Emittance measurement along transport beam line for laser driven protons

Open Access

Emittance measurement along transport beam line for laser driven protons

M. J. Wu, D. Y. Li, J. G. Zhu, T. Yang, X. Y. Hu, Y. X. Geng, K. Zhu, M. J. Easton, Y. Y. Zhao, A. L. Zhang, H. Y. Lu, W. J. Ma, C. Lin, and X. Q. Yan

Phys. Rev. Accel. Beams 23, 031302 – Published 11 March 2020

Abstract

Particle emittance quantifies the ability to focus and transport a beam, and is one of the most important parameters for a beamline. The emittance of a proton beam produced by ultraintense laser irradiation of a micron-thick flat solid target has been measured systematically for the first time, using three different methods at different positions along the transport beamline: pepper-pot method, quadrupole triplet scan technique, and single-shot emittance measurement. Emittance growth is shown both in experiments and in simulations using CST. An over 3-fold emittance growth was found for 5 MeV laser-driven protons with an energy spread of $\pm 2 %$ and divergence of $\pm 20 mrad$ after being transported 5.9 m in the experiment, due to the energy spread and angular dispersion of the protons.

Received 9 January 2020
Accepted 2 March 2020

DOI:https://doi.org/10.1103/PhysRevAccelBeams.23.031302

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Laser driven ion acceleration

Accelerators & Beams

Authors & Affiliations

M. J. Wu ¹, D. Y. Li¹, J. G. Zhu¹, T. Yang ¹, X. Y. Hu¹, Y. X. Geng¹, K. Zhu¹, M. J. Easton ¹, Y. Y. Zhao¹, A. L. Zhang¹, H. Y. Lu¹, W. J. Ma¹, C. Lin^1,2,*, and X. Q. Yan^1,2,†

¹State Key Laboratory of Nuclear Physics and Technology, and Key Laboratory of HEDP of the Ministry of Education, CAPT, Peking University, Beijing 100871, China
²Collaborative Innovation Center of Extreme Optics, Shanxi University, Shanxi 030006, China

^*lc0812@pku.edu.cn
^†xueqingyan@pku.edu.cn

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Issue

Vol. 23, Iss. 3 — March 2020

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