Polarized imaging of visible synchrotron emission from runaway electron plateaus in DIII-D

2021 ◽  
Vol 28 (8) ◽  
pp. 082510
Author(s):  
Ž. Popović ◽  
E. M. Hollmann ◽  
D. del-Castillo-Negrete ◽  
I. Bykov ◽  
R. A. Moyer ◽  
...  
Keyword(s):  
Runaway Electron ◽  
Synchrotron Emission

Spontaneous synchrotron emission from a plasma with an energetic runaway electron tail

1978 ◽  
Vol 21 (9) ◽  
pp. 1502 ◽  
Author(s):  
H. P. Freund ◽  
C. S. Wu ◽  
L. C. Lee ◽  
D. Dillenburg
Keyword(s):  
Runaway Electron ◽  
Synchrotron Emission

Simulated synchrotron emission for the Tycho’s supernova remnants: an asymmetric initial mass model

2020 ◽  
Vol 494 (2) ◽  
pp. 1531-1538
Author(s):  
A Moranchel-Basurto ◽  
P F Velázquez ◽  
G Ares de Parga ◽  
E M Reynoso ◽  
E M Schneiter ◽  
...  
Keyword(s):  
Supernova Remnants ◽  
Brightness Distribution ◽  
Radio Continuum ◽  
Initial Mass ◽  
Continuum Emission ◽  
Synchrotron Emission ◽  
Mass Model ◽  
Mhd Simulations ◽  
Tycho’S Snr ◽  
Good Agreement

ABSTRACT We have performed 3D magnetohydrodynamics (MHD) numerical simulations with the aim of exploring the scenario in which the initial mass distribution of a supernova (SN) explosion is anisotropic. The purpose is to analyse if this scenario can also explain the radio-continuum emission and the expansion observed in young supernova remnants (SNRs). To study the expansion, synthetic polarized synchrotron emission maps were computed from the MHD simulations. We found a good agreement (under a number of assumptions) between this expansion study and previous observational results applied to Tycho’s SNR, which represents a good example of asymmetric young SNRs. Additionally, both the observed morphology and the brightness distribution are qualitatively reproduced.

scholarly journals Toroidal modeling of runaway electron loss due to 3-D fields in DIII-D and COMPASS

2020 ◽  
Vol 27 (10) ◽  
pp. 102507
Author(s):  
Yueqiang Liu ◽  
C. Paz-Soldan ◽  
E. Macusova ◽  
T. Markovic ◽  
O. Ficker ◽  
...  
Keyword(s):  
Runaway Electron ◽  
Electron Loss

scholarly journals Spatiotemporal analysis of the runaway distribution function from synchrotron images in an ASDEX Upgrade disruption

2021 ◽  
Vol 87 (1) ◽  
Author(s):  
M. Hoppe ◽  
L. Hesslow ◽  
O. Embreus ◽  
L. Unnerfelt ◽  
G. Papp ◽  
...  
Keyword(s):  
Radial Profile ◽  
Spatiotemporal Analysis ◽  
High Energy ◽  
Synchrotron Emission ◽  
Analytic Model ◽  
Runaway Electrons ◽  
Radial Density ◽  
Radial Density Profile ◽  
Argon Injection ◽  
Seed Population

Synchrotron radiation images from runaway electrons (REs) in an ASDEX Upgrade discharge disrupted by argon injection are analysed using the synchrotron diagnostic tool Soft and coupled fluid-kinetic simulations. We show that the evolution of the runaway distribution is well described by an initial hot-tail seed population, which is accelerated to energies between 25–50 MeV during the current quench, together with an avalanche runaway tail which has an exponentially decreasing energy spectrum. We find that, although the avalanche component carries the vast majority of the current, it is the high-energy seed remnant that dominates synchrotron emission. With insights from the fluid-kinetic simulations, an analytic model for the evolution of the runaway seed component is developed and used to reconstruct the radial density profile of the RE beam. The analysis shows that the observed change of the synchrotron pattern from circular to crescent shape is caused by a rapid redistribution of the radial profile of the runaway density.

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