Beam emittance preservation using Gaussian density ramps in a beam-driven plasma wakefield accelerator

Litos, M. D.; Ariniello, R.; Doss, C. E.; Hunt-Stone, K.; Cary, J. R.

doi:10.1098/rsta.2018.0181

Title: Beam emittance preservation using Gaussian density ramps in a beam-driven plasma wakefield accelerator

Journal Article · Mon Jun 24 00:00:00 EDT 2019 · Philosophical Transactions of the Royal Society. A, Mathematical, Physical and Engineering Sciences

DOI:https://doi.org/10.1098/rsta.2018.0181· OSTI ID:1612784

^[1]; Ariniello, R. ^[1]; Doss, C. E. ^[1]; Hunt-Stone, K. ^[1]; Cary, J. R. ^[2]

Univ. of Colorado, Boulder, CO (United States)
Univ. of Colorado, Boulder, CO (United States); Tech-X Corp., Boulder, CO (United States)

A current challenge that is facing the plasma wakefield accelerator (PWFA) community is transverse beam emittance preservation. This can be achieved by balancing the natural divergence of the beam against the strong focusing force provided by the PWFA plasma source in a scheme referred to as beam matching. One method to accomplish beam matching is through the gradual focusing of a beam with a plasma density ramp leading into the bulk plasma. Here, the beam dynamics in a Gaussian plasma density ramp are considered, and an empirical formula is identified that gives the ramp length and beam vacuum waist location needed to achieve near-perfect matching. The method uses only the beam vacuum waist beta function as an input. Numerical studies show that the Gaussian ramp focusing formula is robust for beta function demagnification factors spanning more than an order of magnitude with experimentally favourable tolerances for future PWFA research facilities. This article is part of the Theo Murphy meeting issue ‘Directions in particle beam-driven plasma wakefield acceleration’.

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Research Organization:: Univ. of Colorado, Boulder, CO (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0017906

OSTI ID:: 1612784

Journal Information:: Philosophical Transactions of the Royal Society. A, Mathematical, Physical and Engineering Sciences, Vol. 377, Issue 2151; ISSN 1364-503X

Publisher:: The Royal Society PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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