Hybrid Particle-in-cell/Fluid Method for Intense Ion Beam Transport in Solid Plasmas

doi:10.19596/j.cnki.1001-246x.8609

Abstract

Abstract:

A hybrid particle-in-cell/fluid method is introduced to simulate the transport of intense ion beams in the solid plasmas. A two-dimensional numerical program opic2d-hybrid has been developed and it is used to study the collective behavior of the intense proton beam transport into the polyethylene and solid aluminum targets. It is shown that intense magnetic field is self-generated by the transport of intense proton beam in solid targets. This magnetic field is of benefit to pinch the proton beam. Moreover, due to the production of substantial free-electrons by the target heating and ionization, the stopping power of solid target become weaken, thereby lengthening the proton beam range. On the contrary, the increase of target temperature will reduce the resistivity and thus inhibit the generation of magnetic field. Furthermore, the target ionization leads to much stronger ion-ion scattering effect, thus resulting in the diffusion of protons in transverse space. These effects compete with each other and determine the transport behavior of intense proton beam. At the last, the physical factors contributing to the generation of magnetic field are also analyzed. Some means to increase the strength of magnetic field have been proposed in order to realize the pinch transport of intense proton beams in solid targets.

Key words: intense ion beam transport, hybrid particle-in-cell/fluid simulation, self-generated magnetic field, stopping power

Zhimeng ZHANG, Wei QI, Bo CUI, Bo ZHANG, Wei HONG, Weimin ZHOU. Hybrid Particle-in-cell/Fluid Method for Intense Ion Beam Transport in Solid Plasmas[J]. Chinese Journal of Computational Physics, 2023, 40(2): 210-221.

Figures/Tables 5

Fig.1 (a) Averaged ionization and (b) resistivity of solid aluminum Al and polyethylene CH2 (Here ks =Av =0.2 are adopted for Al while they are ks =2 and Av =10 for CH2.)

Fig.2 The spatial distribution of the magnetic field Bθ and the target temperature Te at t=30 ps, which are caused by the 5 MeV collimated proton beam propagates into the solid CH2 target. The proton current densities are (a)~(b) 109 A·cm-2, (c)~(d) 1011 A·cm-2 and (e)~(f) 1013 A·cm-2

Fig.3 The spatial distribution of the magnetic field Bθ and the target temperature Te at f = 30 ps, which are caused by the 5 MeV collimated proton beam propagates into the solid Al target. The proton current densities are (a)~(b) 109 A·cm-2, (c)~(d) 1011 A·cm-2 and (e)~(f) 1013 A·cm-2

Fig.4 The spatial distribution of the magnetic field Bθ and the target temperature Te at t = 30 ps, which are caused by the 10 MeV collimated proton beam propagates into the solid targets. The proton beam has a waist of 10 μm. The target materials are (a)~(b) CH2 and (c)~(d) Al.

Fig.5 The spatial distribution of the magnetic field Bθ and the target temperature Te at t = 30 ps, which are caused by the 5 MeV collimated proton beam propagates into the solid targets. The proton beam has a current density of 1011 A·cm-2 and a waist of 5 μm. The target materials are (a)~(b) CH2 and (c)~(d) Al.

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