Hybrid simulation study on ion heating by low-frequency wave excited in a field-reversed configuration
In this paper, we use hybrid simulation to elucidate the plasma heating mechanism due to waves excited in Field-Reversed Configuration (FRC) plasma. The plasma parameters are a separatrix radius of 0.16 m and a separatrix length of 1.16 m ( x -point position is z = ± 0.57 m). The wave excitation ant...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2025-01-01
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| Series: | Nuclear Fusion |
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| Online Access: | https://doi.org/10.1088/1741-4326/adb2a6 |
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| author | Takahiro Urano Toshiki Takahashi Naoki Mizuguchi Tomohiko Asai Shigefumi Okada |
| author_facet | Takahiro Urano Toshiki Takahashi Naoki Mizuguchi Tomohiko Asai Shigefumi Okada |
| author_sort | Takahiro Urano |
| collection | DOAJ |
| description | In this paper, we use hybrid simulation to elucidate the plasma heating mechanism due to waves excited in Field-Reversed Configuration (FRC) plasma. The plasma parameters are a separatrix radius of 0.16 m and a separatrix length of 1.16 m ( x -point position is z = ± 0.57 m). The wave excitation antenna consists of two loop antennas with a radius of 0.3 m and is placed at a position of z = ± 0.5 m. The current waveform of the antenna is a sine wave with a maximum current value of 30 kA and a frequency of 160 kHz. The simulation results showed that the excited waves caused compression/expansion of the plasma, and at the same time, the temperature of the plasma increased or decreased at the compressed/expanded position. When waves are applied, a 23% increase in the volume-averaged ion temperature in the separatrix is observed compared to the case without waves applied. On the other hand, no increase in electron temperature is observed. For the electron fluid, the adiabatic condition is well established, and temperature changes are observed as the plasma compressed and expanded. On the other hand, for ions, kinetic energy perpendicular to the magnetic field lines increases during compression, and part of this energy is transferred to the energy of the parallel component by collisionless pitch angle scattering, resulting in heating due to the so-called magnetic pumping. |
| format | Article |
| id | doaj-art-a7d877eadd0c46699d0cfd7f40fce8eb |
| institution | DOAJ |
| issn | 0029-5515 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Nuclear Fusion |
| spelling | doaj-art-a7d877eadd0c46699d0cfd7f40fce8eb2025-08-20T02:43:42ZengIOP PublishingNuclear Fusion0029-55152025-01-0165303602610.1088/1741-4326/adb2a6Hybrid simulation study on ion heating by low-frequency wave excited in a field-reversed configurationTakahiro Urano0Toshiki Takahashi1Naoki Mizuguchi2Tomohiko Asai3https://orcid.org/0000-0001-9440-0117Shigefumi Okada4Graduate School of Science and Technology, Gunma University , Kiryu, JapanGraduate School of Science and Technology, Gunma University , Kiryu, JapanNational Institute for Fusion Science , Toki, JapanCollege of Science and Technology, Nihon University , Tokyo, JapanOsaka University , Osaka, JapanIn this paper, we use hybrid simulation to elucidate the plasma heating mechanism due to waves excited in Field-Reversed Configuration (FRC) plasma. The plasma parameters are a separatrix radius of 0.16 m and a separatrix length of 1.16 m ( x -point position is z = ± 0.57 m). The wave excitation antenna consists of two loop antennas with a radius of 0.3 m and is placed at a position of z = ± 0.5 m. The current waveform of the antenna is a sine wave with a maximum current value of 30 kA and a frequency of 160 kHz. The simulation results showed that the excited waves caused compression/expansion of the plasma, and at the same time, the temperature of the plasma increased or decreased at the compressed/expanded position. When waves are applied, a 23% increase in the volume-averaged ion temperature in the separatrix is observed compared to the case without waves applied. On the other hand, no increase in electron temperature is observed. For the electron fluid, the adiabatic condition is well established, and temperature changes are observed as the plasma compressed and expanded. On the other hand, for ions, kinetic energy perpendicular to the magnetic field lines increases during compression, and part of this energy is transferred to the energy of the parallel component by collisionless pitch angle scattering, resulting in heating due to the so-called magnetic pumping.https://doi.org/10.1088/1741-4326/adb2a6field-reversed configurationhybrid simulationlow-frequency waveion heatingmagnetic pumping |
| spellingShingle | Takahiro Urano Toshiki Takahashi Naoki Mizuguchi Tomohiko Asai Shigefumi Okada Hybrid simulation study on ion heating by low-frequency wave excited in a field-reversed configuration Nuclear Fusion field-reversed configuration hybrid simulation low-frequency wave ion heating magnetic pumping |
| title | Hybrid simulation study on ion heating by low-frequency wave excited in a field-reversed configuration |
| title_full | Hybrid simulation study on ion heating by low-frequency wave excited in a field-reversed configuration |
| title_fullStr | Hybrid simulation study on ion heating by low-frequency wave excited in a field-reversed configuration |
| title_full_unstemmed | Hybrid simulation study on ion heating by low-frequency wave excited in a field-reversed configuration |
| title_short | Hybrid simulation study on ion heating by low-frequency wave excited in a field-reversed configuration |
| title_sort | hybrid simulation study on ion heating by low frequency wave excited in a field reversed configuration |
| topic | field-reversed configuration hybrid simulation low-frequency wave ion heating magnetic pumping |
| url | https://doi.org/10.1088/1741-4326/adb2a6 |
| work_keys_str_mv | AT takahirourano hybridsimulationstudyonionheatingbylowfrequencywaveexcitedinafieldreversedconfiguration AT toshikitakahashi hybridsimulationstudyonionheatingbylowfrequencywaveexcitedinafieldreversedconfiguration AT naokimizuguchi hybridsimulationstudyonionheatingbylowfrequencywaveexcitedinafieldreversedconfiguration AT tomohikoasai hybridsimulationstudyonionheatingbylowfrequencywaveexcitedinafieldreversedconfiguration AT shigefumiokada hybridsimulationstudyonionheatingbylowfrequencywaveexcitedinafieldreversedconfiguration |