Nonlinear verification of a linear critical gradient model for energetic particle transport by Alfven eigenmodes

Bass, Eric M.; Waltz, R. E.

doi:10.1063/1.4998420

Title: Nonlinear verification of a linear critical gradient model for energetic particle transport by Alfven eigenmodes

Journal Article · Fri Dec 08 00:00:00 EST 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4998420· OSTI ID:1438438

Bass, Eric M. ^[1];

^[2]

Univ. of California, San Diego, CA (United States)
General Atomics, San Diego, CA (United States)

Here, a “stiff transport” critical gradient model of energetic particle (EP) transport by EPdriven Alfven eigenmodes (AEs) is verified against local nonlinear gyrokinetic simulations of a well-studied beam-heated DIII-D discharge 146102. A greatly simplifying linear “recipe” for the limiting EP-density gradient (critical gradient) is considered here. In this recipe, the critical gradient occurs when the AE linear growth rate, driven mainly by the EP gradient, exceeds the ion temperature gradient (ITG) or trapped electron mode (TEM) growth rate, driven by the thermal plasma gradient, at the same toroidal mode number (n) as the AE peak growth, well below the ITG/TEM peak n. This linear recipe for the critical gradient is validated against the critical gradient determined from far more expensive local nonlinear simulations in the gyrokinetic code GYRO, as identified by the point of transport runaway when all driving gradients are held fixed. The reduced linear model is extended to include the stabilization from equilibrium E×B velocity shear. The nonlinear verification unambiguously endorses one of two alternative recipes proposed in Ref. 1: the EP-driven AE growth rate should be determined with rather than without added thermal plasma drive.

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Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: FG02-95ER54309; FC02-08ER54977

OSTI ID:: 1438438

Alternate ID(s):: OSTI ID: 1411993

Journal Information:: Physics of Plasmas, Vol. 24, Issue 12; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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References (19)

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Verification and validation of integrated simulation of energetic particles in fusion plasmas Taimourzadeh, S.; Bass, E. M.; Chen, Y. Nuclear Fusion, Vol. 59, Issue 6 https://doi.org/10.1088/1741-4326/ab0c38	journal	April 2019

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