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Electron energy boosting in laser-wake-field acceleration with external magnetic field B∼1 T and laser prepulses

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6 Author(s)
Hosokai, T. ; Photon Pioneers Center, Osaka University, 2–1, Yamadaoka, Suita, Osaka 565-0871, Japan and Japan Science and Technology Agency (JST), CREST, 2–1, Yamadaoka, Suita, Osaka 565-0871, Japan ; Zhidkov, Alexei ; Yamazaki, Atsushi ; Mizuta, Yoshio
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Hundred-mega-electron-volt electron beams with quasi-monoenergetic distribution, and a transverse geometrical emittance as small as ∼0.02 π mmmrad are generated by low power (7 TW, 45 fs) laser pulses tightly focused in helium gas jets in an external static magnetic field, B∼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.

Published in:

Applied Physics Letters  (Volume:96 ,  Issue: 12 )

Date of Publication:

Mar 2010

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