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User name V. Sulkosky
Log entry time 01:49:16 on June13,2009
Entry number 280920
keyword=Magnet Levels and RecoveryI zoomed in on the magnet levels and flows for the spectrometer
magnets. It looks like right before the magnets went down that the
liquid level for the right dipole (red curve) increased by from 72%
to 82%. Right after this the dipole started ramping down and the
liquid levels dropped suddenly. The right dipole seems to be the
cause of the problem and it took four of the other magnets down with
it. This observation is based on the fact that the first symptom was
that the right dipole current started to ramp down on it's own right
before the liquid levels dropped. Hence I speculate that either the
right dipole tripped off or quenched.
The cyro-on-call called the Counting House and notified the shift
crew that everything appeared to be fine outside of Hall A.
Unfortunately I was did not get to talk to the cyro-on-call myself.
The first figure shows the zoommed in plot of the liquid levels at the
point that they dropped. The second figure shows the entire period
and the recovery of the liquid levels.
FIGURE 1
FIGURE 2
