Effect of plasma beta on the nonlinear evolution of m/n = 2/1 double tearing mode in high Lundquist number regime
The existing results indicate that in the large Lundquist number regime, plasmoids play an important role in the growth and saturation of the double tearing mode (DTM). In this paper, the effect of plasma beta on the nonlinear evolution of the m / n = 2/1 DTM in large Lundquist number regime is nume...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2025-01-01
|
| Series: | Nuclear Fusion |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1741-4326/ada628 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832593672922726400 |
|---|---|
| author | Dingzong Zhang Zhaoqing Wu Jun Ma Wenfeng Guo Yanqing Huang Hongbo Liu |
| author_facet | Dingzong Zhang Zhaoqing Wu Jun Ma Wenfeng Guo Yanqing Huang Hongbo Liu |
| author_sort | Dingzong Zhang |
| collection | DOAJ |
| description | The existing results indicate that in the large Lundquist number regime, plasmoids play an important role in the growth and saturation of the double tearing mode (DTM). In this paper, the effect of plasma beta on the nonlinear evolution of the m / n = 2/1 DTM in large Lundquist number regime is numerically investigated in a cylinder geometry. The results demonstrate that the impact of plasma beta on plasmoid dynamics varies significantly with the separation distance between rational surfaces. In the small separation regime ( $\Delta r = 0.1$ ), no plasmoids are observed, regardless of plasma beta and resistivity. However, when the separation is relatively large ( $\Delta r = 0.2$ or $\Delta r = 0.3$ ), plasmoids exhibit highly complex behavior under different plasma beta and resistivity conditions. For the medium separation $\Delta r = 0.2$ , the resistivity threshold for the emergence of plasmoids is approximately $2.5 \times {10^{ - 6}}$ and is not affected by plasma beta. Conversely, when the separation increases to $\Delta r = 0.3$ , the resistivity threshold is significantly influenced by plasma beta. Under certain conditions, this threshold can reach as high as $1.0 \times {10^{ - 5}}$ , which is much higher than the typical value of around ${10^{ - 7}}$ . Furthermore, a preliminary case study shows that the tokamak plasma rotation shear has a significant impact on plasmoid dynamic. |
| format | Article |
| id | doaj-art-3d8b72dd7e384756b9d9a57720629197 |
| institution | Kabale University |
| issn | 0029-5515 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Nuclear Fusion |
| spelling | doaj-art-3d8b72dd7e384756b9d9a577206291972025-01-20T10:19:41ZengIOP PublishingNuclear Fusion0029-55152025-01-0165202604310.1088/1741-4326/ada628Effect of plasma beta on the nonlinear evolution of m/n = 2/1 double tearing mode in high Lundquist number regimeDingzong Zhang0Zhaoqing Wu1Jun Ma2https://orcid.org/0000-0002-8114-7340Wenfeng Guo3https://orcid.org/0000-0002-0799-9342Yanqing Huang4Hongbo Liu5https://orcid.org/0000-0001-7798-2661College of Physics and Electronic Engineering, Hengyang Normal University , Hengyang 421008, China; Institute of Plasma Physics, Chinese Academy of Sciences , Hefei 230031, ChinaCollege of Physics and Electronic Engineering, Hengyang Normal University , Hengyang 421008, China; Institute of Plasma Physics, Chinese Academy of Sciences , Hefei 230031, ChinaInstitute of Plasma Physics, Chinese Academy of Sciences , Hefei 230031, ChinaInstitute of Plasma Physics, Chinese Academy of Sciences , Hefei 230031, ChinaCollege of Physics and Electronic Engineering, Hengyang Normal University , Hengyang 421008, ChinaCollege of Physics and Electronic Engineering, Hengyang Normal University , Hengyang 421008, ChinaThe existing results indicate that in the large Lundquist number regime, plasmoids play an important role in the growth and saturation of the double tearing mode (DTM). In this paper, the effect of plasma beta on the nonlinear evolution of the m / n = 2/1 DTM in large Lundquist number regime is numerically investigated in a cylinder geometry. The results demonstrate that the impact of plasma beta on plasmoid dynamics varies significantly with the separation distance between rational surfaces. In the small separation regime ( $\Delta r = 0.1$ ), no plasmoids are observed, regardless of plasma beta and resistivity. However, when the separation is relatively large ( $\Delta r = 0.2$ or $\Delta r = 0.3$ ), plasmoids exhibit highly complex behavior under different plasma beta and resistivity conditions. For the medium separation $\Delta r = 0.2$ , the resistivity threshold for the emergence of plasmoids is approximately $2.5 \times {10^{ - 6}}$ and is not affected by plasma beta. Conversely, when the separation increases to $\Delta r = 0.3$ , the resistivity threshold is significantly influenced by plasma beta. Under certain conditions, this threshold can reach as high as $1.0 \times {10^{ - 5}}$ , which is much higher than the typical value of around ${10^{ - 7}}$ . Furthermore, a preliminary case study shows that the tokamak plasma rotation shear has a significant impact on plasmoid dynamic.https://doi.org/10.1088/1741-4326/ada628plasmoidDTMhigh Lundquist number regime |
| spellingShingle | Dingzong Zhang Zhaoqing Wu Jun Ma Wenfeng Guo Yanqing Huang Hongbo Liu Effect of plasma beta on the nonlinear evolution of m/n = 2/1 double tearing mode in high Lundquist number regime Nuclear Fusion plasmoid DTM high Lundquist number regime |
| title | Effect of plasma beta on the nonlinear evolution of m/n = 2/1 double tearing mode in high Lundquist number regime |
| title_full | Effect of plasma beta on the nonlinear evolution of m/n = 2/1 double tearing mode in high Lundquist number regime |
| title_fullStr | Effect of plasma beta on the nonlinear evolution of m/n = 2/1 double tearing mode in high Lundquist number regime |
| title_full_unstemmed | Effect of plasma beta on the nonlinear evolution of m/n = 2/1 double tearing mode in high Lundquist number regime |
| title_short | Effect of plasma beta on the nonlinear evolution of m/n = 2/1 double tearing mode in high Lundquist number regime |
| title_sort | effect of plasma beta on the nonlinear evolution of m n 2 1 double tearing mode in high lundquist number regime |
| topic | plasmoid DTM high Lundquist number regime |
| url | https://doi.org/10.1088/1741-4326/ada628 |
| work_keys_str_mv | AT dingzongzhang effectofplasmabetaonthenonlinearevolutionofmn21doubletearingmodeinhighlundquistnumberregime AT zhaoqingwu effectofplasmabetaonthenonlinearevolutionofmn21doubletearingmodeinhighlundquistnumberregime AT junma effectofplasmabetaonthenonlinearevolutionofmn21doubletearingmodeinhighlundquistnumberregime AT wenfengguo effectofplasmabetaonthenonlinearevolutionofmn21doubletearingmodeinhighlundquistnumberregime AT yanqinghuang effectofplasmabetaonthenonlinearevolutionofmn21doubletearingmodeinhighlundquistnumberregime AT hongboliu effectofplasmabetaonthenonlinearevolutionofmn21doubletearingmodeinhighlundquistnumberregime |