Measurements Of Current Density Profiles Research Articles

Measurements of current density profiles in T-10 current drive regimes using carbon pellet injection

The model of toroiidal acceleration of carbon pellets in tokamaks has been improved by taking into account the angle distribution of ablated atoms. A simpler connection between the asymmetry of the electron heat fluxes and the toroidal pellet acceleration is also used that does not require a knowledge of the pellet shape evolution during ablation. The improved model has been applied to measurements of current density profiles after the electron cyclotron current drive (ECCD) pulses with co- and counter-directions of the inductive plasma current relative to the direction of the current driven by means of the gyrotron emission. Results indicate a difference of the current density profiles measured in co- and counter-directions of the gyrotron emission.

A Toroidal Discharge with Multipole Field (Asperator T-1)

The toroidal discharge experiments in a small device with a multipole field, having an air core transformer arranged arround a plasma column in the vacuum chamber, are described. A stable discharge with a small safety factor (q≈0.8) is obtained when the plasma current is 13 kA and the toroidal field 4 kG. The magnetic probe measurements show that the plasma current region is isolated from the multipole field coil. The effect of the vertical magnetic field on a plasma current is investigated by the measurement of current density profiles.