| Effects of external magnetic filter on behaviors of fast primary electrons in a volume negative ion source. | |
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MedLine Citation:
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PMID: 18315147 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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The relationship between enhancement of hydrogen negative ion H(-), volume production, and behaviors of fast primary electrons is studied theoretically. Trajectories of fast primary electrons are calculated, including collisional effects with hydrogen molecules. Active region of fast electrons depends strongly on the field intensity of the magnetic filter (MF), B(MF), and filament position. Therefore, spatial distributions of ionization and vibrational excitation collision points are also affected with changing B(MF). Although number of vibrational excitation collision points is much smaller than that of ionization collision points due to different mean free path, the relative intensity is varied by changing energy of fast electrons. According to the results and discussions including transport of produced vibrationally excited molecules, for enhancement of H(-) production, it is desired that fast electrons should approach the MF position and move into the downstream region as deep as possible without destruction of H(-) ions. To realize these conditions, good combination between filament position and the intensity of the MF should be required. |
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Authors:
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Shigefumi Mori; Osamu Fukumasa |
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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: 0034-6748 ISO Abbreviation: Rev Sci Instrum Publication Date: 2008 Feb |
Date Detail:
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Created Date: 2008-03-04 Completed Date: 2008-04-30 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: 02A526 Citation Subset: - |
Affiliation:
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Graduate School of Science and Engineering, Yamaguchi University, Ube, Japan. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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