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TY - CONF AU - Kleinjan, D. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Arc and Convertor Current Transient Studies for Multi-cusp Cesiated Surface Conversion H⁻ Source at Lansce J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The Multi-cusp Cesiated Surface Conversion H⁻ Ion Source at the Los Alamos Neutron Science Center (LANSCE) has provided beam at ~14 mA, 120 Hz, and 10% D.F. for many years of neutron science research. Recently, random high current transients were discovered in the arc current used to ionize hydrogen in the LANSCE H⁻ ion source, and in the convertor current used to convert protons to H⁻ ions. Most have no effect, but more severe transients can cripple beam output. Hypothesized causes are related to cesiation effects, plasma potential changes, tungsten filament vaporation/sputtering, or from the pulsed power system. A dedicated study was recently done on the LANSCE H⁻ Ion source test stand to determine the cause of these transients. Current understanding indicates that the more severe transients come from a combination of cesiation effects and plasma potential changes. The status of these current transient studies on the LANSCE H⁻ ion source will be discussed. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1983 EP - 1985 KW - ion-source KW - operation KW - plasma KW - extraction KW - electron DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPTS025 UR - http://jacow.org/ipac2019/papers/tupts025.pdf ER -