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Fast ion JET diagnostics: Confinement and losses
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
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2008 (English)In: BURNING PLASMA DIAGNOSTICS, 2008, Vol. 988, 283-290 p.Conference paper, Published paper (Refereed)
Abstract [en]

A study of magnetically confined fast ions in tokamaks plays an important role in burning plasma research. To reach ignition and steady burning of a reactor plasma an adequate confinement of energetic ions produced by NBI heating, accelerated with ICRF and born in fusion reactions is essential to provide efficient heating of the bulk plasma. Thus, investigation of the fast ion behaviour is an immediate task for present-day large machines, such as JET, in order to understand the main mechanisms of slowing down, redistribution and losses, and to develop optimal plasma scenarios. Today's JET has an enhanced suite of fast ion diagnostics both of confined and lost ions that enable to significantly contribute to this important area of research. Fast ion populations of p, d, t, 3He and 4He, made with ICRF, NBI, and fusion reactions have been investigated in experiments on JET with sophisticated diagnostics in conventional and shear-reversed plasmas, exploring a wide range of effects. This paper will introduce to the JET fast-ion diagnostic techniques and will give an overview of recent observations. A synergy of the unique diagnostic set was utilised in JET, and studies of the response of fast ions to MHD modes (e.g. tornado modes, sawtooth crashes), fast 3He-ions behaviour in shear-reversed plasmas are impressive examples of that. Some results on fast ion losses in JET experiments with various levels of the toroidal field ripple will be demonstrated.

Place, publisher, year, edition, pages
2008. Vol. 988, 283-290 p.
Series
AIP Conference proceedings, ISSN 0094-243X
Keyword [en]
Burning plasmas, Diagnostics, Fast ions, Tokamak
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-26170DOI: 10.1063/1.2905082ISI: 000254687600043Scopus ID: 2-s2.0-42449138255OAI: oai:DiVA.org:kth-26170DiVA: diva2:371647
Conference
International Conference on Burning Plasma Diagnostics Varenna, ITALY, SEP 24-28, 2007
Note
QC 20101122Available from: 2010-11-22 Created: 2010-11-19 Last updated: 2010-11-22Bibliographically approved

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Johnson, Thomas J.

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