Compression and acceleration of dense electron bunches by ultraintense laser pulses with sharp rising edgeстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:In this paper, the generation of a single ultrashort and coherent relativistic electron bunch
(relativistic electron mirror) during interaction of an ultraintense femtosecond laser pulse having a
sharp enough rising edge (nonadiabatic laser pulse) with a thin plasma layer is considered. It is
shown that due to the action of the radiation reaction forces the Coulomb repulsion among the bunch
electrons is partially compensated and the initial geometry of the bunch is supported in the
acceleration process. Besides, the bunch can be compressed by many times in the longitudinal
direction at the initial stage of interaction with the front of the nonadiabatic laser pulse. As a result,
all of the bunch electrons can be synchronously accelerated to ultrarelativistic velocities during the
first several half periods of the external electromagnetic field that can correspond to time intervals
of hundreds of femtoseconds in the laboratory frame. The characteristics of the accelerated electron
bunches for different laser-plasma parameters (shape of laser pulse, initial density of electrons in the
target, and initial target thickness) are investigated. One possible application for relativistic electron
mirrors is considered. It is shown that the reflection of a probe counter-propagating laser pulse from
such a mirror can produce intense, ultrashort, and coherent hard x-ray pulse. The spectrum of the
frequency up-shifted radiation is investigated.