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TY - CONF AU - Han, B. AU - Cousineau, S.M. AU - Murray, S.N. AU - Pennisi, T.R. AU - Sarmento, T.M. AU - Stinson, C. AU - Stockli, M.P. AU - Tarvainen, O.A. AU - Welton, R.F. ED - Yamazaki, Yoshishige ED - Raubenheimer, Tor ED - McCausey, Amy ED - Schaa, Volker RW TI - Tests of Cs-Free Operation of the SNS RF H⁻ Ion Sources J2 - Proc. of NAPAC2019, Lansing, MI, USA, 01-06 September 2019 CY - Lansing, MI, USA T2 - North American Particle Accelerator Conference T3 - 4 LA - english AB - Tests were performed at SNS in collaboration with visiting colleagues from ISIS, UK to evaluate the uncesiated beam performance of the SNS RF H⁻ ion sources. Two spare experimental sources, one with internal antenna and one with external antenna were used for the tests. The beam currents achieved with Cs-free operations accounted for about 1/3 to 1/2 of the beam currents produced with cesiated operations. ~17 mA uncesiated H⁻ current was demonstrated within the tested RF power range up to 65 kW with the internal antenna source and ~15 mA with up to 40 kW RF with the external antenna source. In Cs-free operations, the power supply for the electron dumping electrode was loaded down below its set voltage but was not too drastic to tamper the operation. PB - JACoW Publishing CP - Geneva, Switzerland SP - 184 EP - 187 KW - operation KW - ion-source KW - plasma KW - neutron KW - power-supply DA - 2019/10 PY - 2019 SN - 2673-7000 SN - 978-3-95450-223-3 DO - doi:10.18429/JACoW-NAPAC2019-MOPLH08 UR - http://jacow.org/napac2019/papers/moplh08.pdf ER -