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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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 languageEnglish (US)
Article number115013
JournalPlasma Physics and Controlled Fusion
Volume50
Issue number11
DOIs
StatePublished - Nov 1 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

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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), [115013]. https://doi.org/10.1088/0741-3335/50/11/115013