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Generation of uniform transverse beam distributions for high-energy electron radiography

Published online by Cambridge University Press:  18 September 2018

Q.T. Zhao ,
S.C. Cao ,
R. Cheng ,
Y.C. Du ,
X.K. Shen ,
Y.R. Wang ,
J.H. Xiao ,
Y. Zong ,
Y.L. Zhu  and
Y.W. Zhou
...Show all authors
Q.T. Zhao*
Affiliation:
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
S.C. Cao
Affiliation:
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
R. Cheng
Affiliation:
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
Y.C. Du
Affiliation:
Department of Engineering Physics, Tsinghua University, Beijing 100084, China
X.K. Shen
Affiliation:
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
Y.R. Wang
Affiliation:
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China University of Chinese Academy of Sciences, Beijing 100049, China
J.H. Xiao
Affiliation:
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China University of Chinese Academy of Sciences, Beijing 100049, China
Y. Zong
Affiliation:
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
Y.L. Zhu
Affiliation:
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China University of Chinese Academy of Sciences, Beijing 100049, China
Y.W. Zhou
Affiliation:
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China University of Chinese Academy of Sciences, Beijing 100049, China
Y.T. Zhao
Affiliation:
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China Xi'an Jiaotong University, Xi'an 710049, China
Z.M. Zhang*
Affiliation:
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
W. Gai
Affiliation:
Department of Engineering Physics, Tsinghua University, Beijing 100084, China Argonne National Laboratory, Argonne, IL 60439, USA
*
Author for correspondence: Q.T. Zhao and Z.M. Zhang, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China E-mail: [email protected], [email protected]
Author for correspondence: Q.T. Zhao and Z.M. Zhang, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China E-mail: [email protected], [email protected]
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Abstract

High-energy electron radiography (HEER) has been proposed for time-resolved imaging of materials, high-energy density matter, and for inertial confinement fusion. The areal-density resolution, determined by the image intensity information is critical for these types of diagnostics. Preliminary experimental studies for different materials with the same thickness and the same areal-density target have been imaged and analyzed. Although there are some discrepancies between experimental and theory analysis, the results show that the density distribution can indeed be attained from HEER. The reason for the discrepancies has been investigated and indicates the importance of the uniformity in the transverse distribution beam illuminating the target. Furthermore, the method for generating a uniform transverse distribution beam using octupole magnets was studied and verified by simulations. The simulations also confirm that the octupole field does not affect the angle-position correlation in the center part beam, a critical requirement for the imaging lens. A more practical method for HEER using collimators and octupoles for generating more uniform beams is also described. Detailed experimental results and simulation studies are presented in this paper.

Keywords

Areal densityhigh-energy electron radiographyimage intensitytransverse uniform distribution
Type
Research Article
Information
Laser and Particle Beams , Volume 36 , Issue 3 , September 2018 , pp. 313 - 322
Copyright
Copyright © Cambridge University Press 2018 

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