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...
| Main Authors: | , , , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2021-02-01
|
| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-021-83191-3 |
| _version_ | 1818570680352899072 |
|---|---|
| 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 |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-14T13:45:08Z |
| format | Article |
| id | doaj.art-5f0ced1a7f654bad8548a3327a9e0c00 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-12-14T13:45:08Z |
| publishDate | 2021-02-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-5f0ced1a7f654bad8548a3327a9e0c002022-12-21T22:59:20ZengNature PortfolioScientific Reports2045-23222021-02-011111910.1038/s41598-021-83191-3The first observation of 4D tomography measurement of plasma structures and fluctuationsChanho Moon0Kotaro Yamasaki1Yoshihiko Nagashima2Shigeru Inagaki3Takeshi Ido4Takuma Yamada5Naohiro Kasuya6Yusuke Kosuga7Makoto Sasaki8Yuichi Kawachi9Daiki Nishimura10Taiki Kobayashi11Akihide Fujisawa12Research Institute for Applied Mechanics, Kyushu UniversityResearch Institute for Applied Mechanics, Kyushu UniversityResearch Institute for Applied Mechanics, Kyushu UniversityResearch Institute for Applied Mechanics, Kyushu UniversityResearch Institute for Applied Mechanics, Kyushu UniversityFaculty of Arts and Science, Kyushu UniversityResearch Institute for Applied Mechanics, Kyushu UniversityResearch Institute for Applied Mechanics, Kyushu UniversityResearch Institute for Applied Mechanics, Kyushu UniversityInterdisciplinary Graduate School of Engineering Sciences, Kyushu UniversityInterdisciplinary Graduate School of Engineering Sciences, Kyushu UniversityInterdisciplinary Graduate School of Engineering Sciences, Kyushu UniversityResearch Institute for Applied Mechanics, Kyushu UniversityAbstract 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.https://doi.org/10.1038/s41598-021-83191-3 |
| spellingShingle | 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 Scientific Reports |
| title | 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_short | 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 |
| url | https://doi.org/10.1038/s41598-021-83191-3 |
| work_keys_str_mv | AT chanhomoon thefirstobservationof4dtomographymeasurementofplasmastructuresandfluctuations AT kotaroyamasaki thefirstobservationof4dtomographymeasurementofplasmastructuresandfluctuations AT yoshihikonagashima thefirstobservationof4dtomographymeasurementofplasmastructuresandfluctuations AT shigeruinagaki thefirstobservationof4dtomographymeasurementofplasmastructuresandfluctuations AT takeshiido thefirstobservationof4dtomographymeasurementofplasmastructuresandfluctuations AT takumayamada thefirstobservationof4dtomographymeasurementofplasmastructuresandfluctuations AT naohirokasuya thefirstobservationof4dtomographymeasurementofplasmastructuresandfluctuations AT yusukekosuga thefirstobservationof4dtomographymeasurementofplasmastructuresandfluctuations AT makotosasaki thefirstobservationof4dtomographymeasurementofplasmastructuresandfluctuations AT yuichikawachi thefirstobservationof4dtomographymeasurementofplasmastructuresandfluctuations AT daikinishimura thefirstobservationof4dtomographymeasurementofplasmastructuresandfluctuations AT taikikobayashi thefirstobservationof4dtomographymeasurementofplasmastructuresandfluctuations AT akihidefujisawa thefirstobservationof4dtomographymeasurementofplasmastructuresandfluctuations AT chanhomoon firstobservationof4dtomographymeasurementofplasmastructuresandfluctuations AT kotaroyamasaki firstobservationof4dtomographymeasurementofplasmastructuresandfluctuations AT yoshihikonagashima firstobservationof4dtomographymeasurementofplasmastructuresandfluctuations AT shigeruinagaki firstobservationof4dtomographymeasurementofplasmastructuresandfluctuations AT takeshiido firstobservationof4dtomographymeasurementofplasmastructuresandfluctuations AT takumayamada firstobservationof4dtomographymeasurementofplasmastructuresandfluctuations AT naohirokasuya firstobservationof4dtomographymeasurementofplasmastructuresandfluctuations AT yusukekosuga firstobservationof4dtomographymeasurementofplasmastructuresandfluctuations AT makotosasaki firstobservationof4dtomographymeasurementofplasmastructuresandfluctuations AT yuichikawachi firstobservationof4dtomographymeasurementofplasmastructuresandfluctuations AT daikinishimura firstobservationof4dtomographymeasurementofplasmastructuresandfluctuations AT taikikobayashi firstobservationof4dtomographymeasurementofplasmastructuresandfluctuations AT akihidefujisawa firstobservationof4dtomographymeasurementofplasmastructuresandfluctuations |