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@InProceedings{han:napac2019-moplh08, author = {B. Han and S.M. Cousineau and S.N. Murray and T.R. Pennisi and T.M. Sarmento and C. Stinson and M.P. Stockli and O.A. Tarvainen and R.F. Welton}, % author = {B. Han and S.M. Cousineau and S.N. Murray and T.R. Pennisi and T.M. Sarmento and C. Stinson and others}, % author = {B. Han and others}, title = {{Tests of Cs-Free Operation of the SNS RF H\textsuperscript{--} Ion Sources}}, booktitle = {Proc. NAPAC'19}, pages = {184--187}, paper = {MOPLH08}, language = {english}, keywords = {operation, ion-source, plasma, neutron, power-supply}, venue = {Lansing, MI, USA}, series = {North American Particle Accelerator Conference}, number = {4}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {10}, year = {2019}, issn = {2673-7000}, isbn = {978-3-95450-223-3}, doi = {10.18429/JACoW-NAPAC2019-MOPLH08}, url = {http://jacow.org/napac2019/papers/moplh08.pdf}, note = {https://doi.org/10.18429/JACoW-NAPAC2019-MOPLH08}, abstract = {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.}, }