Near-edge beta induced Alfven eigenmode in DIII-D high bootstrap current fraction plasmas

Jian, X. [General Atomics, San Diego, CA (United States); Chinese Academy of Science, Anhui (China); University of California, San Diego, La Jolla, CA (United States)] (ORCID:0000000330521694); Holland, C. [University of California, San Diego, La Jolla, CA (United States)] (ORCID:0000000160292306); Chan, V. [Chinese Academy of Science, Anhui (China)]; Qiu, Z. [Chinese Academy of Science, Anhui (China)] (ORCID:0000000275488819); Bass, E. [University of California, San Diego, La Jolla, CA (United States)]; Ding, S. [General Atomics, San Diego, CA (United States)] (ORCID:0000000219300439); Du, X. [General Atomics, San Diego, CA (United States)] (ORCID:0000000161272825); Zou, Y. [Chinese Academy of Science, Anhui (China); Southwestern Institute of Physics, Chengdu (China)] (ORCID:0000000333115931); Garofalo, A. [General Atomics, San Diego, CA (United States)] (ORCID:0000000282442448); Yu, G. [University of California at Davis, CA (United States); Hefei Comprehensive National Science Center (China)] (ORCID:0000000200025342); McClenaghan, J. [General Atomics, San Diego, CA (United States)] (ORCID:0000000347350991)

doi:10.1088/1741-4326/ae3333

DOE OSTI · 3484848

Near-edge beta induced Alfven eigenmode in DIII-D high bootstrap current fraction plasmas

Jian, X. [General Atomics, San Diego, CA (United States); Chinese Academy of Science, Anhui (China); University of California, San Diego, La Jolla, CA (United States)] (ORCID:0000000330521694)·Holland, C. [University of California, San Diego, La Jolla, CA (United States)] (ORCID:0000000160292306)·Chan, V. [Chinese Academy of Science, Anhui (China)]·Qiu, Z. [Chinese Academy of Science, Anhui (China)] (ORCID:0000000275488819)·Bass, E. [University of California, San Diego, La Jolla, CA (United States)]·Ding, S. [General Atomics, San Diego, CA (United States)] (ORCID:0000000219300439)·Du, X. [General Atomics, San Diego, CA (United States)] (ORCID:0000000161272825)·Zou, Y. [Chinese Academy of Science, Anhui (China); Southwestern Institute of Physics, Chengdu (China)] (ORCID:0000000333115931)·Garofalo, A. [General Atomics, San Diego, CA (United States)] (ORCID:0000000282442448)·Yu, G. [University of California at Davis, CA (United States); Hefei Comprehensive National Science Center (China)] (ORCID:0000000200025342)·McClenaghan, J. [General Atomics, San Diego, CA (United States)] (ORCID:0000000347350991)

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Abstract

In DIII-D high bootstrap current fraction plasmas heated solely by neutral beam injection, a fast ion-driven Beta-Induced Alfven Eigenmode (BAE) is frequently observed. The BAE peaks near the edge, suggesting the possibility of enhanced fast ion transport there and raising a potential concern for the first wall. Theoretical analysis and simulations show that the mode location is not fully determined by the fast-ion drive intensity, i.e. fast ion pressure gradient but is strongly related to the background unfavorable magnetic curvature drive near the edge, which is an intrinsic property of advanced scenarios that rely on a large radius internal transport barrier that exists for all the kinetic channels for performance improvement.

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Jian, X. [General Atomics, San Diego, CA (United States); Chinese Academy of Science, Anhui (China); University of California, San Diego, La Jolla, CA (United States)] (ORCID:0000000330521694), Holland, C. [University of California, San Diego, La Jolla, CA (United States)] (ORCID:0000000160292306), Chan, V. [Chinese Academy of Science, Anhui (China)], Qiu, Z. [Chinese Academy of Science, Anhui (China)] (ORCID:0000000275488819), Bass, E. [University of California, San Diego, La Jolla, CA (United States)], Ding, S. [General Atomics, San Diego, CA (United States)] (ORCID:0000000219300439), Du, X. [General Atomics, San Diego, CA (United States)] (ORCID:0000000161272825), Zou, Y. [Chinese Academy of Science, Anhui (China); Southwestern Institute of Physics, Chengdu (China)] (ORCID:0000000333115931), Garofalo, A. [General Atomics, San Diego, CA (United States)] (ORCID:0000000282442448), Yu, G. [University of California at Davis, CA (United States); Hefei Comprehensive National Science Center (China)] (ORCID:0000000200025342), McClenaghan, J. [General Atomics, San Diego, CA (United States)] (ORCID:0000000347350991). 2026-01-21. Near-edge beta induced Alfven eigenmode in DIII-D high bootstrap current fraction plasmas. https://doi.org/10.1088/1741-4326%2Fae3333

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