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 journalArticle

36 Citations (Scopus)

Abstract

Control of the radial electric field, Er, 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 languageEnglish
Pages (from-to)391-398
Number of pages8
JournalNuclear Fusion
Volume45
Issue number5
DOIs
Publication statusPublished - May 1 2005
Externally publishedYes

Fingerprint

magnetic field configurations
shear
electric fields
field coils
magnetic islands
profiles
ripples
magnetic fields
coils
perturbation

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Ida, K., Yoshinuma, M., Yokoyama, M., Inagaki, S., Tamura, N., Peterson, B. J., ... 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 journalArticle

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
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. / Control of the radial electric field shear by modification of the magnetic field configuration in LHD. In: Nuclear Fusion. 2005 ; Vol. 45, No. 5. pp. 391-398.
@article{4041270350454e72a63802d59554475f,
title = "Control of the radial electric field shear by modification of the magnetic field configuration in LHD",
abstract = "Control of the radial electric field, Er, 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.",
author = "K. Ida and M. Yoshinuma and M. Yokoyama and S. Inagaki and N. Tamura and Peterson, {B. J.} and T. Morisaki and S. Masuzaki and A. Komori and Y. Nagayama and K. Tanaka and K. Narihara and Watanabe, {K. Y.} and Beidler, {C. D.}",
year = "2005",
month = "5",
day = "1",
doi = "10.1088/0029-5515/45/5/010",
language = "English",
volume = "45",
pages = "391--398",
journal = "Nuclear Fusion",
issn = "0029-5515",
publisher = "IOP Publishing Ltd.",
number = "5",

}

TY - JOUR

T1 - Control of the radial electric field shear by modification of the magnetic field configuration in LHD

AU - Ida, K.

AU - Yoshinuma, M.

AU - Yokoyama, M.

AU - Inagaki, S.

AU - Tamura, N.

AU - Peterson, B. J.

AU - Morisaki, T.

AU - Masuzaki, S.

AU - Komori, A.

AU - Nagayama, Y.

AU - Tanaka, K.

AU - Narihara, K.

AU - Watanabe, K. Y.

AU - Beidler, C. D.

PY - 2005/5/1

Y1 - 2005/5/1

N2 - Control of the radial electric field, Er, 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.

AB - Control of the radial electric field, Er, 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.

UR - http://www.scopus.com/inward/record.url?scp=21144456717&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=21144456717&partnerID=8YFLogxK

U2 - 10.1088/0029-5515/45/5/010

DO - 10.1088/0029-5515/45/5/010

M3 - Article

AN - SCOPUS:21144456717

VL - 45

SP - 391

EP - 398

JO - Nuclear Fusion

JF - Nuclear Fusion

SN - 0029-5515

IS - 5

ER -