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Alfvén limit in fast ignition.

J R Davies1

  • 1GoLP, Instituto Superior Técnico, 1049-001 Lisbon, Portugal. jdavies@popsrv.ist.utl.pt

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|July 13, 2004
PubMed
Summary

Fast ignition fusion requires a laser-generated electron beam that exceeds the Alfvén limit. The return current decays too quickly, but increasing electron beam energy and using multiple beams are viable solutions for fusion energy.

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Laser-driven inertial confinement fusion

Background:

  • Fast ignition is a promising approach for inertial confinement fusion (ICF).
  • It relies on laser-generated electron beams for rapid fuel heating.
  • Electron beam propagation is limited by the Alfvén limit and requires a return current within the plasma.

Purpose of the Study:

  • To investigate the feasibility of the fast ignition scheme.
  • To analyze the resistive decay of the return current in laser-generated electron beams.
  • To identify practical solutions for overcoming propagation limitations.

Main Methods:

  • Analysis of return current decay in plasma.
  • Evaluation of proposed solutions including beam energy, radius, duration, and number.
  • Consideration of laser wavelength constraints.

Main Results:

  • The resistive decay of the return current is too rapid for the original fast ignition scheme.
  • Increasing the mean energy of the electron beam is a potential solution.
  • Reducing beam radius and duration, using multiple beams, or an annular beam were also considered.

Conclusions:

  • The originally proposed fast ignition scheme is not viable due to rapid return current decay.
  • Increasing the mean energy and number of laser-generated electron beams are the most practical solutions.
  • These solutions address the Alfvén limit and plasma return current requirements for successful ICF.

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