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**Harvard**

Sabbagh, S., Sontag, A., Bialek, J., Gates, D., Glasser, A., Menard, J., Zhu, W., Bell, M., Bell, R., Bondeson, A., Bush, C., Callen, J., Chu, M., Hegna, C., Kaye, S., Lao, L., LeBlanc, B., Liu, Y., Maingi, R., Mueller, D., Shaing, K., Stutman, D., Tritz, K. och Zhang, C. (2006) *Resistive wall stabilized operation in rotating high beta NSTX plasmas*.

** BibTeX **

@article{

Sabbagh2006,

author={Sabbagh, S. A. and Sontag, A. C. and Bialek, J. M. and Gates, D. A. and Glasser, A. H. and Menard, J. E. and Zhu, W. and Bell, M. G. and Bell, R. E. and Bondeson, Anders and Bush, C. E. and Callen, J. D. and Chu, M. S. and Hegna, C. C. and Kaye, S. M. and Lao, L. L. and LeBlanc, B. P. and Liu, Y. Q. and Maingi, R. and Mueller, D. and Shaing, K. C. and Stutman, D. and Tritz, K. and Zhang, C.},

title={Resistive wall stabilized operation in rotating high beta NSTX plasmas},

journal={Nuclear Fusion},

issn={00295515},

volume={46},

issue={5},

pages={635-644},

abstract={The National Spherical Torus Experiment (NSTX) has demonstrated the advantages of low aspect ratio geometry in accessing high toroidal and normalized plasma beta, and βN ≡ 10 8〈βt〉 aB0/Ip. Experiments have reached βt = 39% and βN = 7.2 through boundary and profile optimization. High βN plasmas can exceed the ideal no-wall stability limit, βNno-wall, for periods much greater than the wall eddy current decay time. Resistive wall mode (RWM) physics is studied to understand mode stabilization in these plasmas. The toroidal mode spectrum of unstable RWMs has been measured with mode number n up to 3. The critical rotation frequency of Bondeson-Chu, Ωcrit = ωA/(4q2), describes well the RWM stability of NSTX plasmas when applied over the entire rotation profile and in conjunction with the ideal stability criterion. Rotation damping and global rotation collapse observed in plasmas exceeding βNno-wall differs from the damping observed during tearing mode activity and can be described qualitatively by drag due to neoclassical toroidal viscosity in the helically perturbed field of an ideal displacement. Resonant field amplification of an applied n = 1 field perturbation has been measured and increases with increasing βN. Equilibria are reconstructed including measured ion and electron pressure, toroidal rotation and flux isotherm constraint in plasmas with core rotation ω/ωA up to 0.48. Peak pressure shifts of 18% of the minor radius from the magnetic axis have been reconstructed. },

year={2006},

}

** RefWorks **

RT Journal Article

SR Electronic

ID 102924

A1 Sabbagh, S. A.

A1 Sontag, A. C.

A1 Bialek, J. M.

A1 Gates, D. A.

A1 Glasser, A. H.

A1 Menard, J. E.

A1 Zhu, W.

A1 Bell, M. G.

A1 Bell, R. E.

A1 Bondeson, Anders

A1 Bush, C. E.

A1 Callen, J. D.

A1 Chu, M. S.

A1 Hegna, C. C.

A1 Kaye, S. M.

A1 Lao, L. L.

A1 LeBlanc, B. P.

A1 Liu, Y. Q.

A1 Maingi, R.

A1 Mueller, D.

A1 Shaing, K. C.

A1 Stutman, D.

A1 Tritz, K.

A1 Zhang, C.

T1 Resistive wall stabilized operation in rotating high beta NSTX plasmas

YR 2006

JF Nuclear Fusion

SN 00295515

VO 46

IS 5

SP 635

OP 644

AB The National Spherical Torus Experiment (NSTX) has demonstrated the advantages of low aspect ratio geometry in accessing high toroidal and normalized plasma beta, and βN ≡ 10 8〈βt〉 aB0/Ip. Experiments have reached βt = 39% and βN = 7.2 through boundary and profile optimization. High βN plasmas can exceed the ideal no-wall stability limit, βNno-wall, for periods much greater than the wall eddy current decay time. Resistive wall mode (RWM) physics is studied to understand mode stabilization in these plasmas. The toroidal mode spectrum of unstable RWMs has been measured with mode number n up to 3. The critical rotation frequency of Bondeson-Chu, Ωcrit = ωA/(4q2), describes well the RWM stability of NSTX plasmas when applied over the entire rotation profile and in conjunction with the ideal stability criterion. Rotation damping and global rotation collapse observed in plasmas exceeding βNno-wall differs from the damping observed during tearing mode activity and can be described qualitatively by drag due to neoclassical toroidal viscosity in the helically perturbed field of an ideal displacement. Resonant field amplification of an applied n = 1 field perturbation has been measured and increases with increasing βN. Equilibria are reconstructed including measured ion and electron pressure, toroidal rotation and flux isotherm constraint in plasmas with core rotation ω/ωA up to 0.48. Peak pressure shifts of 18% of the minor radius from the magnetic axis have been reconstructed.

LA eng

DO 10.1088/0029-5515/46/5/014

LK http://dx.doi.org/10.1088/0029-5515/46/5/014

OL 30