Effects of the Presence of an Iron Core on Toroidal Helical Magnetic Fields

Abstract

This paper examines theoretically two different effects which are sometimes encountered in double probe measurements under continuum large-Debye-length conditions: (i) Electron emission due to the de-excitation of metastable atoms and molecules on the probe surface, and (ii) asymmetric double probe characteristics that result from number-density gradients on the plasma. Electron emission is shown to have little effect on the probe characteristics. A method of analysing asymmetric double probe characteristics is discussed.

Recent stellarator research

“…It is very important for the construction of stellarator devices to estimate the effect of geometrical errors in the coil arrangement or of perturbing magnetic fields on the quality of the magnetic surfaces. There are several results of calculations of these effects [53][54][55][56][57]. The typical geometrical accuracy 6 required for helical coils is 5/R £ 0.001 where R is the major radius.…”