Observations and Simulations of Transverse Density Waves in a Collimated Space-Charge Dominated Electron Beam

Journal Article · Sat May 01 00:00:00 EDT 1999 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.82.4002· OSTI ID:341409

Bernal, S; Kishek, R A; Reiser, M ^[1]; Haber, I ^[2]

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1. Institute for Plasma Research, University of Maryland, College Park, Maryland 20742 (United States)
2. Naval Research Laboratory, Washington, D.C. 20375 (United States)

Experiments and particle-in-cell simulations demonstrate the appearance of wavelike transverse density variations in a space-charge dominated electron beam. Simulations show how an aperture located near the source gives rise to a nonequilibrium phase-space distribution with strong force imbalance confined to a sheath near the beam edge. Tracking of particles in this sheath, starting near the aperture{close_quote}s edge, reproduces well the onset of the perturbation. The subsequent evolution of the perturbation over about one meter suggests the appearance of a transverse wave. For the parameters investigated, simulations further indicate that the perturbation damps out over a few plasma periods without causing any rms emittance growth. {copyright} {ital 1999} {ital The American Physical Society}

• OSTI ID: 341409
• Journal Information: Physical Review Letters, Vol. 82, Issue 20; Other Information: PBD: May 1999
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ELECTRON BEAMS
BEAM TRANSPORT
SPACE CHARGE
WAVE PROPAGATION
BEAM EMITTANCE
PLASMA SIMULATION
COMPUTERIZED SIMULATION
ELECTRON DENSITY