Investigations of Fast-Particle Behavior in Joint European Torus Plasmas Using Nuclear Techniques

Sadler, G.; Conroy, S.; Jarvis, O.N.; Belle, P. van; Adams, J. M.; Hone, M.

doi:10.13182/fst90-a29247

Cited by 77 publications

(67 citation statements)

References 5 publications

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“…In PLT, energy broadenings as large as -1 MeV were observed (Fig. 5); upshifts and downshifts of -1.5 MeV are observed in JET [60]. Examination of Eq.…”

Section: (3)mentioning

confidence: 89%

“…On the other hand, in plasmas with strong coupling between poloidal harmonics (high beta or strong shaping), sudden, large reductions in neutron emission are often observed. Sudden drops implying redistribution or expulsion of beam ions at the sawtooth crash have been reported for PLT [293], PDX [293], TFTR [313], JET [60,3401 and DIII-D [351]. As shown in Table 111, the magnitude of these reductions is comparable with the reductions associated with the fishbone instability, but the losses do not scale linearly with the amplitude of the field perturbation [293].…”

Section: Bo (Tis)mentioning

confidence: 90%

“…Fast ion populations during hydrogen minority heating were first observed on T-4 using a mass resolving charge exchange diagnostic [91- [60] are also observed. The prominent 4.4 MeV line produced by reactions between energetic protons and carbon impurities is shown in Fig.…”

Section: Ion Cyclotron Range Of Frequenciesmentioning

confidence: 99%

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The behaviour of fast ions in tokamak experiments

1994

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ABSTRACT. Fast ions with energies significantly larger than the bulk ion temperature are used to heat most tokamak plasmas. Fast ion populations created by fusion reactions, by neutral beam injection and by radiofrequency (RF) heating are usually concentrated in the centre of the plasma. The velocity distribution of these fast ion populations is determined primarily by Coulomb scattering; during wave heating, perpendicular acceleration by the RF waves is also important. Transport of fast ions is typically much slower than thermal transport, except during MHD events. Intense fast ion populations drive collective instabilities. Implications for the behaviour of alpha particles in future devices are discussed.

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“…In PLT, energy broadenings as large as -1 MeV were observed (Fig. 5); upshifts and downshifts of -1.5 MeV are observed in JET [60]. Examination of Eq.…”

Section: (3)mentioning

confidence: 89%

Section: Bo (Tis)mentioning

confidence: 90%

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The behaviour of fast ions in tokamak experiments

1994

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“…Experiments on CTs have shown that MHD activity can significantly deteriorate confinement of fast ions [3][4][5]. MHD activity was observed in experiments on the START spherical tokamak [6].…”

Section: Introductionmentioning

confidence: 98%

Transport of energetic ions during relaxation oscillations in plasmas of spherical tori

et al. 2001

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“…Nuclear reaction γ-ray diagnosis is one of the important techniques used on the JET tokamak for studying confined fast ions [1][2][3][4][5]. The intense γ-ray emission is produced in JET plasmas when fast ions (ICRF-driven ions, fusion products, NBI-injected ions) react either with fuel ions or with the main plasma impurities such as carbon and beryllium.…”

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confidence: 99%

Fast ion JET diagnostics: confinement and losses

Kiptily¹,

Borba²,

Cecil³

et al. 2008

AIP Conference Proceedings

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Abstract. 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, 3 He and 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 3 He-ions behaviour in shearreversed 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.

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Investigations of Fast-Particle Behavior in Joint European Torus Plasmas Using Nuclear Techniques

Cited by 77 publications

References 5 publications

The behaviour of fast ions in tokamak experiments

The behaviour of fast ions in tokamak experiments

Transport of energetic ions during relaxation oscillations in plasmas of spherical tori

Fast ion JET diagnostics: confinement and losses

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