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

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

ENG - Electrical Engineering

National Institutes of Natural Sciences - National Institute for Fusion Science

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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 language	English
Title of host publication	Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res
Publisher	Publ by IAEA
Pages	301-307
Number of pages	7
ISBN (Print)	9201300913
Publication status	Published - 1991

Publication series

Name	Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res

Cite this

Toi, K., Hamada, Y., Kawahata, K., Watari, T., Ando, A., Ida, K., Morita, S., Kumazawa, R., Oka, Y., Masai, K., Sakamoto, M., Adati, K., Akiyama, R., Hidekuma, S., Hirokura, S., & Kaneko, O. (1991). Study of limiter H- and IOC-modes by control of edge magnetic shear and gas puffing in the JIPP T-IIU Tokamak. In Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res (pp. 301-307). (Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res). Publ by IAEA.

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

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.",

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

year = "1991",

language = "English",

isbn = "9201300913",

series = "Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res",

publisher = "Publ by IAEA",

pages = "301--307",

booktitle = "Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res",

}

Toi, K, Hamada, Y, Kawahata, K, Watari, T, Ando, A, Ida, K, Morita, S, Kumazawa, R, Oka, Y, Masai, K, Sakamoto, M, Adati, K, Akiyama, R, Hidekuma, S, Hirokura, S & Kaneko, O 1991, Study of limiter H- and IOC-modes by control of edge magnetic shear and gas puffing in the JIPP T-IIU Tokamak. in Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res. Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res, Publ by IAEA, pp. 301-307.

Study of limiter H- and IOC-modes by control of edge magnetic shear and gas puffing in the JIPP T-IIU Tokamak. / Toi, K.; Hamada, Y.; Kawahata, K. et al.
Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res. Publ by IAEA, 1991. p. 301-307 (Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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T1 - Study of limiter H- and IOC-modes by control of edge magnetic shear and gas puffing in the JIPP T-IIU Tokamak

AU - Toi, K.

AU - Hamada, Y.

AU - Kawahata, K.

AU - Watari, T.

AU - Ando, A.

AU - Ida, K.

AU - Morita, S.

AU - Kumazawa, R.

AU - Oka, Y.

AU - Masai, K.

AU - Sakamoto, M.

AU - Adati, K.

AU - Akiyama, R.

AU - Hidekuma, S.

AU - Hirokura, S.

AU - Kaneko, O.

PY - 1991

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N2 - 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.

AB - 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.

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M3 - Conference contribution

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SN - 9201300913

T3 - Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res

SP - 301

EP - 307

BT - Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res

PB - Publ by IAEA

ER -

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

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