Monitoring alfvén cascades with interferometry on the JET tokamak

S. E. Sharapov; B. Alper; J. Fessey; N. C. Hawkes; N. P. Young; R. Nazikian; G. J. Kramer; D. N. Borba; S. Hacquin; E. De La Luna; S. D. Pinches; J. Rapp; D. Testa

doi:10.1103/PhysRevLett.93.165001

Monitoring alfvén cascades with interferometry on the JET tokamak

S. E. Sharapov, B. Alper, J. Fessey, N. C. Hawkes, N. P. Young, R. Nazikian, G. J. Kramer, D. N. Borba, S. Hacquin, E. De La Luna, S. D. Pinches, J. Rapp, D. Testa

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83 Scopus citations

Abstract

A discrete spectrum of Alfvén cascade (AC) eigenmodes excited with fast ions in reversed magnetic shear plasmas of the Joint European Torus was detected by using a microwave interferometry technique. It was shown that the unprecedented frequency and time resolution superior to that obtained with external magnetic coils by the interferometry measurements of plasma perturbations associated with ACs. The evolution of the safety factor and density of rotational magnetic surfaces in the region of maximum plasma current was monitored by using the measurements of ACs. It was shown that the beam propagating through the plasma was reflecting from the inner wall of the torus in the interferometry regime.

Original language	English
Article number	165001
Pages (from-to)	165001-1-165001-4
Journal	Physical Review Letters
Volume	93
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevLett.93.165001
State	Published - Oct 15 2004
Externally published	Yes

Funding

This work was partly funded by Euratom and by the UK Engineering and Physical Sciences Research Council. This work was performed under the European Fusion Development Agreement.

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1103/PhysRevLett.93.165001

Cite this

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title = "Monitoring alfv{\'e}n cascades with interferometry on the JET tokamak",

abstract = "A discrete spectrum of Alfv{\'e}n cascade (AC) eigenmodes excited with fast ions in reversed magnetic shear plasmas of the Joint European Torus was detected by using a microwave interferometry technique. It was shown that the unprecedented frequency and time resolution superior to that obtained with external magnetic coils by the interferometry measurements of plasma perturbations associated with ACs. The evolution of the safety factor and density of rotational magnetic surfaces in the region of maximum plasma current was monitored by using the measurements of ACs. It was shown that the beam propagating through the plasma was reflecting from the inner wall of the torus in the interferometry regime.",

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doi = "10.1103/PhysRevLett.93.165001",

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AU - Sharapov, S. E.

AU - Alper, B.

AU - Fessey, J.

AU - Hawkes, N. C.

AU - Young, N. P.

AU - Nazikian, R.

AU - Kramer, G. J.

AU - Borba, D. N.

AU - Hacquin, S.

AU - De La Luna, E.

AU - Pinches, S. D.

AU - Rapp, J.

AU - Testa, D.

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Monitoring alfvén cascades with interferometry on the JET tokamak

Abstract

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