Broadening of the Divertor Heat Flux Profile in High Confinement Tokamak Fusion Plasmas with Edge Pedestals Limited by Turbulence in DIII-D

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Bibliographische Detailangaben
Hauptverfasser:	Ernst, D. R., Bortolon, A., Chang, C. S., Ku, S., Scotti, F., Wang, H. Q., Yan, Z., Chen, Jie, Chrystal, C., Glass, F., Haskey, S., Hood, R., Khabanov, F., Laggner, F., Lasnier, C., McKee, G. R., Rhodes, T. L., Truong, D., Watkins, J.
Format:	Preprint
Veröffentlicht:	2024
Schlagworte:	Plasma Physics
Online-Zugang:	Acceder al recurso
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_version_	1866909278714986496
author	Ernst, D. R. Bortolon, A. Chang, C. S. Ku, S. Scotti, F. Wang, H. Q. Yan, Z. Chen, Jie Chrystal, C. Glass, F. Haskey, S. Hood, R. Khabanov, F. Laggner, F. Lasnier, C. McKee, G. R. Rhodes, T. L. Truong, D. Watkins, J.
author_facet	Ernst, D. R. Bortolon, A. Chang, C. S. Ku, S. Scotti, F. Wang, H. Q. Yan, Z. Chen, Jie Chrystal, C. Glass, F. Haskey, S. Hood, R. Khabanov, F. Laggner, F. Lasnier, C. McKee, G. R. Rhodes, T. L. Truong, D. Watkins, J.
contents	Multi-machine empirical scaling predicts an extremely narrow heat exhaust layer in future high magnetic field tokamaks, producing high power densities that require mitigation. In the experiments presented, the width of this exhaust layer is nearly doubled 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 turbulent fluctuations propagating in the electron diamagnetic direction doubles in amplitude. The results are quantitatively reproduced in electromagnetic XGC particle-in-cell simulations which show the heat flux carried by electrons emerges to broaden the heat flux profile, directly supported by Langmuir probe measurements.
format	Preprint
id	arxiv_https___arxiv_org_abs_2403_00185
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	Broadening of the Divertor Heat Flux Profile in High Confinement Tokamak Fusion Plasmas with Edge Pedestals Limited by Turbulence in DIII-D Ernst, D. R. Bortolon, A. Chang, C. S. Ku, S. Scotti, F. Wang, H. Q. Yan, Z. Chen, Jie Chrystal, C. Glass, F. Haskey, S. Hood, R. Khabanov, F. Laggner, F. Lasnier, C. McKee, G. R. Rhodes, T. L. Truong, D. Watkins, J. Plasma Physics Multi-machine empirical scaling predicts an extremely narrow heat exhaust layer in future high magnetic field tokamaks, producing high power densities that require mitigation. In the experiments presented, the width of this exhaust layer is nearly doubled 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 turbulent fluctuations propagating in the electron diamagnetic direction doubles in amplitude. The results are quantitatively reproduced in electromagnetic XGC particle-in-cell simulations which show the heat flux carried by electrons emerges to broaden the heat flux profile, directly supported by Langmuir probe measurements.
title	Broadening of the Divertor Heat Flux Profile in High Confinement Tokamak Fusion Plasmas with Edge Pedestals Limited by Turbulence in DIII-D
topic	Plasma Physics
url	https://arxiv.org/abs/2403.00185