Ion-beam plasma and the propagation of intense compensated ion beams

Gabovich, M. D.

doi:10.1070/pu1977v020n02abeh005331

Cited by 15 publications

(17 citation statements)

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“…The presence of cold, "fresh" plasma in the beam path provides the minimum space-charge potential and the best option for neutralized ballistic focusing. Experimental studies of ballistic transverse focusing have confirmed that the best neutralization results are achieved when volumetric plasma is used everywhere along the beam path to assure robust charge neutralization 43,44 . Hence, in the following we only study the case when a large amount of cold background plasma is available everywhere along the beam path.…”

Section: Iid Neutralization By a Volumetric Plasmamentioning

confidence: 85%

“…Neutralization and focusing of intense charge particle beams by background plasma form the basis for a variety of applications to high-energy accelerators and colliders, 1,2,3 astrophysics 4,5,6,7 , inertial confinement fusion, in particular, fast ignition 8 and heavy ion fusion, 9,10,11,12 magnetic fusion based on field-reversed configurations fueled by energetic ion beams 13 , the physics of solar flares 14 , highintensity high-energy particle beam propagation in the atmosphere and outer-space plasmas 15 , as well as basic plasma physics phenomena 16 . For instance, one of the modern approaches to ion beam compression for heavy ion fusion applications is to use a dense background plasma which charge neutralizes the ion charge bunch, and hence facilitates compression of the charge bunch against strong space-charge forces 9,10,17,18,19,20 .…”

Section: Introductionmentioning

confidence: 99%

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Physics of Neutralization of Intense High-Energy Ion Beam Pulses by Electrons

Kaganovich¹,

C.²,

Dorf³

et al. 2010

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Neutralization and focusing of intense charged particle beam pulses by electrons forms the basis for a wide range of applications to high energy accelerators and colliders, heavy ion fusion, and astrophysics. For example, for ballistic propagation of intense ion beam pulses, background plasma can be used to effectively neutralize the beam charge and current, so that the self-electric and self-magnetic fields do not affect the ballistic propagation of the beam. From the practical perspective of designing advanced plasma sources for beam neutralization, a robust theory should be able to predict the self-electric and self-magnetic fields during beam propagation through the background plasma. The major scaling relations for the self-electric and self-magnetic fields of intense ion charge bunches propagating through background plasma have been determined taking into account the effects of transients during beam entry into the plasma, the excitation of collective plasma waves, the effects of gas ionization, finite electron temperature, and applied solenoidal and dipole magnetic fields. Accounting for plasma production by gas ionization yields a larger self-magnetic field of the ion beam compared to the case without ionization, and a wake of current density and self-magnetic field perturbations is generated behind the beam pulse. A solenoidal magnetic field can be applied for controlling the beam propagation. Making use of theoretical models and advanced numerical simulations, it is shown that even a small applied magnetic field of about 100G can strongly affect the beam neutralization. It has also been demonstrated that in the presence of an applied magnetic field the ion beam pulse can excite large-amplitude whistler waves, thereby producing a complex structure of self-electric and self-magnetic fields. The presence of an applied solenoidal magnetic field may also cause a strong enhancement of the radial self-electric field of the beam pulse propagating through the background plasma. If controlled, this physical effect can be used for optimized beam transport over long distances.

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Section: Iid Neutralization By a Volumetric Plasmamentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Physics of Neutralization of Intense High-Energy Ion Beam Pulses by Electrons

Kaganovich¹,

C.²,

Dorf³

et al. 2010

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“…Experimental studies of ballistic transverse focusing have confirmed that the best results are achieved when both a plasma plug and a bulk plasma are used for charge neutralization. 8,11 Hence, in the following we only study the case when a large amount of cold background plasma is available everywhere on the beam path.…”

Section: Introductionmentioning

confidence: 99%

“…For longer ion pulses, the plasma ion response may effect the plasma return current. 11,31,32 The organization of this paper is as follows: In Sec. II, the basic equations and model are discussed.…”

Section: Introductionmentioning

confidence: 99%

“…Neutralization of the beam charge and current by a background plasma is an important issue for many applications involving the transport of fast particles in plasmas, including astrophysics, 1-4 accelerators, 4,5 and inertial fusion, in particular, fast ignition 6 and heavy ion fusion, 7,8 magnetic fusion based on field reversed configurations fueled by energetic ion beams, 9 the physics of solar flares, 10 as well as basic plasma physics phenomena. 11 Previous studies have explored the option of ion beam pulse neutralization by passing the beam pulse through a layer of plasma or a plasma plug. 12 The ion beam pulse extracts electrons from the plasma plug and drags electrons along during its motion outside the plasma plug region.…”

Section: Introductionmentioning

confidence: 99%

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Controlling charge and current neutralization of an ion beam pulse in a background plasma by application of a solenoidal magnetic field: Weak magnetic field limit

et al. 2008

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Propagation of an intense charged particle beam pulse through a background plasma is a common problem in astrophysics and plasma applications. The plasma can effectively neutralize the charge and current of the beam pulse, and thus provides a convenient medium for beam transport. The application of a small solenoidal magnetic field can drastically change the self-magnetic and self-electric fields of the beam pulse, thus allowing effective control of the beam transport through the background plasma. An analytic model is developed to describe the self-magnetic field of a finite-length ion beam pulse propagating in a cold background plasma in a solenoidal magnetic field. The analytic studies show that the solenoidal magnetic field starts to influence the self-electric and self-magnetic fields when ωce≳ωpeβb, where ωce=eB∕mec is the electron gyrofrequency, ωpe is the electron plasma frequency, and βb=Vb∕c is the ion beam velocity relative to the speed of light. This condition typically holds for relatively small magnetic fields (about 100G). Analytical formulas are derived for the effective radial force acting on the beam ions, which can be used to minimize beam pinching. The results of analytic theory have been verified by comparison with the simulation results obtained from two particle-in-cell codes, which show good agreement.

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