Ion heat transport studies in JET
- 14 November 2011
- journal article
- conference paper
- Published by IOP Publishing in Plasma Physics and Controlled Fusion
- Vol. 53 (12)
- https://doi.org/10.1088/0741-3335/53/12/124033
Abstract
Detailed experimental studies of ion heat transport have been carried out in JET exploiting the upgrade of active charge exchange spectroscopy and the availability of multi-frequency ion cyclotron resonance heating with He-3 minority. The determination of ion temperature gradient (ITG) threshold and ion stiffness offers unique opportunities for validation of the well-established theory of ITG driven modes. Ion stiffness is observed to decrease strongly in the presence of toroidal rotation when the magnetic shear is sufficiently low. This effect is dominant with respect to the well-known omega(ExB) threshold up-shift and plays a major role in enhancing core confinement in hybrid regimes and ion internal transport barriers. The effects of T-e/T-i and s/q on ion threshold are found rather weak in the domain explored. Quasi-linear fluid/gyro-fluid and linear/non-linear gyro-kinetic simulations have been carried out. Whilst threshold predictions show good match with experimental observations, some significant discrepancies are found on the stiffness behaviour.Keywords
This publication has 45 references indexed in Scilit:
- JET (3He)–D scenarios relying on RF heating: survey of selected recent experimentsPlasma Physics and Controlled Fusion, 2009
- Impact of calibration technique on measurement accuracy for the JET core charge-exchange systemReview of Scientific Instruments, 2008
- Chapter 1: The Birth of JETFusion Science and Technology, 2008
- Electron heat transport studiesPlasma Physics and Controlled Fusion, 2006
- Perturbative studies of turbulent transport in fusion plasmasComptes Rendus Physique, 2006
- Quantitative predictions of tokamak energy confinement from first-principles simulations with kinetic effectsPhysics of Plasmas, 1995
- Survey of theories of anomalous transportPlasma Physics and Controlled Fusion, 1994
- Properties of ion temperature gradient drift instabilities in H-mode plasmasPhysics of Fluids B: Plasma Physics, 1989
- Ion temperature-gradient-driven modes and anomalous ion transport in tokamaksPhysics of Fluids B: Plasma Physics, 1989
- Momentum and thermal transport in neutral-beam-heated tokamaksPhysics of Fluids, 1988