The first observation of 4D tomography measurement of plasma structures and fluctuations
Abstract A tomography system is installed as one of the diagnostics of new age to examine the three-dimensional characteristics of structure and dynamics including fluctuations of a linear magnetized helicon plasma. The system is composed of three sets of tomography components located at different a...
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2021
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oai:doaj.org-article:5f0ced1a7f654bad8548a3327a9e0c002021-12-02T14:04:00ZThe first observation of 4D tomography measurement of plasma structures and fluctuations10.1038/s41598-021-83191-32045-2322https://doaj.org/article/5f0ced1a7f654bad8548a3327a9e0c002021-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-83191-3https://doaj.org/toc/2045-2322Abstract A tomography system is installed as one of the diagnostics of new age to examine the three-dimensional characteristics of structure and dynamics including fluctuations of a linear magnetized helicon plasma. The system is composed of three sets of tomography components located at different axial positions. Each tomography component can measure the two-dimensional emission profile over the entire cross-section of plasma at different axial positions in a sufficient temporal scale to detect the fluctuations. The four-dimensional measurement including time and space successfully obtains the following three results that have never been found without three-dimensional measurement: (1) in the production phase, the plasma front propagates from the antenna toward the end plate with an ion acoustic velocity. (2) In the steady state, the plasma emission profile is inhomogeneous, and decreases along the axial direction in the presence of the azimuthal asymmetry. Furthermore, (3) in the steady state, the fluctuations should originate from a particular axial position located downward from the helicon antenna.Chanho MoonKotaro YamasakiYoshihiko NagashimaShigeru InagakiTakeshi IdoTakuma YamadaNaohiro KasuyaYusuke KosugaMakoto SasakiYuichi KawachiDaiki NishimuraTaiki KobayashiAkihide FujisawaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021) |
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DOAJ |
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EN |
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Medicine R Science Q |
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Medicine R Science Q Chanho Moon Kotaro Yamasaki Yoshihiko Nagashima Shigeru Inagaki Takeshi Ido Takuma Yamada Naohiro Kasuya Yusuke Kosuga Makoto Sasaki Yuichi Kawachi Daiki Nishimura Taiki Kobayashi Akihide Fujisawa The first observation of 4D tomography measurement of plasma structures and fluctuations |
| description |
Abstract A tomography system is installed as one of the diagnostics of new age to examine the three-dimensional characteristics of structure and dynamics including fluctuations of a linear magnetized helicon plasma. The system is composed of three sets of tomography components located at different axial positions. Each tomography component can measure the two-dimensional emission profile over the entire cross-section of plasma at different axial positions in a sufficient temporal scale to detect the fluctuations. The four-dimensional measurement including time and space successfully obtains the following three results that have never been found without three-dimensional measurement: (1) in the production phase, the plasma front propagates from the antenna toward the end plate with an ion acoustic velocity. (2) In the steady state, the plasma emission profile is inhomogeneous, and decreases along the axial direction in the presence of the azimuthal asymmetry. Furthermore, (3) in the steady state, the fluctuations should originate from a particular axial position located downward from the helicon antenna. |
| format |
article |
| author |
Chanho Moon Kotaro Yamasaki Yoshihiko Nagashima Shigeru Inagaki Takeshi Ido Takuma Yamada Naohiro Kasuya Yusuke Kosuga Makoto Sasaki Yuichi Kawachi Daiki Nishimura Taiki Kobayashi Akihide Fujisawa |
| author_facet |
Chanho Moon Kotaro Yamasaki Yoshihiko Nagashima Shigeru Inagaki Takeshi Ido Takuma Yamada Naohiro Kasuya Yusuke Kosuga Makoto Sasaki Yuichi Kawachi Daiki Nishimura Taiki Kobayashi Akihide Fujisawa |
| author_sort |
Chanho Moon |
| title |
The first observation of 4D tomography measurement of plasma structures and fluctuations |
| title_short |
The first observation of 4D tomography measurement of plasma structures and fluctuations |
| title_full |
The first observation of 4D tomography measurement of plasma structures and fluctuations |
| title_fullStr |
The first observation of 4D tomography measurement of plasma structures and fluctuations |
| title_full_unstemmed |
The first observation of 4D tomography measurement of plasma structures and fluctuations |
| title_sort |
first observation of 4d tomography measurement of plasma structures and fluctuations |
| publisher |
Nature Portfolio |
| publishDate |
2021 |
| url |
https://doaj.org/article/5f0ced1a7f654bad8548a3327a9e0c00 |
| work_keys_str_mv |
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