Studies of the neoclassical transport for CNT

The Columbia Nonneutral Torus (CNT) was not optimized with respect to $1/\nu$ neoclassical transport, therefore, such studies are of interest and desirable. For such a task the code SORSSA was adapted to CNT. SORSSA computes a normalized stored energy based on a simple transport model depending on the neoclassical effective ripple $\epsilon_{\rm eff}$. For this purpose $\epsilon_{\rm eff}$ is calculated by following the magnetic field line. Because the magnetic field is computed in real space coordinates directly from coil parameters there is no restriction to the complexity of the magnetic field. First results of computations of the total stored energy are presented. \newline *This work, supported by the European Communities under the contract of Association between EURATOM and the Austrian Academy of Sciences, was carried out within the framework of the European Fusion Development Agreement. The views and opinions expressed herein do not necessarily reflect those of the European Commission. Additional funding is provided by the Austrian Science Foundation, FWF, under contract number P16797-N08.