The propagation of a charged particle beam is accompanied by the production of secondary particles created in the interaction of the beam itself with the background gas flowing in the accelerator tube. In the drift region, where the electric field of the electrodes is negligible, this production results in an accumulation of space charge and a consequent creation of a plasma shielding the self induced potential of the charged beam. This phenomenon, known as space charge compensation (SCC) is a typical issue in accelerator physics, where it is usually addressed by means of 1D radial transport codes [1] or Monte Carlo codes [2]. The present paper describes some theoretical studies on this phenomenon, also presenting a PIC-Monte Carlo code investigating the space charge neutralization of a beam in a 2D domain on the zx plane, z being the beam axis. With respect to the classical 2D xy transversal simulations, the particular geometry chosen allows to investigate the beam parallel dynamics of plasma particles. A two time scale approach also gives the possibility to analyze the transient phase of the SCC as well as the mechanisms regulating the phenomenon at regime. These peculiarities of the model, offering a new insight on the problem, are described and the results discussed. REFERENCES 1. N. Chauvin et al. "Beam dynamic simulation of the low energy beam transport line for IFMIF/EVEDA". In Proceeding of LINAC Conference 2008. 2. J. L. Vay and C. Deutsch. "Charge compensated ion beam propagation in a reactor sized chamber". Physics of Plasma, 5, 1998.
Study of space charge compensation phenomena in charged particle beams
Serianni G
2011
Abstract
The propagation of a charged particle beam is accompanied by the production of secondary particles created in the interaction of the beam itself with the background gas flowing in the accelerator tube. In the drift region, where the electric field of the electrodes is negligible, this production results in an accumulation of space charge and a consequent creation of a plasma shielding the self induced potential of the charged beam. This phenomenon, known as space charge compensation (SCC) is a typical issue in accelerator physics, where it is usually addressed by means of 1D radial transport codes [1] or Monte Carlo codes [2]. The present paper describes some theoretical studies on this phenomenon, also presenting a PIC-Monte Carlo code investigating the space charge neutralization of a beam in a 2D domain on the zx plane, z being the beam axis. With respect to the classical 2D xy transversal simulations, the particular geometry chosen allows to investigate the beam parallel dynamics of plasma particles. A two time scale approach also gives the possibility to analyze the transient phase of the SCC as well as the mechanisms regulating the phenomenon at regime. These peculiarities of the model, offering a new insight on the problem, are described and the results discussed. REFERENCES 1. N. Chauvin et al. "Beam dynamic simulation of the low energy beam transport line for IFMIF/EVEDA". In Proceeding of LINAC Conference 2008. 2. J. L. Vay and C. Deutsch. "Charge compensated ion beam propagation in a reactor sized chamber". Physics of Plasma, 5, 1998.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
