FIREX project and effects of self-generated electric and magnetic fields on electron-driven fast ignition.

Mima, Kunioki and Sunahara, A. and Shiraga, Hiroyuki and Nishimura, H. and Azechi, H. and Nakamura, T. and Johzaki, T. and Nagatomo, H. and García Fernández, Carlos and Velarde Mayol, Pedro (2010). FIREX project and effects of self-generated electric and magnetic fields on electron-driven fast ignition.. "Plasma Physics and Controlled Fusion", v. 52 (n. 12); pp. 1-6. ISSN 0741-3335. https://doi.org/10.1088/0741-3335/52/12/12404.

Description

Title: FIREX project and effects of self-generated electric and magnetic fields on electron-driven fast ignition.
Author/s:
  • Mima, Kunioki
  • Sunahara, A.
  • Shiraga, Hiroyuki
  • Nishimura, H.
  • Azechi, H.
  • Nakamura, T.
  • Johzaki, T.
  • Nagatomo, H.
  • García Fernández, Carlos
  • Velarde Mayol, Pedro
Item Type: Article
Título de Revista/Publicación: Plasma Physics and Controlled Fusion
Date: January 2010
ISSN: 0741-3335
Volume: 52
Subjects:
Faculty: E.T.S.I. Industriales (UPM)
Department: Ingeniería Nuclear [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Fast ignition is a new scheme in laser fusion, in which higher energy gain with a smaller laser pulse energy is expected. A cone target has been introduced for realizing higher coupling efficiency. At ILE, Osaka University, a laser with four beams and a total output of 10 kJ ps−1, laser for fast ignition experiment (LFEX), has been constructed and we have carried out an integrated experiment with one beam of the LFEX. Through experiments it was found that the coupling efficiency is degraded when the laser pre-pulse is not sufficiently small. Namely, the main pulse is absorbed in the long-scale pre-plasma produced by the pre-pulse and the hot electron energy is higher than that for a clean pulse. Furthermore, the distance between the hot electron source and the core plasma is large. Hence, we are exploring how to overcome the pre-pulse effects on the cone target. In this paper it is proposed that a thin foil covers the laser entrance of the cone to mitigate the pre-plasma and a double cone reduces the loss of high-energy electrons from the side wall of the cone. The simulations indicate that a higher coupling efficiency is expected for the double cone target with a thin foil at the laser entrance. Namely, the pre-pulse will be absorbed by the foil and the electromagnetic fields generated on the surface of the inner cone will confine high-energy electrons.

More information

Item ID: 6723
DC Identifier: http://oa.upm.es/6723/
OAI Identifier: oai:oa.upm.es:6723
DOI: 10.1088/0741-3335/52/12/12404
Official URL: http://iopscience.iop.org/0741-3335/52/12/124047/
Deposited by: Memoria Investigacion
Deposited on: 27 Apr 2011 08:44
Last Modified: 20 Apr 2016 15:54
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