The magnetic structure of long-wavelength magnetohydrodynamic modes in current-carrying stellarator plasmas
Magnetic field fluctuations are observed in current-carrying stellarator plasmas when the rotational transform is close to a rational value at the edge of the plasma. At low plasma pressure, these fluctuations are associated with perturbed currents parallel to the equilibrium magnetic field lines. A...
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| Veröffentlicht in: | Physics of plasmas 2021-11, Vol.28 (11) |
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| creator | Pandya, M. D. Ennis, D. A. Hanson, J. D. Hartwell, G. J. Maurer, D. A. |
| description | Magnetic field fluctuations are observed in current-carrying stellarator plasmas when the rotational transform is close to a rational value at the edge of the plasma. At low plasma pressure, these fluctuations are associated with perturbed currents parallel to the equilibrium magnetic field lines. A model for these magnetohydrodynamic modes in a low-β, three-dimensional stellarator equilibria has been developed. A set of helical current filaments are constrained to mimic the structure of magnetic field lines on rational surfaces derived from three-dimensional (3D) equilibrium reconstructions. Transformation to straight field line coordinates then allows fitting of the poloidal magnetic sensor data to a single harmonic function, which fixes the modeled toroidal mode structure via the field line flow geometry. The developed procedure accurately captures phase and amplitude variation for m/n = 3/2, 3/1, and 4/1 modes in the 3D equilibria of the compact toroidal hybrid experiment. |
| doi_str_mv | 10.1063/5.0061806 |
| format | Article |
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D. ; Ennis, D. A. ; Hanson, J. D. ; Hartwell, G. J. ; Maurer, D. A.</creator><creatorcontrib>Pandya, M. D. ; Ennis, D. A. ; Hanson, J. D. ; Hartwell, G. J. ; Maurer, D. A.</creatorcontrib><description>Magnetic field fluctuations are observed in current-carrying stellarator plasmas when the rotational transform is close to a rational value at the edge of the plasma. At low plasma pressure, these fluctuations are associated with perturbed currents parallel to the equilibrium magnetic field lines. A model for these magnetohydrodynamic modes in a low-β, three-dimensional stellarator equilibria has been developed. A set of helical current filaments are constrained to mimic the structure of magnetic field lines on rational surfaces derived from three-dimensional (3D) equilibrium reconstructions. Transformation to straight field line coordinates then allows fitting of the poloidal magnetic sensor data to a single harmonic function, which fixes the modeled toroidal mode structure via the field line flow geometry. The developed procedure accurately captures phase and amplitude variation for m/n = 3/2, 3/1, and 4/1 modes in the 3D equilibria of the compact toroidal hybrid experiment.</description><identifier>ISSN: 1070-664X</identifier><identifier>EISSN: 1089-7674</identifier><identifier>DOI: 10.1063/5.0061806</identifier><identifier>CODEN: PHPAEN</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>Filaments ; Flow geometry ; Fluid flow ; Harmonic functions ; Magnetic fields ; Magnetic structure ; Magnetism ; Magnetohydrodynamics ; Plasma physics ; Plasma pressure ; Plasmas (physics)</subject><ispartof>Physics of plasmas, 2021-11, Vol.28 (11)</ispartof><rights>Author(s)</rights><rights>2021 Author(s). 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Transformation to straight field line coordinates then allows fitting of the poloidal magnetic sensor data to a single harmonic function, which fixes the modeled toroidal mode structure via the field line flow geometry. The developed procedure accurately captures phase and amplitude variation for m/n = 3/2, 3/1, and 4/1 modes in the 3D equilibria of the compact toroidal hybrid experiment.</description><subject>Filaments</subject><subject>Flow geometry</subject><subject>Fluid flow</subject><subject>Harmonic functions</subject><subject>Magnetic fields</subject><subject>Magnetic structure</subject><subject>Magnetism</subject><subject>Magnetohydrodynamics</subject><subject>Plasma physics</subject><subject>Plasma pressure</subject><subject>Plasmas (physics)</subject><issn>1070-664X</issn><issn>1089-7674</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNqd0D1PwzAQBuAIgUQpDPyDCCaQUvwRO_aIKr6kSixFYrNc55KmJHaxnaL8e1K1EjvT3fDce6dLkmuMZhhx-sBmCHEsED9JJhgJmRW8yE_3fYEyzvPP8-QihA1CKOdMTJKv5RrSTtcWYmPSEH1vYu8hdVXaOltnP3oHLdg6ro_KrYfSu3KwuhsHOldCSBubmt57sDEz2vuhsfUYBW2rvY7Op9tWh06Hy-Ss0m2Aq2OdJh_PT8v5a7Z4f3mbPy4yQ4WMWcU0gMQlH09muiCUUVphAFhRmQtNKZOIGIMoIVoUopSYUlxAvhLFilWY0Glyc8h1ITYqmCaCWRtnLZiosCBCEDmi2wPaevfdQ4hq43pvx7sUYZJwyXiej-ruoIx3IXio1NY3nfaDwkjtH66YOj58tPcHu9-oY-Ps__DO-T-otmVFfwHiAI_E</recordid><startdate>20211101</startdate><enddate>20211101</enddate><creator>Pandya, M. 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Transformation to straight field line coordinates then allows fitting of the poloidal magnetic sensor data to a single harmonic function, which fixes the modeled toroidal mode structure via the field line flow geometry. 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| subjects | Filaments Flow geometry Fluid flow Harmonic functions Magnetic fields Magnetic structure Magnetism Magnetohydrodynamics Plasma physics Plasma pressure Plasmas (physics) |
| title | The magnetic structure of long-wavelength magnetohydrodynamic modes in current-carrying stellarator plasmas |
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