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Title: High transformer ratio of multi-channel dielectric wakefield structures

Authors:
; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1325389
Grant/Contract Number:
FG02-06 ER84473; SC000 924; SC000 6226
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 829; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-04 21:52:54; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English

Citation Formats

Shchelkunov, Sergey V., Marshall, Thomas C., Sotnikov, Gennadij V., and Hirshfield, Jay L. High transformer ratio of multi-channel dielectric wakefield structures. Netherlands: N. p., 2016. Web. doi:10.1016/j.nima.2016.03.033.
Shchelkunov, Sergey V., Marshall, Thomas C., Sotnikov, Gennadij V., & Hirshfield, Jay L. High transformer ratio of multi-channel dielectric wakefield structures. Netherlands. doi:10.1016/j.nima.2016.03.033.
Shchelkunov, Sergey V., Marshall, Thomas C., Sotnikov, Gennadij V., and Hirshfield, Jay L. 2016. "High transformer ratio of multi-channel dielectric wakefield structures". Netherlands. doi:10.1016/j.nima.2016.03.033.
@article{osti_1325389,
title = {High transformer ratio of multi-channel dielectric wakefield structures},
author = {Shchelkunov, Sergey V. and Marshall, Thomas C. and Sotnikov, Gennadij V. and Hirshfield, Jay L.},
abstractNote = {},
doi = {10.1016/j.nima.2016.03.033},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = C,
volume = 829,
place = {Netherlands},
year = 2016,
month = 9
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.nima.2016.03.033

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  • Current status of a two-channel cm-scale rectangular dielectric lined wakefield accelerator structure is described. This structure is installed at the Argonne Wakefield Accelerator facility (AWA), and is presently being evaluated. The device has a transformer ratio of {approx}12.5:1. When driven by a {approx}50 nC single drive bunch it is expected to obtain {approx}6 MV/m acceleration gradient. Related issues are discussed.
  • Particle-in-cell simulations of a plasma wakefield accelerator in the linear regime are presented, consisting of four electron bunches that are fed into a high-density plasma. It is found that a high transformer ratio can be maintained over 43 cm of plasma if the charge in each bunch is increased linearly, the bunches are placed 1.5 plasma wavelengths apart and the bunch emmitances are adjusted to compensate for the nonlinear focusing forces. The generated wakefield is sampled by a test witness bunch whose energy gain after the plasma is six times the energy loss of the drive bunches.
  • For wakefield based acceleration schemes, use of an asymmetric (or linearly ramped) drive bunch current profile has been predicted to enhance the transformer ratio and generate large accelerating wakes. We discuss plans and initial results for producing such bunches using the 20 to 23 GeV electron beam at the FACET facility at SLAC National Accelerator Laboratory and sending them through plasmas and dielectric tubes to generate transformer ratios greater than 2 (the limit for symmetric bunches). The scheme proposed utilizes the final FACET chicane compressor and transverse collimation to shape the longitudinal phase space of the beam.
  • A coaxial two-channel dielectric wakefield structure is examined for use as a high gradient accelerator. A THz design, having radius {approx}1 mm, is shown to provide GeV/m--level acceleration gradient, high transformer ratio, and stable accelerated bunch motion when excited by a stable-moving 5-GeV 6-nC annular drive bunch.