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

W. W. Heidbrink; G. J. Choi; M. A. Van Zeeland; M. E. Austin; G. H. Degrandchamp; D. A. Spong; A. Bierwage; N. A. Crocker; X. D. Du; P. Lauber; Z. Lin; G. R. McKee

doi:10.1088/1741-4326/ac189d

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

W. W. Heidbrink, G. J. Choi, M. A. Van Zeeland, M. E. Austin, G. H. Degrandchamp, D. A. Spong, A. Bierwage, N. A. Crocker, X. D. Du, P. Lauber, Z. Lin, G. R. McKee

Plasma Theory and Modeling

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Abstract

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. 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.

Original language	English
Article number	106021
Journal	Nuclear Fusion
Volume	61
Issue number	10
DOIs	https://doi.org/10.1088/1741-4326/ac189d
State	Published - Oct 2021

Keywords

Alfven eigenmode
fast ions
tokamak

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10.1088/1741-4326/ac189d

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Heidbrink, W. W., Choi, G. J., Van Zeeland, M. A., Austin, M. E., Degrandchamp, G. H., Spong, D. A., Bierwage, A., Crocker, N. A., Du, X. D., Lauber, P., Lin, Z., & McKee, G. R. (2021). Isotope dependence of beta-induced Alfvén eigenmode (BAE) and low frequency mode (LFM) stability in DIII-D. Nuclear Fusion, 61(10), Article 106021. https://doi.org/10.1088/1741-4326/ac189d

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title = "Isotope dependence of beta-induced Alfv{\'e}n eigenmode (BAE) and low frequency mode (LFM) stability in DIII-D",

abstract = "The stability of beta-induced Alfv{\'e}n eigenmodes (BAE) and the low frequency modes (LFMs) that were formerly called beta-induced Alfv{\'e}n-acoustic eigenmodes is discussed. 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.",

keywords = "Alfven eigenmode, fast ions, tokamak",

author = "Heidbrink, {W. W.} and Choi, {G. J.} and {Van Zeeland}, {M. A.} and Austin, {M. E.} and Degrandchamp, {G. H.} and Spong, {D. A.} and A. Bierwage and Crocker, {N. A.} and Du, {X. D.} and P. Lauber and Z. Lin and McKee, {G. R.}",

note = "Publisher Copyright: {\textcopyright} 2021 IAEA, Vienna.",

year = "2021",

month = oct,

doi = "10.1088/1741-4326/ac189d",

language = "English",

volume = "61",

journal = "Nuclear Fusion",

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AU - Heidbrink, W. W.

AU - Choi, G. J.

AU - Van Zeeland, M. A.

AU - Austin, M. E.

AU - Degrandchamp, G. H.

AU - Spong, D. A.

AU - Bierwage, A.

AU - Crocker, N. A.

AU - Du, X. D.

AU - Lauber, P.

AU - Lin, Z.

AU - McKee, G. R.

PY - 2021/10

Y1 - 2021/10

N2 - 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. 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.

AB - 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. 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.

KW - Alfven eigenmode

KW - fast ions

KW - tokamak

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DO - 10.1088/1741-4326/ac189d

M3 - Article

AN - SCOPUS:85116502508

SN - 0029-5515

VL - 61

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 10

M1 - 106021

ER -

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

Abstract

Keywords

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