1. Low-emittance electron bunches from a laser-plasma accelerator measured using single-shot X-ray spectroscopy
- Author
-
Carl Schroeder, Kei Nakamura, E. Esarey, J. van Tilborg, Thomas Sokollik, Cs. Toth, Min Chen, Guillaume Plateau, Wim Leemans, S. Shiraishi, Th. Stöhlker, Marco Battaglia, Nicholas H. Matlis, Sergey Rykovanov, T.S. Kim, Carlo Benedetti, Daniel Thorn, Sergiy Trotsenko, Anthony Gonsalves, and C. G. R. Geddes
- Subjects
Physics ,X-ray spectroscopy ,law ,Cathode ray ,Physics::Accelerator Physics ,Thermal emittance ,Plasma ,Electron ,Radius ,Atomic physics ,Laser ,Betatron ,law.invention - Abstract
The presence of low emittance beams in laser-plasma accelerators is indicated by single-shot spectroscopic measurements of betatron X-rays. By matching the X-ray betatron spectra to analytical and numerical models of betatron radiation, the electron bunch radius inside the plasma is estimated to be close to 0.1 micron. Correlations of the bunch radius with electron beam parameters are presented. Photon-counting spectra and statistical fitting are used to establish confidence ranges. Combined with simultaneous electron spectrum and divergence measurements, the normalized transverse emittance is estimated to be as low as 0.1 mm mrad consistent with three-dimensional particle-in-cell simulations.
- Published
- 2013