Calculations of 1/n transport for Uragan-2M taking into account the influence of current-feeds and detachable joints of the helical winding

For a numerical investigation of confinement properties of a specific stellarator an appropriate model of the corresponding coil system is necessary. This model is desirable to be as close as possible to the real coil system. In [1] the 1/n transport had been investigated in the "Uragan-2M" (U-2M) torsatron. The magnetic field produced by the helical winding and its necessary spatial derivatives are calculated in that work on the basis of the Biot-Savart law. However this model field is somewhat incomplete since the influence of the current-feeds and of the detachable joints of the helical winding was not taken into account. In other publications [2,3], computations of magnetic surfaces for U-2M have been performed taking into account these additional elements. However, the numerical code used there can not be directly applied to calculations of 1/n transport. Here, the data base for the U-2M coils used in [2,3] is transformed to a new form which is valid for the already existing code for computations of B and its spatial derivatives. With this code, using the transformed data base, computations of the 1/n transport are made for some practically interesting magnetic configurations of U-2M. The obtained results are compared to results of previous works.