Validating predictive models for fast ion profile relaxation in burning plasmas

Gorelenkov, N. N.; Heidbrink, W. W.; Kramer, G. J.; Lestz, J. B.; Podesta, M.; Van Zeeland, M. A.; White, R. B.

doi:10.1088/0029-5515/56/11/112015

Title: Validating predictive models for fast ion profile relaxation in burning plasmas

Journal Article · Fri Jul 22 00:00:00 EDT 2016 · Nuclear Fusion

DOI:https://doi.org/10.1088/0029-5515/56/11/112015· OSTI ID:1343555

Gorelenkov, N. N. ^[1]; Heidbrink, W. W. ^[2];

^[1];

^[1]; Van Zeeland, M. A. ^[3];

^[1]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Univ. of California, Irvine, CA (United States)
General Atomics, San Diego, CA (United States)

The redistribution and potential loss of energetic particles due to MHD modes can limit the performance of fusion plasmas by reducing the plasma heating rate. In this work, we present validation studies of the 1.5D critical gradient model (CGM) for Alfven eigenmode (AE) induced EP transport in NSTX and DIII-D neutral beam heated plasmas. In previous comparisons with a single DIII-D L-mode case, the CGM model was found to be responsible for 75% of measured AE induced neutron deficit [1]. A fully kinetic HINST is used to compute mode stability for the non-perturbative version of CGM (or nCGM). We have found that AEs show strong local instability drive up to gamma/omega similar to 20% violating assumptions of perturbative approaches used in NOVA-K code. We demonstrate that both models agree with each other and both underestimate the neutron deficit measured in DIII-D shot by approximately a factor of 2. On the other hand in NSTX the application of CGM shows good agreement for the measured flux deficit predictions. We attempt to understand these results with the help of the so-called kick model which is based on the guiding center code ORBIT. The kick model comparison gives important insight into the underlying velocity space dependence of the AE induced EP transport as well as it allows the estimate of the neutron deficit in the presence of the low frequency Alfvenic modes. Within the limitations of used models we infer that there are missing modes in the analysis which could improve the agreement with the experiments.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC02-09CH11466; AC03-99ER54463; FC02-04ER54698; SC-G903402

OSTI ID:: 1343555

Alternate ID(s):: OSTI ID: 1267533; OSTI ID: 1347154

Journal Information:: Nuclear Fusion, Vol. 56, Issue 11; Conference: 14. IAEA Technical Meeting on Energetic Particles in Magnetic Confinement Systems, Vienna (Austria), 1-4 Sep 2015; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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Plasma equilibrium with fast ion orbit width, pressure anisotropy, and toroidal flow effects Gorelenkov, N. N.; Zakharov, L. E. Nuclear Fusion, Vol. 58, Issue 8 https://doi.org/10.1088/1741-4326/aac09d	journal	July 2018
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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

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