Investigation of spatial distribution characteristics of emission intensity in detachment on the divertor simulator TPDsheet-ICR
For the first time, we have revealed the spatial structure of a detached plasma with electron–ion recombination (EIR) and molecular-activated recombination (MAR) in response to changes in ion temperature (Ti) and gas pressure. This was achieved using high-density sheet plasma generated by a linear d...
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Elsevier
2024-12-01
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| Series: | Nuclear Materials and Energy |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352179124002254 |
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| author | A. Tonegawa N. Okada K. Miura H. Natsume K.N. Sato K. Hoshino Y. Hayashi S. Masuzaki S. Yamoto |
| author_facet | A. Tonegawa N. Okada K. Miura H. Natsume K.N. Sato K. Hoshino Y. Hayashi S. Masuzaki S. Yamoto |
| author_sort | A. Tonegawa |
| collection | DOAJ |
| description | For the first time, we have revealed the spatial structure of a detached plasma with electron–ion recombination (EIR) and molecular-activated recombination (MAR) in response to changes in ion temperature (Ti) and gas pressure. This was achieved using high-density sheet plasma generated by a linear divertor simulator (TPDsheet-ICR). The parallel-plate electrodes were positioned above and below the sheet plasma (∼1019 m−3). We varied the Ti from 3 to 7 eV using ion cyclotron resonance heating and investigated the parameters of the detached plasma near the target in the divergent field region. Plasma emission intensities at Balmer series (Hα and Hγ) and Fulcher band wavelengths (610 ± 10 nm) were measured with a high-speed camera equipped with an Arbaa prism. Additionally, a Langmuir probe measured the electron density and temperature of the plasma. Our results show that as the Ti increases, EIR generated near the plasma periphery disappears, while MAR gradually forms near the plasma center during the transition from detached to attached plasma. This transition occurs because the increase in Ti in the detached plasma transfers energy from ions to electrons, raising the high-energy component of the electrons, resulting in EIR disappearance and the onset of MAR. |
| format | Article |
| id | doaj-art-5d09ca1c43e44a0bbb2bf3efa9f231ee |
| institution | Kabale University |
| issn | 2352-1791 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Elsevier |
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| series | Nuclear Materials and Energy |
| spelling | doaj-art-5d09ca1c43e44a0bbb2bf3efa9f231ee2024-12-21T04:28:28ZengElsevierNuclear Materials and Energy2352-17912024-12-0141101802Investigation of spatial distribution characteristics of emission intensity in detachment on the divertor simulator TPDsheet-ICRA. Tonegawa0N. Okada1K. Miura2H. Natsume3K.N. Sato4K. Hoshino5Y. Hayashi6S. Masuzaki7S. Yamoto8Tokai University, 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan; Corresponding author at: Tokai University, 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan.Tokai University, 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292, JapanTokai University, 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292, JapanTokai University, 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292, JapanKyushu University, 744 Motooka Nishi-ku Fukuoka 819-0395, JapanKeio University, 4-1-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8521 JapanThe University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, JapanNifs, 322-6 Oroshi-cho, Toki City, GIFU Prefecture 509-5292 JapanQST, 801-1 Mukoyama, Naka-shi, Ibaraki 311-0193, JapanFor the first time, we have revealed the spatial structure of a detached plasma with electron–ion recombination (EIR) and molecular-activated recombination (MAR) in response to changes in ion temperature (Ti) and gas pressure. This was achieved using high-density sheet plasma generated by a linear divertor simulator (TPDsheet-ICR). The parallel-plate electrodes were positioned above and below the sheet plasma (∼1019 m−3). We varied the Ti from 3 to 7 eV using ion cyclotron resonance heating and investigated the parameters of the detached plasma near the target in the divergent field region. Plasma emission intensities at Balmer series (Hα and Hγ) and Fulcher band wavelengths (610 ± 10 nm) were measured with a high-speed camera equipped with an Arbaa prism. Additionally, a Langmuir probe measured the electron density and temperature of the plasma. Our results show that as the Ti increases, EIR generated near the plasma periphery disappears, while MAR gradually forms near the plasma center during the transition from detached to attached plasma. This transition occurs because the increase in Ti in the detached plasma transfers energy from ions to electrons, raising the high-energy component of the electrons, resulting in EIR disappearance and the onset of MAR.http://www.sciencedirect.com/science/article/pii/S2352179124002254DivertorDetached/attached plasmaLinear divertor simulatorsIon cyclotron resonance heating2D emission intensityBalmer series |
| spellingShingle | A. Tonegawa N. Okada K. Miura H. Natsume K.N. Sato K. Hoshino Y. Hayashi S. Masuzaki S. Yamoto Investigation of spatial distribution characteristics of emission intensity in detachment on the divertor simulator TPDsheet-ICR Nuclear Materials and Energy Divertor Detached/attached plasma Linear divertor simulators Ion cyclotron resonance heating 2D emission intensity Balmer series |
| title | Investigation of spatial distribution characteristics of emission intensity in detachment on the divertor simulator TPDsheet-ICR |
| title_full | Investigation of spatial distribution characteristics of emission intensity in detachment on the divertor simulator TPDsheet-ICR |
| title_fullStr | Investigation of spatial distribution characteristics of emission intensity in detachment on the divertor simulator TPDsheet-ICR |
| title_full_unstemmed | Investigation of spatial distribution characteristics of emission intensity in detachment on the divertor simulator TPDsheet-ICR |
| title_short | Investigation of spatial distribution characteristics of emission intensity in detachment on the divertor simulator TPDsheet-ICR |
| title_sort | investigation of spatial distribution characteristics of emission intensity in detachment on the divertor simulator tpdsheet icr |
| topic | Divertor Detached/attached plasma Linear divertor simulators Ion cyclotron resonance heating 2D emission intensity Balmer series |
| url | http://www.sciencedirect.com/science/article/pii/S2352179124002254 |
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