Observation of Velocity-Independent Electron Transport in the Reversed Field Pinch

R. O’Connell; D. J.Den Hartog; C. B. Forest; J. K. Anderson; T. M. Biewer; B. E. Chapman; D. Craig; G. Fiksel; S. C. Prager; J. S. Sarff; S. D. Terry; R. W. Harvey

doi:10.1103/PhysRevLett.91.045002

Observation of Velocity-Independent Electron Transport in the Reversed Field Pinch

R. O’Connell, D. J.Den Hartog, C. B. Forest, J. K. Anderson, T. M. Biewer, B. E. Chapman, D. Craig, G. Fiksel, S. C. Prager, J. S. Sarff, S. D. Terry, R. W. Harvey

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

37 Scopus citations

Abstract

Confinement of runaway electrons has been observed for the first time in a reversed field pinch during improved-confinement plasmas in the Madison Symmetric Torus. Energy-resolved hard-x-ray flux measurements have been used to determine the velocity dependence of the electron diffusion coefficient, utilizing computational solutions of the Fokker-Planck transport equation. With improved-confinement, the fast electron diffusivity drops by 2 orders of magnitude and is independent of velocity. This suggests a change in the transport mechanism away from stochastic magnetic field diffusion.

Original language	English
Journal	Physical Review Letters
Volume	91
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevLett.91.045002
State	Published - Jul 24 2003
Externally published	Yes

Funding

This work was supported by the U.S. Department of Energy. The authors wish to recognize the many contributions of the UW-Madison MST group, including collaborators from UCLA; David Brower and Weixing Ding and CEA Cadarache; Yves Peysson and Léna Delpech.

Funders	Funder number
U.S. Department of Energy

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10.1103/PhysRevLett.91.045002

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title = "Observation of Velocity-Independent Electron Transport in the Reversed Field Pinch",

abstract = "Confinement of runaway electrons has been observed for the first time in a reversed field pinch during improved-confinement plasmas in the Madison Symmetric Torus. Energy-resolved hard-x-ray flux measurements have been used to determine the velocity dependence of the electron diffusion coefficient, utilizing computational solutions of the Fokker-Planck transport equation. With improved-confinement, the fast electron diffusivity drops by 2 orders of magnitude and is independent of velocity. This suggests a change in the transport mechanism away from stochastic magnetic field diffusion.",

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AU - O’Connell, R.

AU - Hartog, D. J.Den

AU - Forest, C. B.

AU - Anderson, J. K.

AU - Biewer, T. M.

AU - Chapman, B. E.

AU - Craig, D.

AU - Fiksel, G.

AU - Prager, S. C.

AU - Sarff, J. S.

AU - Terry, S. D.

AU - Harvey, R. W.

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N2 - Confinement of runaway electrons has been observed for the first time in a reversed field pinch during improved-confinement plasmas in the Madison Symmetric Torus. Energy-resolved hard-x-ray flux measurements have been used to determine the velocity dependence of the electron diffusion coefficient, utilizing computational solutions of the Fokker-Planck transport equation. With improved-confinement, the fast electron diffusivity drops by 2 orders of magnitude and is independent of velocity. This suggests a change in the transport mechanism away from stochastic magnetic field diffusion.

AB - Confinement of runaway electrons has been observed for the first time in a reversed field pinch during improved-confinement plasmas in the Madison Symmetric Torus. Energy-resolved hard-x-ray flux measurements have been used to determine the velocity dependence of the electron diffusion coefficient, utilizing computational solutions of the Fokker-Planck transport equation. With improved-confinement, the fast electron diffusivity drops by 2 orders of magnitude and is independent of velocity. This suggests a change in the transport mechanism away from stochastic magnetic field diffusion.

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Observation of Velocity-Independent Electron Transport in the Reversed Field Pinch

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