Filamentation instability of rotating light ion beam

Filamentation instability for a rotating light ion beam (LIB) fusion system is investigated. Stability conditions, including the effects of fractional current neutralization, rotation of LIB and beam temperature, are derived for propagation through a background plasma. The results are illustrated by plotting stability boundaries for a rotating proton beam propagating in a plasma.

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Two-stream and filamentation instabilities for a light ion beam—plasma system

Journal of Plasma Physics ◽

10.1017/s0022377800012253 ◽

1987 ◽

Vol 37 (3) ◽

pp. 373-382 ◽

Cited By ~ 14

Author(s):

Toshio Okada ◽

Winfried Schmidt

Keyword(s):

Proton Beam ◽

Size Effects ◽

Ion Beam ◽

Plasma Heating ◽

Finite Size ◽

Stability Conditions ◽

Plasma System ◽

Finite Size Effects ◽

Stability Boundaries ◽

Gas Discharges

Electrostatic two-stream and electromagnetic filamentation instabilities for a light ion beam penetrating a plasma are investigated. The dispersion relations of these instabilities including the effect of plasma heating by the ion beam are solved analytically and numerically. Stability conditions are derived for propagation through a plasma. Attention is paid to the finite size effects of beams with small diameters of the order 0·1 cm typical for pinched gas discharges. The results are illustrated by plotting stability boundaries for a 100 keV proton beam propagating through a plasma.

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Preferential acceleration of positrons by a filamentation instability between an electron–proton beam and a pair plasma beam

Physics of Plasmas ◽

10.1063/5.0021257 ◽

2020 ◽

Vol 27 (12) ◽

pp. 122102

Author(s):

M. E. Dieckmann ◽

S. J. Spencer ◽

M. Falk ◽

G. Rowlands

Keyword(s):

Proton Beam ◽

Plasma Beam ◽

Pair Plasma ◽

Filamentation Instability

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Encapsulated Sulfur targets for light ion beam experiments

EPJ Web of Conferences ◽

10.1051/epjconf/202022903004 ◽

2020 ◽

Vol 229 ◽

pp. 03004

Author(s):

Sandile Jongile ◽

Ntombizonke Kheswa ◽

Paul Papka ◽

Olivier Sorlin ◽

Antoine Lemasson ◽

...

Keyword(s):

Surface Area ◽

Proton Beam ◽

Energy Deposition ◽

Ion Beam ◽

Beam Irradiation ◽

Initial Thickness ◽

Minimum Loss ◽

Analysis Technique ◽

Beam Analysis ◽

Homogeneous Irradiation

A new method was developed to produce enriched Sulfur targets with minimum loss of material. This was made possible by inserting Sulfur in-between two 0.5 μm Mylar foils (C10H8O4). The initial aim was to ensure that the Sulfur targets reduce by no more than 50% of the initial thickness within 24 hours under the equivalent of 10 J/cm2 of integrated energy deposition by an energetic (Eb > 50 MeV) proton beam. There is no loss of enriched material while making the target, as all the material is deposited within the surface area to be exposed to the beam. During beam irradiation, the targets were frequently swivelled in order to expose each part of the target to the beam and achieve homogeneous irradiation. Targets of 0.4 mg/cm2 thickness were produced and characterised using ion beam analysis technique with a 3 MeV proton beam.

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