On May 5th the T2-MK2 target was moved to the hot cell for the purpose of checking the beam spot on the Position 2 beryllium target to confirm the results of the T2 area realignment detailed in E-logs #218 and #220.  In preparation beam was put on this target overnight for approximately 1.5hrs at 10uA and 4 hours at 50uA (previously had not seen beam).  Also, there had been issues with the T2 profile monitor over the last couple days, so inspection and repeat of electrical check in the hot cell was planned.  The field in the T2 monolith work area was up to 1.3mSv/hr, and a maximum field of 230mSv/hr was measured 0.5m from the target during removal.

Unfortunately no beam spot was visible on either the entrance or exit windows at Position 2  (a longer exposure will be required next time a beam spot is to be inspected).  Detailed photos were taken, one of each side attached.  It was noticed that the T2 profile monitor cassette had become dislodged within its housing (it was sitting approximately 1" from the fully installed position - photo attached).  It is suspected that this happened when the target assembly was in the beamline - the first time the profile monitor was exercised back in April it moved quite quickly which may have caused the cassette to come loose (it is only held in with friction of the 9-pin connectors and the fit of the cassette body in the housing).  It was re-inserted in the hot cell and an electrical check was performed by Shengli: all good.  After the target was returned to the beam line the electrical check was repeated while the monitor was actuated in and out: once again all good, and the movement of the monitor was slow and smooth (video taken)

Prior to this job new cameras were installed in the hot cell opening aimed at the support ring hole (one aimed north, the other east).  This proved to be a very useful upgrade and made the installation process significantly easier and smoother.  Two cameras were also used during target installation at the monolith (only 1 was used in the past).  Having a second camera at a different angle made alignment easier (reducing time and dose), and should be adopted for future target moves.

Vacuum pumpdown was normal, the cooling system was restarted without change to the vacuum, and operators were able to use the T2 profile monitor during beam ramp-up overnight.

Dose for this job:  Isaac 0.17mSv, Keith 0.06, Ron 0.06