Advanced RF-driven H- ion sources at the SNS

The US spallation neutron source* (SNS), will require substantially higher average and pulse H" beam current than can be produced from conventional H - ion sources such as the baseline LBNL-SNS source. H - currents of 70-100 mA with an RMS emittance of 0.20-0.35 π mm mrad and a ˜7% duty-factor...

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Bibliographic Details
Published in:	2007 IEEE Particle Accelerator Conference (PAC) pp. 3774 - 3776
Main Authors:	Welton, R.F., Stockli, M.P., Murray, S.N., Pennisi, T.R., Han, B., Kang, Y., Goulding, R.H., Crisp, D.W., Luciano, N.P., Carmichael, J.R., Carr, J.
Format:	Conference Proceeding
Language:	English
Published:	IEEE 01-06-2007
Subjects:	Aperture antennas Ion accelerators Ion sources Magnetic confinement Magnetic separation Plasma accelerators Plasma confinement Plasma sources Plasma stability Radio frequency
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Summary:	The US spallation neutron source* (SNS), will require substantially higher average and pulse H" beam current than can be produced from conventional H - ion sources such as the baseline LBNL-SNS source. H - currents of 70-100 mA with an RMS emittance of 0.20-0.35 π mm mrad and a ˜7% duty-factor will be needed for the SNS power upgrade project in 2010. We are therefore investigating several advanced ion source concepts based on RF plasma excitation. First, a generalized discussion of our source development strategy is presented as well as the performance characteristics of a large-plasma-volume, external antenna source based on an AI 2 O 3 plasma chamber. The design and results of computational modeling of a high-power version of this source featuring an AlN plasma chamber is subsequently discussed as well as a high-efficiency extraction system necessary for high- current operation.
ISBN:	1424409160 9781424409167
ISSN:	1944-4680 2152-9582
DOI:	10.1109/PAC.2007.4439908