Runaway electron dynamics in tokamak plasmas with high impurity content

2015 ◽  
Vol 22 (9) ◽  
pp. 092512 ◽  
Author(s):  
J. R. Martín-Solís ◽  
A. Loarte ◽  
M. Lehnen
Keyword(s):  
Runaway Electron ◽  
Impurity Content ◽  
Tokamak Plasmas ◽  
Electron Dynamics ◽  
High Impurity

scholarly journals Space dependent, full orbit effects on runaway electron dynamics in tokamak plasmas

2017 ◽  
Vol 24 (4) ◽  
pp. 042512 ◽  
Author(s):  
L. Carbajal ◽  
D. del-Castillo-Negrete ◽  
D. Spong ◽  
S. Seal ◽  
L. Baylor
Keyword(s):  
Runaway Electron ◽  
Tokamak Plasmas ◽  
Electron Dynamics

Effect of magnetic and electrostatic fluctuations on the runaway electron dynamics in tokamak plasmas

1999 ◽  
Vol 6 (10) ◽  
pp. 3925-3933 ◽  
Author(s):  
J. R. Martín-Solís ◽  
R. Sánchez ◽  
B. Esposito
Keyword(s):  
Runaway Electron ◽  
Tokamak Plasmas ◽  
Electron Dynamics ◽  
Electrostatic Fluctuations

Symplectic integrators with adaptive time step applied to runaway electron dynamics

2019 ◽  
Vol 81 (4) ◽  
pp. 1295-1309 ◽  
Author(s):  
Yanyan Shi ◽  
Yajuan Sun ◽  
Yang He ◽  
Hong Qin ◽  
Jian Liu
Keyword(s):  
Runaway Electron ◽  
Symplectic Integrators ◽  
Electron Dynamics ◽  
Time Step ◽  
Adaptive Time Step ◽  
Adaptive Time

scholarly journals Adjoint Fokker-Planck equation and runaway electron dynamics

2016 ◽  
Vol 23 (1) ◽  
pp. 010702 ◽  
Author(s):  
Chang Liu ◽  
Dylan P. Brennan ◽  
Amitava Bhattacharjee ◽  
Allen H. Boozer
Keyword(s):  
Runaway Electron ◽  
Planck Equation ◽  
Electron Dynamics ◽  
Fokker Planck Equation ◽  
Fokker Planck

scholarly journals Kinetic modelling of runaway electron generation in argon-induced disruptions in ASDEX Upgrade

2020 ◽  
Vol 86 (4) ◽  
Author(s):  
K. Insulander Björk ◽  
G. Papp ◽  
O. Embreus ◽  
L. Hesslow ◽  
T. Fülöp ◽  
...  
Keyword(s):  
Runaway Electron ◽  
Kinetic Modelling ◽  
Electron Distribution Function ◽  
Real Space ◽  
Tokamak Plasmas ◽  
Runaway Electrons ◽  
Plateau Phase ◽  
Electron Generation ◽  
Current Dissipation ◽  
Threshold Amount

Massive material injection has been proposed as a way to mitigate the formation of a beam of relativistic runaway electrons that may result from a disruption in tokamak plasmas. In this paper we analyse runaway generation observed in eleven ASDEX Upgrade discharges where disruption was triggered using massive gas injection. We present numerical simulations in scenarios characteristic of on-axis plasma conditions, constrained by experimental observations, using a description of the runaway dynamics with a self-consistent electric field and temperature evolution in two-dimensional momentum space and zero-dimensional real space. We describe the evolution of the electron distribution function during the disruption, and show that the runaway seed generation is dominated by hot-tail in all of the simulated discharges. We reproduce the observed dependence of the current dissipation rate on the amount of injected argon during the runaway plateau phase. Our simulations also indicate that above a threshold amount of injected argon, the current density after the current quench depends strongly on the argon densities. This trend is not observed in the experiments, which suggests that effects not captured by zero-dimensional kinetic modelling – such as runaway seed transport – are also important.

Study of runaway electron dynamics at the ASDEX Upgrade tokamak during impurity injection using fast hard X-ray spectrometry

2021 ◽  
Author(s):  
Alexander E Shevelev ◽  
Evgeniy Khilkevitch ◽  
Margarita Iliasova ◽  
Massimo Nocente ◽  
Gabriella Pautasso ◽  
...  
Keyword(s):  
Runaway Electron ◽  
Electron Dynamics ◽  
X Ray

Positron Trapping within the Grain and at Grain Boundaries in Sintered Alumina of High Impurity Content

2004 ◽  
Vol 445-446 ◽  
pp. 177-179 ◽  
Author(s):  
A. Si Ahmed ◽  
Jerzy Kansy ◽  
Kamel Zarbout ◽  
Gérard Moya ◽  
Dominique Gœuriot
Keyword(s):  
Grain Boundaries ◽  
Impurity Content ◽  
Positron Trapping ◽  
High Impurity
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