Plasma Current Profile During Current Reversal in a Tokamak

Abstract

Alternating current operation with one full cycle and a current level of 2.5 k A have been achieved in the CT-6B tokamak. The poloidal magnetic field in the plasma is measured with two internal magnetic probes in repeated discharges. The current distribution is reconstructed with an inversion algorithm. The inversed current first appears on the weak field side. The existence of magnetic surfaces and rotational transform provide particle confinement in the current reversal phase.

Radiation and Vertical Structure of Slim Accretion Disk

“…Unlike the simple case of the stellar atmosphere, the energy transfer in the disk's vertical direction is more complicated. The main differences are: (1) viscous energy dissipation occurs in the radiation field, (2) the gravity depends on the vertical coordinate, (3) the optical depth of the disk is finite. The usual radiative equilibrium should be replaced by the budget of total energy.…”