Main INDEX,
Monthly INDEX,
PREV,
NEXT
Make New Entry,
Make Followup Entry
User name beck/liu
Log entry time 23:55:15 on July 19, 2006
Entry number 118392
keyword=Beam: some halo values
While waiting for the optics tuning, Doug made some studies with halo
rates. With 7 uA of CW beam, without any target, halo 3 and 4 are 200 Hz,
and Herbert's paddle is 0.2% of the beam current.
Both G0 and G0B (x,y) readings are close to (0,0)
They then put the 11 mm hole in (-39.70 mm). With the same current, halos
and herberts paddle reading increase by a factor of 2.5. They tried to
steer the beam, and could not get the rate down.
Lastly, Brian moved our hole target in. The herbert's paddle
readings stayed more-or-less same as the 11 mm hole.