Focusing and stabilizing laser–plasma-generated electron beams with magnetic devices

Focusing and stabilizing laser–plasma-generated electron beams with magnetic devices
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Yuji Oishi, Danilo Giulietti, Federica Baffigi, Lorenzo Fulgentini, Antonio Giulietti, Petra Köster, Luca Labate, Masaki Kando, and Leonida A. Gizzi

Japanese Journal of Applied Physics, Vol. 53, 092702, (2014)

Abstract

External magnetic devices have been successfully tested to control the divergence and pointing stability of subrelativistic electron beams accelerated by ultrashort laser pulses in a nitrogen plasma (electron density of similar to 10(19) cm(-3)). Different configurations of the magnetic devices have been studied, and their effects ate discussed in detail. The analysis is also supported by the results of ray-tracing simulations using the first-order trajectory equation in the magnetic field configurations. This simple method of improving beam stability will be particularly useful for applying laser-generated ultrashort electron beams to high-dose radiobiological studies.

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