Envelope description of electron beams in plasma-based accelerators

Journal Article · Thu Jun 01 04:00:00 EDT 1995 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.48288· OSTI ID:253404

Hafizi, B ^[1]; Sprangle, P; Ting, A ^[2]

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1. Icarus Research, P.O. Box 30780, Bethesda, Maryland 20824-0780 (United States)
2. Beam Physics Branch, Plasma Physics Division, Naval Research Laboratory, Washington, DC 20375-5346 (United States)

Analysis of the root-mean-square radius of an electron beam, formed by a plasma-based accelerator, is presented in the context of the paraxial envelope equation. The model includes the effects of acceleration, transverse focusing, self-field forces and scattering by the background. For an arbitrary initial beam emittance, appreciable scalloping of the envelope and spillover of electrons outside the acceptance of the acceleration bucket is possible. Scalloping is significantly reduced by matching the initial beam emittance to the focusing. After sufficiently long acceleration the beam envelope may settle to a constant radius that is stable to small perturbations, while the beam divergence angle declines inversely with the square root of the distance. In this asymptotic regime the radius is given by balancing focusing against the scattering contribution to emittance. Numerical solutions of the envelope equation are presented to show the beam envelope evolution in several examples. {copyright} 1995 {ital American Institute of Physics}.

• Sponsoring Organization: USDOE
• OSTI ID: 253404
• Report Number(s): CONF-940681--
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 335; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATION
BEAM EMITTANCE
BEAM PROFILES
BEAM-PLASMA SYSTEMS
ELECTRODYNAMICS
ELECTRON BEAMS
WAKEFIELD ACCELERATORS