Discrepancies in magnetic field maps produced by confinement coils in thermonuclear fusion reactors may drive plasma to loss of stability, and must be carefully controlled during the whole time evolution of each shot using suitable correction coils. Even when kept below safety thresholds, these error fields may alter the geometry of magnetic flux lines, defining the plasma geometry. The present paper, using high accuracy 3D magnetic field computations for confinement coils, addresses the issue of evaluating the effect of error fields on the plasma boundary shape during the shot, modeled as a sequence of equilibrium configurations. In particular, a procedure able to compute the shape perturbations due to given deformations of the coils has been set up and used to carry out an analysis of relationship between the error field and shape perturbations during the time evolution of ITER programmed scenario.
Error Field Impact on Plasma Boundary in ITER Scenarios
FORMISANO, Alessandro;MARTONE, Raffaele;
2015
Abstract
Discrepancies in magnetic field maps produced by confinement coils in thermonuclear fusion reactors may drive plasma to loss of stability, and must be carefully controlled during the whole time evolution of each shot using suitable correction coils. Even when kept below safety thresholds, these error fields may alter the geometry of magnetic flux lines, defining the plasma geometry. The present paper, using high accuracy 3D magnetic field computations for confinement coils, addresses the issue of evaluating the effect of error fields on the plasma boundary shape during the shot, modeled as a sequence of equilibrium configurations. In particular, a procedure able to compute the shape perturbations due to given deformations of the coils has been set up and used to carry out an analysis of relationship between the error field and shape perturbations during the time evolution of ITER programmed scenario.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
