A study of electron beams extracted from a plasma produced by laser interaction with a solid target |
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| Authors: | L Marra A Lorusso V Nassisi L Martina |
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| Institution: | 1. Laboratory of Applied Electronics, Department of Physics of Lecce , C.P. 193, via Arnesano, 73100, Lecce, Italy;2. Laboratory of Applied Electronics, Department of Physics of Lecce , C.P. 193, via Arnesano, 73100, Lecce, Italy;3. INFN Sect. of Lecce , C.P. 123, via Arnesano, 73100, Lecce, Italy;4. Department of Physics , University of Lecce , C.P. 193, via Arnesano, 73100, Lecce, Italy |
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| Abstract: | In this work, wave formation in laser-produced plasma is investigated by an analysis of time-of-flight signal of the electron pulse. Electrons are extracted from a non-equilibrium plasma, generated by pulsed laser ablation on a solid Ge target. The process is represented by ion-acoustic waves, which are generated from an external perturbation, given by the positive bias voltage of a Faraday cup. The characteristics of the waves depend substantially on the geometry of the plasma expansion chamber and on laser fluence, but are independent on bias potential. A KrF excimer UV laser was employed for plasma generation. Measurements were performed at two different laser fluences, 4 and 7 J/cm2. The plasma created propagates with a mean velocity of about 1.1?×?104 m/s. A movable Faraday cup was employed in order to collect electrons at different bias voltage values. |
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| Keywords: | Electron beam Extractor Laser ablation UV laser |
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