK2 target moved to position 0 using the new cable and the portable control box

- T2 cooling package started (no change to vacuum)

- T2 cooling package expansion tank level checked - the tank was only ~1/3 full, suspected leak through disconnected female hansen connection.  Tank was refilled to normal level using ISIS water

- Plant Group began replacement of blocks over T2 late morning