A method of determining narrow energy spread electron beams from a laser plasma wakefield accelerator using undulator radiation

作者：Gallacher J G^*; Anania M P; Brunetti E; Budde F; Debus A; Ersfeld B; Haupt K; Islam M R; Jaeckel O; Pfotenhauer S; Reitsma A J W; Rohwer E; Schlenvoigt H P; Schwoerer H; Shanks R P; Wiggins S M; Jaroszynski D A

来源：Physics of Plasmas, 2009, 16(9): 093102.

DOI：10.1063/1.3216549

In this paper a new method of determining the energy spread of a relativistic electron beam from a laser-driven plasma wakefield accelerator by measuring radiation from an undulator is presented. This could be used to determine the beam characteristics of multi-GeV accelerators where conventional spectrometers are very large and cumbersome. Simultaneous measurement of the energy spectra of electrons from the wakefield accelerator in the 55-70 MeV range and the radiation spectra in the wavelength range of 700-900 nm of synchrotron radiation emitted from a 50 period undulator confirm a narrow energy spread for electrons accelerated over the dephasing distance where beam loading leads to energy compression. Measured energy spreads of less than 1% indicates the potential of using a wakefield accelerator as a driver of future compact and brilliant ultrashort pulse synchrotron sources and free-electron lasers that require high peak brightness beams.

• 出版日期2009-9