Typical values of gsrx(y)_adc are
shown in this
plot. In
DBASE/rss.database set n_sr_adcy_zero =3700 and n_sr_adcx_zero =4100
for all runs. n_sr_slopex(y) and n_sr_offsetx(y) can be
determined for each run by calibrating the slow raster ADC to the SEM
ntbpm . There is a
paw kumac
which does that calibration. The ratio ( n_sr_slope) between the raster
adc and the actual beam position at the SEM is assumed not to change
during the experiment. In DBASE/rss.database set n_sr_slopex = 0.00285
and n_sr_slopey = -0.00285 . The n_sr_offsetx(y) can change during the
experiment and could be determined for each run.
4. A
plot of the EPICS
bpm positions (in mm) shows that the horizontal beam position was
fairly steady with 4 main regions. The vertical beam position was
steady for the perpendicular target running (runs 43231-43611), but for
the parallel running there are distinct periods where the beam was at
-1mm, -0.5mm or 0mm.
Tables of the horizontal and vertical positions:
Run range
|
EPICS X bpm (mm) |
SEM (ntbpmx) (mm) |
43231-43340
|
-1.5
|
-2.3
|
43341-43611
|
-1.2
|
-1.9
|
43702-43805
|
-2.2
|
-3.3
|
43806-99999
|
-1.9
|
-2.7
|
run range
|
EPICS Y bpm (mm)
|
SEM (ntbpmy) (mm)
|
43231-43650
|
0.0
|
-1.25
|
43651-43701
|
na
|
0.0
|
43702-43704
|
-1.0
|
-3.4
|
43705-43709
|
na
|
-3.4
|
43710-43710
|
-0.5
|
-2.3
|
43711-43719
|
0.0
|
-1.1
|
43720-43728
|
-0.5
|
-2.3
|
43729-43738
|
0.0
|
-1.1
|
43739-43741
|
-0.5
|
-2.3
|
43742-43755
|
0.0
|
-1.1
|
43756-43805
|
-1.0
|
-3.4
|
43806-99999
|
0.0
|
-1.1
|
|
|
|
|
|
|