Hybrid simulations of fishbone instabilities and Alfvén eigenmodes in DIIID tokamak
Abstract
In DIIID hybrid discharges, the intense Alfvén eigenmode (AE) activity driven by Neutral Beam Injection that is typically observed can be suppressed and replaced by fishbone modes when Electron Cyclotron Current Drive (ECCD) is centrally applied. Simulations have been carried out with the kineticmagnetohydrodynamic hybrid code M3DK based on DIIID discharges #161401 without ECCD and #161403 with ECCD, respectively. In both cases, unstable modes are found—the mode frequency and the mode structure indicate that the instability excited in #161403 is of fishbone type, while that in #161401 is identified as the betainduced Alfvén eigenmodelike mode. We find that the calculated mode frequencies of these two shots are consistent with experimental observations. A systematic scan has been performed to study the instability region of $n=1,2,3$ modes in $({q}_{0},{\beta}_{hot})$ parameter space, where n is the toroidal mode number, ${q}_{0}$ is the safety factor value at the magnetic axis, and ${\beta}_{hot}$ is the energetic particle beta. It is found that the transition between AEs and fishbone modes can occur when ${q}_{0}$ is changed. In addition, the modes of $n=1,2,3$ are stable or weakly unstable in the region of ${P}_{hot}/{P}_{\text{total}}\le 0.5$ and $1.2<{q}_{0}<1.3$, where ${P}_{hot}$ is the central energetic particle pressure and ${P}_{\text{total}}$ is the central total pressure. These results provide useful guidance for future experiments for minimizing energetic particledriven instabilities and associated transport.
 Authors:

 Dalian Univ. of Technology (China). Key Lab. of Materials Modification by Laser, Ion and Electron Beams. School of Physics
 Zhejiang Univ., Hangzhou (China). Inst. for Fusion Theory and Simulation. Dept. of Physics
 General Atomics, San Diego, CA (United States)
 Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
 Columbia Univ., New York, NY (United States)
 Publication Date:
 Research Org.:
 Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); General Atomics, San Diego, CA (United States); Dalian Univ. of Technology (China); Zhejiang Univ., Hangzhou (China)
 Sponsoring Org.:
 USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC24); National Key R&D Program of China; National Natural Science Foundation of China (NNSFC); Fundamental Research Funds for the Central Universities (China); Dalian Youth Science and Technology Project Support Program (China)
 OSTI Identifier:
 1490156
 Alternate Identifier(s):
 OSTI ID: 1462438
 Grant/Contract Number:
 FC0204ER54698; 2017YFE0301900; 11675083; DUT18ZD101; 2015R01
 Resource Type:
 Accepted Manuscript
 Journal Name:
 Physics of Plasmas
 Additional Journal Information:
 Journal Volume: 25; Journal Issue: 12; Journal ID: ISSN 1070664X
 Publisher:
 American Institute of Physics (AIP)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; magnetohydrodynamics; plasma waves; plasma confinement; computer programming; magnetic confinement fusion; tokamaks; magnetic confinement device; Alfvén eigenmode; fishbone instability; DIIID; ECCD; energetic particle
Citation Formats
Ren, ZhenZhen, Fu, G. Y., Van Zeeland, M. A., Wang, Feng, Wang, ZhengXiong, Nazikian, R., Turco, F., and Petty, C. C. Hybrid simulations of fishbone instabilities and Alfvén eigenmodes in DIIID tokamak. United States: N. p., 2018.
Web. doi:10.1063/1.5064647.
Ren, ZhenZhen, Fu, G. Y., Van Zeeland, M. A., Wang, Feng, Wang, ZhengXiong, Nazikian, R., Turco, F., & Petty, C. C. Hybrid simulations of fishbone instabilities and Alfvén eigenmodes in DIIID tokamak. United States. doi:10.1063/1.5064647.
Ren, ZhenZhen, Fu, G. Y., Van Zeeland, M. A., Wang, Feng, Wang, ZhengXiong, Nazikian, R., Turco, F., and Petty, C. C. Thu .
"Hybrid simulations of fishbone instabilities and Alfvén eigenmodes in DIIID tokamak". United States. doi:10.1063/1.5064647. https://www.osti.gov/servlets/purl/1490156.
@article{osti_1490156,
title = {Hybrid simulations of fishbone instabilities and Alfvén eigenmodes in DIIID tokamak},
author = {Ren, ZhenZhen and Fu, G. Y. and Van Zeeland, M. A. and Wang, Feng and Wang, ZhengXiong and Nazikian, R. and Turco, F. and Petty, C. C.},
abstractNote = {In DIIID hybrid discharges, the intense Alfvén eigenmode (AE) activity driven by Neutral Beam Injection that is typically observed can be suppressed and replaced by fishbone modes when Electron Cyclotron Current Drive (ECCD) is centrally applied. Simulations have been carried out with the kineticmagnetohydrodynamic hybrid code M3DK based on DIIID discharges #161401 without ECCD and #161403 with ECCD, respectively. In both cases, unstable modes are found—the mode frequency and the mode structure indicate that the instability excited in #161403 is of fishbone type, while that in #161401 is identified as the betainduced Alfvén eigenmodelike mode. We find that the calculated mode frequencies of these two shots are consistent with experimental observations. A systematic scan has been performed to study the instability region of n=1,2,3 modes in (q0,βhot) parameter space, where n is the toroidal mode number, q0 is the safety factor value at the magnetic axis, and βhot is the energetic particle beta. It is found that the transition between AEs and fishbone modes can occur when q0 is changed. In addition, the modes of n=1,2,3 are stable or weakly unstable in the region of Phot/Ptotal≤0.5 and 1.2<q0<1.3, where Phot is the central energetic particle pressure and Ptotal is the central total pressure. These results provide useful guidance for future experiments for minimizing energetic particledriven instabilities and associated transport.},
doi = {10.1063/1.5064647},
journal = {Physics of Plasmas},
number = 12,
volume = 25,
place = {United States},
year = {2018},
month = {12}
}
Web of Science
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