Characterization of transverse beam emittance of electrons from a laser-plasma wakefield accelerator in the bubble regime using betatron x-ray radiation

• Autor(a) principal: Kneip, S.
• Data de Publicação: 2012
• Outros Autores: McGuffey, C., Martins, J. L., Bloom, M. S., Chvykov, V. V., Dollar, F. J., Fonseca, R. A., Jolly, S. W., Kalintchenko, G. A., Krushelnick, K., Maksimchuk, A. M., Mangles, S. P. D., Najmudin, Z., Palmer, C. A. J., Ta Phuoc, K., Schumaker, W., Silva, L. O., Vieira, J., Yanovsky, V. P., Thomas, A. G. R.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: https://ciencia.iscte-iul.pt/public/pub/id/11210; http://hdl.handle.net/10071/9979

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 regime.