Confinement degradation by Alfvén-eigenmode induced fast-ion transport in steady-state scenario discharges

Heidbrink, William W.; Ferron, John R.; Holcomb, Christopher T.; Van Zeeland, Michael A.; Chen, Xi; Collins, Cami M.; Garofalo, Andrea; Gong, Xianzu; Grierson, Brian A.; Podestà, Mario; Stagner, Luke; Zhu, Yubao

doi:10.1088/0741-3335/56/9/095030

Title: Confinement degradation by Alfvén-eigenmode induced fast-ion transport in steady-state scenario discharges

Journal Article · Thu Aug 21 00:00:00 EDT 2014 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/0741-3335/56/9/095030· OSTI ID:1356336

Heidbrink, William W. ^[1]; Ferron, John R. ^[2]; Holcomb, Christopher T. ^[3]; Van Zeeland, Michael A. ^[2]; Chen, Xi ^[4]; Collins, Cami M. ^[1]; Garofalo, Andrea ^[2]; Gong, Xianzu ^[5]; Grierson, Brian A. ^[6]; Podestà, Mario ^[6]; Stagner, Luke ^[1]; Zhu, Yubao ^[1]

Univ. of California, Irvine, CA (United States)
General Atomics, San Diego, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Oak Ridge Inst. for Science and Education (ORISE), Oak Ridge, TN (United States)
Chinese Academy of Sciences, Hefei (People's Republic of China)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Here, analysis of neutron and fast-ion D_α data from the DIII-D tokamak shows that Alfvén eigenmode activity degrades fast-ion confinement in many high β_N, high q_min, steady-state scenario discharges. (β_N is the normalized plasma pressure and q_min is the minimum value of the plasma safety factor.) Fast-ion diagnostics that are sensitive to the co-passing population exhibit the largest reduction relative to classical predictions. The increased fast-ion transport in discharges with strong AE activity accounts for the previously observed reduction in global confinement with increasing q_min; however, not all high q_min discharges show appreciable degradation. Two relatively simple empirical quantities provide convenient monitors of these effects: (1) an 'AE amplitude' signal based on interferometer measurements and (2) the ratio of the neutron rate to a zero-dimensional classical prediction.

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

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

Grant/Contract Number:: FC02-04ER54698

OSTI ID:: 1356336

Journal Information:: Plasma Physics and Controlled Fusion, Vol. 56, Issue 9; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 35 works

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