| Spectroscopic evaluation of three different gratings used for a flat-field extreme ultraviolet spectrometer to monitor Delta n=1 transitions from medium-Z impurities in 10-30 A. | |
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MedLine Citation:
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PMID: 19044679 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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Spectral characteristics of varied line spacing 2400 grooves/mm gratings used for a flat-field extreme ultraviolet spectrometer have been evaluated to monitor Delta n=1 (n=2-3) transitions from medium-Z impurities in 10-30 A, where many spectral lines from metallic impurities closely exist. For this purpose emission spectra of the Delta n=1 transitions from partially L-shell-ionized Ti and Fe have been measured in large helical device. At first, a ruled and a holographic grating were utilized for the comparative study. Both gratings suppressed higher order light effectively but spectral sensitivity was much higher for the holographic grating. The ruled grating, however, attained better spectral resolution (0.083 A at 18.97 A) in the 10-100 A range compared to that (0.130 A) of the holographic grating. After that a recently developed new holographic grating with different laminar shapes and line spacings has attempted to improve the spectral resolution. As a result, it has considerably improved the spectral resolution in the 10-30 A range, i.e., approximately 0.090 A. However, it is found that the experimentally obtained spectral resolution is quit poor compared to the computationally simulated one, suggesting a technical difficulty in manufacturing exactly the varied line spacing of the holographic grating at such a short wavelength range. |
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Authors:
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Malay Bikas Chowdhuri; Shigeru Morita; Motoshi Goto; Hiroyuki Sasai |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Review of scientific instruments Volume: 79 ISSN: 1089-7623 ISO Abbreviation: Rev Sci Instrum Publication Date: 2008 Oct |
Date Detail:
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Created Date: 2008-12-02 Completed Date: 2009-02-17 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0405571 Medline TA: Rev Sci Instrum Country: United States |
Other Details:
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Languages: eng Pagination: 10F537 Citation Subset: - |
Affiliation:
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Department of Fusion Science, Graduate University for Advanced studies, Toki, Gifu 509-5292, Japan. chowdhuri.malay@nifs.ac.jp |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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