Zobrazeno 1 - 10
of 327
pro vyhledávání: '"Kotschenreuther, M"'
The flux coordinates with dual-region safety factor (q) in the poloidal direction are developed in this work. The X-point effects on the ideal MHD modes in tokamaks are then analyzed using this coordinate system. Since the X-point effects mainly affe
Externí odkaz:
http://arxiv.org/abs/2411.00194
Recent data, added to the ITPA global H-mode database [1] for ASDEX-U [2] and JET-ILW, reveals that the separatrix density $n_{sep}$ has a correlation with the H20 factor (Confinement time relative to the ITPA20-IL scaling)[1]. These trends are analy
Externí odkaz:
http://arxiv.org/abs/2406.15693
Autor:
Zheng, Linjin, Kotschenreuther, M. T., Waelbroeck, F. L., Austin, M. E., Rowan, W. L., Valanju, P., Liu, X.
The steady-state confinement, beta limit, and divertor heat load are among the most concerned issues for toroidal confinement of fusion plasmas. In this work, we show that the negative triangularity tokamak has promising prospects to address these is
Externí odkaz:
http://arxiv.org/abs/2401.15488
The free energy balance equation for gyrokinetic fluctuations is derived and applied to instabilities. An additional term due to electromagnetic sources is included. This can provide a simpler way to compute the free energy balance in practical appli
Externí odkaz:
http://arxiv.org/abs/2310.11624
Autor:
Hatch, D. R., Kotschenreuther, M. T., Li, P. -Y., Chapman-Oplopoiou, B., Parisi, J., Mahajan, S. M., Groebner, R.
This paper reports on the refinement (building on Ref.~\cite{hatch_22}) and application of simple formulas for electron heat transport from electron temperature gradient (ETG) driven turbulence in the pedestal. The formulas are improved by (1) improv
Externí odkaz:
http://arxiv.org/abs/2309.10708
Publikováno v:
Physics of Plasmas 29, 072503 (2022)
A radially adaptive numerical scheme is developed to solve the Grad-Shafranov equation for axisymmetric magnetohydrodynamic equilibrium. A decomposition with independent solutions is employed in the radial direction and Fourier decomposition is used
Externí odkaz:
http://arxiv.org/abs/2301.02369
Autor:
Curie, M. T., Hatch, D. R., Halfmoon, M., Chen, J., Brower, D. L., Hassan, E., Kotschenreuther, M., Mahajan, S. M., Groebner, R. J.
Experimental data on electromagnetic fluctuations in DIII-D, made available by the Faraday-effect Radial Interferometer-Polarimeter (RIP) diagnostic, is examined in comparison with detailed gyrokinetic simulations using Gyrokinetic Electromagnetic Nu
Externí odkaz:
http://arxiv.org/abs/2208.13845
Autor:
Kotschenreuther, M.
Gyrokinetic turbulence is subject to the constraint that the turbulent charge flux vanishes. This is interpreted, in detail, as arising from momentum conservation at the fluctuation scale. There are beautiful and deep analogies with the classical tra
Externí odkaz:
http://arxiv.org/abs/2104.03828
Autor:
Hatch, D. R., Kotschenreuther, M., Mahajan, S. M., Pueschel, M. J., Michoski, C., Merlo, G., Hassan, E., Field, A. R., Frassinetti, L., Giroud, C., Hillesheim, J. C., Maggi, C. F., von Thun, C. Perez, Roach, C. M., Saarelma, S., Jarema, D., Jenko, F., contributors, JET
We report on a detailed study of magnetic fluctuations in the JET pedestal, employing basic theoretical considerations, gyrokinetic simulations, and experimental fluctuation data, to establish the physical basis for their origin, role, and distinctiv
Externí odkaz:
http://arxiv.org/abs/2007.07332
Naturally stable to ELMs, and with widths larger than EPED predictions, the I-modes are an excellent laboratory for investigating the role of drift micro-instabilities in pedestals since I-mode pedestal are not "limited" by MHD instabilities. We pres
Externí odkaz:
http://arxiv.org/abs/2005.08924