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Experiments have been performed on the Extrap T1 reversed‐field pinch Phys. Scr. 44 , 358 (1991) where the detailed radial structure of the mean profiles, together with associated edge field fluctuation spectra, have been studied at different values of the pinch parameter 1.6≤Θ≤2.5. It is...
Ya. I. Kolesnichenko and his cowerkers observed that the alpha particle energy losses due to Alfvén wave excitation in an ignited plasma did not exceed 25% of the total alpha particle energy. (AIP)
A system of equations is introduced and discussed that describe the nonlinear dynamics of magnetic perturbations in a magnetized, high‐temperature plasma. Diamagnetism, ion gyroradii effects, and finite electron mass are taken into account. These equations govern Alfvén as well as...
The extension of the theory of relaxed plasmas to external magnetic fields whose field lines intersect the wall is concisely formulated and then applied to the Extrap experiment J. R. Drake, Plasma Phys. Controlled Fusion 26 , 387 (1984). It is found that the external octupole field, though not...
A plasma channel produced by a short laser pulse is axially nonuniform due to self‐defocusing of the laser. When a delayed second laser pulse propagates through the channel, diffraction and refraction effects do not balance each other exactly, resulting in periodic beam radius variation with...
Motivated by recent interests in the current‐driven instability as a plausible trigger mechanism for current disruption in the magnetotail, an extensive linear analysis of the lower‐hybrid‐drift instability (LHDI) in a high plasma beta regime is conducted. In the theoretical formulation,...
Indirect‐drive inertial confinement fusion with laser beams requires focusing the beams through laser entrance holes (LEHs) onto the inside surface of the hi‐ Z case comprising the hohlraum. The problem is how to illuminate the hohlraum so that the x‐ray flux upon the capsule is as highly...
Two‐dimensional structures in a plane perpendicular to the magnetic field, of the low‐frequency turbulence in a toroidal plasma, have been studied. The probability distribution functions for the density and the potential fluctuations are found to deviate from the Gaussian distribution...
The envelope equations for a uniform‐density Kapchinskij–Vladimirskij (KV) beam equilibrium are used to derive a transcendental equation for the phase advance of an intense charged particle beam propagating through a periodic quadrupole focusing lattice, κ q ( s )=κ q ( s + S ). The...
The Hamiltonian formalism is used to address the problem of the direct resonant interaction between the fast magnetosonic wave and the electrons in a tokamak plasma. The intrinsic stochasticity of the electron trajectories in phase space is first derived. Together with extrinsic decorrelation...
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