Characterization of transverse beam emittance of electrons from a laser-plasma wakefield accelerator in the bubble regime using betatron x-ray radiation
- Kneip, S.
- McGuffey, C.
- Martins, J. L.
- Bloom, M. S.
- Chvykov, V.
- Dollar, F.
- Fonseca, R.
- Jolly, S.
- Kalintchenko, G.
- Krushelnick, K.
- Maksimchuk, A.
- Mangles, S. P. D.
- Najmudin, Z.
- Palmer, C. A. J.
- Phuoc, K. Ta
- Schumaker, W.
- Silva, L. O.
- Vieira, J.
- Yanovsky, V.
- Thomas, A. G. R.
DOIAbstract
We propose and use a technique to measure the transverse emittance of a laser-wakefield accelerated beam of relativistic electrons. The technique is based on the simultaneous measurements of the electron beam divergence given by v(perpendicular to)/v(parallel to), the measured spectrum gamma, and the transverse electron bunch size in the bubble r(perpendicular to). The latter is obtained via the measurement of the source size of the x rays emitted by the accelerating electron bunch in the bubble. We measure a normalized rms beam transverse emittance <0.5 pi mm mrad as an upper limit for a spatially Gaussian, spectrally quasimonoenergetic electron beam with 230 MeV energy in agreement with numerical modeling and analytic theory in the bubble...
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