Three experiments will use the polarized target
setup in Hall C: SANE, Semi-SANE and Compton.


Both SANE and Semi_SANE use the Beta and the
BigCal. The Compton experiment only uses
BigCal and does not use Beta.

Beta consist of a scintillator hodoscope,
gas Cerenkov detector and lucite hodoscope
followed by BigCal. The scint hodoscope
needs  a length of about 3cm. The gas
cerenkov length is 164.3cm. The lucite
needs a length of about 10cm.

Following table has the distance from the
target center for each device for Beta.

Detector       Distance
---------      ----------
Scint hodo     Front 53cm
Gas Cerenkov   Front 60.7cm, Back 225cm
Lucite         Front 230cm, Back 240cm
BigCal glass   Front 325cm

The compton experiment needs
only the BigCal. Next  is a table
of the Beta+BigCal or BigCal
angle needed and BigCal distance
from target center to front face.


Experiment     Angle    Distance
-----------   ------   ---------
SANE            40      325cm
Semi-SANE       30      325cm
Compton         25      700cm
Compton         82      250cm

The range of HMS angles is in
the following table

Experiment    HMS Angles
----------    -----
SANE          13-48
Semi-SANE     11
Compton       12 and 39

The target field for SANE will
be both parallel and perpendicular.
For Semi-SANE the target field
will be parallel. For Compton the
target field will be 5 degrees off
from parallel for the HMS angle = 12
degrees. For Compton with HMS angle
= 39 the target field will be off.

-- 
                Mark Jones
                757-269-7733
                jones@jlab.org