Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 12, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3371709
Keywords
electron accelerators; electron beams; electron sources; laser beam applications; wakefield accelerators
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Hundred-mega-electron-volt electron beams with quasi-monoenergetic distribution, and a transverse geometrical emittance as small as similar to 0.02 pi mm mrad are generated by low power (7 TW, 45 fs) laser pulses tightly focused in helium gas jets in an external static magnetic field, B similar to 1 T. Generation of monoenergetic beams strongly correlates with appearance of a straight, at least 2 mm length plasma channel in a short time before the main laser pulse and with the energy of copropagating picosecond pedestal pulses (PPP). For a moderate energy PPP, the multiple or staged electron self-injection in the channel gives several narrow peaks in the electron energy distribution.
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