Path to a direct-drive ignition facility for fusion energy research that requires substantially less laser energy
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1 Path to a direct-drive ignition facility for fusion energy research that requires substantially less laser energy NRL Laser Fusion High Average Power Laser Program Workshop Lawrence Livermore National Laboratory 20 June 2005 Presented by Steve Obenschain Plasma Physics Division U. S. Naval Research Laboratory Work conducted by NRL Laser Fusion Research Team Special thanks to Denis Colombant for rapid advances
2 There appears to be a route to a much less expensive highrep ignition facility NRL Laser Fusion Increasing the implosion velocity from the nominal 300 km/sec to km/sec substantially reduces the energy needed for ignition. These higher velocities can be achieved by various combinations of increased drive intensity and increased pellet aspect ratio (radius to thickness) The best route for hydro-instability is increased drive intensity The upper bound on intensity is set by deleterious laser-plasma instabilities whose thresholds tend to scale as Iλ 2 The combination of a factor of 2 advantage in λ 2 and >THz bandwidth gives the KrF laser an advantage Our calculations indicate ignition with KrF at about 140 kj and gains >20 at 250 kj
3 140 kj 1/13 th of NIF design energy
4 3.9 x gain as well as heating by burn indicates 140 kj KrF Pellet internal energy spikes with burn
5 High and low implosion velocity pellets behave differently 1/ J, 3.5x10 15 W/ cm2 - KrF 1.2 MJ, 1.5x10 KrF x10 W/cm KrF W/cm MJ KrF 3.5x10 15 W/cm NRL Laser Fusion 20 Gain Gain 100 Gain 50 Ignition spark quenched 10 5 Fuel ignites but disassembles with low burn fraction Impl. velocity (10 7 cm/s) Implosion velocity (10 7 cm/sec) Impl. velocit y ( cm/ s) Implosion velocity (10 7 cm/sec)
6 Parametric studies utilized conventional pulse shapes and those with spike pre-pulses that can increase hydro-stability NRL Laser Fusion 1/ 4 - pulse (no spike) 0.25 MJ Laser Pulse ( no spike) 0.25 MJ Laser Pulse (with spike) 1/ 4 MJ target - with spike 100:1 100:1 P(W) P(W) log scale P( W) t (s) 4 ns t (s) 3.5% amplitude 200 ps spike separated 1.4 ns from main pulse
7 Gain increases and optimum implosion velocity decreases with laser energy 60 (λ = 248 nm, I = x10 15 W/cm 2 ) Conventional 100:1 pulse shape 4.06 NRL Laser Fusion implosion velocit ies (10 7 cm/ sec) laser energy (MJ)
8 Gain increased with addition of optimized spike! Lots of room to trade off gain for stability if needed 80 (λ = 248 nm, I = x10 15 W/cm 2 ) (6%, Δt=1.8 ns) NRL Laser Fusion with spike 40 (3.5%, Δt = 1.4 ns) no spike laser energy (MJ)
9 New (2005) vision and plan for laser fusion energy Smaller lower-cost Fusion Test Facility (FTF) based on new pellet designs Phase I: Basic laser fusion technology Krypton fluoride laser Diode-pumped solid-state laser Target fabrication and injection Chamber materials and optics Target design & physics 2D/3D simulations 1-30 kj laser-target exp. Phase II Develop full-size components Power-plant laser beamline Target fab/injection Power plant & FTF design Ignition physics validation Calibrated 3D simulations LPI experiments Phase III FTF operating 2018 Fusion Test Facility (FTF) 0.25 MJ laser-driven 5 Hz Pellet gains of MW of fusion thermal power Develop chamber materials & components. Upgrade path to 0.5 MJ and 150 MW fusion power
10 Platts Nuclear Energy Conference, 17 Feb Fusion is not on this roadmap!
11 Potential with fusion Improved Fusion Energy R&D Fusion Test Facility Operating MW thermal Fusion S&T Fission synergism DEMO Power Plant Operating 2030 GW electric power Operations Economics Ramp up commercial fusion!
12 There will be formidable competition to fusion power. The NRL laser fusion program is fully committed to exploring and developing the path to a lower laser energy high-rep ignition facility. Design studies also indicate that we may be able to significantly reduce the minimum laser energy needed for the fusion power plants. (<1 MJ?) We invite and expect contributions by the other HAPL participants
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