Ballistic transport and solenoidal focusing of intense ion beams for inertial confinement fusion

Journal Article · Wed Jul 15 04:00:00 EDT 1992 · Journal of Applied Physics; (United States)

DOI:https://doi.org/10.1063/1.351867· OSTI ID:7113171

Ottinger, P F; Rose, D V; Neri, J M ^[1]; Olson, C L ^[2]

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1. Plasma Physics Division, Naval Research Laboratory, Washington, DC 20375-5000 (United States)
2. Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)

Light-ion inertial confinement fusion requires beam transport over distances of a few meters for isolation of the diode hardware from the target explosion and for power compression by time-of-flight bunching. This paper evaluates ballistic transport of light-ion beams focused by a solenoidal lens. The ion beam is produced by an annular magnetically insulated diode and is extracted parallel to the axis by appropriate shaping of the anode surface. The beam propagates from the diode to the solenoidal lens in a field-free drift region. The lens alters the ion trajectories such that the beam ballistically focuses onto a target while propagating in a second field-free region between the lens and the target. Ion orbits are studied to determine the transport efficiency {eta}{sub {ital t}} (i.e., the fraction of the beam emitted from the diode which hits the target) under various conditions relevant to light-ion inertial confinement fusion. Analytic results are given for a sharp boundary, finite thickness solenoidal lens configuration, and numerical results are presented for a more realistic lens configuration. From the analytic results, it is found that {eta}{sub {ital t}} can be in the range of 75%--100% for parameter values that appear to be achievable. Numerical results show that using a more realistic magnetic-field profile for the lens yields similar values of {eta}{sub {ital t}} for small radius diodes but significantly reduced values of {eta}{sub {ital t}} for large radius diodes. This reduction results from the radial gradient in the focusing field at larger radius.

• DOE Contract Number: AC04-76DP00789
• OSTI ID: 7113171
• Journal Information: Journal of Applied Physics; (United States), Journal Name: Journal of Applied Physics; (United States) Vol. 72:2; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700411* -- Inertial Confinement Devices-- (1992-)
ANALYTICAL SOLUTION
BEAM FOCUSING MAGNETS
BEAM TRANSPORT
CHARGED PARTICLES
CONFINEMENT
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
EQUIPMENT
INERTIAL CONFINEMENT
ION BEAM FUSION REACTORS
IONS
LIGHT IONS
MAGNETS
NUMERICAL SOLUTION
PLASMA CONFINEMENT
THERMONUCLEAR REACTORS