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WG1: Fast ignition and fast electron transport

Fast ignition was proposed as an alternative ignition scheme [1] aimed to reduce the drive requirements by separating fuel compression and ignition. In electron-driven fast ignition (EFI), after fuel compression, a fast electron jet is generated near the cone tip by an ultra-high intensity laser beam (>1020W/cm2). Fast electrons deposit their energy in the compressed fuel, triggering the fusion reaction. Recently, fast electron guiding by imposed B-fields has been proposed to increase the laser-to-fuel coupling efficiency. First experiments have evidenced fast electron guiding by kT B- fields generated by laser-driven coils. This opens a new possibility for EFI as well as for many other applications of extremely intense magnetic fields.

 

Ion-driven fast ignition (IFI) offers several advantages over EFI, such as the well known ion interaction and the possibility of choosing different ion species and ion spectra. IFI progress so far can be summarized by the experimental achievement of high conversion efficiencies and the demonstration of beam focusing. This last achievement is crucial because it points a way forward to successful IFI experiments.

The goal of the WG1 is to advance theoretically and experimentally in generation and transport of laser-driven particles and their application to fast ignition of fusion targets. This work will be carried out in close collaboration with the worldwide leading institutions in this field. 

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[1] M. Tabak, J. Hammer, M. E. Glinsky, W. L. Kruer, S. C. Wilks, J. Woodworth, E. M. Campbell, et al., Phys. Plasmas 1, 1626 (1994). 

 

 

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