Asymptotical Theory of Runaway Electron Diffusion Due to Magnetic Turbulence in Tokamak Plasmas

2010 ◽  
Vol 50 (10) ◽  
pp. 929-941 ◽  
Author(s):  
S. S. Abdullaev ◽  
K. H. Finken ◽  
T. Kudyakov ◽  
M. Lehnen
Keyword(s):  
Runaway Electron ◽  
Tokamak Plasmas ◽  
Electron Diffusion ◽  
Magnetic Turbulence

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.

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

Characterization of Magnetic Turbulence in Tokamak Plasmas through Hard X-Ray Spectra

1995 ◽  
Vol 74 (20) ◽  
pp. 3987-3990 ◽  
Author(s):  
L. Rodríguez-Rodrigo ◽  
F. Castejón
Keyword(s):  
Tokamak Plasmas ◽  
X Ray ◽  
Magnetic Turbulence

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 Stabilization of the Tearing Mode in Low-Density Tokamak Plasmas by Turbulent Electron Diffusion

1983 ◽  
Vol 50 (8) ◽  
pp. 583-586 ◽  
Author(s):  
E. Esarey ◽  
J. P. Freidberg ◽  
K. Molvig ◽  
C. O. Beasley ◽  
W. I. Van Rij
Keyword(s):  
Low Density ◽  
Tokamak Plasmas ◽  
Tearing Mode ◽  
Electron Diffusion

scholarly journals Kinetic modelling of runaway electron avalanches in tokamak plasmas

2015 ◽  
Vol 57 (9) ◽  
pp. 095006 ◽  
Author(s):  
E Nilsson ◽  
J Decker ◽  
Y Peysson ◽  
R S Granetz ◽  
F Saint-Laurent ◽  
...  
Keyword(s):  
Runaway Electron ◽  
Kinetic Modelling ◽  
Tokamak Plasmas ◽  
Electron Avalanches

Runaway electron mitigation by applied magnetic perturbations in RFX-mod tokamak plasmas

2016 ◽  
Vol 57 (1) ◽  
pp. 016014 ◽  
Author(s):  
M. Gobbin ◽  
M. Valisa ◽  
R.B. White ◽  
D. Cester ◽  
L. Marrelli ◽  
...  
Keyword(s):  
Runaway Electron ◽  
Tokamak Plasmas ◽  
Magnetic Perturbations

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
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