Abstract
Transverse diffusion coefficients in a toroidal pinch are investigated for three regions of collision frequencies. The configuration of a toroidal pinch is characterized by a large poloidal magnetic field BP comparable to a toroidal magnetic field BT.
We calculated diffusion coefficients following the scheme of Galeev and Sagdeev.
In a toroidal pinch particles can be trapped in a local magnetic mirror formed by both a toroidal magnetic field and a poloidal magnetic field. Furthermore BP\simeqBT reduces the connection length of a toroidal pinch. Transverse diffusion coefficients including these effects are shown to be smaller than DGS which is given by Galeev and Sagdeev. in the banana region D⊥\simeqDGS\sqrtδ⁄ε is obtained and in the plateau region D⊥\simeqDGS(δ2⁄ε2), where ε denotes an aspect ratio and a small parameter δ denotes the inhomogeneity of the toroidal magnetic field in the toroidal pinch. Here it is noted that a safety factor included in D⊥ may be smaller than or comparable to unity. In the MHD region D⊥ also includes a factor δ⁄ε.
