Beam transport code for the KSTAR NB heating system

Beam transport with re-ionization (BTR) code for KSTAR neutral beam heating system has been developed 1) to describe the neutral beam production and transmission in the beam line; 2) to simulate the processes accompanying the beam transport; 3) to determine the power deposition onto the neutral beam line components; and 4) to reproduce the real operational conditions of the system in presence of magnetic fields and background gas. This code is available in calculating the beam losses along the beam line, and in obtaining the footprints of the beam at the selected cross-sections. Also it could be useful in defining the acceptable level of the residual magnetic field, and in estimating the effect of tokamak stray field on the re-ionized flux. The models and calculated results with BTR code are described in this paper.