Plasma-Wall Interaction in Magnetically Confined Fusion Plasmas

2010 ◽  
Vol 57 (2T) ◽  
pp. 241-246 ◽  
Author(s):  
U. Samm
Keyword(s):  
Fusion Plasmas ◽  
Magnetically Confined ◽  
Wall Interaction

scholarly journals On the accuracy of the binary-collision algorithm in particle-in-cell simulations of magnetically confined fusion plasmas

2021 ◽  
Vol 87 (2) ◽  
Author(s):  
Timo P. Kiviniemi ◽  
Eero Hirvijoki ◽  
Antti J. Virtanen
Keyword(s):  
Finite Difference ◽  
Electric Fields ◽  
Finite Size ◽  
Binary Collision ◽  
Conserved Quantities ◽  
Fusion Plasmas ◽  
Fusion Plasma ◽  
Particle In Cell ◽  
Magnetically Confined ◽  
Scale Length

Ideally, binary-collision algorithms conserve kinetic momentum and energy. In practice, the finite size of collision cells and the finite difference in the particle locations affect the conservation properties. In the present work, we investigate numerically how the accuracy of these algorithms is affected when the size of collision cells is large compared with gradient scale length of the background plasma, a parameter essential in full- $f$ fusion plasma simulations. Additionally, we discuss implications for the conserved quantities in drift-kinetic formulations when fluctuating magnetic and electric fields are present: we suggest how the accuracy of the algorithms could potentially be improved with minor modifications.

Observations of the ultraviolet and x-ray brightness profiles and cooling rates of Kr and Ar in magnetically confined fusion plasmas

2000 ◽  
Vol 61 (3) ◽  
pp. 3042-3052 ◽  
Author(s):  
M. May ◽  
K. Fournier ◽  
D. Pacella ◽  
H. Kroegler ◽  
J. Rice ◽  
...  
Keyword(s):  
Fusion Plasmas ◽  
Cooling Rates ◽  
X Ray ◽  
Magnetically Confined

scholarly journals Impurity transport and bulk ion flow in a mixed collisionality stellarator plasma

2017 ◽  
Vol 83 (5) ◽  
Author(s):  
S. L. Newton ◽  
P. Helander ◽  
A. Mollén ◽  
H. M. Smith
Keyword(s):  
Fusion Energy ◽  
Effect Of Temperature ◽  
Fusion Plasmas ◽  
Ion Flow ◽  
Confined Plasmas ◽  
Impurity Species ◽  
Magnetically Confined ◽  
Bootstrap Current ◽  
Magnetically Confined Plasmas ◽  
Bulk Plasma

The accumulation of impurities in the core of magnetically confined plasmas, resulting from standard collisional transport mechanisms, is a known threat to their performance as fusion energy sources. Whilst the axisymmetric tokamak systems have been shown to benefit from the effect of temperature screening, that is an outward flux of impurities driven by the temperature gradient, impurity accumulation in stellarators was thought to be inevitable, driven robustly by the inward pointing electric field characteristic of hot fusion plasmas. We have shown in Helander et al. (Phys. Rev. Lett., vol. 118, 2017a, 155002) that such screening can in principle also appear in stellarators, in the experimentally relevant mixed collisionality regime, where a highly collisional impurity species is present in a low collisionality bulk plasma. Details of the analytic calculation are presented here, along with the effect of the impurity on the bulk ion flow, which will ultimately affect the bulk contribution to the bootstrap current.

scholarly journals Energetic particle acceleration and transport by Alfvén/acoustic waves in tokamak-like Solar flares

2010 ◽  
Vol 6 (S274) ◽  
pp. 162-164
Author(s):  
Martin Obergaulinger ◽  
Manuel García-Muñoz
Keyword(s):  
Solar Flares ◽  
Acoustic Waves ◽  
Energetic Particle ◽  
Fusion Plasmas ◽  
Experimental Phase ◽  
Astrophysical Plasmas ◽  
Energetic Ions ◽  
Laboratory Plasmas ◽  
Magnetically Confined ◽  
Particle Exchange

AbstractAlfven/acoustic waves are ubiquitous in astrophysical as well as in laboratory plasmas. Their interplay with energetic ions is of crucial importance to understanding the energy and particle exchange in astrophysical plasmas as well as to obtaining a viable energy source in magnetically confined fusion devices. In magnetically confined fusion plasmas, an experimental phase-space characterisation of convective and diffusive energetic particle losses induced by Alfven/acoustic waves allows for a better understanding of the underlying physics. The relevance of these results in the problem of the anomalous heating of the solar corona is checked by MHD simulations of Tokamak-like Solar flare tubes.

Spatially resolved high resolution x-ray spectroscopy for magnetically confined fusion plasmas (invited)

2008 ◽  
Vol 79 (10) ◽  
pp. 10E302 ◽  
Author(s):  
A. Ince-Cushman ◽  
J. E. Rice ◽  
M. Bitter ◽  
M. L. Reinke ◽  
K. W. Hill ◽  
...  
Keyword(s):  
High Resolution ◽  
Fusion Plasmas ◽  
X Ray ◽  
Spatially Resolved ◽  
Magnetically Confined
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