| J. D. Sherman, W. B. Ingalls, G. Rouleau, and H. V. Smith, Jr., LANL, Los Alamos, NM, USA J. Thomason and R. Sidlow, ISIS Facility, Rutherford Appleton Laboratory, Oxfordshire, UK R. Ferdinand and R. Gobin, CEA-Saclay, Gif sur Yvette Cedex, France |
The Penning H- surface plasma source (SPS) is used at Rutherford Appleton Laboratory (RAL) to provide required H- beams for charge-exchange injection into the 800-MeV proton synchrotron on the ISIS spallation neutron source. The RAL source is based on the first HPenning SPS operated at Los Alamos. Since the original technology exchange, Los Alamos has developed scaledup versions of the Penning H- SPS with the goal of extending the H- beam duty factor (df) while maintaining high beam brightness. A 250-mA H- beam with rms normalized emittance of <0.3 (ðmm-mrad) in both transverse planes has been extracted from a 4X scaled Penning source at a discharge df of 0.5%. Using discharge scaling laws and the 250-mA results, it is predicted that a 4X Penning H- SPS with a slit emitter would be capable of producing >100-mA, low emittance H- beams in the 5% df range. |
