PSR experience with beam losses, instabilities and space charge effects

Details PSR experience with beam losses, instabilities and space charge effects PSR experience with beam losses, instabilities and space charge effects

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..448..116m&link_type=abstract

Workshop on space charge physics in high intensity hadron rings. AIP Conference Proceedings, Volume 448, pp. 116-127 (1998).

Physics

3

Storage Rings, Beam Handling, Beam Transport, Beam Dynamics, Collective Effects And Instabilities

Scientific paper

Average current from the PSR has been limited to ~70 μA at 20 Hz by beam losses of 0.4 to 0.5 μA which arise from two principal causes, production of H0 excited states and stored-beam scattering in the stripper foil. To reduce beam losses, an upgrade from the two-step H0 injection to direct H- injection is underway and will be completed in 1998. Peak intensity from the PSR is limited by a strong instability that available evidence indicates is the two-stream e-p instability. New evidence for the e-p hypothesis is presented. At operating intensities, the incoherent space charge tune shift depresses both horizontal and vertical tunes past the integer without additional beam loss although some intensity-dependent emittance growth is observed.

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