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User name Jack (Techs)
Log entry time 21:40:57 on September 11, 2009
Entry number 289149
keyword=Right Q2 - latest trip
After Robert adjusted the controls for the cryogenics, we ramped up RQ2
after things seemed rather stable. RQ2 sat at 1400A for a brief bit and
then dumped. All things cryo seemed to be OK. I think the power supply
tripped on its own. This is either a lead voltage fault or a coil voltage
fault. Either is never a good sign. The lead flows look OK. I have never
checked the quench protection circuits on this supply, things may need
some adjustment. Ideally we would like to go into the hall for a number
of hours to verify the magnet and supply are OK, at a time when people
have had enough sleep. It may have been a bit of excessive noise in the
circuit and it will run fine after this. There is no definitive answer
unless a scope is put to the supply. In the interest of getting data, it
may be reasonable to try resetting the supply and taking it to a lower
current. If that is stable, ramp it up in increments to 1400A. But, if it
trips again don't push it.