| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
Prev
Next
|
|
|
Numerical simulation of the multiple reversed shear Alfvén eigenmodes associated with the triangularity Alfvén gap |
| Wenjia Wang(王文家)1,2,3, Deng Zhou(周登)1,3, Youjun Hu(胡友俊)1,3, Yue Ming(明玥)1,2,3, Baolong Hao(郝保龙)1,2 |
1 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;
2 University of Science and Technology of China, Hefei 230026, China;
3 Center for Magnetic Fusion Theory, Chinese Academy of Sciences, Hefei 230031, China |
|
|
|
|
Abstract It was found that there are multiplicity of low shear toroidicity-induced Alfvén eigenmodes in a zero beta limit if the inverse aspect ratio is larger than the magnetic shear at the mode location (Candy 1996 Phys. Lett. A 215 299). Because the reversed shear Alfvén eigenmode (RSAE) and even the RSAE associated with the non-circular triangularity-induced Alfvén eigenmode (NAE) gap (NAE-RSAE) usually reside near the shear-reversal point, the condition that the inverse aspect ratio is larger than the magnetic shear is naturally satisfied. For this reason, we numerically investigate the existence of multiplicity of core-localized NAE-RSAEs and mode characteristics in the present work. We firstly verify the existence of the multiplicity for zero beta plasma by using a D-shaped equilibrium. It is pointed out that, for a given toroidal mode number, the Alfvén cascade spectrum accommodates down-sweeping and up-sweeping modes above and below the NAE range of frequencies. An analytical model for the existence of multiple RSAE modes is in good agreement with the simulation results. One notices that the triangularity has a greater effect on the odd-type modes than that on the even-type modes:the odd-type modes come into existence because of the plasma triangularity.
|
Received: 05 June 2018
Revised: 30 August 2018
Accepted manuscript online:
|
|
PACS:
|
52.35.Bj
|
(Magnetohydrodynamic waves (e.g., Alfven waves))
|
| |
83.50.Jf
|
(Extensional flow and combined shear and extension)
|
| |
52.65.-y
|
(Plasma simulation)
|
|
| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11675222). |
Corresponding Authors:
Wenjia Wang
E-mail: wenjiawang@ipp.ac.cn
|
Cite this article:
Wenjia Wang(王文家), Deng Zhou(周登), Youjun Hu(胡友俊), Yue Ming(明玥), Baolong Hao(郝保龙) Numerical simulation of the multiple reversed shear Alfvén eigenmodes associated with the triangularity Alfvén gap 2018 Chin. Phys. B 27 125202
|
| [1] |
Guo S C, Chen L, Cai S D, et al. 1989 Chin. Phys. Lett. 6 309
|
| [2] |
Wong K L 1999 Plasma Phys. Control. Fusion 41 R1
|
| [3] |
Sharapov S E, Alper B, Berk H L, et al. 2013 Nucl. Fusion 53 104022
|
| [4] |
Wang J, Hu S H, Dai Q P and Yao L B 2010 Chin. Phys. B 19 095202
|
| [5] |
Chen W, Yu L M, Liu Y, et al. 2014 Nucl. Fusion 54 104002
|
| [6] |
Sharapov S E, Testa D, Alper B, et al. 2001 Phys. Lett. A 289 127
|
| [7] |
Nazikian R, Kramer G J, Cheng C Z, et al. 2003 Phys. Rev. Lett. 91 125003
|
| [8] |
Zeel, M A V, Kramer G J, Nazikian R, et al. 2005 Plasma Phys. Control. Fusion 47 L31
|
| [9] |
Kramer G J, Fu G Y, Nazikian R, et al. 2008 Plasma Phys. Control. Fusion 50 082001
|
| [10] |
Edlund E M, Porkolab M, Kramer G J, et al. 2010 Plasma Phys. Control. Fusion 52 115003
|
| [11] |
Berk H L, Borba D N, Breizman B N, et al. 2001 Phys. Rev. Lett. 87
|
| [12] |
Breizman B N, Berk H L, Pekker M S, et al. 2003 Phys. Plasmas 10 3649
|
| [13] |
Xie H S and Xiao Y 2015 Phys. Plasmas 22 022518
|
| [14] |
Fu G Y and Berk H L 2006 Phys. Plasmas 13 052502
|
| [15] |
Gorelenkov N N, Kramer G J and Nazikian R 2006 Plasma Phys. Control. Fusion 48 1255
|
| [16] |
Kramer G J, Gorelenkov N N, Nazikian R and Cheng C Z 2004 Plasma Phys. Control. Fusion 46 L23
|
| [17] |
Gorelenkov N N, Kramer G J and Nazikian R 2011 Phys. Plasmas 18 102503
|
| [18] |
Fasoli A, Testa D, Sharapov S, et al. 2002 Plasma Phys. Control. Fusion 44 B159
|
| [19] |
Kramer G J and Fu G Y 2006 Plasma Phys. Control. Fusion 48 1285
|
| [20] |
Betti R and Freidberg J P 1991 Phys. Fluids B: Plasma Phys. 3 1865
|
| [21] |
Betti R and Freidberg J P 1992 Phys. Fluids B: Plasma Phys. 4 1465
|
| [22] |
Chen W, Yu L M, Ding X T, et al. 2016 Nucl. Fusion 56 036018
|
| [23] |
Candy J, Breizman B, Van Dam J and Ozeki T 1996 Phys. Lett. A 215 299
|
| [24] |
Marchenko V S 2009 Phys. Plasmas 16 044504
|
| [25] |
Wang W J, Zhou D, Hu Y J and Ming Y 2018 AIP Adv. 8 035104
|
| [26] |
Cheng C and Chance M 1987 J. Comput. Phys. 71 124
|
| [27] |
Yang W J, Li G Q, Hu Y J and Gao X 2017 Fusion Eng. Design 114 118
|
| [28] |
Hu Y J, Li G Q, Gorelenkov N N, et al. 2014 Phys. Plasmas 21 052510
|
| No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
Altmetric
|
|
blogs
Facebook pages
Wikipedia page
Google+ users
|
Online attention
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
View more on Altmetrics
|
|
|
