Phase-space dynamics of ionization injection in plasma-based accelerators.
The evolution of beam phase space in ionization injection into plasma wakefields is studied using theory and particle-in-cell simulations. The injection process involves both longitudinal and transverse phase mixing, leading initially to a rapid emittance growth followed by oscillation, decay, and a slow growth to saturation. An analytic theory for this evolution is presented and verified through particle-in-cell simulations. This theory includes the effects of injection distance (time), acceleration distance, wakefield structure, and nonlinear space charge forces, and it also shows how ultralow emittance beams can be produced using ionization injection methods.
Department of Engineering Physics, Tsinghua University, Beijing 100084, China.
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Xu
Department of Engineering Physics, Tsinghua University, Beijing 100084, China.
J F
JF
Hua
Department of Engineering Physics, Tsinghua University, Beijing 100084, China.
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Li
Department of Engineering Physics, Tsinghua University, Beijing 100084, China.
C J
CJ
Zhang
Department of Engineering Physics, Tsinghua University, Beijing 100084, China.
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LX
Yan
Department of Engineering Physics, Tsinghua University, Beijing 100084, China.
Y C
YC
Du
Department of Engineering Physics, Tsinghua University, Beijing 100084, China.
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Huang
Department of Engineering Physics, Tsinghua University, Beijing 100084, China.
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Chen
Department of Engineering Physics, Tsinghua University, Beijing 100084, China.
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Tang
Department of Engineering Physics, Tsinghua University, Beijing 100084, China and University of California Los Angeles, Los Angeles, California 90095, USA.
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Lu
University of California Los Angeles, Los Angeles, California 90095, USA.
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Yu
University of California Los Angeles, Los Angeles, California 90095, USA.
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An
University of California Los Angeles, Los Angeles, California 90095, USA.
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Joshi
University of California Los Angeles, Los Angeles, California 90095, USA.
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Mori