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 1
O3_Nozzle_Baratron on port 1
O3_Nozzle_RGA on port 1
O3_Nozzle_Direct on port 1
Side_Inlet_IonGauge on port 1
Side_Inlet_RGA on port 1
Side_Inlet_Direct on port 1
Ni_tip on port 2
Ni_base on port 2
Sr2_tip on port 3
Sr2_base on port 3
Ti_voltage on port 4
Ti_current on port 4
Pr_base on port 5
Dy_Base on port 6
Ba_tip on port 7
Ba_base on port 7
Nd_base on port 8
SrC_tip on port 9
SrC_base on port 9
GM1_TELEMARK_EBEAM_base on port 11
EIES_Channel1_Rate on port 11
