Abstract
A very fast damping of beam envelope oscillation amplitudes was recently observed in simulations of high intensity beam transport, through periodic FODO cells, in mismatched conditions [V. Variale, Nuovo Cimento Soc. Ital. Fis. 112A, 1571--1582 (1999) and T. Clauser et al., in Proceedings of the Particle Accelerator Conference, New York, 1999 (IEEE, Piscataway, NJ, 1999), p. 1779]. A Landau damping mechanism was proposed at the origin of observed effect. In this paper, to further investigate the source of this fast damping, extensive simulations have been carried out. The results presented here support the interpretation of the mechanism at the origin of the fast damping as a Landau damping effect.
Highlights
High intensity charged-particle beams can develop extended low-density halos [1]
The discrepancies found between the multiparticle code and particle core model (PCM) results were mainly due to the following reasons: In PARMT simulations, the breathing mode oscillations, due to the mismatch of the input beam with the periodic cells, damped very quickly when the beam space charge was strong enough
The simulation results confirm that the damping effect shown in some cases is a consequence of the Landau mechanism of stabilization
Summary
High intensity charged-particle beams can develop extended low-density halos [1]. The existence of halos can have serious consequences in particle accelerators. Multiparticle code simulations have shown that beam envelope oscillations, caused by mismatching with the periodic transport channel, can damp on a very fast time scale [4,5]. In these references, a continuous beam was transported through hundreds of FODO periodic cells. The discrepancies found between the multiparticle code and PCM results were mainly due to the following reasons: In PARMT simulations, the breathing mode oscillations, due to the mismatch of the input beam with the periodic cells, damped very quickly when the beam space charge was strong enough. The damping strength is proportional to the value of the frequency distribution function fvbtaken at the excitation frequency v
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