Improving fast-ion confinement in high-performance discharges by suppressing Alfvén eigenmodes

Kramer, Geritt J.; Podestà, Mario; Holcomb, Christopher; Cui, L.; Gorelenkov, Nikolai N.; Grierson, Brian; Heidbrink, William W.; Nazikian, Raffi. M.; Solomon, Wayne M.; Van Zeeland, Michael A.; Zhu, Yubao

doi:10.1088/1741-4326/aa6456

Title: Improving fast-ion confinement in high-performance discharges by suppressing Alfvén eigenmodes

Journal Article · Tue Mar 28 00:00:00 EDT 2017 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aa6456· OSTI ID:1353401

^[1];

^[1]; Holcomb, Christopher ^[2];

^[1]; Gorelenkov, Nikolai N. ^[1];

^[1]; Heidbrink, William W. ^[3]; Nazikian, Raffi. M. ^[1]; Solomon, Wayne M. ^[4]; Van Zeeland, Michael A. ^[4]; Zhu, Yubao ^[3]

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

Here, we show that the degradation of fast-ion confinement in steady-state DIII-D discharges is quantitatively consistent with predictions based on the effects of multiple unstable Alfven eigenmodes on beam-ion transport. Simulation and experiment show that increasing the radius where the magnetic safety factor has its minimum is effective in minimizing beam-ion transport. This is favorable for achieving high performance steady-state operation in DIII-D and future reactors. A comparison between the experiments and a critical gradient model, in which only equilibrium profiles were used to predict the most unstable modes, show that in a number of cases this model reproduces the measured neutron rate well.

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Research Organization:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); General Atomics, San Diego, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Nuclear Energy (NE); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC02-09CH11466; SC-G903402; FC02-04ER54698; AC52-07NA27344

OSTI ID:: 1353401

Alternate ID(s):: OSTI ID: 1361428; OSTI ID: 1840840

Report Number(s):: LLNL-JRNL-830739

Journal Information:: Nuclear Fusion, Vol. 57, Issue 5; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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References (29)

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Integrated modeling of high β _N steady state scenario on DIII-D Park, J. M.; Ferron, J. R.; Holcomb, C. T. Physics of Plasmas, Vol. 25, Issue 1 https://doi.org/10.1063/1.5013021	journal	January 2018
Distortion of fuel-ion distribution functions by Alfvén eigenmodes in a tokamak DT plasma Sugiyama, S.; Matsuura, H.; Ogawa, K. Plasma Physics and Controlled Fusion, Vol. 60, Issue 10 https://doi.org/10.1088/1361-6587/aad76d	journal	August 2018
Subdominant modes and optimization trends of DIII-D reverse magnetic shear configurations Varela, J.; Spong, D. A.; Murakami, M. Nuclear Fusion, Vol. 59, Issue 4 https://doi.org/10.1088/1741-4326/ab0052	journal	February 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
Enhanced radial energy transport induced by radially curved Alfvén eigenmode wavefronts Kramer, G. J.; Tobias, B. J.; Turnbull, A. Nuclear Fusion, Vol. 59, Issue 9 https://doi.org/10.1088/1741-4326/ab2ee3	journal	July 2019
Subdominant modes and optimization trends of DIII-D reverse magnetic shear configurations Varela, J.; Spong, D. A.; Murakami, M. arXiv https://doi.org/10.48550/arxiv.1904.01193	text	January 2019

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Title: Improving fast-ion confinement in high-performance discharges by suppressing Alfvén eigenmodes

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