Plasma dynamics and quasi equilibrium in simply toroidal plasma in open field line configuration
POSTER
Abstract
In simply magnetized toroidal (SMT) device plasma is confined purely by toroidal field having close field line configuration. The crossfield transport arising from the E x B drift severely affects the plasma confinement and causes the entire plasma to be lost to the outer wall and prevents the plasma to be in MHD equilibrium. In this study a finite vertical field of 0.3 mT is superimposed to the toroidal field of 0.04 T, resulting in opening of the field lines characterized by a pitch ratio of r$_{\mathrm{B}}=$B$_{\mathrm{Z}}$/B\textasciitilde 7.5 x 10$^{\mathrm{-3}}$ and L$_{\mathrm{C}}=$2a(B$_{\mathrm{T}}$/B$_{\mathrm{Z}})$\textasciitilde 2333 cm in filamentary hydrogen plasma. This short circuiting the current and limiting the electric field buildup and hence brings system to a quasi-stationary equilibrium. The time averaged profiles were analyzed and spatiotemporal evolution of structures has been studied by conditional sampling techniques and other statistical tools. Typical plasma parameters are n$_{\mathrm{e}}$\textasciitilde 10$^{\mathrm{16\thinspace }}$m$^{\mathrm{-3}}$, T$_{\mathrm{e}}=$1-10 eV, T$_{\mathrm{i}}=$1 eV, $\nu =_{\mathrm{ExB}}=$3 x 10$^{\mathrm{3}}$ m/s and $\Gamma _{\mathrm{ExB}}=$10$^{\mathrm{19}}$m$^{\mathrm{-2}}$s$^{\mathrm{-1}}$.
Authors
-
Prince Alex
University of Milan, Bicocca
-
Ruggero Barni
University of Milan, Bicocca
-
Ruggero Barni
University of Milan, Bicocca