Source mover tests: We have seen that the coil resistance doesn't increase like it used to, with as many as 256 consecutive steps (the most we could do reliable in Run71 was 4).

Tried to move it till it hit an endstop - but we never saw the endstop-to-chassis connection. But I think that's a wiring problem - I confirmed that we were hitting the endstop by doing move sequences and watching the temperature. The temperature spikes decrease in amplitude when the source carriage is stopped by the endstop.

In Run71 we could only move 1 mm/hour. In this run I've moved it as fast as 12.6 mm/hour for as far as 18 mm. But at that rate the fridge doesn't seem to be able to keep up - it gets warmer with every step, and the circulation pressure keeps increasing. Same at 9.5 mm/hour. We can move it at 5.3 mm/hour and maintain fridge stability.

Other news: the replacement Si HV detector has arrived