One-dimensional modeling of transport in small stellarators

K.J.S. Mertens, W.N.G. Hitchon, D.T. Anderson, J.L. Shohet
1988 IEEE Transactions on Plasma Science  
An existing stellarator reactor transport code has been modified in order to model small stellarator experiments. Changes have been made in the treatment of the neutrals, the atomic physics processes, and the transport models. We have investigated the extent to which the hollow density profiles experimentally detected during electron cyclotron resonance heating (ECRH) experiments in the interchangeable module stellarator (IMS), a small modular stellarator, can be modeled. In this, we were
more » ... this, we were guided by the experimental observation of large variations in potential around the magnetic surfaces, which can give rise to radially directed E X B convective flow. A diffusion model based on small-scale convective cell structures cannot simulate the experimental profiles. Including a purely convective term in the particle balance equation allows for a much more accurate modeling of the profiles. A comparison between numerical and experimental results is presented.
doi:10.1109/27.3828 fatcat:2dwmo5xbmvaghkdxvpsu22ykwm