scholarly journals Burn Control of Magnetically Confined Fusion Plasma. 2. Burn Control in Tokamak Fusion Reactors. 2.1. Plasma Confinement and Burn Control.

1999 ◽  
Vol 75 (12) ◽  
pp. 1353-1359
Author(s):  
Atsushi FUKUYAMA ◽  
Masatoshi YAGI
Keyword(s):  
Fusion Reactors ◽  
Plasma Confinement ◽  
Fusion Plasma ◽  
Magnetically Confined

scholarly journals A new regime that “FIRE”s fusion plasmas for long sustained and high performance reactor conditions

2021 ◽  
Author(s):  
Yong-Su Na ◽  
Hyunsun Han ◽  
Sangjin Park ◽  
Jisung Kang ◽  
Young-Ho Lee ◽  
...  
Keyword(s):  
Steady State ◽  
High Performance ◽  
Large Scale ◽  
Fusion Reactor ◽  
Fusion Reactors ◽  
Fusion Plasmas ◽  
Ion Temperature ◽  
Plasma Confinement ◽  
Fusion Plasma ◽  
Steady State Operation

Abstract We report a discovery of a fusion plasma regime suitable for commercial fusion reactor where the ion temperature was sustained above 100 million degree about 20 s for the first time. Nuclear fusion as a promising technology for replacing carbon-dependent energy sources has currently many issues to be resolved to enable its large-scale use as a sustainable energy source. State-of-the-art fusion reactors cannot yet achieve the high levels of fusion performance, high temperature, and absence of instabilities required for steady-state operation for a long period of time on the order of hundreds of seconds. This is a pressing challenge within the field, as the development of methods that would enable such capabilities is essential for the successful construction of commercial fusion reactor. Here, a new plasma confinement regime called fast ion roled enhancement (FIRE) mode is presented. This mode is realized at Korea Superconducting Tokamak Advanced Research (KSTAR) and subsequently characterized to show that it meets most of the requirements for fusion reactor commercialization. Through a comparison to other well-known plasma confinement regimes, the favourable properties of FIRE mode are further elucidated and concluded that the novelty lies in the high fraction of fast ions, which acts to stabilize turbulence and achieve steady-state operation for up to 20 s by self-organization. We propose this mode as a promising path towards commercial fusion reactors.

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.

scholarly journals Testing of materials perspective for nuclear fusion reactors with inertial plasma confinement by Plasma Focus and laser devices

2019 ◽  
Vol 1347 ◽  
pp. 012071 ◽  
Author(s):  
V A Gribkov ◽  
E V Demina ◽  
E E Kazilin ◽  
S V Latyshev ◽  
S A Maslyaev ◽  
...  
Keyword(s):  
Plasma Focus ◽  
Nuclear Fusion ◽  
Fusion Reactors ◽  
Plasma Confinement ◽  
Laser Devices

Controlled Fusion: Plasma Confinement with Lasers

Science ◽  
1970 ◽  
Vol 169 (3948) ◽  
pp. 893-894 ◽  
Author(s):  
J. M. Thorne
Keyword(s):  
Plasma Confinement ◽  
Fusion Plasma ◽  
Controlled Fusion

scholarly journals Effect of a stochastic electric field on plasma confinement in FTU

2016 ◽  
Vol 31 (02) ◽  
pp. 1650005 ◽  
Author(s):  
Roberto Martorelli ◽  
Giovanni Montani ◽  
Nakia Carlevaro
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Electric Field ◽  
Uniform Magnetic Field ◽  
Planck Equation ◽  
Plasma Confinement ◽  
Stochastic Field ◽  
Magnetically Confined ◽  
The Magnetic Field ◽  
Plasma Profile

We discuss a stochastic model for the behavior of electrons in a magnetically confined plasma having axial symmetry. The aim of the work is to provide an explanation for the density limit observed in the Frascati Tokamak Upgrade (FTU) machine. The dynamical framework deals with an electron embedded in a stationary and uniform magnetic field and affected by an orthogonal random electric field. The behavior of the average plasma profile is determined by the appropriate Fokker–Planck equation associated to the considered model and the disruptive effects of the stochastic electric field are shown. The comparison between the addressed model and the experimental data allows to fix the relevant spatial scale of such a stochastic field. It is found to be of the order of the Tokamak micro-physics scale, i.e. few millimeters. Moreover, it is clarified how the diffusion process outlines a dependence on the magnetic field as [Formula: see text].

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