Magnetic field amplification and electron acceleration to near ion energy equipartition from a mildly quasi-parallel relativistic shock Gareth Murphy (1), Mark Dieckmann(2), Luke Drury(1) 1. Dublin Inst for Advanced Studies, 2. Univ. of Linkoping 0 2000 4000 6000 8000 0 100 200 300 400 log(!), Time = 16000"t 0.0 0.6 1.3 1.9 2.5 3.2 3.8 0 2000 4000 6000 8000 -1.0 -0.5 0.0 0.5 Ion Phase Space, Time = 16000!t 0.3 1.1 1.9 2.7 3.4 4.2 5.0
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Magnetic field amplification and electron acceleration to near ion energy equipartition
from a mildly quasi-parallel relativistic shock Gareth Murphy(1), Mark Dieckmann(2), Luke Drury(1)
1. Dublin Inst for Advanced Studies, 2. Univ. of Linkoping
0 2000 4000 6000 80000
100
200
300
400log(!), Time = 16000"t
0.0 0.6 1.3 1.9 2.5 3.2 3.8
0 2000 4000 6000 8000-1.0
-0.5
0.0
0.5
Ion Phase Space, Time = 16000!t
0.3 1.1 1.9 2.7 3.4 4.2 5.0
Motivation
• Explore the formation of mildly relativistic shocks at kinetic level with PIC simulations
• How is non-thermal radiation produced?
• How does a quasi-parallel field affect shock formation?
GRB internal shock
• When fast blobs meet slow blobs
• Internal shock
• Emission of Gamma rays
• Synchrotron (jitter) radiation implies fast electrons and large magnetic fields
Numerical Method
• Particle In Cell (PIC) Simulations
• Plasma Simulation Code (PSC; Ruhl et al 2003)
• MPI-Parallel
Problem setup
• 0.9c collision speed
• Density ratio of 10
• Ion/electron mass ratio of 250
• Quasi-parallel magnetic field
• 100 CP’s per cell
• 18,000 x400 cells in 2D
1D structure
0 200 400 600 800 10000
50
100
150
200Electron Phase Space, Time = 25000!t
0.3 0.9 1.5 2.1 2.7 3.3 3.9
Electron phase space
• Gamma of ~ 100 for a tenuous population of electrons 0 2000 4000 6000 8000