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  Alfvén Eigenmodes in shear reversed plasmas

Breizman, B. N., Berk, H. L., Pekker, M. S., Sharapov, S. E., Hawkes, N. C., Borba, D. N., et al. (2003). Alfvén Eigenmodes in shear reversed plasmas. In Fusion Energy 2002. Vienna: International Atomic Energy Agency.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0027-3BB7-C Version Permalink: https://hdl.handle.net/11858/00-001M-0000-0027-3BBD-F
Genre: Conference Paper

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Breizman, B. N.1, Author
Berk, H. L.1, Author
Pekker, M. S.1, Author
Sharapov, S. E.1, Author
Hawkes, N. C.1, Author
Borba, D. N.1, Author
Pinches, S. D.2, Author           
Affiliations:
1University of Texas, Austin, TX, USA; Euratom/UKAEA Fusion Association, Culham Science Center, Abingdon, Oxfordshire, United Kingdom; EFDA-JET Close Support Unit & Euratom/IST Association, Lisbon, Portugal, ou_persistent22              
2Tokamak Theory (TOK), Max Planck Institute for Plasma Physics, Max Planck Society

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 Abstract: Experiments on JT-60U and JET have shown that plasma configurations with shear reversal are prone to the excitation of unusual Alfvén eigenmodes by energetic particles. These modes emerge outside the TAE frequency gap, where one might expect them to be strongly damped. The modes often appear in bunches and they exhibit a quasi-periodic pattern of predominantly upward frequency sweeping (Alfvén Cascades) as the safety factor q changes in time. This work presents a theory that explains the key features of the observed unusual modes including their connection to TAE’s as well as the modifications of TAE’s themselves near the shear reversal point. The developed theory has been incorporated into a reduced numerical model and verified with full geometry codes. JET experimental data on Alfvén spectroscopy have been simulated to infer the mode numbers and the evolution of qmin in the discharge. This analysis confirms the values of q that characterize the internal transport barrier triggering in reversed shear plasmas.

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Language(s): eng - English
 Dates: 2003
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Internal
 Identifiers: eDoc: 60011
URI: http://www.iaea.org/programmes/ripc/physics/fec2002/pdf/th4_3.pdf
 Degree: -

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Title: 19th Fusion Energy Conference
Place of Event: Lyon (FR)
Start-/End Date: 2002-10-14 - 2002-10-19

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Title: Fusion Energy 2002
Source Genre: Proceedings
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Publ. Info: Vienna : International Atomic Energy Agency
Pages: CD-ROM Volume / Issue: - Sequence Number: TH/4-3 Start / End Page: - Identifier: -