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The role of collisions on mode competition between the two-stream and Weibel instabilities*

Published online by Cambridge University Press:  08 January 2014

K. A. HUMPHREY,
R. M. G. M. TRINES,
D. C. SPEIRS,
P. NORREYS and
R. BINGHAM
K. A. HUMPHREY
Affiliation:
SUPA, Department of Physics, University of Strathclyde, Glasgow, G4 0NG, UK (bob.bingham@stfc.ac.uk)
R. M. G. M. TRINES
Affiliation:
STFC Rutherford Appleton Laboratory, Harwell Oxford, Didcot, Oxfordshire, OX11 0QX, UK
D. C. SPEIRS
Affiliation:
SUPA, Department of Physics, University of Strathclyde, Glasgow, G4 0NG, UK (bob.bingham@stfc.ac.uk)
P. NORREYS
Affiliation:
STFC Rutherford Appleton Laboratory, Harwell Oxford, Didcot, Oxfordshire, OX11 0QX, UK
R. BINGHAM
Affiliation:
SUPA, Department of Physics, University of Strathclyde, Glasgow, G4 0NG, UK (bob.bingham@stfc.ac.uk)STFC Rutherford Appleton Laboratory, Harwell Oxford, Didcot, Oxfordshire, OX11 0QX, UK
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Abstract

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We present results from numerical simulations conducted to investigate a potential method for realizing the required fusion fuel heating in the fast ignition scheme to achieving inertial confinement fusion. A comparison will be made between collisionless and collisional particle-in-cell simulations of the relaxation of a non-thermal electron beam through the two-stream instability. The results presented demonstrate energy transfer to the plasma ion population from the laser-driven electron beam via the nonlinear wave–wave interaction associated with the two-stream instability. Evidence will also be provided for the effects of preferential damping of competing instabilities such as the Weibel mode found to be detrimental to the ion heating process.

Footnotes

*

This paper is dedicated to the memory of Padma Shukla a dear friend and collaborator.

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