Polarization of plastic targets by laser ablation

0471561 - FZÚ 2017 RIV GB eng J - Journal Article
Giuffreda, E. - Delle Side, D. - Krása, Josef - Nassisi, V.
Polarization of plastic targets by laser ablation.
Journal of Instrumentation. Roč. 11, May (2016), s. 1-6, č. článku C05004. ISSN 1748-0221. E-ISSN 1748-0221
Institutional support: RVO:68378271
Keywords : lasers * ion sources * wake-field acceleration
Subject RIV: BL - Plasma and Gas Discharge Physics
Impact factor: 1.220, year: 2016

Charge separation in plasmas produced on plastic targets by low laser irradiance, structure of the ion front, and the current of fast electrons expanding into the vacuum chamber ahead of ions are characterized. Of particular interest is the negative current flowing through the plastic targets to the grounded vacuum chamber during the period of laser-target interaction. The subsequent multi peaked structure of positive target current is correlated with occurrence of double sheet layers. The late-time negative charging of targets provides evidence for production of very slow ions by ionization of neutrals ablated at the target crater by radiation from plasma produced by 23 ns excimer KrF laser. The experimental setting allowing the target current observation is discussed.
Permanent Link: http://hdl.handle.net/11104/0268938