Y. Liu S.A. Sabbagh I.T. Chapman S. Gerasimov Y. Gribov T.C. Hender V. Igochine M. Maraschek G. Matsunag M. Okabayashi E.J. Strait
The high-frequency noise measured by magnetic sensors, at levels above the typical frequency of resistive wall modes, is analyzed across a range of present tokamak devices including DIII-D, JET, MAST, ASDEX Upgrade, JT-60U, and NSTX. A high-pass filter enables identification of the noise component with Gaussian-like statistics that shares certain c…
Preprint PurchaseJ.D. King E.J. Strait N.M. Ferraro J.M. Hanson S.R. Haskey M.J. Lanctot Y.Q. Liu N.Logan C. Paz-Soldan D. Shiraki A.D. Turnbull
Detailed measurements of the plasmas response to applied magnetic perturbations provide experimental evidence that the form of three-dimensional (3D) tokamak equilibria, with toroidal mode number n = 1, is determined by multiple stable kink modes at high-pressure. For pressures greater than the ideal magnetohydrodynamic (MHD) stability limit, as …
Preprint PublishedYueqiang Liu I. T. Chapman J. P. Graves G. Z. Hao Z. R. Wang J. E. Menard M. Okabayashi E. J. Strait A. Turnbull
A non-perturbative magnetohydrodynamic-kinetic hybrid formulation is developed and implemented into the MARS-K code [Liu et al., Phys. Plasmas 15, 112503 (2008)] that takes into account the anisotropy and asymmetry [Graves et al., Nature Commun. 3, 624 (2012)] of the equilibrium distribution of energetic particles (EPs) in particle pitch angle spac…
PublishedM. Okabayashi G. Matsunaga J.S. Degrassie W.W. Heidbrink Y. In Y.Q. Liu H. Reimerdes W.M. Solomon E.J. Strait M. Takechi N. Asakura R.V. Budny G.L. Jackson J.M. Hanson R. J. La Haye M.J. Lanctot J. Manickam K. Shinohara Y.B. Zhu
An energetic-particle (EP)-driven “off-axis-fishbone-like mode (OFM)” often triggers a resistive wall mode (RWM) in JT-60U and DIII-D devices, preventing long-duration high-b N discharges. In these experiments, the EPs are energetic ions (70–85 keV) injected by neutral beams to produce high-pressure plasmas. EP-driven bursting events reduce t…
PublishedM.J. Lanctot H. Reimerdes A.M. Garofalo M.S. Chu J. M. Hanson Y.Q. Liu G.A. Navratil I.N. Bogatu Y. In G.L. Jackson R.J. La Haye M. Okayabashi J.-K. Park M.J. Schaffer O. Schmitz E.J. Strait A.D. Turnbull
A detailed experiment-theory comparison reveals that linear ideal MHD theory is in quantitative agreement with external magnetic and internal soft x-ray measurements of the plasma response to externally applied non-axisymmetric fields over a broad range of beta and rotation. This result represents a significant step toward the goal of advancing the…
PublishedYueqiang Liu I. T. Chapman, M. S. Chu, H. Reimerdes, F. Villone, R. Albanese, G. Ambrosino, A. M. Garofalo, C. G. Gimblett, R. J. Hastie, T. C. Hender, G. L. Jackson, R. J. La Haye, M. Okabayashi, A. Pironti, A. Portone, G. Rubinacci and E. J. Strait
Self-consistent computations are carried out to study the stability of the resistive wall mode RWM in DIII-D J. L. Luxon, Nucl. Fusion 42 , 614 2002 plasmas with slow plasma rotation, using the hybrid kinetic-magnetohydrodynamic code MARS-K [Y. Q. Liu and et al. , Phys. Plasmas 15 , 112503 (2008)]. Based on kinetic resonances between the mode and t…
PublishedR. J. Buttery R. J. La Haye P. Gohil G. L. Jackson H. Reimerdes E. J. Strait The Diii-D Team
Utilizing a capability to vary neutral beam torque injection in the DIII-D [J. L. Luxon, Nucl. Fusion 42 , 614 (2002)] tokamak, m / n =2/1 neoclassical tearing mode onset thresholds are found to fall by about one unit in βN , from 3 to 2, in ITER-like sawtoothing high-energy confinement modes of plasma operation [R. Aymar, Plasma Phys. Control. Fu…
PublishedH. Reimerdes T. C. Hender S. A. Sabbagh J. M. Bialek M. S. Chu A. M. Garofalo M. P. Gryaznevich D. F. Howell G. L. Jackson R. J. La Haye Y. Q. Liu J. E. Menard G. A. Navratil M. Okabayashi S. D. Pinches A. C. Sontag E. J. Strait W. Zhu M
Dedicated experiments in the DIII-D tokamak J. L. Luxon, Nucl. Fusion, 42 , 614 2002, the Joint European Torus JET P. H. Rebut, R. J. Bickerton, and B. E. Keen, Nucl. Fusion 25 , 1011 1985, and the National Spherical Torus Experiment NSTX M. Ono, S. M. Kaye, Y.-K. M. Peng et al. , Nucl. Fusion 40 , 557 2000 reveal the commonalities of resistive wal…
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