Measurement of Paα line from pellet ablation cloud in Heliotron J
| Autor: | A. Iwata, S. Kado, M. Murakumo, T. Shikama, G. Motojima, A. Mori, C. Feng, H. Okada, T. Minami, S. Ohshima, S. Kobayashi, A. Ishizawa, Y. Nakamura, S. Konoshima, T. Mizuuchi, K. Nagasaki |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Review of Scientific Instruments. 93:113537 |
| ISSN: | 1089-7623 0034-6748 |
| DOI: | 10.1063/5.0101885 |
| Popis: | The Pa α line (1875.13 nm) in the near-infrared (NIR) region was evaluated to apply Stark broadening of the line spectrum to the electron density measurement of the small-pellet ablation cloud in Heliotron J, a medium-sized helical-axis heliotron device. Pa α is three-to-four times broader than the visible H β line (486.13 nm) for the same electron density. Using a portable NIR spectrometer, preliminary proof-of-concept experiments determined the marginal density, below which the broadening was undetectable. The lower detection density limit can be decreased using a narrower entrance slit or a denser grating. |
| Databáze: | OpenAIRE |
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