Chopper vacuum spike correlations to xB current terminated on MS
I've noticed that all instances of the IN02B11 rack mismatches are associated with the vacuum spikes in the chopper region. These spikes have happened with no beam, and without magnet mismatches, but seem more frequent when there is beam. Therefore solving the vacuum problem would probably solve the rack problem.
In addition, the vacuum's background rates in the chopper region are corresponded exactly to hall B's current (see figure 3). The spikes also happen less when hall B isn't on, which could mean that the terminated current on the master slit is poorly affecting vacuum.