putting in thick C12

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User name R. Michaels

Log entry time 00:10:26 on April24,2010

Entry number 319076

keyword=putting in thick C12

23:45 .... Putting in thick C12 target.
Will run like this until about afternoon sometime.

Plan is to take two slugs tonight at 50 uA, then
try to increase the current during the day.

Watch the temperatures ! If they go too high, reduce the
beam current.

The HV's listed in the opmanual HV for C12 which were
lower than for Pb208. This is wrong. We will adjust
HV to put the detectors at ~0.65 of the max ADC.

23:51 .... Ask for 17x7 raster (we were running with bigger
raster since about 7 pm).

Bumping up HV

The mapping of "upper Quartz" (name) to HV channel is from the
opmanual. The mapping of the HV channel to "det1" (name) is
from observational reality as we change them.

Right HRS

upper Quartz .... chan 4 ... is det2 .... increase from 810 to 950V
get 150K

lower Quartz .... chan 6 .... is det1 .... 880 -> 1000. get 150K

------------------------
Left HRS

lower Quartz .... chan 2 .... is det4 .... 750 -> 865. get 158K

upper Quartz .... chan 4 .... is det3 .... 850 -> 975. get 146K

Run 3084 was the run taken while we adjusted HV. Call it junk.

Run 3085 is the first production run with thick C12.