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Publikováno v:
Journal of Plasma Physics, 84, 725840301, (2018)
Starting from expressions in Connor et al. (1988) [1], we derive a one-dimensional tearing equation similar to the approximate equation obtained by Hegna and Callen (1984) [2] and by Nishimura et al (1998) [3], but for more realistic toroidal equilib
Externí odkaz:
http://arxiv.org/abs/1805.03915
Optimised stellarators and other magnetic-confinement devices having the property that the average magnetic curvature is favourable for all particle orbits are called maximum-$J$ devices, and have recently been shown to be immune to trapped-particle
Externí odkaz:
http://arxiv.org/abs/1708.04085
Autor:
Helander, Per, Connor, J. W.
Publikováno v:
Journal of Plasma Physics, Volume 82, Issue 03, June 2016, 905820301
The linear gyrokinetic stability properties of magnetically confined electron-positron plasmas are investigated in the parameter regime most likely to be relevant for the first laboratory experiments involving such plasmas, where the density is small
Externí odkaz:
http://arxiv.org/abs/1606.04656
Publikováno v:
2016 Plasma Phys. Control. Fusion 58 085002
An explanation of the observed improvement in H-mode pedestal characteristics with increasing core plasma pressure or poloidal beta, as observed in MAST and JET, is sought in terms of the impact of the Shafranov shift, d', on ideal ballooning MHD sta
Externí odkaz:
http://arxiv.org/abs/1603.08416
Publikováno v:
Phys. Rev. Lett. 108, 245002 (2012)
It is shown that in perfectly quasi-isodynamic stellarators, trapped particles with a bounce frequency much higher than the frequency of the instability are stabilizing in the electrostatic and collisionless limit. The collisionless trapped-particle
Externí odkaz:
http://arxiv.org/abs/1509.04185
The electromagnetic theory of the strongly driven ion-temperature-gradient (ITG) instability in magnetically confined toroidal plasmas is developed. Stabilizing and destabilizing effects are identified, and a critical $\beta_{e}$ (the ratio of the el
Externí odkaz:
http://arxiv.org/abs/1502.05869
Publikováno v:
Plasma Physics and Controlled Fusion, Vol.57, No.6, June 2015, pp.065001
The role of anisotropic thermal diffusivity on tearing mode stability is analysed in general toroidal geometry. A dispersion relation linking the growth rate to the tearing mode stability parameter, Delta, is derived. By using a resistive MHD code, m
Externí odkaz:
http://arxiv.org/abs/1410.7240
The global ideal kink equation, for cylindrical geometry and zero beta, is simplified in the high poloidal mode number limit and used to determine the tearing stability parameter, $\Delta^\prime$. In the presence of a steep monotonic current gradient
Externí odkaz:
http://arxiv.org/abs/1409.7671
Publikováno v:
Phys. Plasmas 21, 032112 (2014)
We investigate the linear theory of the ion-temperature-gradient (ITG) mode, with the goal of developing a general understanding that may be applied to stellarators. We highlight the Wendelstein 7X (W7-X) device. Simple fluid and kinetic models that
Externí odkaz:
http://arxiv.org/abs/1312.2424