Application of the integrated transport code for helical plasmas to LHD

The integrated transport simulation system for helical plasmas is developed by extending the 1-dimensional transport code TASK (Transport Analyzing System for tokamaK) into treating 3-dimensional MHD equilibrium. In this study, it is aimed to evaluate the transport property of the LHD plasmas by using this new system. The TASK code is characterized by the combined simulation with modular structure. One of the modules is TASK/PL which works as a platform of the whole code. The interfaces for 3-dimensional MHD equilibrium and the experimental profile data are included in TASK/PL. The input data form for TASK is the UFILE format, which is adopted in the ITER profile database. Therefore, profile data from the LHD experiments are converted to the UFILE format. As a preliminary analysis, the effective thermal transport coefficients, χeff, in the LHD plasmas will be evaluated based on the power balance of steady state using the transport analysis module for tokamaks, TASK/TR. Model simulations can be made by TASK with various transport models, such as the drift wave models, the current-diffusivity driven model, theory based ITG/TEM and ETG models and so on. It is expected that this will be helpful to understand the transport behaviour on LHD. The derived χeff will also be compared with the results from another transport analysis by using PROCTR, which is a transport code for helical plasmas. A new module for transport analysis of helical plasmas, TASK/HT (Helical Transport), will be installed in this integrated simulation system and results with this module will also be reported. (author)