Development and validation of a critical gradient energetic particle driven Alfven eigenmode transport model for DIII-D tilted neutral beam experiments

Waltz, Ronald E.; Bass, Eric M.; Heidbrink, William W.; VanZeeland, Michael A.

doi:10.1088/0029-5515/55/12/123012

Title: Development and validation of a critical gradient energetic particle driven Alfven eigenmode transport model for DIII-D tilted neutral beam experiments

Journal Article · Fri Oct 30 00:00:00 EDT 2015 · Nuclear Fusion

DOI:https://doi.org/10.1088/0029-5515/55/12/123012· OSTI ID:1352905

Waltz, Ronald E. ^[1]; Bass, Eric M. ^[2]; Heidbrink, William W. ^[3]; VanZeeland, Michael A. ^[1]

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

Recent experiments with the DIII-D tilted neutral beam injection (NBI) varying the beam energetic particle (EP) source profiles have provided strong evidence that unstable Alfven eigenmodes (AE) drive stiff EP transport at a critical EP density gradient. Here the critical gradient is identified by the local AE growth rate being equal to the local ITG/TEM growth rate at the same low toroidal mode number. The growth rates are taken from the gyrokinetic code GYRO. Simulation show that the slowing down beam-like EP distribution has a slightly lower critical gradient than the Maxwellian. The ALPHA EP density transport code, used to validate the model, combines the low-n stiff EP critical density gradient AE mid-core transport with the energy independent high-n ITG/TEM density transport model controling the central core EP density profile. For the on-axis NBI heated DIII-D shot 146102, while the net loss to the edge is small, about half the birth fast ions are transported from the central core r/a < 0.5 and the central density is about half the slowing down density. Lastly, these results are in good agreement with experimental fast ion pressure profiles inferred from MSE constrained EFIT equilibria.

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

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: FC02-04ER54698; FC02-08ER54977; FG02-95ER54309

OSTI ID:: 1352905

Alternate ID(s):: OSTI ID: 1238865

Journal Information:: Nuclear Fusion, Vol. 55, Issue 12; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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References (18)

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Cited By (9)

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Integrated Tokamak modeling: When physics informs engineering and research planning Poli, Francesca Maria Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5021489	journal	May 2018
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A measure of fast ion beta at marginal stability in the reversed field pinch Capecchi, W.; Anderson, J. K.; Bonofiglo, P. J. Nuclear Fusion, Vol. 59, Issue 8 https://doi.org/10.1088/1741-4326/ab2473	journal	June 2019
Alfvén eigenmodes and fast ion transport in negative triangularity DIII-D plasmas Van Zeeland, M. A.; Collins, C. S.; Heidbrink, W. W. Nuclear Fusion, Vol. 59, Issue 8 https://doi.org/10.1088/1741-4326/ab2488	journal	June 2019
Critical energetic particle distribution in phase space for the Alfvén eigenmode burst with global resonance overlap Todo, Y. Nuclear Fusion, Vol. 59, Issue 9 https://doi.org/10.1088/1741-4326/ab2fff	journal	August 2019
Reduced energetic particle transport models enable comprehensive time-dependent tokamak simulations Podestà, M.; Bardóczi, L.; Collins, C. S. Nuclear Fusion, Vol. 59, Issue 10 https://doi.org/10.1088/1741-4326/ab3112	journal	August 2019
Prediction of Alfvén eigenmode energetic particle transport in ITER scenarios with a critical gradient model Bass, E. M.; Waltz, R. E. Nuclear Fusion, Vol. 60, Issue 1 https://doi.org/10.1088/1741-4326/ab54fb	journal	December 2019

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Title: Development and validation of a critical gradient energetic particle driven Alfven eigenmode transport model for DIII-D tilted neutral beam experiments

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