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User name paschke
Log entry time 07:27:36 on October13,2005
Entry number 156710
keyword=difficult to achieve beam launch angle
Attempting to deliver high current beam into Hall A. Empty Target for recovery
from Hall B setup.
06:30 - Setup for Hall B complete. Ready for CW into Hall A.
Took 5 uA for raster check.
06:45 - raster looks fine. Requested beam positions at BPMA_X =1.6, BPMB_X =
-1.4 Ops found this difficult to get to, and had to start at upstream
correctors. Significant deflection necessary at 1C20.
07:10 - Positions good at target BPMs, but ep Ion Chambers reading 160 Hz at 1
uA, and trip at 6 uA. Ops will continue to refine the beam optics to try to
get these positions on target without excessive rate on ep ion chambers.