{"title":"Parity Transition of MHD Instabilities in LHD Experiments","authors":"Yuki Takemura, Kiyomasa Watanabe","doi":"10.1007/s10894-026-00558-y","DOIUrl":null,"url":null,"abstract":"<div>\n \n <p>This study reviews experimental observations of parity transitions in the mode structures of magnetohydrodynamic (MHD) instabilities in magnetically confined plasmas. The transition between even and odd-parity modes, which is closely related to changes in the topology of a magnetic vessel, suggests the formation and healing of the magnetic island. While the transitions from even to odd parity have been reported in several tokamak devices, recent experiments in the Large Helical Device (LHD) have revealed conventional even-to-odd parity transitions due to various instabilities and a novel transition from odd to even parity. These include transitions associated with energetic ion-driven resistive interchange instabilities, locked-mode-like instabilities, ”Edge” MHD instabilities, and double-odd-parity modes. These findings highlight the need for advanced diagnostics and theoretical modeling to further clarify the mechanisms governing parity transitions.</p>\n </div>","PeriodicalId":634,"journal":{"name":"Journal of Fusion Energy","volume":"45 1","pages":""},"PeriodicalIF":2.1000,"publicationDate":"2026-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10894-026-00558-y.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Fusion Energy","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s10894-026-00558-y","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"NUCLEAR SCIENCE & TECHNOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
This study reviews experimental observations of parity transitions in the mode structures of magnetohydrodynamic (MHD) instabilities in magnetically confined plasmas. The transition between even and odd-parity modes, which is closely related to changes in the topology of a magnetic vessel, suggests the formation and healing of the magnetic island. While the transitions from even to odd parity have been reported in several tokamak devices, recent experiments in the Large Helical Device (LHD) have revealed conventional even-to-odd parity transitions due to various instabilities and a novel transition from odd to even parity. These include transitions associated with energetic ion-driven resistive interchange instabilities, locked-mode-like instabilities, ”Edge” MHD instabilities, and double-odd-parity modes. These findings highlight the need for advanced diagnostics and theoretical modeling to further clarify the mechanisms governing parity transitions.
期刊介绍：
The Journal of Fusion Energy features original research contributions and review papers examining and the development and enhancing the knowledge base of thermonuclear fusion as a potential power source. It is designed to serve as a journal of record for the publication of original research results in fundamental and applied physics, applied science and technological development. The journal publishes qualified papers based on peer reviews.
This journal also provides a forum for discussing broader policies and strategies that have played, and will continue to play, a crucial role in fusion programs. In keeping with this theme, readers will find articles covering an array of important matters concerning strategy and program direction.
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
