The G4AF: Varian True Beam geometry definition

Initial Head mockup elements to work with externally produced phase-space being saved after the first collimator

• secondaryCollimator (in the Vacuum)
• BeWindow (The Vacuum and the Air boarder) ?
• flatteningFilter (in the Air) ?
• ionizationChamber (in the Air) ?
• mirror (in the Air) ?
• Jaws (in the Air)
• MLC (in the Air)