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Effects of external magnetic filter on behaviors of fast primary electrons in a volume negative ion source.
MedLine Citation:
PMID:  18315147     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
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.
Authors:
Shigefumi Mori; Osamu Fukumasa
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Review of scientific instruments     Volume:  79     ISSN:  0034-6748     ISO Abbreviation:  Rev Sci Instrum     Publication Date:  2008 Feb 
Date Detail:
Created Date:  2008-03-04     Completed Date:  2008-04-30     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0405571     Medline TA:  Rev Sci Instrum     Country:  United States    
Other Details:
Languages:  eng     Pagination:  02A526     Citation Subset:  -    
Affiliation:
Graduate School of Science and Engineering, Yamaguchi University, Ube, Japan.
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