Modification of Pfirsch-Schlüter particle diffusion by resonant magnetic perturbation

Abstract

Plasma transport across the magnetic field is studied in the presence of resonant helical magnetic perturbations giving rise to isolated magnetic islands.

Pygmy dipole resonance in the well-deformed even–even 152–162Gd

“…It is well known in the quasi-particle model that 1 − dipole vibrations contain zero-energy spurious admixtures from the centre-of-mass (c.m.) motion [46,47]. Separating the spurious state with energy ω 0 = 0 from the vibrational ones is one of the fundamental requirements for implementing microscopic models.…”

Particle transport studies with applied resonant fields on TEXT

“…In this case a linear increase in D is predicted with I h . Finally, corrections to the Pfirsch-Schluter particle diffusion by the presence of magnetic islands have been calculated [18], D p s = p e 2 ,; ei (a x /(T 1 )(8/n 6 ) ( R / r ^4, with p e the electron Larmor radius, v ti the electron-ion collision frequency, a ± and <j\ the perpendicular and parallel conductivities, and r ^ the radius of the m/n resonant surface. For n = 1, D p s can be large, but for TEXT, with n = 3, D p s < 1 x 10" 4 m^s" 1 .…”

Calculation of transport processes in the Pfirsch-Schluter regime in stellarators

“…The co-ordinate p (d/d7 = (B,/p) (dldp)) was used as the integration variable in the system of equations discussed in Section 2. In this case, the whole system of equations required for the calculation comprises Eqs (15) and (16) from Ref. [lo] (which defines the co-ordinates of the magnetic field lines and the distribution of V Q along these lines), supplemented by the following equations: x are determined from f,, x1 and x2.…”

“…Finally, in connection with the problems that have been examined in this paper, we would draw the reader's attention to Refs [16][17][18][19][20][21] which analyse certain features of Pfirsch-Schluter diffusion in toroidal traps in the presence of a helical magnetic field at fairly small distances from the magnetic axis, including the possibility of impurity flux reversal by local particle and heat sources. In contrast to these papers, the method examined here enables us to perform investigations at any distance from the magnetix axis.…”