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Graduate Student Seminar - 12/10/2010

"Direct Laser Acceleration Using a Modulated Plasma Channel"

by Sungjun Yoon

Friday, December 10, 2010 -- 12:00 p.m.
Large Conference Room, 1207 Energy Research Facility

Advisor:  Professor Howard Milchberg

I will describe an electron acceleration scheme based on direct acceleration by the laser field rather than by plasma waves. The scheme uses radially polarized laser pulses propagating in periodically modulated plasma channels. Conventional linear particle accelerators, where e-bunches are phase-matched to TM RF fields, produce relativistic bunches routinely. These devices are quite long owing to breakdown of the metallic guiding structure by the high power RF, which limits the RF strength and therefore necessitates a longer interaction distance. We solve the field strength and breakdown problems by using intense laser fields in plasmas. The modulated plasma channel allows quasi-phase matching between electron velocity and the phase velocity of the guided laser pulse. We introduce a simple way to generate quasi-radially polarized light for the longitudinal accelerating field.

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