A Negative Hydrogen-Ion Source for SNS Using a Helicon Plasma Generator

Conference · Mon Jan 01 00:00:00 EST 2007

OSTI ID:1128948

Goulding, Richard Howell ^[1]; Welton, Robert F ^[1]; Baity, Jr, F Wallace ^[1]; Crisp, Danny W ^[1]; Fadnek, Andy ^[1]; Kang, Yoon W ^[1]; Murray, Jr, S N ^[1]; Sparks, Dennis O ^[1]; Stockli, Martin P ^[1]

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1. ORNL

The Spallation Neutron Source (SNS) at Oak Ridge National Labo ratory is a world-class facility for materials research based on neutron scattering. It consists of a negative hydrogen (H-) ion source, linear accelerator, proton accumulator ring, and liquid Hg target. A power up grade is planned for the device, which will require significant improvements in the negative ion source, including the production of H- beam currents of 70-95 mA (~2 the present SNS source value), with a pulse length of 1 ms and duty factor of ~ 7%. No H- sources currently in existence meet these combined requirements. A proof-of-principle experiment is being constructed in which the rf inductive plasma generator in the present source is replaced by a helicon plasma generator. This is expected to produce a factor of three or better in crease in the maximum source plasma density at a reduced rf power level, resulting in significantly increased negative ion current with reduced heat removal requirements.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1128948
• Resource Relation: Conference: 17th Topical Conference on Radio Frequency Power in Plasmas, Clearwater, FL, USA, 20070507, 20070509
• Country of Publication: United States
• Language: English