Real-time beam tracing for control of the deposition location of electron cyclotron waves

Reich, M.; Bilato, R.; Mszanowski, U.; Poli, E.; Rapson, C.; Stöber, J.; Volpe, F.; Zille, R.

doi:10.1016/j.fusengdes.2015.04.024

Cited by 28 publications

(27 citation statements)

References 22 publications

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“…The RAPTOR code has no constraint on the plasma scenario and can be used to model (and control) monotonic and advanced (e.g. reversed shear) q-profiles, using real-time estimates of the driven current from codes such as RT-TORBEAM for electron cyclotron heating [33,34] and RABBIT for NBI [35]. In advanced scenarios, it is important to follow and control the q-profile evolution close to the magnetic axis.…”

Section: Discussionmentioning

confidence: 99%

Optimal MSE polarisation angle and q-profile estimation using Kalman filters and the plasma simulator RAPTOR

Messmer

Felici

Sauter

et al. 2019

Plasma Phys. Control. Fusion

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Section: Discussionmentioning

confidence: 99%

Optimal MSE polarisation angle and q-profile estimation using Kalman filters and the plasma simulator RAPTOR

Messmer

Felici

Sauter

et al. 2019

Plasma Phys. Control. Fusion

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“…For example, a free-boundary equilibrium reconstruction of the Tokamak à Configuration Variable (TCV) in Lausanne, Switzerland, is evaluated in a fraction of a millisecond 13 , which satisfies the real-time control needs. Information on the plasma equilibrium is usually the key part of complex real-time control systems, such as that of the Axially Symmetric Divertor Experiment-Upgrade (ASDEX Upgrade) tokamak 14 in Garching, Germany, which includes real-time control of the microwave launcher for plasma heating and stabilization 15 . Fixed-boundary equilibrium codes, on the other hand, assume a given shape of the last closed flux surface and solve the Grad-Shafranov equation within this surface.…”

Section: Nature Physics Doi: 101038/nphys3744mentioning

confidence: 99%

Computational challenges in magnetic-confinement fusion physics

et al. 2016

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Magnetic-fusion plasmas are complex self-organized systems with an extremely wide range of spatial and temporal scales, from the electron-orbit scales (⇠10 11 s, ⇠10 5 m) to the di usion time of electrical current through the plasma (⇠10 2 s) and the distance along the magnetic field between two solid surfaces in the region that determines the plasma-wall interactions (⇠100 m). The description of the individual phenomena and of the nonlinear coupling between them involves a hierarchy of models, which, when applied to realistic configurations, require the most advanced numerical techniques and algorithms and the use of state-of-the-art high-performance computers. The common thread of such models resides in the fact that the plasma components are at the same time sources of electromagnetic fields, via the charge and current densities that they generate, and subject to the action of electromagnetic fields. This leads to a wide variety of plasma modes of oscillations that resonate with the particle or fluid motion and makes the plasma dynamics much richer than that of conventional, neutral fluids.T he most straightforward way for describing plasmas would be the microscopic particle approach: solving the equations of motion for the many individual particles that form the plasma in externally imposed electromagnetic fields and in the fields that the particles themselves generate. However, this is computationally impossible to apply to realistic magnetic-fusion plasmas, which typically contain 10 22 -10 23 particles. (For a review of the basic concepts of magnetically confined fusion plasmas, see ref. 1.)A statistical treatment leads to the kinetic model, based on the Vlasov equation (equation (1)), essentially Liouville's theorem applied to the specific plasma environment, with interactions that are dominated by electromagnetic fields and a separation between particle collisions -that is, interactions at microscopic scales-and long-range fields. The Vlasov equation describes the evolution of f s (x,v,t), the single-particle phase-space distribution function of the species labelled 's' (electrons or ions), under the e ect of the longrange electric and magnetic fields E and B, which evolve according to Maxwell's equations with plasma charge and current densities as sources:Here, x, v, q s and m s stand for the position, velocity, charge and the mass of a particle of species 's' , respectively. In the Vlasov model, collisions are neglected, an approximation that is generally justified for fusion plasmas because small-scale e ects based on Coulomb interactions become very weak at high temperatures. In fact, Coulomb collisions' cross-sections for the exchange of momentum and energy, and related quantities such as the electrical resistivity ⌘, scale with T 3/2 . In ITER core plasmas (see ref. 1), for example, T ⇡ 10 keV (⇡10 8 K) and the electron-electron ('ee'), electron-ion ('ei') and ion-ion ('ii') collisional exchanges of momentum and energy ('E') occur over relatively long characteristic times:2)-justifying the collisi...

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“…A real-time version of the TORBEAM code provides the deposition position of ECH well within 3 % of the actual position. [7] On the ASDEX Upgrade tokamak, magnetic islands have been controlled using mode detection and deposition control. [8][9]…”

Section: Pos(ecpd2015)002mentioning

confidence: 99%

Combined Electron Cyclotron Emission And Heating For The Suppression Of Neoclassical Tearing Modes In Fusion Plasmas

Brand¹,

Baar²,

Hennen³

et al. 2016

Proceedings of 1st EPS Conference on Plasma Diagnostics — PoS(ECPD2015)

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Real-time beam tracing for control of the deposition location of electron cyclotron waves

Cited by 28 publications

References 22 publications

Optimal MSE polarisation angle and q-profile estimation using Kalman filters and the plasma simulator RAPTOR

Optimal MSE polarisation angle and q-profile estimation using Kalman filters and the plasma simulator RAPTOR

Computational challenges in magnetic-confinement fusion physics

Combined Electron Cyclotron Emission And Heating For The Suppression Of Neoclassical Tearing Modes In Fusion Plasmas

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