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
{"title":"Measurement of Pa<sub>α</sub> line from pellet ablation cloud in Heliotron J.","authors":"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","doi":"10.1063/5.0101885","DOIUrl":null,"url":null,"abstract":"<p><p>The Pa<sub>α</sub> 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<sub>α</sub> is three-to-four times broader than the visible H<sub>β</sub> 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.</p>","PeriodicalId":519534,"journal":{"name":"The Review of scientific instruments","volume":" ","pages":"113537"},"PeriodicalIF":0.0000,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"The Review of scientific instruments","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1063/5.0101885","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
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Abstract
The Paα 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. Paα is three-to-four times broader than the visible Hβ 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.
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