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
Al_base on port 7
EBeam_zone on port 11
Newzone on port 11
Bi_base on port 6
Bi_tip on port 6
Sr_base on port 8
Fe_Base on port 4
Ba_base on port 9
Nb2O5_base on port 3
La_base on port 5
Ti_Ball_Current on port 1
Ti_Ball_Voltage on port 1
