EC assisted plasma initiation has been applied successfully on different tokamaks, providing additional heating during pre-ionization of the prefill gas and during burn-through, although the influence of EC is different on the two phases. In case of ITER First Plasma, burn-through modelling suggests that the power absorption is limited at the second harmonic, even in multi-pass configuration. Clear research question: separate the effect, focusing on burn-through, and confirm predictions. Experiments have been carried out on ASDEX Upgrade: - ECH (X2) used after standard ohmic breakdown to limit the level of stray radiation - injection of neon impurity during pre-fill phase to mimic non-favorable condition such as would be expected in case of impurity influx from the wall - EC successfully sustains the burn-through of pre-filling gas with neon. Data used for modelling.
Development of ECRH-based methods for assisted discharge recovery: experiment and simulation
Ricci D;Figini L;Granucci G;
2022
Abstract
EC assisted plasma initiation has been applied successfully on different tokamaks, providing additional heating during pre-ionization of the prefill gas and during burn-through, although the influence of EC is different on the two phases. In case of ITER First Plasma, burn-through modelling suggests that the power absorption is limited at the second harmonic, even in multi-pass configuration. Clear research question: separate the effect, focusing on burn-through, and confirm predictions. Experiments have been carried out on ASDEX Upgrade: - ECH (X2) used after standard ohmic breakdown to limit the level of stray radiation - injection of neon impurity during pre-fill phase to mimic non-favorable condition such as would be expected in case of impurity influx from the wall - EC successfully sustains the burn-through of pre-filling gas with neon. Data used for modelling.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
