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Improvement in the heating efficiency of fast ignition inertial confinement fusion through suppression of the preformed plasma
- Source :
- Nuclear Fusion. 57:066022
- Publication Year :
- 2017
- Publisher :
- IOP Publishing, 2017.
-
Abstract
- The study of fast electron spectrum optimization by suppression of preformed plasma in fast ignition targets is presented in this work. Integrated fast-electron spectra for electron energies below 3 MeV—the energy range responsible for core heating—are compared for different preformed plasma conditions. The pulse contrast (the ratio of peak-to-pedestal laser intensities) is compared for 108, 109 and 1011 conditions at constant laser energy (~500 J), pulse duration (2 ps), spot size (30% encircled energy on 50 µm diameter) and laser intensity (around 1 × 1019 W cm−2). The best electron spectrum optimization, consisting of maximized electron number for energies below 3 MeV was obtained with 14 µm thick cone targets. The energy coupling efficiency from heating laser to core plasma, assuming typical core plasma parameters, was estimated to be 2%, although 0.37% was obtained with previous conditions with poor pulse contrast and a 7 µm thick cone target.
- Subjects :
- Nuclear and High Energy Physics
Range (particle radiation)
Materials science
Plasma parameters
Pulse duration
Plasma
Electron
Condensed Matter Physics
Laser
01 natural sciences
Encircled energy
010305 fluids & plasmas
law.invention
law
0103 physical sciences
Atomic physics
010306 general physics
Inertial confinement fusion
Subjects
Details
- ISSN :
- 17414326 and 00295515
- Volume :
- 57
- Database :
- OpenAIRE
- Journal :
- Nuclear Fusion
- Accession number :
- edsair.doi...........5b3ab635f4d65b0d96fe1f16a7c843b6