2019
DOI: 10.1088/1361-6587/ab4376
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Intrinsic rotation in axisymmetric devices

Abstract: Toroidal rotation is critical for fusion in tokamaks, since it stabilizes instabilities that can otherwise cause disruptions or degrade confinement. Unlike present-day devices, ITER might not have enough neutral-beam torque to easily avoid these instabilities. We must therefore understand how the plasma rotates 'intrinsically,' that is, without applied torque. Experimentally, torque-free plasmas indeed rotate, with profiles that are often non-flat and even non-monotonic. The rotation depends on many plasma par… Show more

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Cited by 25 publications
(33 citation statements)
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“…The ion orbit loss mechanism [13,14,12,55,3,6] refers to the idea that ion orbits close to the Xpoint end on the divertor target or the vessel wall and are thus lost to the confined plasma region. It is thought that the poloidal magnetic field close to the X-point is small such that the grad-B curvature drift velocity dominates over the parallel velocity making ions drift across the separatrix.…”
Section: Relation To the Ion Orbit Loss Mechanismmentioning
confidence: 99%
See 1 more Smart Citation
“…The ion orbit loss mechanism [13,14,12,55,3,6] refers to the idea that ion orbits close to the Xpoint end on the divertor target or the vessel wall and are thus lost to the confined plasma region. It is thought that the poloidal magnetic field close to the X-point is small such that the grad-B curvature drift velocity dominates over the parallel velocity making ions drift across the separatrix.…”
Section: Relation To the Ion Orbit Loss Mechanismmentioning
confidence: 99%
“…Studies of toroidal rotation favour the toroidally symmetric tokamak case, where the symmetry leads to the exact conservation of the collective ‡ canonical angular momentum [1,2,3]. Of particular interest is the so-called intrinsic rotation, which refers to the ability of the plasma to spontaneously rotate without application of an external torque like neutral beam injection [4,5,6]. This is an important topic because toroidal rotation stabilizes the plasma against instabilities like the resistive wall mode.…”
Section: Introductionmentioning
confidence: 99%
“…This symmetry breaking mechanism can have comparable contributions from the radial variation of density and temperature and of their gradients. Note that the profile shearing effect is related to the global model, several efforts have focused on developing local mock-ups of the global, radial profile shear effects, typically based on some extension of the ballooning formalism for high k ⊥ instabilities (Connor, Hastie & Taylor 1979;Dewar & Glasser 1983;Stoltzfus-Dueck 2019). In local simulations the profile shear effect can be replaced by the poloidal tilt angle θ which is the tilt of maximum turbulence intensity at the outboard midplane and can be related to ballooning angle θ 0 .…”
Section: Wang and Othersmentioning
confidence: 99%
“…The topic of an exact gyrokinetic momentum conservation law gained crucial importance in the context of the momentum transport (Waltz et al 2007; Parra & Catto 2010 a ; Abiteboul et al 2011; Peeters et al 2011) and intrinsic toroidal rotation (Wang, Peng & Diamond 2018; Stoltzfus-Dueck 2019) in axisymmetric tokamak plasmas. In particular, the phenomenon of intrinsic toroidal rotation, which is observed in the absence of external torque, must be investigated within the context of toroidal angular momentum conservation.…”
Section: Introductionmentioning
confidence: 99%