Physical Insights and Test Stand Results for the LANSCE H− Surface Converter Source | Zendy

Joseph D. Sherman | Zendy

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Physical Insights and Test Stand Results for the LANSCE H− Surface Converter Source

Author(s) -

Joseph D. Sherman

Publication year - 2005

Publication title -

aip conference proceedings

Language(s) - English

Resource type - Conference proceedings

SCImago Journal Rank - 0.177

H-Index - 75

eISSN - 1551-7616

pISSN - 0094-243X

DOI - 10.1063/1.1908301

Subject(s) - thermal emittance , upgrade , physics , linear particle accelerator , beam emittance , duty cycle , beam (structure) , particle accelerator , spallation neutron source , neutron source , nuclear physics , nuclear engineering , optics , neutron , computer science , voltage , engineering , quantum mechanics , operating system

The Los Alamos Neutron Science Center (LANSCE) H− surface converter source upgrade project has been ongoing for several years to reach 25–40 mA current with 7(πcm‐mrad) lab emittance (95% beam fraction). The duty factor is 12% (120 Hz, 1ms pulse length). Summary test stand results and interpretations for a six filament axial extraction H− source are presented. This source did produce 40‐mA H− current, but with unacceptable emittance growth. More recently a fourth modified LANSCE H− production source with radial H− extraction system has been constructed, and is presently undergoing tests. Currents up to 25mA H− have been observed with 20% emittance growth. This emittance growth may be acceptable for 800 MeV linac operations. A summary of physical principles of emittance growth mechanisms and converter physics are given.

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