Study of limiter H- and IOC-modes by control of edge magnetic shear and gas puffing in the JIPP T-IIU Tokamak

K. Toi, Y. Hamada, K. Kawahata, T. Watari, A. Ando, K. Ida, S. Morita, R. Kumazawa, Y. Oka, K. Masai, M. Sakamoto, K. Adati, R. Akiyama, S. Hidekuma, S. Hirokura, O. Kaneko

Research output: Chapter in Book/Report/Conference proceedingConference contribution

11 Citations (Scopus)

Abstract

Two types of improved confinement regime, H-mode and IOC (improved Ohmic confinement) mode, are studied in circular limiter plasmas on JIPP T-IIU. When rapid ramp-down of plasma current (CRD) is used during auxiliary heating, the threshold heating power required for the L-H transition is reduced by 30-50%, compared with that in the case without CRD. This is interpreted as being due to enhancement of the global magnetic shear near the plasma edge by CRD. This model, based on edge magnetic shear is also applicable to the limiter H-mode obtained without CRD by high heating power. In the limiter configuration, the IOC-mode is obtained in ohmically heated, high density plasmas by gas puff control. This improvement may be attributed to a reduction of anomalous transport since radiation loss has only a minor effect.

Original languageEnglish
Title of host publicationProc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res
PublisherPubl by IAEA
Pages301-307
Number of pages7
ISBN (Print)9201300913
Publication statusPublished - 1991 Jan 1
Externally publishedYes

Publication series

NameProc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res

ASJC Scopus subject areas

  • Engineering(all)

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