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Journal Articles

Empirical scaling of sawtooth period for onset of neoclassical tearing modes

Chapman, I. T.*; Buttery, R. J.*; Coda, S.*; Gerhardt, S.*; Graves, J. P.*; Howell, D. F.*; Isayama, Akihiko; La Haye, R. J.*; Liu, Y.*; Maget, P.*; et al.

Nuclear Fusion, 50(10), p.102001_1 - 102001_7, 2010/10

 Times Cited Count:50 Percentile:87.51(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

TSC modelling of major disruption and VDE events in NSTX and ASDEX-upgrade and predictions for ITER

Bandyopadhyay, I.*; Gerhardt, S.*; Jardin, S.*; Sayer, R. O.*; Nakamura, Yukiharu*; Miyamoto, Seiji; Pautasso, G.*; Sugihara, Masayoshi*; ASDEX Upgrade Team*; NSTX Team*

Proceedings of 23rd IAEA Fusion Energy Conference (FEC 2010) (CD-ROM), 8 Pages, 2010/10

Vertical Displacement Events (VDEs) and Major Disruptions (MDs) of the plasma current will induce large electromagnetic forces on the ITER machine. Estimation of these forces based on accurate modeling of these events is necessary for a robust ITER design. Originally the estimates for electromagnetic forces on ITER were carried out with the help of DINA simulations. However, since simulations of these events may be significantly influenced by model assumptions of a given code it is important to validate the results against other codes like TSC, as also benchmark and update the codes with experimental data. In this paper, we present TSC modeling of the VDE and MD events in NSTX and ASDEX-U devices, which help in improving and validating the models used in the code. The predictive modeling results for ITER with the updated code, including the force predictions, are also presented.

Journal Articles

Investigation of collective fast ion instability-induced redistribution or loss in the National Spherical Torus Experiment

Medley, S. S.*; Andre, R.*; Bell, R. E.*; Darrow, D. S.*; Fredrickson, E. D.*; LeBlanc, B. P.*; Levinton, F. M.*; Menard, J. E.*; Stutman, D.*; Roquemore, A. L.*; et al.

Proceedings of 21st IAEA Fusion Energy Conference (FEC 2006) (CD-ROM), 8 Pages, 2007/03

The National Spherical Torus Experiment (NSTX) is particularly well suited to investigate fast-ion driven instabilities. These instabilities are observed in the wide range of frequency from 0 kHz to the ion cyclotron frequency. Two recently implemented diagnostics on NSTX, the Motional Stark Effect (MSE) and scintillator Fast Lost Ion Probe (sFLIP), facilitate separation of redistribution and loss effects. Outward redistribution of the core-peaked energetic beam ions modifies the beam-driven current profile and hence the core q-profile. For certain H-mode discharges where NPA measurements of the NB energetic ion spectra exhibit MHD-induced fast-ion depletion, the sFLIP data confirm the existence of an ion loss that occurs primarily for passing particles near the NB full injection energy. Observations and TRANSP simulations representing fast ion instability-induced redistribution/loss phenomena in NSTX are presented.

Journal Articles

Characterization of dust collected from NSTX and JT-60U

Sharpe, J. P.*; Humrickhouse, P. W.*; Skinner, C. H.*; NSTX Team; Tanabe, Tetsuo*; Masaki, Kei; Miya, Naoyuki; JT-60 Team; Sagara, Akio*

Journal of Nuclear Materials, 337-339, p.1000 - 1004, 2005/03

 Times Cited Count:42 Percentile:92.29(Materials Science, Multidisciplinary)

no abstracts in English

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