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Title: GEANT4 simulations for beam emittance in a linear collider based on plasma wakefield acceleration

Abstract

Alternative acceleration technologies are currently under development for cost-effective, robust, compact, and efficient solutions. One such technology is plasma wakefield acceleration, driven by either a charged particle or laser beam. However, the potential issues must be studied in detail. In this paper, the emittance evolution of a witness beam through elastic scattering from gaseous media and under transverse focusing wakefields is studied.

Authors:
; ;  [1];  [2]
  1. The University of Manchester, Manchester, United Kingdom and The Cockcroft Institute, Sci-Tech Daresbury, Warrington (United Kingdom)
  2. Nuclear Physics Group, STFC Daresbury Laboratory, Sci-Tech Daresbury, Warrington (United Kingdom)
Publication Date:
OSTI Identifier:
22490074
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 8; 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; BEAM EMITTANCE; CHARGED PARTICLES; COMPUTERIZED SIMULATION; ELASTIC SCATTERING; FOCUSING; LASER RADIATION; LINEAR COLLIDERS; MATHEMATICAL SOLUTIONS; PHOTON BEAMS; PLASMA; WAKEFIELD ACCELERATORS

Citation Formats

Mete, O., E-mail: oznur.mete@manchester.ac.uk, Xia, G., Hanahoe, K., and Labiche, M.. GEANT4 simulations for beam emittance in a linear collider based on plasma wakefield acceleration. United States: N. p., 2015. Web. doi:10.1063/1.4927795.
Mete, O., E-mail: oznur.mete@manchester.ac.uk, Xia, G., Hanahoe, K., & Labiche, M.. GEANT4 simulations for beam emittance in a linear collider based on plasma wakefield acceleration. United States. doi:10.1063/1.4927795.
Mete, O., E-mail: oznur.mete@manchester.ac.uk, Xia, G., Hanahoe, K., and Labiche, M.. 2015. "GEANT4 simulations for beam emittance in a linear collider based on plasma wakefield acceleration". United States. doi:10.1063/1.4927795.
@article{osti_22490074,
title = {GEANT4 simulations for beam emittance in a linear collider based on plasma wakefield acceleration},
author = {Mete, O., E-mail: oznur.mete@manchester.ac.uk and Xia, G. and Hanahoe, K. and Labiche, M.},
abstractNote = {Alternative acceleration technologies are currently under development for cost-effective, robust, compact, and efficient solutions. One such technology is plasma wakefield acceleration, driven by either a charged particle or laser beam. However, the potential issues must be studied in detail. In this paper, the emittance evolution of a witness beam through elastic scattering from gaseous media and under transverse focusing wakefields is studied.},
doi = {10.1063/1.4927795},
journal = {Physics of Plasmas},
number = 8,
volume = 22,
place = {United States},
year = 2015,
month = 8
}
  • The preservation of beam quality in a plasma wakefield accelerator driven by ultrahigh intensity and ultralow emittance beams, characteristic of future particle colliders, is a challenge. The electric field of these beams leads to plasma ions motion, resulting in a nonlinear focusing force and emittance growth of the beam. We propose to use an adiabatic matching section consisting of a short plasma section with a decreasing ion mass to allow for the beam to remain matched to the focusing force. We use analytical models and numerical simulations to show that the emittance growth can be significantly reduced.
  • The performance of a wakefield accelerator in a high energy collider application is analyzed. In order to carry out this task, it is necessary to construct a strawman design system (no matter how preliminary) and build a code of the systems approach (a typical systems code approach was used, for instance, in SSC studies. A nonlinear dynamics map built on a simple theoretical model of the wakefield generated by the laser pulse (or whatever other method) is obtained and we employ this as a base for building a system with multi-stages (and components) as a high energy collider. The crucialmore » figures of merit for such a system other than the final energy include the emittance (that determines the luminosity). The more complex the system is, the more 'opportunities' the system has to degrade the emittance (or entropy of the beam). Thus our map guides us to identify where the crucial elements lie that affect the emittance. We find that a strong focusing force of the wakefield coupled with a possible jitter of the axis (or laser aiming) of each stage and a spread in the betatron frequencies arising from different phase space positions for individual particles leads to a phase space mixing. This sensitively controls the emittance degradation. We show that in the case of a uniform plasma the effect of emittance growth is large and may cause serious problems. We discuss possibilities to avoid it and control the situation.« less
  • Via three-dimensional particle-in-cell simulations, the self-mode-transition of a laser-driven electron acceleration from laser wakefield to plasma-wakefield acceleration is studied. In laser wakefield accelerator (LWFA) mode, an intense laser pulse creates a large amplitude wakefield resulting in high-energy electrons. Along with the laser pulse depletion, the electron bunch accelerated in the LWFA mode drives a plasma wakefield. Then, after the plasma wakefield accelerator mode is established, electrons are trapped and accelerated in the plasma wakefield. The mode transition process and the characteristics of the accelerated electron beam are presented.
  • Transverse-to-longitudinal emittance exchange has promising applications in various advanced acceleration and light source concepts. A proof-of-principle experiment to demonstrate this phase space manipulation method is currently being planned at the Argonne Wakefield Accelerator. The experiment focuses on exchanging a low longitudinal emittance with a high transverse horizontal emittance and also incorporates room for possible parametric studies e.g. using an incoming flat beam with tunable horizontal emittance. In this paper, we present realistic start-to-end beam dynamics simulation of the scheme, explore the limitations of this phase space exchange.
  • The design and current status of experiments to couple the Tapered Hybrid Undulator (THUNDER) to the Lawrence Berkeley National Laboratory (LBNL) laser plasma accelerator (LPA) to measure electron beam energy spread and emittance are presented.