Abstract
An analytical model for the ablation driven by hot electrons is developed. The hot electrons are assumed to carry on the totality of the absorbed laser energy. Efficient energy coupling requires to keep the critical surface sufficiently close to the ablation front. To achieve this goal for high laser intensities a short enough laser wavelength is required. Scaling laws for the ablation pressure and the other relevant magnitudes of the ablation cloud are found in terms of the laser and target parameters.
Highlights
The shock ignition (SI) approach to inertial confinement fusion (ICF) critically depends on the possibility to generate a very strong shock launched at the stagnation phase of the implosion by a pressure of the order of 1 Gbar [1, 2]
In directly driven laser fusion the generation of this shock needs to rise the laser intensity I up to 10 P W/cm2 or more, for a laser wave length λ = 0.35 μm. At such intensities the laser energy is absorbed in the subcritical region by collisionless processes that produce copious amounts of hot electrons (HE) [3], and it has been argued that they could be beneficial for the generation of the ignitor shock [1, 2]
The main difficulty to address this problem is that a detailed treatment of the HE generation requires to deal with kinetic mechanisms that are difficult to couple with the hydro-codes used for describing the target implosion and the later propagation of the ignitor shock
Summary
- Estimation of Phase Coherent Length of Hot Electrons in GaInAs Using Resonant Tunneling Diodes Young Cheul Kang, Kazuhito Furuya, Michihiko Suhara et al. - The Effect of Gate Bias on Hot Electron Trapping Heihachi Matsumoto, Kokichi Sawada, Sotoju Asai et al. This content was downloaded from IP address 140.181.90.131 on 21/10/2019 at 10:32. 8th International Conference on Inertial Fusion Sciences and Applications (IFSA 2013)
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