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Yoon, Eisung
Fusion and Plasma Application Research Laboratory (FPL)
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Witness electron beam injection using an active plasma lens for a proton beam-driven plasma wakefield accelerator

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Title
Witness electron beam injection using an active plasma lens for a proton beam-driven plasma wakefield accelerator
Author
Kim, S.-Y.Moon, K.Chung, MosesSjobak, K. N.Adli, E.Dayyani, M.Doebert, S.Yoon, EisungNam, I.Hahn, G.
Issue Date
2021-12
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW ACCELERATORS AND BEAMS, v.24, no.12, pp.121304
Abstract
An active plasma lens (APL) focuses the beam in both the horizontal and vertical planes simultaneously using a magnetic field generated by a discharge current through the plasma. A beam size of 5-10 mu m can be achieved within a short distance using a focusing gradient on the order of 100 T/m. The APL is therefore an attractive element for plasma wakefield acceleration, because an ultrasmall size of the witness electron beam is required for injection into the plasma wakefield to minimize emittance growth and to enhance the capturing efficiency. When the drive beam and witness electron beam copropagate through the APL, interactions between the drive and witness beams, and the plasma must be considered. In this paper, through particle-in-cell simulations, we discuss the possibility of using an APL for the final focusing of the electron beam for the AWAKE RUN 2 experiments. It is confirmed that the amplitude of the plasma wakefield excited by proton bunches remains the same even after propagation through the APL. The emittance of the witness electron beam increases rapidly in the plasma density ramp regions of the lens. Nevertheless, when the witness electron beam has a charge of 100 pC, emittance of 10 mm mrad, and bunch length of 60 mu m, its emittance growth is not significant along the active plasma lens. For small emittance, such as 2 mm mrad, the emittance growth is found to be strongly dependent on the rms beam size, plasma density, and multiple Coulomb scattering.
URI
https://scholarworks.unist.ac.kr/handle/201301/55120
URL
https://journals.aps.org/prab/abstract/10.1103/PhysRevAccelBeams.24.121304
DOI
10.1103/physrevaccelbeams.24.121304
ISSN
2469-9888
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