Abstract
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 , the measured spectrum , and the transverse electron bunch size in the bubble . 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 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 regime.
- Received 30 March 2011
DOI:https://doi.org/10.1103/PhysRevSTAB.15.021302
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Published by the American Physical Society