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Title: Ion Motion Induced Emittance Growth of Matched Electron Beams in Plasma Wakefields

Abstract

Plasma-based acceleration is being considered as the basis for building a future linear collider. Nonlinear plasma wakefields have ideal properties for accelerating and focusing electron beams. Preservation of the emittance of nano-Coulomb beams with nanometer scale matched spot sizes in these wakefields remains a critical issue due to ion motion caused by their large space charge forces. We use fully resolved quasistatic particle-in-cell simulations of electron beams in hydrogen and lithium plasmas, including when the accelerated beam has different emittances in the two transverse planes. The projected emittance initially grows and rapidly saturates with a maximum emittance growth of less than 80% in hydrogen and 20% in lithium. The use of overfocused beams is found to dramatically reduce the emittance growth. In conclusion, the underlying physics that leads to the lower than expected emittance growth is elucidated.

Authors:
 [1];  [2];  [3];  [1];  [4];  [1];  [1]
  1. Univ. of California, Los Angeles, CA (United States)
  2. Tsinghua Univ., Beijing (China); Shanghai Jiao Tong Univ., Shanghai (China)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1369393
Alternate Identifier(s):
OSTI ID: 1363983
Grant/Contract Number:  
AC02-76SF00515; SC0010064; SC0014260; SC0008316; ACI-1339893; PHY-1500630; ACI-1614949; 11425521; 11535006
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 118; Journal Issue: 24; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

An, Weiming, Lu, Wei, Huang, Chengkun, Xu, Xinlu, Hogan, Mark J., Joshi, Chan, and Mori, Warren B. Ion Motion Induced Emittance Growth of Matched Electron Beams in Plasma Wakefields. United States: N. p., 2017. Web. doi:10.1103/PhysRevLett.118.244801.
An, Weiming, Lu, Wei, Huang, Chengkun, Xu, Xinlu, Hogan, Mark J., Joshi, Chan, & Mori, Warren B. Ion Motion Induced Emittance Growth of Matched Electron Beams in Plasma Wakefields. United States. doi:10.1103/PhysRevLett.118.244801.
An, Weiming, Lu, Wei, Huang, Chengkun, Xu, Xinlu, Hogan, Mark J., Joshi, Chan, and Mori, Warren B. Wed . "Ion Motion Induced Emittance Growth of Matched Electron Beams in Plasma Wakefields". United States. doi:10.1103/PhysRevLett.118.244801. https://www.osti.gov/servlets/purl/1369393.
@article{osti_1369393,
title = {Ion Motion Induced Emittance Growth of Matched Electron Beams in Plasma Wakefields},
author = {An, Weiming and Lu, Wei and Huang, Chengkun and Xu, Xinlu and Hogan, Mark J. and Joshi, Chan and Mori, Warren B.},
abstractNote = {Plasma-based acceleration is being considered as the basis for building a future linear collider. Nonlinear plasma wakefields have ideal properties for accelerating and focusing electron beams. Preservation of the emittance of nano-Coulomb beams with nanometer scale matched spot sizes in these wakefields remains a critical issue due to ion motion caused by their large space charge forces. We use fully resolved quasistatic particle-in-cell simulations of electron beams in hydrogen and lithium plasmas, including when the accelerated beam has different emittances in the two transverse planes. The projected emittance initially grows and rapidly saturates with a maximum emittance growth of less than 80% in hydrogen and 20% in lithium. The use of overfocused beams is found to dramatically reduce the emittance growth. In conclusion, the underlying physics that leads to the lower than expected emittance growth is elucidated.},
doi = {10.1103/PhysRevLett.118.244801},
journal = {Physical Review Letters},
number = 24,
volume = 118,
place = {United States},
year = {2017},
month = {6}
}

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