Original Problem:

Leaks on the B and D copper blocks, probably due to corrosion between the blocks and the inserts. Final solution, after many tries, was to make an indium sheet the size of the copper blocks and use that to seal the entire surface.

So far offline tests seem to show these seals working, though long term tests are needed to say for sure.

New Problem:

TM4 was in the conditioning station, running water and under vacuum. 50A on the target and tube heaters from Friday evening to Saturday afternoon.

Sunday morning 9:30am target heating increased to 200A, 100A on the tube heater, ramp finishing around 1:30pm.

At around 3pm, the vacuum stops dropping and begins to climb very slowly, continuing until Monday morning (see first attachment).

Tests on the individual water lines show an immediate vacuum response only to the EE lines, the other lines show no response (note the window line is blanked off since the containment box is not on).

With water in the EE lines, the vacuum sits around 1e-6 near the target.

Testing:

Ramped target to 400A and tube to 200A. Sitting there for several hours shows no change in the vacuum response, though there is a variation that corresponds to the chiller turning on and off (see second attachment).

Ramped target to 450A and tube stayed at 200A. Vacuum staying in the low 10^-6 range, seems to be entirely due to EE leak, other seals are holding well.