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Jan 2004

Volume 11, Issue 1, pp. 1-337

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Discrete Alfvén eigenmodes in high-β toroidal plasmas

S. Hu and Liu Chen

Phys. Plasmas 11, 1 (2004); http://dx.doi.org/10.1063/1.1630966 (4 pages) | Cited 10 times

Online Publication Date: 19 December 2003

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A new type of high-n discrete Alfvén eigenmodes is shown to exist in the large-α (α ≡ −q2Rdβ/dr) second ballooning stable toroidal plasmas. Here, n is the toroidal mode number, q is the safety factor, β is the ratio between plasma and magnetic pressures, and R and r are, respectively, the major and minor radii. These magnetohydrodynamic eigenmodes are bounded by the α-induced potential wells along the magnetic field line and, thus, exist even in absence of the toroidal Alfvén frequency gap. Due to negligible continuum damping via wave energy tunneling, these large-α toroidal Alfvén eigenmodes are quasimarginally stable and, thus, could be readily destabilized by energetic particles. © 2004 American Institute of Physics.
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52.55.-s Magnetic confinement and equilibrium

Laser-induced adiabat shaping by relaxation in inertial fusion implosions

K. Anderson and R. Betti

Phys. Plasmas 11, 5 (2004); http://dx.doi.org/10.1063/1.1632903 (4 pages) | Cited 9 times

Online Publication Date: 19 December 2003

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The theory of laser-induced adiabat shaping is carried out for inertial confinement fusion (ICF) capsules. It is shown that a significant improvement of the stability characteristics of ICF implosions can be achieved by shaping the adiabat inside the imploding shell. The optimized adiabat profile has a maximum on the outer ablation surface to lower Rayleigh–Taylor growth rates, and a minimum on the shell inner surface for high compressibility and high neutron yields. Laser-induced adiabat shaping is produced via relaxation using a weak prepulse followed by laser shut-off and the main laser pulse. © 2004 American Institute of Physics.
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52.57.Fg Implosion symmetry and hydrodynamic instability (Rayleigh-Taylor, Richtmyer-Meshkov, imprint, etc.)
52.57.Bc Target design and fabrication
52.57.-z Laser inertial confinement
52.35.Py Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.)
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