1,721,112 research outputs found
An analytical demonstration of coupling schemes between magnetohydrodynamic codes and eddy current codes
No full textIn order to model a magnetohydrodynamic (MHD) instability that strongly couples to external conducting structures (walls and/or coils) in a fusion device, it is often necessary to combine a MHD code solving for the plasma response, with an eddy current code computing the fields and currents of conductors. We present a rigorous proof of the coupling schemes between these two types of codes. One of the coupling schemes has been introduced and implemented in the CARMA code {[}R. Albanese, Y. Q. Liu, A. Portone, G. Rubinacci, and F. Villone, IEEE Trans. Magn. 44, 1654 (2008); A. Portone, F. Villone, Y. Q. Liu, R. Albanese, and G. Rubinacci, Plasma Phys. Controlled Fusion 50, 085004 (2008)] that couples the MHD code MARS-F {[}Y. Q. Liu, A. Bondeson, C. M. Fransson, B. Lennartson, and C. Breitholtz, Phys. Plasmas 7, 3681 (2000)] and the eddy current code CARIDDI {[}R. Albanese and G. Rubinacci, Adv. Imaging Electron Phys. 102, 1 (1998)]. While the coupling schemes are described for a general toroidal geometry, we give the analytical proof for a cylindrical plasma
Electromagnetic Analysis of Plasma Facing Components in a Fusion Reactor Using Fully 3D Models and Thin Shell Approximations
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Assessment of the Accuracy of Electromagnetic Field Calculations for non Destructive Testing
No full textVarious stochastic techniques, applied to solve inverse identification problems, require the generation of extensive databases obtained via numerical analysis of the corresponding direct problems. We focus on the problem of the accuracy of the electromagnetic computation. This is a critical issue in the context of the magnetostatic and eddy current NDT techniques, because the quantities of interest are often the difference between two close values. We first discuss the calibration of the numerical results, a technique that can be applied to nonlinear problems and reduces to superposition in the linear case. Linear problems possess several properties that can be exploited when performing numerical analysis. Finally, we discuss the question of error estimation. It is well known that the constitutive error approach provides bounds for global electromagnetic quantities. We show that upper and lower bounds are also available for local quantities in the linear case
Problemi di elettromagnetismo nello studio di dispositivi per la fusione termonucleare controllata
No full textNumerical Results on the MHD Stability of the INTOR Plasma to Vertical Axisymmetrix Displacements
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