Transverse phase space diagnostics for ionization injection in laser plasma acceleration using permanent magnetic quadrupoles

Li, F.; Nie, Z.; Wu, Y. P.; Guo, B.; Zhang, X. H.; Huang, S.; Zhang, J.; Cheng, Z.; Ma, Y.; Fang, Y.; Zhang, C. J.; Wan, Y.; Xu, X. L.; Hua, J. F.; Pai, C. H.; Lu, W.; Mori, W. B.

doi:10.1088/1361-6587/aaacc2

Title: Transverse phase space diagnostics for ionization injection in laser plasma acceleration using permanent magnetic quadrupoles

Journal Article · 22 February 2018 · Plasma Physics and Controlled Fusion

DOI: https://doi.org/10.1088/1361-6587/aaacc2 · OSTI ID:1436412

^[1]; Nie, Z. ^[1]; Wu, Y. P. ^[1]; Guo, B. ^[1]; Zhang, X. H. ^[1]; Huang, S. ^[1]; Zhang, J. ^[1]; Cheng, Z. ^[1]; Ma, Y. ^[1]; Fang, Y. ^[1];

^[2];

^[1]; Xu, X. L. ^[3]; Hua, J. F. ^[1]; Pai, C. H. ^[1]; Lu, W. ^[1]; Mori, W. B. ^[2]

Tsinghua Univ., Beijing (China). Dept. of Engineering Physics
Univ. of California, Los Angeles, CA (United States)
Univ. of California, Los Angeles, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)

We report the transverse phase space diagnostics for electron beams generated through ionization injection in a laser-plasma accelerator. Single-shot measurements of both ultimate emittance and Twiss parameters are achieved by means of permanent magnetic quadrupole. Beams with emittance of μm rad level are obtained in a typical ionization injection scheme, and the dependence on nitrogen concentration and charge density is studied experimentally and confirmed by simulations. A key feature of the transverse phase space, matched beams with Twiss parameter α_T ≃ 0, is identified according to the measurement. Lastly, numerical simulations that are in qualitative agreement with the experimental results reveal that a sufficient phase mixing induced by an overlong injection length leads to the matched phase space distribution.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE; National Natural Science Foundation of China (NSFC)

Grant/Contract Number:: AC02-76SF00515; 11375006; 11425521; 11475101; 11535006; 11775125

OSTI ID:: 1436412

Journal Information:: Plasma Physics and Controlled Fusion, Vol. 60, Issue 4; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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