Heating and non-inductive current drive by negative ion based NBI in JT-60U

T. Oikawa; K. Ushigusa; C. B. Forest; M. Nemoto; O. Naito; Y. Kusama; Y. Kamada; K. Tobita; S. Suzuki; T. Fujita; H. Shirai; T. Fukuda; M. Kuriyama; T. Itoh; Y. Okumura; K. Watanabe; L. Grisham

doi:10.1088/0029-5515/40/3Y/301

Heating and non-inductive current drive by negative ion based NBI in JT-60U

T. Oikawa, K. Ushigusa, C. B. Forest, M. Nemoto, O. Naito, Y. Kusama, Y. Kamada, K. Tobita, S. Suzuki, T. Fujita, H. Shirai, T. Fukuda, M. Kuriyama, T. Itoh, Y. Okumura, K. Watanabe, L. Grisham

ENG - Quantum Science and Energy Engineering

Research output: Contribution to journal › Article › peer-review

43 Citations (Scopus)

Abstract

The current drive and heating properties of negative ion based NBI have been studied comprehensively in JT-60U. It has been confirmed from shine-through measurements of the injected beam (350 keV) that multistep ionization processes are essential in the ionization processes of high energy particles. The profile of the current density driven by a negative ion based NB (N-NB) has been determined experimentally. This is in good agreement with the theoretical prediction, and N-NB driven current reached 0.6 MA with E_B = 360 keV and P_INJ = 3.7 MW. The current drive efficiency η_CD is increased by increasing electron temperature and improved by increasing beam energy. The fast ions from N-NBs are well confined in the enhanced confinement core by the weak poloidal magnetic field of reversed shear plasmas. A clear H mode transition was obtained with N-NB dominant heating, where the net absorbed power required for an H mode transition seemed similar to the previous result obtained in JT-60U using a low energy beam (90 keV). With the strong electron heating by N-NBI (80% absorbed by electrons), an H factor (= τ_E/τ_E^ITER-89PL) of 1.64 with T_e(0) = 1.4T_i(0) was obtained in the steady state ELMy phase.

Original language	English
Pages (from-to)	435-443
Number of pages	9
Journal	Nuclear Fusion
Volume	40
Issue number	SPEC. ISS. 3
DOIs	https://doi.org/10.1088/0029-5515/40/3Y/301
Publication status	Published - 2000

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Oikawa, T., Ushigusa, K., Forest, C. B., Nemoto, M., Naito, O., Kusama, Y., Kamada, Y., Tobita, K., Suzuki, S., Fujita, T., Shirai, H., Fukuda, T., Kuriyama, M., Itoh, T., Okumura, Y., Watanabe, K., & Grisham, L. (2000). Heating and non-inductive current drive by negative ion based NBI in JT-60U. Nuclear Fusion, 40(SPEC. ISS. 3), 435-443. https://doi.org/10.1088/0029-5515/40/3Y/301

@article{96f81f4ad9d2423b900a4a96605dcf5a,

title = "Heating and non-inductive current drive by negative ion based NBI in JT-60U",

abstract = "The current drive and heating properties of negative ion based NBI have been studied comprehensively in JT-60U. It has been confirmed from shine-through measurements of the injected beam (350 keV) that multistep ionization processes are essential in the ionization processes of high energy particles. The profile of the current density driven by a negative ion based NB (N-NB) has been determined experimentally. This is in good agreement with the theoretical prediction, and N-NB driven current reached 0.6 MA with EB = 360 keV and PINJ = 3.7 MW. The current drive efficiency ηCD is increased by increasing electron temperature and improved by increasing beam energy. The fast ions from N-NBs are well confined in the enhanced confinement core by the weak poloidal magnetic field of reversed shear plasmas. A clear H mode transition was obtained with N-NB dominant heating, where the net absorbed power required for an H mode transition seemed similar to the previous result obtained in JT-60U using a low energy beam (90 keV). With the strong electron heating by N-NBI (80% absorbed by electrons), an H factor (= τE/τEITER-89PL) of 1.64 with Te(0) = 1.4Ti(0) was obtained in the steady state ELMy phase.",

author = "T. Oikawa and K. Ushigusa and Forest, {C. B.} and M. Nemoto and O. Naito and Y. Kusama and Y. Kamada and K. Tobita and S. Suzuki and T. Fujita and H. Shirai and T. Fukuda and M. Kuriyama and T. Itoh and Y. Okumura and K. Watanabe and L. Grisham",

year = "2000",

doi = "10.1088/0029-5515/40/3Y/301",

language = "English",

volume = "40",

pages = "435--443",

journal = "Nuclear Fusion",

issn = "0029-5515",

publisher = "IOP Publishing Ltd.",

number = "SPEC. ISS. 3",

}

Oikawa, T, Ushigusa, K, Forest, CB, Nemoto, M, Naito, O, Kusama, Y, Kamada, Y, Tobita, K, Suzuki, S, Fujita, T, Shirai, H, Fukuda, T, Kuriyama, M, Itoh, T, Okumura, Y, Watanabe, K & Grisham, L 2000, 'Heating and non-inductive current drive by negative ion based NBI in JT-60U', Nuclear Fusion, vol. 40, no. SPEC. ISS. 3, pp. 435-443. https://doi.org/10.1088/0029-5515/40/3Y/301

TY - JOUR

T1 - Heating and non-inductive current drive by negative ion based NBI in JT-60U

AU - Oikawa, T.

AU - Ushigusa, K.

AU - Forest, C. B.

AU - Nemoto, M.

AU - Naito, O.

AU - Kusama, Y.

AU - Kamada, Y.

AU - Tobita, K.

AU - Suzuki, S.

AU - Fujita, T.

AU - Shirai, H.

AU - Fukuda, T.

AU - Kuriyama, M.

AU - Itoh, T.

AU - Okumura, Y.

AU - Watanabe, K.

AU - Grisham, L.

PY - 2000

Y1 - 2000

N2 - The current drive and heating properties of negative ion based NBI have been studied comprehensively in JT-60U. It has been confirmed from shine-through measurements of the injected beam (350 keV) that multistep ionization processes are essential in the ionization processes of high energy particles. The profile of the current density driven by a negative ion based NB (N-NB) has been determined experimentally. This is in good agreement with the theoretical prediction, and N-NB driven current reached 0.6 MA with EB = 360 keV and PINJ = 3.7 MW. The current drive efficiency ηCD is increased by increasing electron temperature and improved by increasing beam energy. The fast ions from N-NBs are well confined in the enhanced confinement core by the weak poloidal magnetic field of reversed shear plasmas. A clear H mode transition was obtained with N-NB dominant heating, where the net absorbed power required for an H mode transition seemed similar to the previous result obtained in JT-60U using a low energy beam (90 keV). With the strong electron heating by N-NBI (80% absorbed by electrons), an H factor (= τE/τEITER-89PL) of 1.64 with Te(0) = 1.4Ti(0) was obtained in the steady state ELMy phase.

AB - The current drive and heating properties of negative ion based NBI have been studied comprehensively in JT-60U. It has been confirmed from shine-through measurements of the injected beam (350 keV) that multistep ionization processes are essential in the ionization processes of high energy particles. The profile of the current density driven by a negative ion based NB (N-NB) has been determined experimentally. This is in good agreement with the theoretical prediction, and N-NB driven current reached 0.6 MA with EB = 360 keV and PINJ = 3.7 MW. The current drive efficiency ηCD is increased by increasing electron temperature and improved by increasing beam energy. The fast ions from N-NBs are well confined in the enhanced confinement core by the weak poloidal magnetic field of reversed shear plasmas. A clear H mode transition was obtained with N-NB dominant heating, where the net absorbed power required for an H mode transition seemed similar to the previous result obtained in JT-60U using a low energy beam (90 keV). With the strong electron heating by N-NBI (80% absorbed by electrons), an H factor (= τE/τEITER-89PL) of 1.64 with Te(0) = 1.4Ti(0) was obtained in the steady state ELMy phase.

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U2 - 10.1088/0029-5515/40/3Y/301

DO - 10.1088/0029-5515/40/3Y/301

M3 - Article

AN - SCOPUS:0033878329

SN - 0029-5515

VL - 40

SP - 435

EP - 443

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - SPEC. ISS. 3

ER -

Heating and non-inductive current drive by negative ion based NBI in JT-60U

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