Imperial College London
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DrBrianAppelbe

Faculty of Natural Sciences, Department of Physics

Research Fellow
 
 
 
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Contact

 

+44 (0)20 7594 7651b.appelbe07 Website

 
 
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Location

 

740Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Appelbe:2017:10.1016/j.hedp.2017.01.005,
author = {Appelbe, B and Pecover, J and Chittenden, J},
doi = {10.1016/j.hedp.2017.01.005},
journal = {High Energy Density Physics},
pages = {27--36},
title = {The effects of magnetic field topology on secondary neutron spectra in magnetized liner inertial fusion},
url = {http://dx.doi.org/10.1016/j.hedp.2017.01.005},
volume = {22},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The Magnetized Liner Inertial Fusion (MagLIF) concept involves the compression of a magnetized fuel such that the stagnated fuel contains a magnetic field that can suppress heat flow losses and confine α particles. Magnetic confinement of α particles reduces the fuel ρR required for ignition. Recent work [1,2] has demonstrated that the magnitude of the magnetic field in deuterium fuel can be inferred from the yields and spectra of secondary DT neutrons. In this work we investigate the potential for using the shape of the secondary neutron spectra to diagnose the magnetic field topology in the stagnated fuel. Three different field topologies that could possibly occur in MagLIF experiments are studied: (1) a cylindrical fuel column containing axial and azimuthal magnetic field components, (2) a fuel column which is pinched at the ends to form a magnetic mirror and (3) a fuel column that has a helical tube shape with magnetic field lines following the helical path of the tube’s axis. Each topology is motivated by observations from experimental or simulated MagLIF data. For each topology we use a multi-physics model to investigate the shapes of the secondary neutron spectra emitted from a steady-state stagnated fuel column. It is found that the azimuthal and helical topologies are more suitable than the mirror topology for reproducing an asymmetry in the axial spectra that was observed in experiments. Gorgon MHD simulations of the MagLIF implosion in 1D are also carried out. These show that sufficient azimuthal magnetic field can penetrate from the liner into the fuel to qualitatively reproduce the observed spectral asymmetry.
AU  - Appelbe,B
AU  - Pecover,J
AU  - Chittenden,J
DO  - 10.1016/j.hedp.2017.01.005
EP  - 36
PY  - 2017///
SN  - 1878-0563
SP  - 27
TI  - The effects of magnetic field topology on secondary neutron spectra in magnetized liner inertial fusion
T2  - High Energy Density Physics
UR  - http://dx.doi.org/10.1016/j.hedp.2017.01.005
UR  - http://hdl.handle.net/10044/1/44848
VL  - 22
ER  -
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