Zobrazeno 1 - 10
of 333
pro vyhledávání: '"Dickinson, D. P."'
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 $\bet
Externí odkaz:
http://arxiv.org/abs/2409.08216
Autor:
Jacobson-Galán, W. V., Davis, K. W., Kilpatrick, C. D., Dessart, L., Margutti, R., Chornock, R., Foley, R. J., Arunachalam, P., Auchettl, K., Bom, C. R., Cartier, R., Coulter, D. A., Dimitriadis, G., Dickinson, D., Drout, M. R., Gagliano, A. T., Gall, C., Garretson, B., Izzo, L., Jones, D. O., LeBaron, N., Miao, H. -Y., Milisavljevic, D., Pan, Y. -C., Rest, A., Rojas-Bravo, C., Santos, A., Sears, H., Subrayan, B. M., Taggart, K., Tinyanont, S.
We present UV/optical/NIR observations and modeling of supernova (SN) 2024ggi, a type II supernova (SN II) located in NGC 3621 at 7.2 Mpc. Early-time ("flash") spectroscopy of SN 2024ggi within +0.8 days of discovery shows emission lines of H I, He I
Externí odkaz:
http://arxiv.org/abs/2404.19006
Autor:
Giacomin, M., Dickinson, D., Dorland, W., Mandell, N. R., Bokshi, A., Casson, F. J., Dudding, H. G., Kennedy, D., Patel, B. S., Roach, C. M.
A quasi-linear reduced transport model is developed from a database of high-$\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:
Parisi, J. F., Berkery, J. W., Sladkomedova, A., Guizzo, S., Hardman, M. R., Ball, J. R., Nelson, A. O., Kaye, S. M., Anastopoulos-Tzanis, M., McNamara, S. A. M., Dominski, J., Janhunen, S., Romanelli, M., Dickinson, D., Diallo, A., Dnestrovskii, A., Guttenfelder, W., Hansen, C., Myatra, O., Wilson, H. R.
A new burn control scheme for tokamaks is described where the total fusion power is controlled by adjusting the plasma volume fraction that is packed into power dense regions. In an example spherical tokamak burning plasma, by modifying the plasma ed
Externí odkaz:
http://arxiv.org/abs/2404.04387
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
Spherical tokamaks (STs) have been shown to possess properties desirable for a fusion power plant such as achieving high plasma ? and having increased vertical stability. To understand the confinement properties that might be expected in the conceptu
Externí odkaz:
http://arxiv.org/abs/2108.11169
Autor:
Hardman, M. R., Parra, F. I., Chong, C., Adkins, T., Anastopoulos-Tzanis, M. S., Barnes, M., Dickinson, D., Parisi, J. F., Wilson, H.
Ion-gyroradius-scale microinstabilities typically have a frequency comparable to the ion transit frequency. Due to the small electron-to-ion mass ratio and the large electron transit frequency, it is conventionally assumed that passing electrons resp
Externí odkaz:
http://arxiv.org/abs/2108.02822