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Title: The theory of final focusing of intense light ion beams

Abstract

Efficient transport of the high-power light ion beams of interest to inertial confinement fusion (ICF) experiments may require the use of large radius transport channels. The mismatch in the radii of the transported ion beam and the ICF target requires that the beam be focused following transport. A theoretical description of intense light ion beam focusing with a {ital z}-discharge plasma is presented. The theory is based on a Vlasov equation description of a fully charge- and current-neutralized ion beam, neglecting any angular momentum of the beam ions. An initial ion beam phase-space distribution with adjustable parameters is considered so that its effect upon the phase-space distribution at the focal plane can be analyzed. A numerical code is used to analyze the effect of angular momentum on the focusing properties of the final focusing cell. The theoretical analysis gives expressions for the focal length, for the discharge current required to produce a given degree of focusing, and for the radial number density profiles at the focal plane. The analysis of angular momentum indicates that the focal length and focusing current are not strongly affected even when beam ions have a significant amount of angular momentum.

Authors:
; ;  [1]
  1. Plasma Technology Branch, Naval Research Laboratory, Washington DC 20375 (US)
Publication Date:
OSTI Identifier:
6930895
Resource Type:
Journal Article
Journal Name:
Physics of Fluids B; (USA)
Additional Journal Information:
Journal Volume: 2:2; Journal ID: ISSN 0899-8221
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; INERTIAL CONFINEMENT; ION BEAMS; FOCUSING; ANGULAR MOMENTUM; EFFICIENCY; ION BEAM INJECTION; NUMERICAL SOLUTION; OPTIMIZATION; SPATIAL DISTRIBUTION; BEAM INJECTION; BEAMS; CONFINEMENT; DISTRIBUTION; PLASMA CONFINEMENT; 700208* - Fusion Power Plant Technology- Inertial Confinement Technology

Citation Formats

Watrous, J, Ottinger, P F, and Mosher, D. The theory of final focusing of intense light ion beams. United States: N. p., 1990. Web. doi:10.1063/1.859326.
Watrous, J, Ottinger, P F, & Mosher, D. The theory of final focusing of intense light ion beams. United States. https://doi.org/10.1063/1.859326
Watrous, J, Ottinger, P F, and Mosher, D. 1990. "The theory of final focusing of intense light ion beams". United States. https://doi.org/10.1063/1.859326.
@article{osti_6930895,
title = {The theory of final focusing of intense light ion beams},
author = {Watrous, J and Ottinger, P F and Mosher, D},
abstractNote = {Efficient transport of the high-power light ion beams of interest to inertial confinement fusion (ICF) experiments may require the use of large radius transport channels. The mismatch in the radii of the transported ion beam and the ICF target requires that the beam be focused following transport. A theoretical description of intense light ion beam focusing with a {ital z}-discharge plasma is presented. The theory is based on a Vlasov equation description of a fully charge- and current-neutralized ion beam, neglecting any angular momentum of the beam ions. An initial ion beam phase-space distribution with adjustable parameters is considered so that its effect upon the phase-space distribution at the focal plane can be analyzed. A numerical code is used to analyze the effect of angular momentum on the focusing properties of the final focusing cell. The theoretical analysis gives expressions for the focal length, for the discharge current required to produce a given degree of focusing, and for the radial number density profiles at the focal plane. The analysis of angular momentum indicates that the focal length and focusing current are not strongly affected even when beam ions have a significant amount of angular momentum.},
doi = {10.1063/1.859326},
url = {https://www.osti.gov/biblio/6930895}, journal = {Physics of Fluids B; (USA)},
issn = {0899-8221},
number = ,
volume = 2:2,
place = {United States},
year = {Thu Feb 01 00:00:00 EST 1990},
month = {Thu Feb 01 00:00:00 EST 1990}
}