Broadening of the Divertor Heat Flux Profile in High Confinement Tokamak Fusion Plasmas with Edge Pedestals Limited by Turbulence in DIII-D
arxiv(2024)
摘要
Multi-machine empirical scaling predicts an extremely narrow heat exhaust
layer in future high magnetic field tokamaks, leading to disastrous material
erosion. In the experiments presented, the width of this exhaust layer is
nearly doubled by using actuators to increase turbulent transport in the plasma
edge. This is achieved in low collisionality, high confinement edge pedestals
with their gradients limited by turbulent transport instead of large-scale,
coherent instabilities. The exhaust heat flux profile width and divertor leg
diffusive spreading both double as a high frequency band of fluctuations
propagating in the electron diamagnetic direction doubles in amplitude. The
results are quantitatively reproduced in comprehensive electromagnetic XGC
particle-in-cell simulations which show the heat flux carried by electrons
emerges to broaden the heat flux profile.
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