Study of the likelihood of Alfvénic mode bifurcation in NSTX and predictions for ITER baseline scenarios

Duarte, V. N.; Gorelenkov, N. N.; Schneller, M.; Fredrickson, E. D.; Podesta, M.; Berk, H. L.

doi:10.1088/1741-4326/aab37c

Title: Study of the likelihood of Alfvénic mode bifurcation in NSTX and predictions for ITER baseline scenarios

Journal Article · 01 March 2018 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/aab37c · OSTI ID:1459542

^[1]; Gorelenkov, N. N. ^[2]; Schneller, M. ^[2]; Fredrickson, E. D. ^[2];

^[2]; Berk, H. L. ^[3]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Univ. of São Paulo (Brazil). Inst. of Physics
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Univ. of Texas, Austin, TX (United States). Inst. for Fusion Studies

Rare Alfvénic wave transitions between fixed-frequency and chirping phases are identified in NSTX, where Alfvénic waves are normally observed to exhibit either chirping or avalanching responses. For those transitions, we apply in this paper a criterion (Duarte et al 2017 Nucl. Fusion 57 054001) to predict the nature of fast ion redistribution in tokamaks to be in the convective or diffusive nonlinear regimes. For NSTX discharges in which the transition is not accompanied by changes in the beam deposited power or modifications in the injected radiofrequency power, it has been found that the anomalous fast ion transport is a likely mediator of the bifurcation between the fixed-frequency mode behavior and rapid chirping. For a quantitative assessment, global gyrokinetic simulations of the effects of electrostatic ion temperature gradient turbulence and trapped electron mode turbulence on chirping were pursued using the GTS code. The investigation is extended by means of predictive studies of the probable spectral behavior of Alfvénic eigenmodes for baseline ITER cases consisting of elmy, advanced and hybrid scenarios. Finally, it has been observed that most modes are found to be borderline between the steady and the chirping phases.

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Research Organization:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Univ. of São Paulo (Brazil)

Sponsoring Organization:: USDOE; São Paulo Research Foundation (FAPESP) (Brazil)

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 1459542

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 8 Vol. 58; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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