Reaction Ignition Temperature Out put Energy Fuel Product (mIllons ofC) (kev) (kev) D +T 4He 45 17600 D +sHe 4He+ P 8→8 350 30 18300 SHe+ n D+ D 35 4,0D 400 4
Requirements for Fusion High Temperatures Adequate Densities Adequate Confinement Lawson criterion ni> 10 20 s/r
Requirements for Fusion • High Temperatures • Adequate Densities • Adequate Confinement • Lawson Criterion: nt > 1020 s/m3
4. Progress Towards Fusion Power Fusion can be accomplished in Three Different Ways Magnetic Confinement Nucleus magnetic Field Intense Electron Energy Fucl Pellet SUN Inertial Confinement Gravitational Confinement
4. Progress Towards Fusion Power
Magnetic Confinement B F B At p the magnetic field b is uniform in the x direction and so the magnetic force F acts vertically downwards. However, at point Q, b has a vertical component, which results in the force having a component parallel to the x- axis directing the particle towards the region of lower field
At P, the magnetic field B is uniform in the x direction and so the magnetic. force F acts vertically downwards. However, at point Q, B has a vertical component, which results in the force having a component parallel to the xaxis directing the particle towards the region of lower field Magnetic Confinement
FIG 5-2. MOTION OF A CHARGED PARTICLE IN A MAGNETC MIRROR SYSTEM. As the particl winds into a tighter and faster helix, its forward motion is decelerated and finally brought to a halt The particle is then reflected back into the central region whence it came