Transverse collective instability in the PSR (Proton Storage Ring)
An instability in the proton storage ring (PSR) is observed as fast loss of beam during accumulation and storage when the injected beam current exceeds a threshold value. Instabilities are observed during both coasting-beam and bunched-beam operation. Large coherent transverse oscillations occur prior to and during the beam loss. The growth times are rapid, typically in the range 10--100 ..mu..s. The instability threshold is observed to depend strongly upon rf voltage, beam size, injected momentum spread and nonlinear fields. Weaker dependences upon betatron tune, vacuum pressure, and stripping-foil bias voltage have also been observed. A possible e-p oscillation component of the unbunched beam instability is suggested. Growth times suggest a significant Re(Z/perpendicular/) of /approximately/0.2--0.5 M..cap omega../m; the source of this is not yet precisely identified. 4 refs., 3 figs., 1 tab.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6276244
- Report Number(s):
- LA-UR-89-1045; CONF-890335-30; ON: DE89009345
- Resource Relation:
- Conference: 13. particle accelerator conference, Chicago, IL, USA, 20 Mar 1989; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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