Results of 30 second engineering testing of the LBL APIS

Engineering testing for MFTF-B of the LBL Advanced Positive Ion Source (APIS) ha recently been completed on the NBETF test stand. 500 shots of 30 seconds were run at 80 kV, 42A, deuterium. Optimum perveance was 1.85 μpervs, with divergence 0.350 X 0.950. Species was measured with an Optical Multichannel Analyzer (OMA), 87/10/3, full, half and third energy. The water fraction was at the limit of OMA resolution, ≤0.2%. Gas flow was 12 T1/s, which is below equilibrium for the NBETF neutralizer, but correct for the MFTF-B beamline. Beam properties were the same at equilibrium flow, 17 T1/s. Results of these tests indicate that both the plasma source and accelerator are ready for industrialization for MFTF-B. Extrapolated filament life is 3 x 10/sup 3/ full power 30 second shots. Brief testing with hydrogen for GA gave 55A at 80 kV, for 5 seconds, at an optimum perpendicular divergence of 1.10