This is the source configuration of the MBE. The port numbers here correspond to the
values in the shutter status data (e.g. GMx_Shutter_Control.Value.txt). Each shutter
port has a binary value that is added up to give the logged data value. Port 1 
corresponds to a value of 1, port 2 => 2, port 3 => 4, port 4 => 16 etc.

O3_Nozzle_IonGauge on port 10
O3_Nozzle_Baratron on port 10
O3_Nozzle_RGA on port 10
O3_Nozzle_Direct on port 10
Side_Inlet_IonGauge on port 10
Side_Inlet_Baratron on port 10
Side_Inlet_RGA on port 10
Side_Inlet_Direct on port 10
Sr_tip on port 8
Sr_base on port 8
GM1_TELEMARK_EBEAM_base on port 11
EIES_Channel1_Rate on port 11
K_tip on port 4
Ti_ball_current on port 7
Ti_ball_voltage on port 7
SnO2_tip on port 2
SnO2_base on port 2
Ba2_base on port 3
Ba2_tip on port 3
SiO_tip on port 5
SiO_base on port 5
