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 2
O3_Nozzle_Baratron on port 2
O3_Nozzle_RGA on port 2
O3_Nozzle_Direct on port 2
SiO2_base on port 7
EBeam_zone on port 11
Newzone on port 11
Mg_tip on port 6
Mg_base on port 6
InOx_tip on port 8
InOx_base on port 8
Fe57_base on port 4
Ba_base on port 9
SnO2_base on port 3
La_base on port 5
Ti_Ball_Current on port 1
Ti_Ball_Voltage on port 1
Fe_base on port 10
