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Title: Effect of beam emittance on self-modulation of long beams in plasma wakefield accelerators

The initial beam emittance determines the maximum wakefield amplitude that can be reached as a result of beam self-modulation in the plasma. The wakefield excited by the fully self-modulated beam decreases linearly with the increase in the beam emittance. There is a value of initial emittance beyond which the self-modulation does not develop even if the instability is initiated by a strong seed perturbation. The emittance scale at which the wakefield is suppressed by a factor of two with respect to the zero-emittance case (the so called critical emittance) is determined by inability of the excited wave to confine beam particles radially and is related to beam and plasma parameters by a simple formula. The effect of beam emittance can be observed in several discussed self-modulation experiments.
Authors:
 [1] ;  [2]
  1. Novosibirsk State University, 630090 Novosibirsk (Russian Federation)
  2. (Russian Federation)
Publication Date:
OSTI Identifier:
22489951
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 12; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AMPLITUDES; BEAM EMITTANCE; DISTURBANCES; MODULATION; PARTICLE BEAMS; PLASMA; PLASMA INSTABILITY; WAKEFIELD ACCELERATORS