Zobrazeno 1 - 10
of 2 234
pro vyhledávání: '"Ku, S"'
Autor:
Dominski, J., Maget, P., Manas, O., Morales, J., Ku, S., Scheinberg, A., Chang, C. S., Hager, R., O'Mullane, M., team, the WEST
Tungsten peaking is predicted in the core of a WEST plasma with total-f gyrokinetic simulations, including both collisional and turbulent transport. This prediction is validated with a synthetic diagnostic of the bolometry. Although nitrogen impuriti
Externí odkaz:
http://arxiv.org/abs/2410.14432
The Special Euclidean group on the plane SE(2) has the left-invariant sub- Riemannian structure. Every sub-Riemannian manifold possesses a Hamiltonian function governing the sub-Riemannian geodesic flow. Two natural questions are: What are the necess
Externí odkaz:
http://arxiv.org/abs/2408.13873
Autor:
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.
Publikováno v:
Phys. Rev. Lett. 132, 235102 (2024)
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 do
Externí odkaz:
http://arxiv.org/abs/2403.00185
Publikováno v:
Phys. Rev. Lett. 133, 025101 (2024)
Gyrokinetic tokamak plasmas can exhibit intrinsic toroidal rotation driven by the residual stress. While most studies have attributed the residual stress to the parallel-momentum flux from the turbulent $\boldsymbol{E}\times\boldsymbol{B}$ motion, th
Externí odkaz:
http://arxiv.org/abs/2312.09516
Publikováno v:
Phys. Plasmas 31, 032303 (2024)
The application of a bundling technique to model the diverse charge states of tungsten impurity species in total-f gyrokinetic simulations is demonstrated. The gyrokinetic bundling method strategically groups tungsten ions of similar charge, optimizi
Externí odkaz:
http://arxiv.org/abs/2306.13145
Publikováno v:
Nucl. Fusion 63, 066009 (2023)
Ion orbit loss has been used to model the formation of a strong negative radial electric field $E_r$ in the tokamak edge, as well as edge momentum transport and toroidal rotation. To quantitatively measure ion orbit loss, an orbit-flux formulation ha
Externí odkaz:
http://arxiv.org/abs/2303.16006
Publikováno v:
Nucl. Fusion 62, 066012 (2020)
Ion orbit loss is considered important for generating the radially inward electric field $E_r$ in a tokamak edge plasma. In particular, this effect is emphasized in diverted tokamaks with a magnetic X point. In neoclassical equilibria, Coulomb collis
Externí odkaz:
http://arxiv.org/abs/2109.14758
Autor:
Sturdevant, Benjamin J., Ku, S., Chacón, L., Chen, Y., Hatch, D., Cole, M. D. J., Sharma, A. Y., Adams, M. F., Chang, C. S., Parker, S. E., Hager, R.
A fully implicit particle-in-cell method for handling the $v_\parallel$-formalism of electromagnetic gyrokinetics has been implemented in XGC. By choosing the $v_\parallel$-formalism, we avoid introducing the non-physical skin terms in Amp\`{e}re's l
Externí odkaz:
http://arxiv.org/abs/2106.06681
Autor:
Chang, C. S., Ku, S., Hager, R., Churchill, R. M., Hughes, J., Köchl, F., Loarte, A., Parail, V., Pitts, R.
Understanding and predicting divertor heat-load width ${\lambda}_q$ is a critically important problem for an easier and more robust operation of ITER with high fusion gain. Previous predictive simulation data for ${\lambda}_q$ using the extreme-scale
Externí odkaz:
http://arxiv.org/abs/2012.10750
Autor:
Charidakos, I. Keramidas, Myra, J. R., Ku, S., Churchill, R. M., Hager, R., Chang, C. S., Parker, S.
The physical processes taking place at the edge region are crucial for the operation of tokamaks as they govern the interaction of hot plasma with the vessel walls. Numerical modeling of the edge with state-of-the-art codes attempts to elucidate inte
Externí odkaz:
http://arxiv.org/abs/2003.11214