Periodic magnetic focusing of sheet electron beams

Journal Article · Sun May 01 04:00:00 EDT 1994 · Physics of Plasmas; (United States)

DOI:https://doi.org/10.1063/1.870675· OSTI ID:6645115

Booske, J H; Basten, M A; Kumbasar, A H ^[1]; Antonsen, Jr, T M; Bidwell, S W; Carmel, Y; Destler, W W; Granatstein, V L; Radack, D J ^[2]

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1. Electrical and Computer Engineering, University of Wisconsin---Madison, Madison, Wisconsin 53706 (United States)
2. Laboratory for Plasma Research, University of Maryland, College Park, Maryland 20742-3511 (United States)

Sheet electron beams focused by periodically cusped magnetic (PCM) fields are stable against low-frequency velocity-shear instabilities (such as the diocotron mode). This is in contrast to the more familiar unstable behavior in uniform solenoidal magnetic fields. A period-averaged analytic model shows that a PCM-focused beam is stabilized by ponderomotive forces for short PCM periods. Numerical particle simulations for a semi-infinite sheet beam verify this prediction and also indicate diocotron stability for long PCM periods is less constraining than providing for space-charge confinement and trajectory stability in the PCM focusing system. In this article the issue of beam matching and side focusing for sheet beams of finite width is also discussed. A review of past and present theoretical and experimental investigations of sheet-beam transport is presented.

• OSTI ID: 6645115
• Journal Information: Physics of Plasmas; (United States), Journal Name: Physics of Plasmas; (United States) Vol. 1:5; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

661220* -- Particle Beam Production & Handling
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BEAM FOCUSING MAGNETS
BEAM TRANSPORT
BEAMS
CUSPED GEOMETRIES
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
ELECTRON BEAMS
EQUIPMENT
FOCUSING
HISTORICAL ASPECTS
LEPTON BEAMS
MAGNETIC FIELD CONFIGURATIONS
MAGNETS
OPEN CONFIGURATIONS
PARTICLE BEAMS
PLASMA SIMULATION
PONDEROMOTIVE FORCE
SIMULATION
Ta
Targets-- (1992-)