Spreading of lower hybrid wave driven currents in PBX-M

D. W. Ignat; R. Kaita; S. C. Jardin; M. Okabayashi

doi:10.1088/0029-5515/36/12/I12

Spreading of lower hybrid wave driven currents in PBX-M

D. W. Ignat, R. Kaita, S. C. Jardin, M. Okabayashi

PPPL Theory

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10 Scopus citations

Abstract

Lower hybrid current drive (LHCD) in the tokamak Princeton Beta Experiment-Modification (PBX-M) is computed with a dynamic model in order to understand an actual discharge aimed at raising the central q above unity. Such configurations offer advantages for steady state operation and plasma stability. For the particular parameters of this PBX-M experiment, the calculation found singular profiles of plasma current density J and safety factor q developing soon after LHCD begins. Smoothing the lower hybrid wave driven current and power using a diffusion-like equation and a velocity-independent diffusivity for fast-electron current brought the model into reasonable agreement with the measurements if D_fast ≈ 1-0 m²/s. Such a value for D_fast is in the range suggested by other work.

Original language	English (US)
Pages (from-to)	1733-1742
Number of pages	10
Journal	Nuclear Fusion
Volume	36
Issue number	12
DOIs	https://doi.org/10.1088/0029-5515/36/12/I12
State	Published - Dec 1996

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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title = "Spreading of lower hybrid wave driven currents in PBX-M",

abstract = "Lower hybrid current drive (LHCD) in the tokamak Princeton Beta Experiment-Modification (PBX-M) is computed with a dynamic model in order to understand an actual discharge aimed at raising the central q above unity. Such configurations offer advantages for steady state operation and plasma stability. For the particular parameters of this PBX-M experiment, the calculation found singular profiles of plasma current density J and safety factor q developing soon after LHCD begins. Smoothing the lower hybrid wave driven current and power using a diffusion-like equation and a velocity-independent diffusivity for fast-electron current brought the model into reasonable agreement with the measurements if Dfast ≈ 1-0 m2/s. Such a value for Dfast is in the range suggested by other work.",

author = "Ignat, \{D. W.\} and R. Kaita and Jardin, \{S. C.\} and M. Okabayashi",

year = "1996",

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doi = "10.1088/0029-5515/36/12/I12",

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T1 - Spreading of lower hybrid wave driven currents in PBX-M

AU - Ignat, D. W.

AU - Kaita, R.

AU - Jardin, S. C.

AU - Okabayashi, M.

PY - 1996/12

Y1 - 1996/12

N2 - Lower hybrid current drive (LHCD) in the tokamak Princeton Beta Experiment-Modification (PBX-M) is computed with a dynamic model in order to understand an actual discharge aimed at raising the central q above unity. Such configurations offer advantages for steady state operation and plasma stability. For the particular parameters of this PBX-M experiment, the calculation found singular profiles of plasma current density J and safety factor q developing soon after LHCD begins. Smoothing the lower hybrid wave driven current and power using a diffusion-like equation and a velocity-independent diffusivity for fast-electron current brought the model into reasonable agreement with the measurements if Dfast ≈ 1-0 m2/s. Such a value for Dfast is in the range suggested by other work.

AB - Lower hybrid current drive (LHCD) in the tokamak Princeton Beta Experiment-Modification (PBX-M) is computed with a dynamic model in order to understand an actual discharge aimed at raising the central q above unity. Such configurations offer advantages for steady state operation and plasma stability. For the particular parameters of this PBX-M experiment, the calculation found singular profiles of plasma current density J and safety factor q developing soon after LHCD begins. Smoothing the lower hybrid wave driven current and power using a diffusion-like equation and a velocity-independent diffusivity for fast-electron current brought the model into reasonable agreement with the measurements if Dfast ≈ 1-0 m2/s. Such a value for Dfast is in the range suggested by other work.

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SP - 1733

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JF - Nuclear Fusion

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Spreading of lower hybrid wave driven currents in PBX-M

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