Asymmetry in electron and ion charge collection in a drifting plasma bunch

Journal Article · Tue May 01 04:00:00 EDT 2007 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.2721946· OSTI ID:20982854

Belloni, F; Lorusso, A; Nassisi, V ^[1]

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1. Laboratory of Applied Electronics, Department of Physics, University of Lecce and INFN-sect. of Lecce, C.P. 193, via Arnesano, 73100 Lecce, Italy and European Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe (Germany)

We report on the different behavior of electron and ion currents recorded by a Faraday cup in a plasma bunch generated via laser ablation. An excimer laser was employed to irradiate a Ge target. The current signals were recorded equipping the Faraday cup collector by a set of diaphragms. We found that the electron time-of-flight spectra were fairly similar to the ion ones, but the collected charge yield for electrons was up to 200 times larger than the corresponding ion yield. We ascribed such a discrepancy to the different cup collection efficiency for ions and electrons forming the plasma which was heavily influenced by the plume geometry, the energy of the particles, as well as the diaphragm size. Our findings would suggest that the overall electron charge 'tended' to be collected, unlike the ion charge which scaled upon the collection solid angle.

• OSTI ID: 20982854
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 9 Vol. 101; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABLATION
CHARGE COLLECTION
DIAPHRAGM
ELECTRONS
EXCIMER LASERS
FARADAY CUPS
GEOMETRY
GERMANIUM
IONS
LIGHT TRANSMISSION
PLASMA
PLASMA DIAGNOSTICS
PLUMES
SIGNALS
TIME-OF-FLIGHT METHOD