Details

Autor(en) / Beteiligte

• Tamain, P.
• Bonhomme, G.
• Brochard, F.
• Clairet, F.
• Gil, C.
• Gunn, J.
• Hennequin, P.
• Hornung, G.
• Segui, J.L.
• Vermare, L.
• Ghendrih, Ph

Titel

Interaction of plasma transport and turbulence on particle fuelling

Ist Teil von

• Journal of nuclear materials, 2013-07, Vol.438 (S), p.S148-S154

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2013

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We report the results of an experimental investigation of the impact of Supersonic Molecular Beam Injection in the Tore Supra tokamak. Several diagnostics were synchronised with the injection to extract a global picture of the physics at play from the time scale of turbulence (∼10μs) to the full-recovery time (∼1s). As previously reported, a strong impact of the injection on density and temperature profiles is observed. Both fields exhibit a complex dynamic response involving different phases and time scales. In particular, we show that the effective particle fuelling efficiency is determined by a period of degraded confinement that follows the injection, during which the edge density collapses, in some cases, lower than the initial one. This phase is characterised by a dramatic change in the turbulent transport, with a drop of the frequency spectrum and the observation of large coherent structures as opposed to small intermittent fluctuations before the injection.