Collisional damping of electron bernstein waves and its mitigation by evaporated lithium conditioning in spherical-tokamak plasmas

S. J. Diem; G. Taylor; J. B. Caughman; P. C. Efthimion; H. Kugel; B. P. Leblanc; C. K. Phillips; J. Preinhaelter; S. A. Sabbagh; J. Urban

doi:10.1103/PhysRevLett.103.015002

Collisional damping of electron bernstein waves and its mitigation by evaporated lithium conditioning in spherical-tokamak plasmas

S. J. Diem
, G. Taylor
, J. B. Caughman
, P. C. Efthimion
, H. Kugel
, B. P. Leblanc
, C. K. Phillips
, J. Preinhaelter
, S. A. Sabbagh
, J. Urban

Fusion Technology

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

22 Scopus citations

Abstract

The first experimental verification of electron Bernstein wave (EBW) collisional damping, and its mitigation by evaporated Li conditioning, in an overdense spherical-tokamak plasma has been observed in the National Spherical Torus Experiment (NSTX). Initial measurements of EBW emission, coupled from NSTX plasmas via double-mode conversion to O-mode waves, exhibited <10% transmission efficiencies. Simulations show 80% of the EBW energy is dissipated by collisions in the edge plasma. Li conditioning reduced the edge collision frequency by a factor of 3 and increased the fundamental EBW transmission to 60%.

Original language	English
Article number	015002
Journal	Physical Review Letters
Volume	103
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevLett.103.015002
State	Published - Jun 30 2009

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Diem, S. J., Taylor, G., Caughman, J. B., Efthimion, P. C., Kugel, H., Leblanc, B. P., Phillips, C. K., Preinhaelter, J., Sabbagh, S. A., & Urban, J. (2009). Collisional damping of electron bernstein waves and its mitigation by evaporated lithium conditioning in spherical-tokamak plasmas. Physical Review Letters, 103(1), Article 015002. https://doi.org/10.1103/PhysRevLett.103.015002

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abstract = "The first experimental verification of electron Bernstein wave (EBW) collisional damping, and its mitigation by evaporated Li conditioning, in an overdense spherical-tokamak plasma has been observed in the National Spherical Torus Experiment (NSTX). Initial measurements of EBW emission, coupled from NSTX plasmas via double-mode conversion to O-mode waves, exhibited <10\% transmission efficiencies. Simulations show 80\% of the EBW energy is dissipated by collisions in the edge plasma. Li conditioning reduced the edge collision frequency by a factor of 3 and increased the fundamental EBW transmission to 60\%.",

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AU - Diem, S. J.

AU - Taylor, G.

AU - Caughman, J. B.

AU - Efthimion, P. C.

AU - Kugel, H.

AU - Leblanc, B. P.

AU - Phillips, C. K.

AU - Preinhaelter, J.

AU - Sabbagh, S. A.

AU - Urban, J.

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AB - The first experimental verification of electron Bernstein wave (EBW) collisional damping, and its mitigation by evaporated Li conditioning, in an overdense spherical-tokamak plasma has been observed in the National Spherical Torus Experiment (NSTX). Initial measurements of EBW emission, coupled from NSTX plasmas via double-mode conversion to O-mode waves, exhibited <10% transmission efficiencies. Simulations show 80% of the EBW energy is dissipated by collisions in the edge plasma. Li conditioning reduced the edge collision frequency by a factor of 3 and increased the fundamental EBW transmission to 60%.

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DO - 10.1103/PhysRevLett.103.015002

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JO - Physical Review Letters

JF - Physical Review Letters

IS - 1

M1 - 015002

ER -

Collisional damping of electron bernstein waves and its mitigation by evaporated lithium conditioning in spherical-tokamak plasmas

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