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

Abstract

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.

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]; ORCiD logo [2]; ORCiD logo [1];  [3];  [1];  [1];  [1];  [2]
  1. Tsinghua Univ., Beijing (China). Dept. of Engineering Physics
  2. Univ. of California, Los Angeles, CA (United States)
  3. Univ. of California, Los Angeles, CA (United States); 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; National Natural Science Foundation of China (NNSFC)
OSTI Identifier:
1436412
Grant/Contract Number:  
AC02-76SF00515; 11375006; 11425521; 11475101; 11535006; 11775125
Resource Type:
Accepted Manuscript
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Volume: 60; Journal Issue: 4; Journal ID: ISSN 0741-3335
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; emittance; phase space; Twiss parameter; permanent magnetic quadrupole; laser plasma accelerator

Citation Formats

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., and Mori, W. B. Transverse phase space diagnostics for ionization injection in laser plasma acceleration using permanent magnetic quadrupoles. United States: N. p., 2018. Web. doi:10.1088/1361-6587/aaacc2.
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. Transverse phase space diagnostics for ionization injection in laser plasma acceleration using permanent magnetic quadrupoles. United States. doi:10.1088/1361-6587/aaacc2.
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., and Mori, W. B. Thu . "Transverse phase space diagnostics for ionization injection in laser plasma acceleration using permanent magnetic quadrupoles". United States. doi:10.1088/1361-6587/aaacc2. https://www.osti.gov/servlets/purl/1436412.
@article{osti_1436412,
title = {Transverse phase space diagnostics for ionization injection in laser plasma acceleration using permanent magnetic quadrupoles},
author = {Li, F. and Nie, Z. and Wu, Y. P. and Guo, B. and Zhang, X. H. and Huang, S. and Zhang, J. and Cheng, Z. and Ma, Y. and Fang, Y. and Zhang, C. J. and Wan, Y. and Xu, X. L. and Hua, J. F. and Pai, C. H. and Lu, W. and Mori, W. B.},
abstractNote = {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 αT ≃ 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.},
doi = {10.1088/1361-6587/aaacc2},
journal = {Plasma Physics and Controlled Fusion},
number = 4,
volume = 60,
place = {United States},
year = {2018},
month = {2}
}

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Figures / Tables:

Figure 1 Figure 1: Schematic of the experimental setup. The laser pulse is focused by an off-axis parabola into a helium gas jet mixed with nitrogen. The out-coming electron beams are transported and focused by the PMQ doublet. After passing through the dipole magnet, the energy-resolved beams are collected by the detectionmore » screen.« less

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