[Table of Contents]

Plasma and Fusion Research

Volume 7, 1303006 (2012)

Letters

Modeling of Drift Displacement of the Pellet Ablated Material for Outboard Side Injection in Large Helical Device
Akinobu MATSUYAMA, Florian KOECHL1), Bernard PÉGOURIÉ2), Ryuichi SAKAMOTO, Gen MOTOJIMA and Hiroshi YAMADA
National Institute for Fusion Science, Toki 509-5292, Japan
1)
Association EURATOM-ÖAW/ATI, Atominstitut, TU Wien, 1020 Vienna, Austria
2)
CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
(Received 10 November 2011 / Accepted 22 December 2011 / Published 27 January 2012)

Abstract

The outward drift displacement of the pellet ablated material is studied for low-field side injection in the Large Helical Device (LHD). Stopping of the drift acceleration is shown to be mainly due to the formation of an internal current circuit owing to helical variation of the magnetic field gradient. This process is the most efficient for stopping the cross-field motion of the ablatant in the LHD because, in helical configurations, the parallel scale length of the gradient variation is shorter than in tokamaks. Simulated ablation and deposition profiles are shown to compare well with the Hα emission and post-injection density and temperature profiles.

Keywords

pellet injection, ∇B-induced drift displacement, fueling efficiency, Large Helical Device

DOI: 10.1585/pfr.7.1303006

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This paper may be cited as follows:

Akinobu MATSUYAMA, Florian KOECHL, Bernard PÉGOURIÉ, Ryuichi SAKAMOTO, Gen MOTOJIMA and Hiroshi YAMADA, Plasma Fusion Res. 7, 1303006 (2012).