Title :
Advanced RF-driven H- ion sources at the SNS
Author :
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.
Author_Institution :
Oak Ridge Nat. Lab., Oak Ridge
Abstract :
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 AI2O3 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.
Keywords :
antennas in plasma; ion beams; ion sources; neutron sources; particle beam extraction; plasma sources; Al2O3 plasma chamber; AlN plasma chamber; RF plasma excitation; RFdriven H- ion sources; SNS; baseline LBNL-SNS source; external antenna source; extraction system; ion beam current; spallation neutron source; Aperture antennas; Ion accelerators; Ion sources; Magnetic confinement; Magnetic separation; Plasma accelerators; Plasma confinement; Plasma sources; Plasma stability; Radio frequency;
Conference_Titel :
Particle Accelerator Conference, 2007. PAC. IEEE
Conference_Location :
Albuquerque, NM
Print_ISBN :
978-1-4244-0916-7
DOI :
10.1109/PAC.2007.4439908
