Observation of a H- Beam Ion Instability

Details Observation of a H- Beam Ion Instability Observation of a H- Beam Ion Instability

2000-08-19

arxiv.org/abs/physics/0008173v1

eConf C000821:THB22,2000

Physics

Accelerator Physics

Linac2000 THB22

Scientific paper

We report the results of observations of H- beam instabilities at the Fermilab Linac. By intentionally creating "high" background pressure with different gases in the 750 keV transport line we observed coherent transverse beam oscillations. The minimal pulse length required to observe oscillations and the frequency of oscillations are functions of pressure and mass of the background gas. The oscillations are present in both transverse planes and very quickly reach saturation in amplitude growth. The observed characteristics of beam oscillations are in quantitative agreement with "fast beam-ion instability" described by Raubenheimer and Zimmermann. Effects described here are occur far from the normal operating range of the Fermilab Linac but may be important for many future high intensity accelerators.

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