Fast ion JET diagnostics: confinement and losses

Journal Article · Wed Mar 12 00:00:00 EDT 2008 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2905082· OSTI ID:21136783

Kiptily, V G; Pinches, S D; Sharapov, S E; Syme, D B ^[1]; Borba, D; Nabais, F ^[2]; Cecil, F E ^[3]; Cecconello, M ^[4]; Darrow, D; Hill, K ^[5]; Goloborod'ko, V; Yavorskij, V ^[6]; Johnson, T ^[7]; Murari, A ^[8]; Reich, M ^[9]; Chugunov, I N; Gin, D B; Shevelev, A E ^[10]; Gorini, G ^[11]; Zoita, V ^[12]

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1. Euratom/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon (United Kingdom)
2. Euratom/IST Fusion Association, Centro de Fusao Nuclear, 1049-001 Lisboa (Portugal)
3. Colorado School of Mines, Golden, CO (United States)
4. Association EURATOM-VR, Royal Institute of Technology KTH, Stockholm (Sweden)
5. Princeton Plasma Physics Lab, Princeton NJ (United States)
6. Euratom/OEAW Association, Institute for Theoretical Physics, University of Innsbruck (Austria)
7. Euratom--VR Association, Alfven Laboratory, Royal Institute of Technology, 10044 Stockholm (Sweden)
8. Consorzio RFX--Associazione Euratom-Enea sulla Fusione, I-35127 Padova (Italy)
9. Euratom/MPI fuaer Plasmaphysik Association, Garching (Germany)
10. Ioffe Physico-Thechnical Institute, 194021 St. Petersburg (Russian Federation)
11. Istituto di Fisica del Plasma, EURATOM-ENEA-CNR Association, Milan (Italy)
12. Euratom-MedC Association, National Institute for Laser, Plasma and Radiation Physics, Bucharest (Romania)

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, {sup 3}He and {sup 4}He, 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 {sup 3}He-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.

• OSTI ID: 21136783
• Journal Information: AIP Conference Proceedings, Vol. 988, Issue 1; Conference: International conference on burning plasma diagnostics, Varenna (Italy), 24-28 Sep 2007; Other Information: DOI: 10.1063/1.2905082; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA). JET-EFDA Contributors; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAM INJECTION HEATING
DIAGNOSTIC TECHNIQUES
HELIUM 3
HELIUM 4
ICR HEATING
JET TOKAMAK
MAGNETIC FIELD CONFIGURATIONS
MAGNETOHYDRODYNAMICS
NEUTRAL ATOM BEAM INJECTION
PLASMA
PLASMA CONFINEMENT
PLASMA DIAGNOSTICS
PLASMA INSTABILITY
SAWTOOTH OSCILLATIONS
SHEAR
SLOWING-DOWN
TAIL IONS
TOKAMAK DEVICES