Recent progress toward an advanced spherical torus operating point in NSTX

Gates, D. A.; Kaye, S.; Maingi, R.; Menard, J. E.; Sabbagh, S. A.; Soukhanovskii, V.; Bell, M. G.; Bell, R. E.; Canik, J. M.; Fredrickson, E.; Kaita, R.; Kolemen, E.; Kugel, H.; Le Blanc, B. P.; Mastrovito, D.; Mueller, D.; Yuh, H.

doi:10.1088/0029-5515/51/7/073031

Title: Recent progress toward an advanced spherical torus operating point in NSTX

Journal Article · Fri May 13 00:00:00 EDT 2011 · Nuclear Fusion

DOI:https://doi.org/10.1088/0029-5515/51/7/073031· OSTI ID:1266680

Gates, D. A. ^[1]; Kaye, S. ^[1]; Maingi, R. ^[2]; Menard, J. E. ^[1]; Sabbagh, S. A. ^[3]; Soukhanovskii, V. ^[4]; Bell, M. G. ^[1]; Bell, R. E. ^[1]; Canik, J. M. ^[3]; Fredrickson, E. ^[1]; Kaita, R. ^[1]; Kolemen, E. ^[1]; Kugel, H. ^[1]; Le Blanc, B. P. ^[1]; Mastrovito, D. ^[1]; Mueller, D. ^[1]; Yuh, H. ^[5]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Columbia Univ., New York, NY (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Nova Photonics, Princeton, NJ (United States)

Progress in the development of integrated advanced ST plasma scenarios in NSTX (Ono et al., 2000 Nucl. Fusion 40 557) is reported. Recent high-performance plasmas in NSTX following lithium coating of the plasma facing surfaces have achieved higher elongation and lower internal inductance than previously. Analysis of the thermal confinement in these lithiumized discharges shows a stronger plasma current and weaker toroidal field dependence than in previous ST confinement scaling studies; the ITER-98(y, 2) scaling expression describes these scenarios reasonably well. Analysis during periods free of MHD activity has shown that the reconstructed current profile can be understood as the sum of pressure driven, inductive and neutral beam driven currents, without requiring any anomalous fast-ion transport. Non-inductive fractions of 65–70%, and βP > 2, have been achieved at lower plasma current. Some of these low-inductance discharges have a significantly reduced no-wall βN limit, and often have βN at or near the with-wall limit. Coupled m/n = 1/1 + 2/1 kink/tearing modes can limit the sustained β values when rapidly growing ideal modes are avoided. A βN controller has been commissioned and utilized in sustaining high-performance plasmas. 'Snowflake' divertors compatible with high-performance plasmas have been developed. Scenarios with significantly larger aspect ratios have also been developed, in support of next-step ST devices. Furthermore, these NSTX plasmas have many characteristics required for next-step ST devices.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1266680

Report Number(s):: LLNL-JRNL-465266

Journal Information:: Nuclear Fusion, Vol. 51, Issue 7; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 42 works

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Scaling of linear microtearing stability for a high collisionality National Spherical Torus Experiment discharge Guttenfelder, W.; Candy, J.; Kaye, S. M. Physics of Plasmas, Vol. 19, Issue 2 https://doi.org/10.1063/1.3685698	journal	February 2012
Simulation of non-resonant internal kink mode with toroidal rotation in the National Spherical Torus Experiment Wang, Feng; Fu, G. Y.; Breslau, J. A. Physics of Plasmas, Vol. 20, Issue 7 https://doi.org/10.1063/1.4816026	journal	July 2013
Simultaneous feedback control of plasma rotation and stored energy on NSTX-U using neoclassical toroidal viscosity and neutral beam injection Goumiri, I. R.; Rowley, C. W.; Sabbagh, S. A. Physics of Plasmas, Vol. 24, Issue 5 https://doi.org/10.1063/1.4976853	journal	May 2017
Spherical tokamaks with a high current carrying plasma center column Lampugnani, L. G.; Garcia-Martinez, P. L.; Farengo, R. Physics of Plasmas, Vol. 25, Issue 12 https://doi.org/10.1063/1.5066221	journal	December 2018

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