Studies of D-D fusion reactivity in high temperature JET plasmas

Adams, J. M.; Balet, B.; Boyd, D. A.; Campbell, D.J.; Challis, C.; Christiansen, J.; Cordey, J.G.; Core, W.G.F.; Costley, A.E.; Cottrell, G.A.; Edwards, A. W.; Elevant, T.; Eriksson, L.‐G.; Hellsten, T.; Jarvis, O.N.; Lallia, P.; Lawson, K.; Lowry, C.; Nielsen, P.; Sadler, G.; Start, D.F.H.; Thomas, P. R.; Hellermann, M. von; Weisen, H.

doi:10.1088/0029-5515/31/5/007

Cited by 18 publications

(12 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…6 gives us confidence that we have an accurate estimate of the central deuterium density. Furthermore, we find that the of the collimated neutrons seen by both the horizontal and the vertical cameras [1] density profile is correct. Finally, the TRANSP prediction for the total plasma energy, with contributions from the electrons, the ions and the fast ions, agrees with the total measured stored energy (diamagnetic or MHD) (see Fig.…”

Section: Analysis Technique Data Consistency Checks and Error Estimationmentioning

confidence: 57%

See 1 more Smart Citation

High temperature L- and H-mode confinement in JET

Balet

Boyd²,

Campbell

et al. 1990

Nucl. Fusion

View full text Add to dashboard Cite

The energy confinement properties of low density, high ion temperature L-and H-mode plasmas are investigated. For L-mode plasmas it is shown that, although the global confinement is independent of density, the energy confinement in the central region is significantly better at low densities than at higher densities. The improved confinement appears to be associated with the steepness of the density gradient. For the H-mode phase, although the confinement at the edge is dramatically improved, which is once again associated with the steep density gradient in the edge region, the central confinement properties are essentially the same as for the standard L-mode. The results are compared in a qualitative manner with the predictions of the ion temperature gradient instability theory and appear to be in disagreement with some aspects of this theory.

show abstract

Section: Analysis Technique Data Consistency Checks and Error Estimationmentioning

confidence: 57%

“…In this paper we discuss both the global and the local confinement properties of these discharges. The neutron properties of these pulses will be discussed in a companion paper [1] and the slowing down of the fast ions has been shown to be classical, except in extreme cases (see Ref. [2]).…”

Section: Introductionmentioning

confidence: 99%

High temperature L- and H-mode confinement in JET

Balet

Boyd²,

Campbell

et al. 1990

Nucl. Fusion

View full text Add to dashboard Cite

show abstract

“…10. The data imply that about 1.5% of the protons inside the 0.5 m radius have energies above 5 MeV [54].…”

Section: Ion Cyclotron Range Of Frequenciesmentioning

confidence: 91%

“…In JET, fusion gamma ray measurements indicate deuterium energies in excess of 1.7 MeV during second harmonic heating of deuterium beam ions [54].6 Gamma ray spectra for hydrogen minority heating with and without beam injection are shown in Fig. 10.…”

Section: Ion Cyclotron Range Of Frequenciesmentioning

confidence: 99%

“…JET charge exchange measurements of the hydrogen tail are also compatible with the expected power deposition without invoking spatial diffusion [103], but the variation of the gamma ray signal during a toroidal field scan [la11 and the rise in electron temperature following a sawtooth [123] did imply broadened power deposition. Figure 45 shows the temporal evolution of gamma rays produced by energetic minority protons during RF heating in JET [54]. Calculations that incorporate RF induced spatial diffusion can reproduce the signal, while neglect of transport results in a discrepancy (Fig.…”

Section: On T F T R [198] and The Triton Burnup Profile Was Measured mentioning

confidence: 99%

See 1 more Smart Citation

The behaviour of fast ions in tokamak experiments

1994

View full text Add to dashboard Cite

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.

show abstract