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

Journal Article · · Plasma Physics and Controlled Fusion
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)
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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.

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
Citation Metrics:
Cited by: 4 works
Citation information provided by
Web of Science

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Figures / Tables (9)

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
emittance
phase space
Twiss parameter
permanent magnetic quadrupole
laser plasma accelerator