Author: Pacey, T.H.
Paper Title Page
TUPMY025 Proton-Driven Electron Acceleration in Hollow Plasma 1601
 
  • Y. M. Li, K. Hanahoe, O. Mete Apsimon, T.H. Pacey, G.X. Xia
    UMAN, Manchester, United Kingdom
  
  Funding: President's Doctoral Scholar Award from The University of Manchester.
Proton driven plasma wakefield acceleration has been proposed to accelerate electrons to TeV-scale in a single hundreds of meters plasma section. However, it is difficult to conserve beam quality due to the positively charged driven scheme. In this paper, we demonstrate via simulation that hollow plasma is favourable to maintain the long and stable acceleration and simultaneously be able to achieve low normalized emittance and energy spread of the witness electrons. Moreover, it has much higher beam loading tolerance compared to the uniform case. This will potentially facilitates the acceleration of a large number of particles with high beam quality.
* Caldwell A et al.Nature Physics, 2009, 5(5): 363-367
** K. Lotov, Phys. Rev. ST Accel. Beams, 2010, 13(4): 041301.
*** W. Kimura et al., Phys. Rev. ST Accel. Beams, 2011, 14(4): 041301.
 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMY025  
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WEPMY026 A Gas-filled Capillary Based Plasma Source for Wakefield Experiments 2613
 
  • O. Mete Apsimon, K. Hanahoe, T.H. Pacey, G.X. Xia
    UMAN, Manchester, United Kingdom
  
  Funding: This work is supported by the University of Manchester Strategic Grant.
A plasma medium can be formed when a gas is discharged via an applied high voltage within a capillary tube. A high voltage discharge based plasma source for plasma wake- field acceleration experiment is being developed. Design considered a glass capillary tube with various inner radii. Glass was preferred to sapphire or quartz options to ease the machining. Electrodes will be attached to the tube using a sealant resistant to high vacuum conditions and baking at high temperatures. Each electrode will be isolated from the neighbouring one using nuts or washers from a thermoplastic polymer insulator material to prevent unwanted sparking outside of the tube. In this paper, general design considerations and possible working points of this plasma source are presented for a range of plasma densities from 1×1020 to 1×1022 m−3. Consideration was also given to plasma density diagnostic techniques due to critical dependence of accelerating gradient on plasma density. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMY026  
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WEPMY027 Feasibility Study of Plasma Wakefield Acceleration at the CLARA Front End Facility 2617
 
  • K. Hanahoe, R.B. Appleby, Y. M. Li, T.H. Pacey, G.X. Xia
    UMAN, Manchester, United Kingdom
  • B. Hidding
    USTRAT/SUPA, Glasgow, United Kingdom
  • B. Kyle
    University of Manchester, Manchester, United Kingdom
  • O. Mete Apsimon
    Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
  • J.D.A. Smith
    Tech-X, Boulder, Colorado, USA
  
  Funding: Cockcroft Institute Core Grant and STFC
Plasma wakefield acceleration has been proposed at the CLARA Front End (FE) facility at Daresbury Laboratory. The initial phase of the experiment will acceleration of the tail of a single electron bunch, and the follow-up experiment will study preserving a high quality beam based on a two-bunch acceleration scenario. In this paper, a concept for the initial experiment is outlined and detailed simulation results are presented. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMY027  
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