We show that under appropriate conditions the impact of a very short and intense laser pulse onto a plasma causes the expulsion of surface electrons with high energy in the direction opposite to the one of the propagations of the pulse. This is due to the combined effects of the ponderomotive force and the huge longitudinal field arising from charge separation (???slingshot effect???). The effect should also be present with other states of matter, provided the pulse is sufficiently intense to locally cause complete ionization. An experimental test seems to be feasible and, if confirmed, would provide a new extraction and acceleration mechanism for electrons, alternative to traditional radio-frequency-based or laser-wake-field ones.
The slingshot effect: a possible new laser-driven high energy acceleration mechanism for electrons / Fiore, Gaetano; Fedele, Renato; DE ANGELIS, Umberto. - In: PHYSICS OF PLASMAS. - ISSN 1070-664X. - 21:(2014), pp. 113105-1-113105-13. [10.1063/1.4901285]
The slingshot effect: a possible new laser-driven high energy acceleration mechanism for electrons
FIORE, GAETANO;FEDELE, RENATO;DE ANGELIS, UMBERTO
2014
Abstract
We show that under appropriate conditions the impact of a very short and intense laser pulse onto a plasma causes the expulsion of surface electrons with high energy in the direction opposite to the one of the propagations of the pulse. This is due to the combined effects of the ponderomotive force and the huge longitudinal field arising from charge separation (???slingshot effect???). The effect should also be present with other states of matter, provided the pulse is sufficiently intense to locally cause complete ionization. An experimental test seems to be feasible and, if confirmed, would provide a new extraction and acceleration mechanism for electrons, alternative to traditional radio-frequency-based or laser-wake-field ones.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
