Comparison of electron internal transport barriers in the large helical device and JT-60U plasmas

K. Ida, T. Fujita, T. Fukuda, Y. Sakamoto, S. Ide, K. Toi, S. Inagakl, T. Shimozuma, S. Kubo, H. Idei, A. Fujisawa, S. Ohdachi, M. Yoshinuma, H. Funaba, K. Narihara, S. Murakami, A. Wakasa, M. Yokoyama, Y. Takeiri, K. Y. WatanabeK. Tanaka, Y. Liang, N. Ohyabu

研究成果: ジャーナルへの寄稿記事

19 引用 (Scopus)

抄録

Plasmas with an electron internal transport barrier (ITB), which is characterized by peaked electron temperature profiles, are obtained in the JT-60U tokamak and in the large helical device (LHD) when the electron cyclotron heating (ECH) is focused on the magnetic axis. The maximum values of R/L Te, where R is the major radius and LTe is the scale length of the electron temperature gradient, are similar for the LHD and JT-60U ITB plasmas. However, there is a clear jump of R/LTe observed in LHD but not in JT-60U in the ECH power scan. This result is consistent with the fact that the trigger mechanism of the electron ITB is the fast transition of the radial electric field from a small negative Er to a large positive Er in LHD and a change of the magnetic shear from positive to negative is required for the formation of the electron ITB in JT-60U. There are also differences in the electron temperature profiles inside the ITB. The flattening of the electron temperature profile inside the strong ITB could be explained by the sharp increase of q values observed in JT-60U, while no flattening of the electron temperature profile is observed in LHD, where the central q values stay low.

元の言語英語
ページ(範囲)A45-A50
ジャーナルPlasma Physics and Controlled Fusion
46
発行部数5 SUPPL. A
DOI
出版物ステータス出版済み - 5 2004

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Electron temperature
Plasmas
temperature profiles
electron energy
Electrons
electron cyclotron heating
Cyclotrons
electrons
flattening
Heating
Electron transitions
Thermal gradients
guy wires
Electric fields
temperature gradients
actuators
shear
radii
electric fields

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

これを引用

Comparison of electron internal transport barriers in the large helical device and JT-60U plasmas. / Ida, K.; Fujita, T.; Fukuda, T.; Sakamoto, Y.; Ide, S.; Toi, K.; Inagakl, S.; Shimozuma, T.; Kubo, S.; Idei, H.; Fujisawa, A.; Ohdachi, S.; Yoshinuma, M.; Funaba, H.; Narihara, K.; Murakami, S.; Wakasa, A.; Yokoyama, M.; Takeiri, Y.; Watanabe, K. Y.; Tanaka, K.; Liang, Y.; Ohyabu, N.

:: Plasma Physics and Controlled Fusion, 巻 46, 番号 5 SUPPL. A, 05.2004, p. A45-A50.

研究成果: ジャーナルへの寄稿記事

Ida, K, Fujita, T, Fukuda, T, Sakamoto, Y, Ide, S, Toi, K, Inagakl, S, Shimozuma, T, Kubo, S, Idei, H, Fujisawa, A, Ohdachi, S, Yoshinuma, M, Funaba, H, Narihara, K, Murakami, S, Wakasa, A, Yokoyama, M, Takeiri, Y, Watanabe, KY, Tanaka, K, Liang, Y & Ohyabu, N 2004, 'Comparison of electron internal transport barriers in the large helical device and JT-60U plasmas', Plasma Physics and Controlled Fusion, 巻. 46, 番号 5 SUPPL. A, pp. A45-A50. https://doi.org/10.1088/0741-3335/46/5A/004
Ida, K. ; Fujita, T. ; Fukuda, T. ; Sakamoto, Y. ; Ide, S. ; Toi, K. ; Inagakl, S. ; Shimozuma, T. ; Kubo, S. ; Idei, H. ; Fujisawa, A. ; Ohdachi, S. ; Yoshinuma, M. ; Funaba, H. ; Narihara, K. ; Murakami, S. ; Wakasa, A. ; Yokoyama, M. ; Takeiri, Y. ; Watanabe, K. Y. ; Tanaka, K. ; Liang, Y. ; Ohyabu, N. / Comparison of electron internal transport barriers in the large helical device and JT-60U plasmas. :: Plasma Physics and Controlled Fusion. 2004 ; 巻 46, 番号 5 SUPPL. A. pp. A45-A50.
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abstract = "Plasmas with an electron internal transport barrier (ITB), which is characterized by peaked electron temperature profiles, are obtained in the JT-60U tokamak and in the large helical device (LHD) when the electron cyclotron heating (ECH) is focused on the magnetic axis. The maximum values of R/L Te, where R is the major radius and LTe is the scale length of the electron temperature gradient, are similar for the LHD and JT-60U ITB plasmas. However, there is a clear jump of R/LTe observed in LHD but not in JT-60U in the ECH power scan. This result is consistent with the fact that the trigger mechanism of the electron ITB is the fast transition of the radial electric field from a small negative Er to a large positive Er in LHD and a change of the magnetic shear from positive to negative is required for the formation of the electron ITB in JT-60U. There are also differences in the electron temperature profiles inside the ITB. The flattening of the electron temperature profile inside the strong ITB could be explained by the sharp increase of q values observed in JT-60U, while no flattening of the electron temperature profile is observed in LHD, where the central q values stay low.",
author = "K. Ida and T. Fujita and T. Fukuda and Y. Sakamoto and S. Ide and K. Toi and S. Inagakl and T. Shimozuma and S. Kubo and H. Idei and A. Fujisawa and S. Ohdachi and M. Yoshinuma and H. Funaba and K. Narihara and S. Murakami and A. Wakasa and M. Yokoyama and Y. Takeiri and Watanabe, {K. Y.} and K. Tanaka and Y. Liang and N. Ohyabu",
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T1 - Comparison of electron internal transport barriers in the large helical device and JT-60U plasmas

AU - Ida, K.

AU - Fujita, T.

AU - Fukuda, T.

AU - Sakamoto, Y.

AU - Ide, S.

AU - Toi, K.

AU - Inagakl, S.

AU - Shimozuma, T.

AU - Kubo, S.

AU - Idei, H.

AU - Fujisawa, A.

AU - Ohdachi, S.

AU - Yoshinuma, M.

AU - Funaba, H.

AU - Narihara, K.

AU - Murakami, S.

AU - Wakasa, A.

AU - Yokoyama, M.

AU - Takeiri, Y.

AU - Watanabe, K. Y.

AU - Tanaka, K.

AU - Liang, Y.

AU - Ohyabu, N.

PY - 2004/5

Y1 - 2004/5

N2 - Plasmas with an electron internal transport barrier (ITB), which is characterized by peaked electron temperature profiles, are obtained in the JT-60U tokamak and in the large helical device (LHD) when the electron cyclotron heating (ECH) is focused on the magnetic axis. The maximum values of R/L Te, where R is the major radius and LTe is the scale length of the electron temperature gradient, are similar for the LHD and JT-60U ITB plasmas. However, there is a clear jump of R/LTe observed in LHD but not in JT-60U in the ECH power scan. This result is consistent with the fact that the trigger mechanism of the electron ITB is the fast transition of the radial electric field from a small negative Er to a large positive Er in LHD and a change of the magnetic shear from positive to negative is required for the formation of the electron ITB in JT-60U. There are also differences in the electron temperature profiles inside the ITB. The flattening of the electron temperature profile inside the strong ITB could be explained by the sharp increase of q values observed in JT-60U, while no flattening of the electron temperature profile is observed in LHD, where the central q values stay low.

AB - Plasmas with an electron internal transport barrier (ITB), which is characterized by peaked electron temperature profiles, are obtained in the JT-60U tokamak and in the large helical device (LHD) when the electron cyclotron heating (ECH) is focused on the magnetic axis. The maximum values of R/L Te, where R is the major radius and LTe is the scale length of the electron temperature gradient, are similar for the LHD and JT-60U ITB plasmas. However, there is a clear jump of R/LTe observed in LHD but not in JT-60U in the ECH power scan. This result is consistent with the fact that the trigger mechanism of the electron ITB is the fast transition of the radial electric field from a small negative Er to a large positive Er in LHD and a change of the magnetic shear from positive to negative is required for the formation of the electron ITB in JT-60U. There are also differences in the electron temperature profiles inside the ITB. The flattening of the electron temperature profile inside the strong ITB could be explained by the sharp increase of q values observed in JT-60U, while no flattening of the electron temperature profile is observed in LHD, where the central q values stay low.

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