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Propagation of intense plasma and ion beams across B-field in vacuum and magnetized plasma

Published online by Cambridge University Press:  07 June 2005

M. ANDERSON ,
E. GARATE ,
N. ROSTOKER ,
Y. SONG ,
A. VAN DRIE  and
VITALY BYSTRITSKII
M. ANDERSON
Affiliation:
Department of Physics and Astronomy, University of California, Irvine
E. GARATE
Affiliation:
Department of Physics and Astronomy, University of California, Irvine
N. ROSTOKER
Affiliation:
Department of Physics and Astronomy, University of California, Irvine
Y. SONG
Affiliation:
Department of Physics and Astronomy, University of California, Irvine
A. VAN DRIE
Affiliation:
Department of Physics and Astronomy, University of California, Irvine
VITALY BYSTRITSKII
Affiliation:
Tri Alpha Energy Inc., Foothill Ranch, California
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Abstract

This paper summarizes experimental results on the injection and transport of intense, wide cross-section H+ plasma (PB), and ion beams (IB), in vacuum and ambient H+ plasma across an applied B-field. The injection of plasma and ion beams into magnetic confinement devices have the potential to heat and support current in these systems (e.g., field-reversed configurations). The translational energies of the PB and IB ranged between Epb = 60 to 120 eV and EIB = 60 to 120 keV, with temperatures and densities in the range of Tb ∼ 2 to 10 eV, nb ∼ 1012 to 1013 cm−3, and Tb ∼ 200 eV, nb 1010 to 1011 cm−3, respectively. Compared to earlier studies (Peter et al., 1979; Wessel et al., 1988, 1990), this research extends the experimental parameter space to higher beam current densities (up to 30 A/cm2) and higher B-field strengths up to 1.6 kG. The PB and IB were both about 10 cm in diameter at the injection port, and the ratio of beam specific energy to ambient B-field specific energy, β, was in the range of 0.1 to 10. Ratios of beam Larmor radius to beam size, ρ, ranged from 10−1 to 1 and 1 to 10 for the PB and IB, respectively. Cross B-field propagation of the PB in vacuum was undeflected as a whole with a sharp increase (one order or more) in the current density of the central beam core at B-field levels > 1 kG accompanied by a significant loss of beam peripheral layers, beam “braking” and preferential beam expansion along the B-field lines. Cross B-field propagation of the PB in ambient plasma did not differ substantially from the case without B-field, that is, no deflection of the PB as a whole, which could be due to an insufficient neutralization of the induced E-field inside the PB. Cross B-field propagation of the IB in ambient plasma followed a single particle trajectory deflection with a simultaneous significant loss of IB intensity without any detectable bunching, indicating an adequate shorting of the polarization E-field inside the IB.

Keywords

Ion beamPlasma beamTransport across B-field
Type
Research Article
Information
Laser and Particle Beams , Volume 23 , Issue 2 , June 2005 , pp. 117 - 129
Copyright
2005 Cambridge University Press

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References

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