Measurements and calculations of isotopic exchange between deuterium and tritium and their implications to neutral beam injection

The hydrogen isotope exchange in some beamline components of a tritium injector is analysed using the local mixing model. Various implantation and cleanup scenarios using tritium, deuterium and hydrogen beams are discussed. The model is also used to interpret D(t,n)/spl alpha/. Neutron measurements during the cleanup of beamline elements after the First Tritium Experiment at JET.