Investigation of resistive wall mode stabilization physics in high-beta plasmas using applied non-axisymmetric fields in NSTX

A. C. Sontag; S. A. Sabbagh; W. Zhu; J. E. Menard; R. E. Bell; J. M. Bialek; M. G. Bell; D. A. Gates; A. H. Glasser; B. P. Leblanc; K. C. Shaing; D. Stutman; K. L. Tritz

doi:10.1088/0029-5515/47/8/035

Investigation of resistive wall mode stabilization physics in high-beta plasmas using applied non-axisymmetric fields in NSTX

A. C. Sontag, S. A. Sabbagh, W. Zhu, J. E. Menard, R. E. Bell, J. M. Bialek, M. G. Bell, D. A. Gates, A. H. Glasser, B. P. Leblanc, K. C. Shaing, D. Stutman, K. L. Tritz

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Abstract

The National Spherical Torus Experiment (NSTX) offers an operational space characterized by high-beta (β_t ≤ 39%, β_N > 7, ) and low aspect ratio (A > 1.27) to leverage the plasma parameter dependences of RWM stabilization and plasma rotation damping physics giving greater confidence for extrapolation to ITER. Significant new capability for RWM research has been added to the device with the commissioning of a set of six non-axisymmetric magnetic field coils, allowing generation of fields with dominant toroidal mode number, n, of 1-3. These coils have been used to study the dependence of resonant field amplification on applied field frequency and RWM stabilization physics by reducing the toroidal rotation profile below its steady-state value through non-resonant magnetic braking. Modification of plasma rotation profiles shows that rotation outside q ≤ 2.5 is not required for passive RWM stability and there is large variation in the RWM critical rotation at the q ≤ 2 surface, both of which are consistent with distributed dissipation models.

Original language	English (US)
Article number	035
Pages (from-to)	1005-1011
Number of pages	7
Journal	Nuclear Fusion
Volume	47
Issue number	8
DOIs	https://doi.org/10.1088/0029-5515/47/8/035
State	Published - Aug 1 2007

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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Sontag, A. C., Sabbagh, S. A., Zhu, W., Menard, J. E., Bell, R. E., Bialek, J. M., Bell, M. G., Gates, D. A., Glasser, A. H., Leblanc, B. P., Shaing, K. C., Stutman, D., & Tritz, K. L. (2007). Investigation of resistive wall mode stabilization physics in high-beta plasmas using applied non-axisymmetric fields in NSTX. Nuclear Fusion, 47(8), 1005-1011. Article 035. https://doi.org/10.1088/0029-5515/47/8/035

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title = "Investigation of resistive wall mode stabilization physics in high-beta plasmas using applied non-axisymmetric fields in NSTX",

abstract = "The National Spherical Torus Experiment (NSTX) offers an operational space characterized by high-beta (βt ≤ 39\%, βN > 7, ) and low aspect ratio (A > 1.27) to leverage the plasma parameter dependences of RWM stabilization and plasma rotation damping physics giving greater confidence for extrapolation to ITER. Significant new capability for RWM research has been added to the device with the commissioning of a set of six non-axisymmetric magnetic field coils, allowing generation of fields with dominant toroidal mode number, n, of 1-3. These coils have been used to study the dependence of resonant field amplification on applied field frequency and RWM stabilization physics by reducing the toroidal rotation profile below its steady-state value through non-resonant magnetic braking. Modification of plasma rotation profiles shows that rotation outside q ≤ 2.5 is not required for passive RWM stability and there is large variation in the RWM critical rotation at the q ≤ 2 surface, both of which are consistent with distributed dissipation models.",

author = "Sontag, \{A. C.\} and Sabbagh, \{S. A.\} and W. Zhu and Menard, \{J. E.\} and Bell, \{R. E.\} and Bialek, \{J. M.\} and Bell, \{M. G.\} and Gates, \{D. A.\} and Glasser, \{A. H.\} and Leblanc, \{B. P.\} and Shaing, \{K. C.\} and D. Stutman and Tritz, \{K. L.\}",

year = "2007",

month = aug,

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doi = "10.1088/0029-5515/47/8/035",

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Sontag, AC, Sabbagh, SA, Zhu, W, Menard, JE, Bell, RE, Bialek, JM, Bell, MG, Gates, DA, Glasser, AH, Leblanc, BP, Shaing, KC, Stutman, D & Tritz, KL 2007, 'Investigation of resistive wall mode stabilization physics in high-beta plasmas using applied non-axisymmetric fields in NSTX', Nuclear Fusion, vol. 47, no. 8, 035, pp. 1005-1011. https://doi.org/10.1088/0029-5515/47/8/035

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AU - Sontag, A. C.

AU - Sabbagh, S. A.

AU - Zhu, W.

AU - Menard, J. E.

AU - Bell, R. E.

AU - Bialek, J. M.

AU - Bell, M. G.

AU - Gates, D. A.

AU - Glasser, A. H.

AU - Leblanc, B. P.

AU - Shaing, K. C.

AU - Stutman, D.

AU - Tritz, K. L.

PY - 2007/8/1

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N2 - The National Spherical Torus Experiment (NSTX) offers an operational space characterized by high-beta (βt ≤ 39%, βN > 7, ) and low aspect ratio (A > 1.27) to leverage the plasma parameter dependences of RWM stabilization and plasma rotation damping physics giving greater confidence for extrapolation to ITER. Significant new capability for RWM research has been added to the device with the commissioning of a set of six non-axisymmetric magnetic field coils, allowing generation of fields with dominant toroidal mode number, n, of 1-3. These coils have been used to study the dependence of resonant field amplification on applied field frequency and RWM stabilization physics by reducing the toroidal rotation profile below its steady-state value through non-resonant magnetic braking. Modification of plasma rotation profiles shows that rotation outside q ≤ 2.5 is not required for passive RWM stability and there is large variation in the RWM critical rotation at the q ≤ 2 surface, both of which are consistent with distributed dissipation models.

AB - The National Spherical Torus Experiment (NSTX) offers an operational space characterized by high-beta (βt ≤ 39%, βN > 7, ) and low aspect ratio (A > 1.27) to leverage the plasma parameter dependences of RWM stabilization and plasma rotation damping physics giving greater confidence for extrapolation to ITER. Significant new capability for RWM research has been added to the device with the commissioning of a set of six non-axisymmetric magnetic field coils, allowing generation of fields with dominant toroidal mode number, n, of 1-3. These coils have been used to study the dependence of resonant field amplification on applied field frequency and RWM stabilization physics by reducing the toroidal rotation profile below its steady-state value through non-resonant magnetic braking. Modification of plasma rotation profiles shows that rotation outside q ≤ 2.5 is not required for passive RWM stability and there is large variation in the RWM critical rotation at the q ≤ 2 surface, both of which are consistent with distributed dissipation models.

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Investigation of resistive wall mode stabilization physics in high-beta plasmas using applied non-axisymmetric fields in NSTX

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