Evaluation of deuterium recycling properties by fueling termination in the EAST superconducting tokamak
Deuterium recycling properties have been investigated in the EAST superconducting tokamak by evaluating the density decay time after the fueling termination. The density decay time of the latter discharge of the experiment of a day is ∼2.9 s, which is more than three times longer than that of the be...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-10-01
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| Series: | Nuclear Materials and Energy |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352179122001673 |
| _version_ | 1811198389015019520 |
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| author | Mizuki Sakamoto Yaowei Yu Naoko Ashikawa Xianzu Gong Wei Xu Jilei Hou Bin Cao Guizhong Zuo Jiansheng Hu |
| author_facet | Mizuki Sakamoto Yaowei Yu Naoko Ashikawa Xianzu Gong Wei Xu Jilei Hou Bin Cao Guizhong Zuo Jiansheng Hu |
| author_sort | Mizuki Sakamoto |
| collection | DOAJ |
| description | Deuterium recycling properties have been investigated in the EAST superconducting tokamak by evaluating the density decay time after the fueling termination. The density decay time of the latter discharge of the experiment of a day is ∼2.9 s, which is more than three times longer than that of the beginning discharge (∼0.88 s), indicating that a repeat of discharges diminishes the wall conditioning effect by lithium coating. However, the difference in deuterium recycling among three magnetic configurations (lower single null, double null, and upper single null) is unclear. The density decay times are 3.3 s and 4.1 s when the strike point (SP) positions are located on the horizontal and vertical plates of the lower outer divertor, showing that the particle exhaust capability becomes stronger as the SP position approaches the pumping slot. Furthermore, the lower hybrid current drive (LHCD) power enhances deuterium recycling since the density decay times of high (∼2.7 MW) and low (∼0.8 MW) power LHCD discharges are 4.3 s and 1.2 s, respectively. The density decay time in the LHCD discharge linearly increases with an increase in a period of exponential fitting, implying that the recycling coefficient increases during the stop of fueling. However, the density decay time in the ohmic discharge is independent of the fitting time. |
| first_indexed | 2024-04-12T01:30:17Z |
| format | Article |
| id | doaj.art-08991539fb86442b88bedd381471efe4 |
| institution | Directory Open Access Journal |
| issn | 2352-1791 |
| language | English |
| last_indexed | 2024-04-12T01:30:17Z |
| publishDate | 2022-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Materials and Energy |
| spelling | doaj.art-08991539fb86442b88bedd381471efe42022-12-22T03:53:31ZengElsevierNuclear Materials and Energy2352-17912022-10-0133101286Evaluation of deuterium recycling properties by fueling termination in the EAST superconducting tokamakMizuki Sakamoto0Yaowei Yu1Naoko Ashikawa2Xianzu Gong3Wei Xu4Jilei Hou5Bin Cao6Guizhong Zuo7Jiansheng Hu8Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan; Corresponding author.Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, ChinaNational Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan; SOKENDAI, 322-6 Oroshi-cho, Toki 509-5292, JapanInstitute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, ChinaInstitute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, ChinaInstitute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, ChinaInstitute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, ChinaInstitute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, ChinaInstitute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, ChinaDeuterium recycling properties have been investigated in the EAST superconducting tokamak by evaluating the density decay time after the fueling termination. The density decay time of the latter discharge of the experiment of a day is ∼2.9 s, which is more than three times longer than that of the beginning discharge (∼0.88 s), indicating that a repeat of discharges diminishes the wall conditioning effect by lithium coating. However, the difference in deuterium recycling among three magnetic configurations (lower single null, double null, and upper single null) is unclear. The density decay times are 3.3 s and 4.1 s when the strike point (SP) positions are located on the horizontal and vertical plates of the lower outer divertor, showing that the particle exhaust capability becomes stronger as the SP position approaches the pumping slot. Furthermore, the lower hybrid current drive (LHCD) power enhances deuterium recycling since the density decay times of high (∼2.7 MW) and low (∼0.8 MW) power LHCD discharges are 4.3 s and 1.2 s, respectively. The density decay time in the LHCD discharge linearly increases with an increase in a period of exponential fitting, implying that the recycling coefficient increases during the stop of fueling. However, the density decay time in the ohmic discharge is independent of the fitting time.http://www.sciencedirect.com/science/article/pii/S2352179122001673 |
| spellingShingle | Mizuki Sakamoto Yaowei Yu Naoko Ashikawa Xianzu Gong Wei Xu Jilei Hou Bin Cao Guizhong Zuo Jiansheng Hu Evaluation of deuterium recycling properties by fueling termination in the EAST superconducting tokamak Nuclear Materials and Energy |
| title | Evaluation of deuterium recycling properties by fueling termination in the EAST superconducting tokamak |
| title_full | Evaluation of deuterium recycling properties by fueling termination in the EAST superconducting tokamak |
| title_fullStr | Evaluation of deuterium recycling properties by fueling termination in the EAST superconducting tokamak |
| title_full_unstemmed | Evaluation of deuterium recycling properties by fueling termination in the EAST superconducting tokamak |
| title_short | Evaluation of deuterium recycling properties by fueling termination in the EAST superconducting tokamak |
| title_sort | evaluation of deuterium recycling properties by fueling termination in the east superconducting tokamak |
| url | http://www.sciencedirect.com/science/article/pii/S2352179122001673 |
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