DEVELOPMENT OF A 0.025-A, 12% DF H - SOURCE FOR LANSCE

Present operations at the Los Alamos Neutron Science Center (LANSCE) accelerator use a surface conversion source to provide 80-keV, 16 to 18-mA H beams with typical lab emittance of 7(πcm-mrad). Operational flexibility of the 800-MeV linac, proton storage ring, and other experimental facilities will be increased by a higher current H - source. The present goal is to achieve a 25 mA H surface converter source with modest (20%) emittance increase without sacrificing the present LANSCE production source 12% duty factor (df) and 28-day lifetime. The LANSCE 80-kV ion source test stand (ISTS) has been brought into reliable 24-hour per day operation with computer control and modern electronics. A fourth production source has been fabricated, and is now operating on the ISTS. H currents up to 25 mA have been observed with 8-9 (πcm-mrad) lab emittances. An experimental study of surface converter geometries and electron filters at the emitter electrode are planned to optimize source current and emittance.

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