T Yabuuchi et al 2009 New J. Phys. 11 093031 doi:10.1088/1367-2630/11/9/093031
Evidence of anomalous resistivity for hot electron propagation through a dense fusion core in fast ignition experiments
T Yabuuchi1,2,7,8, A Das3, G R Kumar4, H Habara1,2, P K Kaw3, R Kodama1,2, K Mima2, P A Norreys5,6, S Sengupta3 and K A Tanaka1,2
Show affiliationsAnomalous resistivity for hot electrons passing through a dense core plasma is studied for fast ignition laser fusion. The hot electrons generated via the ultra-intense laser pulse and guiding cone interactions are measured after they pass through a dense plasma with a density of 50–100 g cm−3 in a radius of 15–25 μm. When significant neutron enhancements are achieved by the ultra-intense laser pulse injection, the energy reduction of fast electrons is observed. Also, a reduction in the number of electrons with energy up to 15 MeV can be seen. We offer a new physical mechanism for the stopping of electrons, involving electron magnetohydrodynamic shock formation in the inhomogeneous plasma density region. The dissipation in the shock region can explain electron stopping with energies of the order of 15 MeV.
- PACS
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52.57.Kk Fast ignition of compressed fusion fuels
52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
- Subjects
- Dates
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Issue 9 (September 2009)
Received 8 June 2009
Published 22 September 2009
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Evidence of anomalous resistivity for hot electron propagation through a dense fusion core in fast ignition experiments
T Yabuuchi et al 2009 New J. Phys. 11 093031
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