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Title: Method for the calculation of electrical field in laser-generated plasma for ion stream production

Abstract

Ion streams are produced by hot plasmas laser generated at INFN-LNS of Catania by using a 9 ns Nd:YAG laser which irradiates heavy element targets (Ta and Au) placed in vacuum. The ion emission from the plasma was measured with an electrostatic ion energy analyzer either for the energy-to-charge ratio or for the ion energy distributions. The ion emission occurs mainly along the normal to the target surface; the ion stream has a maximum charge state of 10{sup +}; the ions' kinetic energy ranges from hundreds of eV up to values of about 6 keV. In order to evaluate the production and acceleration processes a theoretical framework was defined and cross-checked with experimental results. The ion energy distributions can be fitted with Boltzmann-Coulomb-shifted functions giving the ion plasma temperature, the thermal velocity, the adiabatic expansion velocity of the plasma, and the Coulomb velocity. The ion energy distribution increased with the charge state (about 600 eV/charge state). This result and the emission normal to the target surface indicate the presence of an electrical field inside the plasma which can be calculated by the method described hereinafter. Assuming that the electrical field acts for a distance comparable with the Debye length, themore » calculated electrical field is of the order of 5 MV/cm, in good agreement with the literature data. Measurements and calculation will be presented and discussed in detail.« less

Authors:
;  [1]
  1. INFN-Laboratori Nazionali del Sud, 95124 Catania, Italy, and Dipartimento di Fisica, University di Messina, 98166 Messina (Italy)
Publication Date:
OSTI Identifier:
20779080
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 77; Journal Issue: 3; Conference: 11. international conference on ion sources, Caen (France), 12-16 Sep 2005; Other Information: DOI: 10.1063/1.2170033; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CHARGE STATES; DEBYE LENGTH; ELECTRIC FIELDS; ELECTRON TEMPERATURE; ENERGY SPECTRA; GOLD; HOT PLASMA; ION EMISSION; ION TEMPERATURE; IONS; KINETIC ENERGY; LASERS; MINUS-PLUS RATIO; PLASMA DIAGNOSTICS; PLASMA PRODUCTION; SURFACES; TANTALUM; VELOCITY

Citation Formats

Torrisi, L, and Gammino, S. Method for the calculation of electrical field in laser-generated plasma for ion stream production. United States: N. p., 2006. Web. doi:10.1063/1.2170033.
Torrisi, L, & Gammino, S. Method for the calculation of electrical field in laser-generated plasma for ion stream production. United States. https://doi.org/10.1063/1.2170033
Torrisi, L, and Gammino, S. Wed . "Method for the calculation of electrical field in laser-generated plasma for ion stream production". United States. https://doi.org/10.1063/1.2170033.
@article{osti_20779080,
title = {Method for the calculation of electrical field in laser-generated plasma for ion stream production},
author = {Torrisi, L and Gammino, S},
abstractNote = {Ion streams are produced by hot plasmas laser generated at INFN-LNS of Catania by using a 9 ns Nd:YAG laser which irradiates heavy element targets (Ta and Au) placed in vacuum. The ion emission from the plasma was measured with an electrostatic ion energy analyzer either for the energy-to-charge ratio or for the ion energy distributions. The ion emission occurs mainly along the normal to the target surface; the ion stream has a maximum charge state of 10{sup +}; the ions' kinetic energy ranges from hundreds of eV up to values of about 6 keV. In order to evaluate the production and acceleration processes a theoretical framework was defined and cross-checked with experimental results. The ion energy distributions can be fitted with Boltzmann-Coulomb-shifted functions giving the ion plasma temperature, the thermal velocity, the adiabatic expansion velocity of the plasma, and the Coulomb velocity. The ion energy distribution increased with the charge state (about 600 eV/charge state). This result and the emission normal to the target surface indicate the presence of an electrical field inside the plasma which can be calculated by the method described hereinafter. Assuming that the electrical field acts for a distance comparable with the Debye length, the calculated electrical field is of the order of 5 MV/cm, in good agreement with the literature data. Measurements and calculation will be presented and discussed in detail.},
doi = {10.1063/1.2170033},
url = {https://www.osti.gov/biblio/20779080}, journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 3,
volume = 77,
place = {United States},
year = {2006},
month = {3}
}