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pro vyhledávání: '"Roach, C"'
Electromagnetic microtearing modes (MTMs) have been observed in many different spherical tokamak regimes. Understanding how these and other electromagnetic modes nonlinearly saturate is likely critical in understanding the confinement of a high $\bet
Externí odkaz:
http://arxiv.org/abs/2409.08216
Autor:
Giacomin, M., Dickinson, D., Dorland, W., Mandell, N. R., Bokshi, A., Casson, F. J., Dudding, H. G., Kennedy, D., Patel, B. S., Roach, C. M.
A quasi-linear reduced transport model is developed from a database of high-$\beta$ electromagnetic nonlinear gyrokinetic simulations performed with Spherical Tokamak for Energy Production (STEP) relevant parameters. The quasi-linear model is fully e
Externí odkaz:
http://arxiv.org/abs/2404.17453
Autor:
Tholerus, E., Casson, F. J., Marsden, S. P., Wilson, T., Brunetti, D., Fox, P., Freethy, S. J., Hender, T. C., Henderson, S. S., Hudoba, A., Kirov, K. K., Koechl, F., Meyer, H., Muldrew, S. I., Olde, C., Patel, B. S., Roach, C. M., Saarelma, S., Xia, G.
STEP is a spherical tokamak prototype power plant that is being designed to demonstrate net electric power. The design phase involves the exploitation of plasma models to optimise fusion performance subject to satisfying various physics and engineeri
Externí odkaz:
http://arxiv.org/abs/2403.09460
Autor:
Kennedy, D., Roach, C. M., Giacomin, M., Ivanov, P., Adkins, T., Sheffield, F., örler, T. G, Bokshi, A., Dickinson, D., Dudding, H. G., Patel, B. S.
[ABRIDGED] This paper discusses the importance of parallel perturbations of the magnetic-field in gyrokinetic simulations of electromagnetic instabilities and turbulence at mid-radius in the burning plasma phase of the conceptual high-$\beta$, reacto
Externí odkaz:
http://arxiv.org/abs/2402.10583
Publikováno v:
Plasma Phys. Control. Fusion 65 095019 (2023)
First nonlinear gyrokinetic simulations of microtearing modes in the core of a MAST case are performed on two surfaces of the high-collisionality discharge used in Valovi\v{c} et al. Nucl. Fusion 51.7 (2011) to obtain the favorable energy confinement
Externí odkaz:
http://arxiv.org/abs/2303.02379
Autor:
Hardman, M. R., Parra, F. I., Patel, B. S., Roach, C. M., Ruiz, J. Ruiz, Barnes, M., Dickinson, D., Dorland, W., Parisi, J. F., St-Onge, D., Wilson, H.
In magnetic confinement fusion devices, the ratio of the plasma pressure to the magnetic field energy, $\beta$, can become sufficiently large that electromagnetic microinstabilities become unstable, driving turbulence that distorts or reconnects the
Externí odkaz:
http://arxiv.org/abs/2208.10615
Autor:
Parisi, J. F., Parra, F. I., Roach, C. M., Hardman, M. R., Schekochihin, A. A., Abel, I. G., Aiba, N., Ball, J., Barnes, M., Chapman-Oplopoiou, B., Dickinson, D., Dorland, W., Giroud, C., Hatch, D. R., Hillesheim, J. C., Ruiz, J. Ruiz, Saarelma, S., St-Onge, D.
Nonlinear multiscale gyrokinetic simulations of a Joint European Torus edge pedestal are used to show that electron-temperature-gradient (ETG) turbulence has a rich three-dimensional structure, varying strongly according to the local magnetic-field c
Externí odkaz:
http://arxiv.org/abs/2203.00831
Electromagnetic (EM) instabilities and turbulence driven by the electron-temperature gradient are considered in a local slab model of a tokamak-like plasma. The model describes perturbations at scales both larger and smaller than the flux-freezing sc
Externí odkaz:
http://arxiv.org/abs/2201.05670