User name Reitz
Log entry time 22:59:55 on December23,2003
Entry number 115111
keyword=RICH trips vs momentum settingthis is a more efficient way to find the weak spot in the RICH:
quads were set to 2.06GeV/c, and we only changed the dipole by hand
(red curve is D1 momentum from 1.95 to 2.1, the elastic
peak would be centered at a setting 2.025GeV/c)
the green curve is the HV of the RICH, the orange curve is the
beam current.
As long as the momentum is above ~2.005GeV the RICH never trips.
Operating the RICH at 2120 Volts, it will always trip, once
the momentum is below that value. In the latter case, with 15uA
on the thick carbon target, trip level is between 1950 and 2000Volts.
FIGURE 1
