UNDERLINE PHYSICS OF E - MEVVA OPERATION.

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Recently substantial enhancement of high ion charge states was clearly observed in both the HCEI and ITEP E-MEVVA ion sources. These experimental set-ups have two different methods of measuring the ion charge state distributions. The results can be considered as a proof of the E-MEVVA principle. These results sparked discussions regarding, which physics effects are dominant. Basic physics seems straightforward, an ion charge state in E-MEVVA is determined by the number of collisions with fast electrons versus the number of encounters with neutrals and lower charge state ions during an ion dwell time in the drift channel. However, the fluxes ... continued below

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8 pages

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HERSHCOVITCH,A.; BATALIN,V.A.; BUGAEV,A.S; DEBOLT,N.; GUSHENETS,V.I. & AL, ET June 24, 2002.

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Description

Recently substantial enhancement of high ion charge states was clearly observed in both the HCEI and ITEP E-MEVVA ion sources. These experimental set-ups have two different methods of measuring the ion charge state distributions. The results can be considered as a proof of the E-MEVVA principle. These results sparked discussions regarding, which physics effects are dominant. Basic physics seems straightforward, an ion charge state in E-MEVVA is determined by the number of collisions with fast electrons versus the number of encounters with neutrals and lower charge state ions during an ion dwell time in the drift channel. However, the fluxes of fast electrons, lower charge state ions, and neutrals encountered by an ion may be a consequence of numerous effects. Factors determining neutral fluxes might be poor vacuum conditions, desorption of adsorbed gas by the electron beam directly or indirectly due to stacking (E-beam reflection) and/or instabilities that cause heating and desorption. Flux and energy of the fast electrons is primarily determined by the electron gun output. But significant contributions from electron beam stacking, instabilities, as well as plasma electron heating, are possible.

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8 pages

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  • EMERGING APPLICATIONS OF VACUUM - ARC - PRODUCED PLASMA, ION AND ELECTRON BEAMS, LAKE BAIKAL (RU), 06/24/2002--06/27/2002

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  • Report No.: BNL--69383
  • Grant Number: AC02-98CH10886
  • Office of Scientific & Technical Information Report Number: 804608
  • Archival Resource Key: ark:/67531/metadc742007

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  • June 24, 2002

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  • Oct. 19, 2015, 7:39 p.m.

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  • Nov. 9, 2015, 4:30 p.m.

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HERSHCOVITCH,A.; BATALIN,V.A.; BUGAEV,A.S; DEBOLT,N.; GUSHENETS,V.I. & AL, ET. UNDERLINE PHYSICS OF E - MEVVA OPERATION., article, June 24, 2002; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc742007/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.