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  Alfven instabilities driven by circulating ions in optimized stellarators and their possible consequences in a Helias reactor

Kolesnichenko, Y. I., Lutsenko, V. V., Wobig, H., & Yakovenko, V. (2002). Alfven instabilities driven by circulating ions in optimized stellarators and their possible consequences in a Helias reactor. Physics of Plasmas, 9(2), 517-528.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-4209-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-420A-8
Genre: Journal Article

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 Creators:
Kolesnichenko, Y. I.1, Author
Lutsenko, V. V.1, Author
Wobig, H.2, 3, Author              
Yakovenko, V.1, Author
Affiliations:
1Sci Ctr Inst Nucl Res, UA-03680 Kiev, Ukraine, ou_persistent22              
2Stellarator Theory (ST), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856287              
3Experimental Plasma Physics 3 (E3), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856291              

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 Abstract: This work investigates circulating-particle-induced Alfven instabilities in optimized stellarators of the Wendelstein line [F. Wagner, Trans. Fusion Tech. 33, 67 (1998)]. A general expression for the growth rate of the instabilities is obtained and analyzed. It is shown that the absence of the axial symmetry makes it possible that various types of Alfven eigenmodes will be destabilized; both the kind of destabilized Alfven eigenmodes and the type of the resonances driving the instability may differ from those in tokamaks. In particular, an important role of the helicity-induced resonance is predicted. The discovered new resonances may considerably increase the instability growth rate of both the "gap" modes and the eigenmodes residing below cylindrical Alfven continuum. The upper limits of the local energy losses of circulating alpha-particles caused by various Alfven instabilities in a four-period Helias reactor [C. D. Beidler , in Fusion Energy 2000, 18th International Atomic Energy Agency Conference Proceedings, Sorrento, 2000 (International Atomic Energy Agency, Vienna, 2001), Report IAEA-CN-77/FT/4] are evaluated. It is found that certain destabilized Alfven eigenmodes will affect only alphas with the energy well below 3.5 MeV, which seems to open a possibility to remove the helium ash by exciting the corresponding Alfven eigenmodes by either energetic particles or an antenna system. (C) 2002 American Institute of Physics.

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Language(s): eng - English
 Dates: 2002
 Publication Status: Published in print
 Pages: -
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 Rev. Type: Peer
 Identifiers: eDoc: 20698
ISI: 000173418700019
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Title: Physics of Plasmas
  Alternative Title : Phys. Plasmas
Source Genre: Journal
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Pages: - Volume / Issue: 9 (2) Sequence Number: - Start / End Page: 517 - 528 Identifier: ISSN: 1070-664X