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  • Sabbagh, S. A.Columbia University in the City of New York (author)

Resistive wall stabilized operation in rotating high beta NSTX plasmas

  • Article/chapterEnglish2006

Publisher, publication year, extent ...

  • 2006-04-28
  • IOP Publishing,2006

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:68705424-322f-49f1-95ce-f7b31f0abe2f
  • https://doi.org/10.1088/0029-5515/46/5/014DOI
  • https://research.chalmers.se/publication/102924URI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • 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.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Sontag, A. C.Columbia University in the City of New York (author)
  • Bialek, J.Columbia University in the City of New York (author)
  • Gates, D. A.Princeton University (author)
  • Glasser, A. H.Los Alamos National Laboratory (author)
  • Menard, J.Princeton University (author)
  • Zhu, W.Columbia University in the City of New York (author)
  • Bell, M. G.Princeton University (author)
  • Bell, R. E.Princeton University (author)
  • Bondeson, Anders,1953Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)elfab (author)
  • Bush, C. E.Oak Ridge National Laboratory (author)
  • Callen, J. D.University of Wisconsin Madison (author)
  • Chu, M. S.General Atomics (author)
  • Hegna, C. C.University of Wisconsin Madison (author)
  • Kaye, S. M.Princeton University (author)
  • Lao, L. L.General Atomics (author)
  • LeBlanc, B. P.Princeton University (author)
  • Liu, Yueqiang,1971Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)elfliu (author)
  • Maingi, R.Oak Ridge National Laboratory (author)
  • Mueller, D.Princeton University (author)
  • Shaing, K. C.University of Wisconsin Madison (author)
  • Stutman, D.Johns Hopkins University (author)
  • Tritz, K.Johns Hopkins University (author)
  • Zhang, C.Chinese Academy of Sciences(Swepub:cth)chengz (author)
  • Columbia University in the City of New YorkPrinceton University (creator_code:org_t)

Related titles

  • In:Nuclear Fusion: IOP Publishing46:5, s. 635-6441741-43260029-5515

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