Effects of gas puff and pump on plasma detachment associated with molecular activated recombination in GAMMA 10/PDX
| Autor: | Naomichi Ezumi, Junko Kohagura, Masayuki Yoshikawa, Mizuki Sakamoto, Sotaro Yamashita, Yousuke Nakashima, Takaaki Iijima, Kunpei Nojiri, A. Terakado, Takayuki Yokodo, Satoshi Togo, Tsubasa Yoshimoto, Yosuke Kinoshita, Tomohiro Mikami |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Nuclear and High Energy Physics Materials science Tandem Hydrogen Materials Science (miscellaneous) Divertor Hydrogen molecule Physics::Optics chemistry.chemical_element Plasma lcsh:TK9001-9401 01 natural sciences Plenum space 010305 fluids & plasmas Nuclear Energy and Engineering chemistry 0103 physical sciences lcsh:Nuclear engineering. Atomic power Electron temperature Atomic physics Recombination |
| Zdroj: | Nuclear Materials and Energy, Vol 20, Iss, Pp-(2019) |
| ISSN: | 2352-1791 |
| Popis: | Gas puff and pump experiments on the plasma applied in a divertor simulation were conducted in the GAMMA 10/PDX tandem mirror. Additional hydrogen gas was supplied to the plasma with and without a pump in the region of the divertor simulation. To decrease the electron temperature near the target plate, the gas is supplied at a higher plenum pressure with the use of a pump than without a pump. We observed differences in the characteristics of the plasma detachment caused by molecular activated recombination (MAR) between cases with and without a pump at the same electron temperature. Near the target plate, particle loss with the use of a pump is smaller than that without a pump. By contrast, the vibrational and rotational temperatures of hydrogen molecules in the two cases are almost identical. The density of hydrogen molecules with a pump is lower than that without a pump, indicating that the electron temperature can be decreased even with a lower hydrogen density when a pump is applied. These results suggest that one of reasons for the suppression of the MAR with the use of a pump is the low density of the hydrogen molecules. Keywords: Plasma detachment, Molecular activated recombination (MAR), Pumping, Hydrogen molecule |
| Databáze: | OpenAIRE |
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