期刊
PHYSICAL REVIEW LETTERS
卷 109, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.064802
关键词
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资金
- Office of Science, Office of High Energy Physics, U.S. Dept. of Energy [DE-AC02-05CH11231, DOE NNSA NA-22]
- NSF [PHY-0917687, 0614001]
- Direct For Mathematical & Physical Scien [0917687] Funding Source: National Science Foundation
- Division Of Physics [0917687] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [0935197] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [0614001] Funding Source: National Science Foundation
X-ray spectroscopy is used to obtain single-shot information on electron beam emittance in a low-energy-spread 0.5 GeV-class laser-plasma accelerator. Measurements of betatron radiation from 2 to 20 keV used a CCD and single-photon counting techniques. By matching x-ray spectra to betatron radiation models, the electron bunch radius inside the plasma is estimated to be similar to 0.1 mu m. Combining this with simultaneous electron spectra, normalized transverse emittance is estimated to be as low as 0.1 mm mrad, consistent with three-dimensional particle-in-cell simulations. Correlations of the bunch radius with electron beam parameters are presented.
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