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User name Kelly
Log entry time 02:51:40 on June 6,2001
Entry number 62045
keyword=raster and beam position
The last shift could not set raster size to desired 4 mm diameter; the x voltage was saturated. Eventually Doug determined that the Moller quads were off and retained "strange residual fields", but the tune assumed that the Moller quads would remain on. After cycling Moller quads, the 4 mm diameter spot, as seen on OTR, was obtained using 200 mV in x-raster and 500 mV in y-raster. Raster++ (spot) gives 3x4 mm image.
Present BPMB is (-1.96,0.08) and is consistent with spot image. Beam on the BeO appears left of center and a little high, with edges on cross-hair drawn on screen. Some uncertainty remains in the relationship between BeO and reference cell centers.