The future of the E-P Instability in the SNS Accumulator Ring

N. Evans & M. Plum
Concerns about the e-p instability drove many decisions during the design of the accumulator ring for Oak Ridge’s Spallation Neutron Source. To date, these decisions seem justified since e-p activity has been observed at the mm scale as a broadband transverse excitation, but it has not been a limiting factor (or even a contributor to normal losses) during operation up to the design power of 1.4 MW. However, the proton power upgrade (PPU) [1] will...
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