[Table of Contents]

Plasma and Fusion Research

Volume 2, 047 (2007)

Letters

Pellet Injection and Internal Diffusion Barrier Formation in Large Helical Device
Ryuichi SAKAMOTO, Hiroshi YAMADA, Nobuyoshi OHYABU, Masahiro KOBAYASHI, Junichi MIYAZAWA, Satoshi OHDACHI, Tomohiro MORISAKI, Suguru MASUZAKI, Ichihiro YAMADA, Kazumichi NARIHARA, Motoshi GOTO, Shigeru MORITA, Satoru SAKAKIBARA, Kenji TANAKA, Kazuo KAWAHATA, Akio KOMORI, Osamu MOTOJIMA and LHD experimental group
National Institute for Fusion Science
(Received 21 August 2007 / Accepted 22 October 2007 / Published 15 November 2007)

Abstract

A high density internal diffusion barrier has been produced in the intrinsic helical divertor configuration in LHD by optimizing the pellet fueling scenario and magnetic configuration. The internal diffusion barrier easily appears in the outer shifted magnetic configuration in which magneto-hydrodynamic stability properties are considered to be favorable. The attainable central plasma density becomes higher as the magnetic axis shifts outward and the central density exceed 5 × 1020 m-3. Central pressure exceeds 130 kPa and, therefore, very large Shafranov shift is observed, even at high magnetic field (Bt > 2.54 T).

Keywords

stellarator, internal diffusion barrier, pellet fueling, divertor, magnetic configuration

DOI: 10.1585/pfr.2.047

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This paper may be cited as follows:

Ryuichi SAKAMOTO, Hiroshi YAMADA, Nobuyoshi OHYABU, Masahiro KOBAYASHI, Junichi MIYAZAWA, Satoshi OHDACHI, Tomohiro MORISAKI, Suguru MASUZAKI, Ichihiro YAMADA, Kazumichi NARIHARA, Motoshi GOTO, Shigeru MORITA, Satoru SAKAKIBARA, Kenji TANAKA, Kazuo KAWAHATA, Akio KOMORI, Osamu MOTOJIMA and LHD experimental group, Plasma Fusion Res. 2, 047 (2007).