Analytical model for fast-shock ignition

A model and its improvements are introduced for a recently proposed approach to inertial confinement fusion, called fast-shock ignition (FSI). The analysis is based upon the gain models of fast ignition, shock ignition and considerations for the fast electrons penetration into the pre-compressed fue...

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Bibliographic Details
Published in:AIP advances 2014-07, Vol.4 (7), p.077130-077130-15
Main Authors: Ghasemi, S. A., Farahbod, A. H., Sobhanian, S.
Format: Article
Language:English
Subjects:
Computer simulation
Distribution functions
EFFICIENCY
Electron energy distribution
ELECTRON TEMPERATURE
ENERGY SPECTRA
FUELS
IGNITION
Inertial confinement fusion
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
KINETIC ENERGY
Mathematical models
MEV RANGE
Penetration
WAVELENGTHS
Weight
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Summary:A model and its improvements are introduced for a recently proposed approach to inertial confinement fusion, called fast-shock ignition (FSI). The analysis is based upon the gain models of fast ignition, shock ignition and considerations for the fast electrons penetration into the pre-compressed fuel to examine the formation of an effective central hot spot. Calculations of fast electrons penetration into the dense fuel show that if the initial electron kinetic energy is of the order ∼4.5 MeV, the electrons effectively reach the central part of the fuel. To evaluate more realistically the performance of FSI approach, we have used a quasi-two temperature electron energy distribution function of Strozzi (2012) and fast ignitor energy formula of Bellei (2013) that are consistent with 3D PIC simulations for different values of fast ignitor laser wavelength and coupling efficiency. The general advantages of fast-shock ignition in comparison with the shock ignition can be estimated to be better than 1.3 and it is seen that the best results can be obtained for the fuel mass around 1.5 mg, fast ignitor laser wavelength ∼0.3  micron and the shock ignitor energy weight factor about 0.25.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.4891648