Preceding propagation of turbulence pulses at avalanche events in a magnetically confined plasma
Abstract The preceding propagation of turbulence pulses has been observed for the first time in heat avalanche events during the collapse of the electron internal transport barrier (e-ITB) in the Large Helical Device. The turbulence and heat pulses are generated near the foot of the e-ITB and propag...
| Main Authors: | , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2022-05-01
|
| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-022-10499-z |
| _version_ | 1828808267108712448 |
|---|---|
| author | N. Kenmochi K. Ida T. Tokuzawa R. Yasuhara H. Funaba H. Uehara D. J. Den Hartog I. Yamada M. Yoshinuma Y. Takemura H. Igami |
| author_facet | N. Kenmochi K. Ida T. Tokuzawa R. Yasuhara H. Funaba H. Uehara D. J. Den Hartog I. Yamada M. Yoshinuma Y. Takemura H. Igami |
| author_sort | N. Kenmochi |
| collection | DOAJ |
| description | Abstract The preceding propagation of turbulence pulses has been observed for the first time in heat avalanche events during the collapse of the electron internal transport barrier (e-ITB) in the Large Helical Device. The turbulence and heat pulses are generated near the foot of the e-ITB and propagate to the peripheral region within a much shorter time than the diffusion timescale. The propagation speed of the turbulence pulse is approximately 10 km/s, which is faster than that of the heat pulse propagating at a speed of 1.5 km/s. The heat pulse propagates at approximately the same speed as that in the theoretical prediction, whereas the turbulence pulse propagates one order of magnitude faster than that in the prediction, thereby providing important insights into the physics of non-local transport. |
| first_indexed | 2024-12-12T08:37:51Z |
| format | Article |
| id | doaj.art-e4fb845f0b06446981d21e8861f28f89 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-12-12T08:37:51Z |
| publishDate | 2022-05-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-e4fb845f0b06446981d21e8861f28f892022-12-22T00:30:52ZengNature PortfolioScientific Reports2045-23222022-05-011211910.1038/s41598-022-10499-zPreceding propagation of turbulence pulses at avalanche events in a magnetically confined plasmaN. Kenmochi0K. Ida1T. Tokuzawa2R. Yasuhara3H. Funaba4H. Uehara5D. J. Den Hartog6I. Yamada7M. Yoshinuma8Y. Takemura9H. Igami10National Institute for Fusion ScienceNational Institute for Fusion ScienceNational Institute for Fusion ScienceNational Institute for Fusion ScienceNational Institute for Fusion ScienceNational Institute for Fusion ScienceWisconsin Plasma Physics Laboratory, University of Wisconsin-MadisonNational Institute for Fusion ScienceNational Institute for Fusion ScienceNational Institute for Fusion ScienceNational Institute for Fusion ScienceAbstract The preceding propagation of turbulence pulses has been observed for the first time in heat avalanche events during the collapse of the electron internal transport barrier (e-ITB) in the Large Helical Device. The turbulence and heat pulses are generated near the foot of the e-ITB and propagate to the peripheral region within a much shorter time than the diffusion timescale. The propagation speed of the turbulence pulse is approximately 10 km/s, which is faster than that of the heat pulse propagating at a speed of 1.5 km/s. The heat pulse propagates at approximately the same speed as that in the theoretical prediction, whereas the turbulence pulse propagates one order of magnitude faster than that in the prediction, thereby providing important insights into the physics of non-local transport.https://doi.org/10.1038/s41598-022-10499-z |
| spellingShingle | N. Kenmochi K. Ida T. Tokuzawa R. Yasuhara H. Funaba H. Uehara D. J. Den Hartog I. Yamada M. Yoshinuma Y. Takemura H. Igami Preceding propagation of turbulence pulses at avalanche events in a magnetically confined plasma Scientific Reports |
| title | Preceding propagation of turbulence pulses at avalanche events in a magnetically confined plasma |
| title_full | Preceding propagation of turbulence pulses at avalanche events in a magnetically confined plasma |
| title_fullStr | Preceding propagation of turbulence pulses at avalanche events in a magnetically confined plasma |
| title_full_unstemmed | Preceding propagation of turbulence pulses at avalanche events in a magnetically confined plasma |
| title_short | Preceding propagation of turbulence pulses at avalanche events in a magnetically confined plasma |
| title_sort | preceding propagation of turbulence pulses at avalanche events in a magnetically confined plasma |
| url | https://doi.org/10.1038/s41598-022-10499-z |
| work_keys_str_mv | AT nkenmochi precedingpropagationofturbulencepulsesatavalancheeventsinamagneticallyconfinedplasma AT kida precedingpropagationofturbulencepulsesatavalancheeventsinamagneticallyconfinedplasma AT ttokuzawa precedingpropagationofturbulencepulsesatavalancheeventsinamagneticallyconfinedplasma AT ryasuhara precedingpropagationofturbulencepulsesatavalancheeventsinamagneticallyconfinedplasma AT hfunaba precedingpropagationofturbulencepulsesatavalancheeventsinamagneticallyconfinedplasma AT huehara precedingpropagationofturbulencepulsesatavalancheeventsinamagneticallyconfinedplasma AT djdenhartog precedingpropagationofturbulencepulsesatavalancheeventsinamagneticallyconfinedplasma AT iyamada precedingpropagationofturbulencepulsesatavalancheeventsinamagneticallyconfinedplasma AT myoshinuma precedingpropagationofturbulencepulsesatavalancheeventsinamagneticallyconfinedplasma AT ytakemura precedingpropagationofturbulencepulsesatavalancheeventsinamagneticallyconfinedplasma AT higami precedingpropagationofturbulencepulsesatavalancheeventsinamagneticallyconfinedplasma |