Remapping HELENA to incompressible plasma rotation parallel to the magnetic field

Journal Article · Fri Jul 15 04:00:00 EDT 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4955326· OSTI ID:22599997

Poulipoulis, G.; Throumoulopoulos, G. N. ^[1]; Konz, C. ^[2]

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1. Physics Department, University of Ioannina, Ioannina 451 10 (Greece)
2. Max-Planck Institut für Plasma Physics, 85748 Garching bei München (Germany)

Plasma rotation in connection to both zonal and mean (equilibrium) flows can play a role in the transitions to the advanced confinement regimes in tokamaks, as the L-H transition and the formation of internal transport barriers (ITBs). For incompressible rotation, the equilibrium is governed by a generalised Grad-Shafranov (GGS) equation and a decoupled Bernoulli-type equation for the pressure. For parallel flow, the GGS equation can be transformed to one identical in form with the usual Grad-Shafranov equation. In the present study on the basis of the latter equation, we have extended HELENA, an equilibrium fixed boundary solver. The extended code solves the GGS equation for a variety of the two free-surface-function terms involved for arbitrary Alfvén Mach number and density functions. We have constructed diverted-boundary equilibria pertinent to ITER and examined their characteristics, in particular, as concerns the impact of rotation on certain equilibrium quantities. It turns out that the rotation and its shear affect noticeably the pressure and toroidal current density with the impact on the current density being stronger in the parallel direction than in the toroidal one.

• OSTI ID: 22599997
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 7 Vol. 23; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CHARGED-PARTICLE TRANSPORT
CURRENT DENSITY
EQUILIBRIUM
GRAD-SHAFRANOV EQUATION
ITER TOKAMAK
MACH NUMBER
MAGNETIC FIELDS
PLASMA
PLASMA CONFINEMENT
ROTATING PLASMA
TRANSPORT THEORY