skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Head erosion with emittance growth in PWFA

Abstract

Head erosion is one of the limiting factors in plasma wakefield acceleration (PWFA). We present a study of head erosion with emittance growth in field-ionized plasma from the PWFA experiments performed at the FACET user facility at SLAC. At FACET, a 20.3 GeV bunch with 1.8 Multiplication-Sign 10{sup 10} electrons is optimized in beam transverse size and combined with a high density lithium plasma for beam-driven plasma wakefield acceleration experiments. A target foil is inserted upstream of the plasma source to increase the bunch emittance through multiple scattering. Its effect on beamplasma interaction is observed with an energy spectrometer after a vertical bend magnet. Results from the first experiments show that increasing the emittance has suppressed vapor field-ionization and plasma wakefields excitation. Plans for the future are presented.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1];  [2];  [3]
  1. SLAC National Accelerator Laboratory, Menlo Park, CA 94025 (United States) and SLAC National Accelerator Laboratory, Menlo Park, CA 94025 (United States) and University of Oslo, Oslo, N-0316 (Norway) and SLAC National Accelerator Laboratory, Menlo Park, CA 94025 (United States)
  2. (Germany)
  3. (United States)
Publication Date:
OSTI Identifier:
22075891
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1507; Journal Issue: 1; Conference: 15. advanced accelerator concepts workshop, Austin, TX (United States), 10-15 Jun 2012; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ACCELERATION; BEAM BUNCHING; BEAM EMITTANCE; BEAM TRANSPORT; BEAM-PLASMA SYSTEMS; ELECTRONS; EROSION; EXCITATION; GEV RANGE; IONIZATION; LITHIUM; MULTIPLE SCATTERING; PLASMA; PLASMA DENSITY; PLASMA GUNS; STANFORD LINEAR ACCELERATOR CENTER; WAKEFIELD ACCELERATORS

Citation Formats

Li, S. Z., Adli, E., England, R. J., Frederico, J., Gessner, S. J., Hogan, M. J., Litos, M. D., Walz, D. R., Muggli, P., An, W., Clayton, C. E., Joshi, C., Lu, W., Marsh, K. A., Mori, W., Vafaei, N., Max Planck Institute for Physics, Munich, and University of California, Los Angeles, CA 90095. Head erosion with emittance growth in PWFA. United States: N. p., 2012. Web. doi:10.1063/1.4773762.
Li, S. Z., Adli, E., England, R. J., Frederico, J., Gessner, S. J., Hogan, M. J., Litos, M. D., Walz, D. R., Muggli, P., An, W., Clayton, C. E., Joshi, C., Lu, W., Marsh, K. A., Mori, W., Vafaei, N., Max Planck Institute for Physics, Munich, & University of California, Los Angeles, CA 90095. Head erosion with emittance growth in PWFA. United States. doi:10.1063/1.4773762.
Li, S. Z., Adli, E., England, R. J., Frederico, J., Gessner, S. J., Hogan, M. J., Litos, M. D., Walz, D. R., Muggli, P., An, W., Clayton, C. E., Joshi, C., Lu, W., Marsh, K. A., Mori, W., Vafaei, N., Max Planck Institute for Physics, Munich, and University of California, Los Angeles, CA 90095. 2012. "Head erosion with emittance growth in PWFA". United States. doi:10.1063/1.4773762.
@article{osti_22075891,
title = {Head erosion with emittance growth in PWFA},
author = {Li, S. Z. and Adli, E. and England, R. J. and Frederico, J. and Gessner, S. J. and Hogan, M. J. and Litos, M. D. and Walz, D. R. and Muggli, P. and An, W. and Clayton, C. E. and Joshi, C. and Lu, W. and Marsh, K. A. and Mori, W. and Vafaei, N. and Max Planck Institute for Physics, Munich and University of California, Los Angeles, CA 90095},
abstractNote = {Head erosion is one of the limiting factors in plasma wakefield acceleration (PWFA). We present a study of head erosion with emittance growth in field-ionized plasma from the PWFA experiments performed at the FACET user facility at SLAC. At FACET, a 20.3 GeV bunch with 1.8 Multiplication-Sign 10{sup 10} electrons is optimized in beam transverse size and combined with a high density lithium plasma for beam-driven plasma wakefield acceleration experiments. A target foil is inserted upstream of the plasma source to increase the bunch emittance through multiple scattering. Its effect on beamplasma interaction is observed with an energy spectrometer after a vertical bend magnet. Results from the first experiments show that increasing the emittance has suppressed vapor field-ionization and plasma wakefields excitation. Plans for the future are presented.},
doi = {10.1063/1.4773762},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1507,
place = {United States},
year = 2012,
month =
}
  • Simulations have identified charge-density variations as driving the dominant emittance growth mechanism for high-current, low-emittance induction linacs using solenoidal focusing, once the beam enters the emittance-dominated regime. In this paper, we use the radial equation of motion, including the nonlinearities resulting from radial density variations, to understand this effect. Nonlinearities in the beam{close_quote}s radial motion while in a solenoid arise from the noncancellation of the effects from the diamagnetic axial magnetic field and the potential depression of the beam, if the beam density is nonuniform. Any initial density variation drives a logarithmic increase in additional higher-order density variations (through themore » differential betatron motion), and an emittance growth that scales logarithmically, or greater (even potentially faster than linear), with the axial distance along the accelerator. The growth rate depends on the beam current, the focusing force, and the accelerating gradient, and for typical machine parameters, the growth rate can be faster than linear with distance. The magnitude of the emittance growth depends critically on the matching of the beam from the injector to the beamline. This formalism leads to a criterion of how uniform the beam density has to be and how well the beam needs to be matched in order not to have an unacceptable emittance growth. {copyright} {ital 1998 American Institute of Physics.}« less
  • No abstract prepared.
  • The plasma afterburner has been proposed as a possible advanced acceleration scheme for a future linear collider. In this concept, a high energy electron(or positron) drive beam from an existing linac such as the SLC will propagate in a plasma section of density about one order of magnitude lower than the peak beam density. The particle beam generates a strong plasma wave wakefield which has a phase velocity equal to the velocity of the beam and this wakefield can be used to accelerate part of the drive beam or a trailing beam. Several issues such as the efficient transfer ofmore » energy and the stable propagation of the particle beam in the plasma are critical to the afterburner concept. We investigate the nonlinear beam-plasma interactions in such scenario using a new 3D particle-in-cell code called QuickPIC. Preliminary simulation results for electron acceleration, beam-loading and hosing instability will be presented.« less
  • Weibel instability is of central importance for relativistic beams both in laboratory, ex. fast-igniter concept for inertial confinement fusion, and astrophysical, ex. cosmic jets, plasmas. Simulations, using QuickPIC, of an intense and monoenergetic beam propagating through a plasma were conducted for experimental setups with Laser Wakefield and RF accelerators and show the appearance of Weibel instability (or current instability). The appearance of the instability is investigated as a function of beam parameters (density, spot size and bunch length) and plasma parameters (plasma density and length of plasma). We present preliminary simulation results that show that the instability should be observablemore » for the RF accelerator experiment.« less