Pattern of ion bombardment on the poloidal divertor plates


Daybelge U., Yarim C.

JOURNAL OF NUCLEAR MATERIALS, vol.266, pp.809-811, 1999 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 266
  • Publication Date: 1999
  • Doi Number: 10.1016/s0022-3115(98)00605-9
  • Title of Journal : JOURNAL OF NUCLEAR MATERIALS
  • Page Numbers: pp.809-811

Abstract

The chaotic behaviour of particle drift orbits ending on the target plates in a poloidal divertor tokamak is studied. The source of the chaotic motion is taken to be the non-axisymmetric magnetic field perturbations. As is well known from the Chirikov-Taylor-map studies, near the separatrix, the perturbed magnetic field lines also develop a structure with various islands immersed in a chaotic sea. Following ion drift orbits across such a separatrix layer, it is shown here that particle orbits also develop both chaotic and coherent layers. Hence, the ion heat flux transported along such orbits displays a corresponding inhomogeneous distribution over the divertor plates. (C) 1999 Elsevier Science B.V. All rights reserved.