Inward particle transport at high collisionality in the Experimental Advanced Superconducting Tokamak

Journal Article · Tue Oct 15 00:00:00 EDT 2013 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4826975· OSTI ID:22218525

Wang, G. Q.; Ma, J. ^[1]; Weiland, J.; Zang, Q. ^[1]

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1. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031 (China)

We have made the first drift wave study of particle transport in the Experimental Advanced Superconducting Tokamak (Wan et al., Nucl. Fusion 49, 104011 (2009)). The results reveal that collisions make the particle flux more inward in the high collisionality regime. This can be traced back to effects that are quadratic in the collision frequency. The particle pinch is due to electron trapping which is not very efficient in the high collisionality regime so the approach to equilibrium is slow. We have included also the electron temperature gradient (ETG) mode to give the right electron temperature gradient, since the Trapped Electron Mode (TE mode) is weak in this regime. However, at the ETG mode number ions are Boltzmann distributed so the ETG mode does not give particle transport.

• OSTI ID: 22218525
• Journal Information: Physics of Plasmas, Vol. 20, Issue 10; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CHARGED-PARTICLE TRANSPORT
ELECTRON TEMPERATURE
HT-7U TOKAMAK
ION TEMPERATURE
IONS
PINCH EFFECT
PLASMA CONFINEMENT
PLASMA DRIFT
PLASMA INSTABILITY
TEMPERATURE GRADIENTS
TRAPPED ELECTRONS
TRAPPING
TRAPS
WAVE PROPAGATION