F. Kin, S. Inagaki, K. Nagasaki, M. Luo, K. Itoh, K. Shinohara, A. Terakado, T. Minami, S. Kado, Shinji Kobayashi, S. Ohshima, T. Bando, N. Oyama, M. Yoshida
{"title":"Observation of avalanche-like transport in Heliotron J and JT-60U plasmas","authors":"F. Kin, S. Inagaki, K. Nagasaki, M. Luo, K. Itoh, K. Shinohara, A. Terakado, T. Minami, S. Kado, Shinji Kobayashi, S. Ohshima, T. Bando, N. Oyama, M. Yoshida","doi":"10.1088/1741-4326/ad3f2d","DOIUrl":null,"url":null,"abstract":"\n The avalanche type of transport can induce a long-radial transport and thus can contribute to the global profile formation. In this study, we observed the heat perturbations exhibiting avalanche-like transport in the stellarator/heliotron device, Heliotron J, and the tokamak device, JT-60U. We found that the electron heat propagation in Heliotron J is mainly generated from the heating source region. The relatively high value of the Hurst exponent, which is a signature of avalanches, depends on the total heating power. On the other hand, the electron and ion heat avalanches measured in JT-60U tend to spread from the local peak of the temperature gradient and are not influenced by the heating source profiles. The contrasting features of avalanches in stellarator/heliotrons and tokamaks potentially imply the difference in the temperature profile formation, such as the presence of stiffness.","PeriodicalId":503481,"journal":{"name":"Nuclear Fusion","volume":"106 10","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nuclear Fusion","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1088/1741-4326/ad3f2d","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
The avalanche type of transport can induce a long-radial transport and thus can contribute to the global profile formation. In this study, we observed the heat perturbations exhibiting avalanche-like transport in the stellarator/heliotron device, Heliotron J, and the tokamak device, JT-60U. We found that the electron heat propagation in Heliotron J is mainly generated from the heating source region. The relatively high value of the Hurst exponent, which is a signature of avalanches, depends on the total heating power. On the other hand, the electron and ion heat avalanches measured in JT-60U tend to spread from the local peak of the temperature gradient and are not influenced by the heating source profiles. The contrasting features of avalanches in stellarator/heliotrons and tokamaks potentially imply the difference in the temperature profile formation, such as the presence of stiffness.
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