/sup 3/He high power neutral beams for TEXTOR comparison of 55 KeV particle beam and vacuum system data with /sup 4/He, deuterium and hydrogen

摘要

Neutral particle beams of the /sup 3/He isotope in the megawatt range were successfully produced by the neutral beam injectors of TEXTOR. Measurements of beam and ion source characterizing data, i.e. perveance, divergence, neutralization efficiency, beamline transmission and gas flow rates for 50 kV, 49 A, 2.5 MW, 3 sec /sup 3/He beams are compared with relevant data of hydrogen, deuterium and /sup 4/He. The LHe cryo condensation pumps are capable of pumping the resulting /sup 3/He gas flow rates of 50 mbl/s without technical modification at 4.2 K, if covered prior to each beam pulse by an amount of argon frost with proper ratio of Ar/He. Beamline pressure, reionization losses and preliminary results of /sup 3/He-injection into TEXTOR are given.