Internal magnetic field structure and parallel electric field profile evolution during the sawtooth cycle in MST

B. H. Deng; W. X. Ding; D. L. Brower; A. F. Almagri; K. J. McCollam; Y. Ren; S. C. Prager; J. S. Sarff; J. Reusch; J. K. Anderson

doi:10.1088/0741-3335/50/11/115013

Internal magnetic field structure and parallel electric field profile evolution during the sawtooth cycle in MST

B. H. Deng, W. X. Ding, D. L. Brower, A. F. Almagri, K. J. McCollam, Y. Ren, S. C. Prager, J. S. Sarff, J. Reusch, J. K. Anderson

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5 Scopus citations

Abstract

Temporal dynamics of the magnetic field, parallel current density, parallel electric field and safety factor profiles in the core of a high-temperature reversed-field pinch plasma are experimentally resolved. Measurements are realized using a high-speed polarimeter-interferometer diagnostic which is employed to simultaneously determine the electron density, toroidal current density and poloidal magnetic field profiles. Combined with external magnetic measurements, these data allow determination of the equilibrium profile dynamics during individual sawtooth magnetic relaxation events. At the sawtooth crash, the E_∥ profile has a large positive peak on-axis, and a negative peak of slightly smaller value near the reversal surface demonstrating the need for a dynamo to sustain the plasma equilibrium.

Original language	English (US)
Article number	115013
Journal	Plasma Physics and Controlled Fusion
Volume	50
Issue number	11
DOIs	https://doi.org/10.1088/0741-3335/50/11/115013
State	Published - Nov 1 2008

All Science Journal Classification (ASJC) codes

Nuclear Energy and Engineering
Condensed Matter Physics

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10.1088/0741-3335/50/11/115013

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Deng, B. H., Ding, W. X., Brower, D. L., Almagri, A. F., McCollam, K. J., Ren, Y., Prager, S. C., Sarff, J. S., Reusch, J., & Anderson, J. K. (2008). Internal magnetic field structure and parallel electric field profile evolution during the sawtooth cycle in MST. Plasma Physics and Controlled Fusion, 50(11), Article 115013. https://doi.org/10.1088/0741-3335/50/11/115013

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abstract = "Temporal dynamics of the magnetic field, parallel current density, parallel electric field and safety factor profiles in the core of a high-temperature reversed-field pinch plasma are experimentally resolved. Measurements are realized using a high-speed polarimeter-interferometer diagnostic which is employed to simultaneously determine the electron density, toroidal current density and poloidal magnetic field profiles. Combined with external magnetic measurements, these data allow determination of the equilibrium profile dynamics during individual sawtooth magnetic relaxation events. At the sawtooth crash, the E∥ profile has a large positive peak on-axis, and a negative peak of slightly smaller value near the reversal surface demonstrating the need for a dynamo to sustain the plasma equilibrium.",

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AU - Brower, D. L.

AU - Almagri, A. F.

AU - McCollam, K. J.

AU - Ren, Y.

AU - Prager, S. C.

AU - Sarff, J. S.

AU - Reusch, J.

AU - Anderson, J. K.

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AB - Temporal dynamics of the magnetic field, parallel current density, parallel electric field and safety factor profiles in the core of a high-temperature reversed-field pinch plasma are experimentally resolved. Measurements are realized using a high-speed polarimeter-interferometer diagnostic which is employed to simultaneously determine the electron density, toroidal current density and poloidal magnetic field profiles. Combined with external magnetic measurements, these data allow determination of the equilibrium profile dynamics during individual sawtooth magnetic relaxation events. At the sawtooth crash, the E∥ profile has a large positive peak on-axis, and a negative peak of slightly smaller value near the reversal surface demonstrating the need for a dynamo to sustain the plasma equilibrium.

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Internal magnetic field structure and parallel electric field profile evolution during the sawtooth cycle in MST

Abstract

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