Isotope dependence of beta-induced Alfvén eigenmode (BAE) and low frequency mode (LFM) stability in DIII-D

Heidbrink, W. W.; Choi, Gyung Jin; Van Zeeland, Michael A.; Austin, M. E.; Degrandchamp, G. H.; Spong, Donald A.; Bierwage, Andreas; Crocker, N. A.; Du, X. D.; Lauber, P.; Lin, Z.; McKee, G. R.

doi:10.1088/1741-4326/ac189d

Isotope dependence of beta-induced Alfvén eigenmode (BAE) and low frequency mode (LFM) stability in DIII-D

Journal Article · Tue Sep 21 00:00:00 EDT 2021 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ac189d· OSTI ID:1842589

^[1]; ^[1]; ^[2]; Austin, M. E. ^[3]; ^[1]; ^[4]; ^[5]; ^[6]; ^[2]; Lauber, P. ^[7]; Lin, Z. ^[1]; ^[8]

Univ. of California, Irvine, CA (United States)
General Atomics, San Diego, CA (United States)
Univ. of Texas, Austin, TX (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Rokkasho Fusion Inst., Aomori (Japan)
Univ. of California, Los Angeles, CA (United States)
Max Planck Institute for Plasma Physics, Garching (Germany)
Univ. of Wisconsin, Madison, WI (United States)

The stability of beta-induced Alfvén eigenmodes (BAE) and the low frequency modes (LFMs) that were formerly called beta-induced Alfvén-acoustic eigenmodes is discussed. Here, after a brief summary of previous publications on the stability in DIII-D beam-heated, reversed-shear, deuterium plasmas with deuterium neutral beam injection (NBI), new observations in mixed hydrogen and deuterium plasmas are reported. With deuterium NBI, BAEs are at least as unstable in mixed-species plasmas as in deuterium plasmas; however, with hydrogen NBI, the BAEs are stable. In contrast, the LFMs are unaffected by changes in beam species, consistent with the previous observation that LFMs are not driven by high-energy beam ions. As predicted by theory, the LFMs appear more unstable in mixed species plasmas than in pure deuterium discharges.

View Accepted Manuscript (DOE)

Research Organization:: General Atomics, San Diego, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); University of California, Irvine, Irvine, CA (United States); University of California, Los Angeles, Los Angeles, CA (United States)

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

Grant/Contract Number:: AC05-00OR22725; FC02-04ER54698; SC0019352; SC0020337

OSTI ID:: 1842589

Alternate ID(s):: OSTI ID: 23131867

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 10 Vol. 61; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

References (14)

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Stability of beta-induced Alfvén eigenmodes (BAE) in DIII-D Heidbrink, W. W.; Van Zeeland, M. A.; Austin, M. E. Nuclear Fusion, Vol. 61, Issue 6 https://doi.org/10.1088/1741-4326/abf953	journal	May 2021
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