Control of the radial electric field shear by modification of the magnetic field configuration in LHD

K. Ida; M. Yoshinuma; M. Yokoyama; S. Inagaki; N. Tamura; B. J. Peterson; T. Morisaki; S. Masuzaki; A. Komori; Y. Nagayama; K. Tanaka; K. Narihara; K. Y. Watanabe; C. D. Beidler

doi:10.1088/0029-5515/45/5/010

Control of the radial electric field shear by modification of the magnetic field configuration in LHD

K. Ida, M. Yoshinuma, M. Yokoyama, S. Inagaki, N. Tamura, B. J. Peterson, T. Morisaki, S. Masuzaki, A. Komori, Y. Nagayama, K. Tanaka, K. Narihara, K. Y. Watanabe, C. D. Beidler

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

40 Citations (Scopus)

Abstract

Control of the radial electric field, E_r, is considered to be important in helical plasmas, because the radial electric field and its shear are expected to reduce neoclassical and anomalous transport, respectively. In general, the radial electric field can be controlled by changing the collisionality, and positive or negative electric fields have been obtained by decreasing or increasing the electron density, respectively. Although the sign of the radial electric field can be controlled by changing the collisionality, modification of the magnetic field is required to achieve further control of the radial electric field, especially to produce a strong radial electric field shear. In the Large Helical Device (LHD) the radial electric field profiles are shown to be controlled by the modification of the magnetic field by (1) changing the radial profile of the effective helical ripples, ε _h, (2) creating a magnetic island with an external perturbation field coil and (3) changing the local island divertor coil current.

Original language	English
Pages (from-to)	391-398
Number of pages	8
Journal	Nuclear Fusion
Volume	45
Issue number	5
DOIs	https://doi.org/10.1088/0029-5515/45/5/010
Publication status	Published - May 1 2005
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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10.1088/0029-5515/45/5/010

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Ida, K., Yoshinuma, M., Yokoyama, M., Inagaki, S., Tamura, N., Peterson, B. J., Morisaki, T., Masuzaki, S., Komori, A., Nagayama, Y., Tanaka, K., Narihara, K., Watanabe, K. Y., & Beidler, C. D. (2005). Control of the radial electric field shear by modification of the magnetic field configuration in LHD. Nuclear Fusion, 45(5), 391-398. https://doi.org/10.1088/0029-5515/45/5/010

Control of the radial electric field shear by modification of the magnetic field configuration in LHD. / Ida, K.; Yoshinuma, M.; Yokoyama, M.; Inagaki, S.; Tamura, N.; Peterson, B. J.; Morisaki, T.; Masuzaki, S.; Komori, A.; Nagayama, Y.; Tanaka, K.; Narihara, K.; Watanabe, K. Y.; Beidler, C. D.

In: Nuclear Fusion, Vol. 45, No. 5, 01.05.2005, p. 391-398.

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

Ida, K, Yoshinuma, M, Yokoyama, M, Inagaki, S, Tamura, N, Peterson, BJ, Morisaki, T, Masuzaki, S, Komori, A, Nagayama, Y, Tanaka, K, Narihara, K, Watanabe, KY & Beidler, CD 2005, 'Control of the radial electric field shear by modification of the magnetic field configuration in LHD', Nuclear Fusion, vol. 45, no. 5, pp. 391-398. https://doi.org/10.1088/0029-5515/45/5/010

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