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Plasma Physics and Nuclear Fusion
J. C. SprottDepartment of Physics
University of Wisconsin - Madison
Presented to
Physics 208
on October 30, 1998
Outline
Fission versus Fusion
Requirements for Fusion
Plasma Characteristics
Plasma Confinement
Experimental Devices
Advantages of Fusion
Inexhaustible Supply of Fuel
Relatively Safe and Clean
Possibility of Direct Conversion
Requirements for Fusion
High Temperatures
Adequate Densities
Adequate Confinement
Lawson Criterion: n >
1020 s/m3
Two Approaches
Inertial Confinement: n 1030 / m3
10-10 s
Magnetic Confinement: n 1020 / m3
1 s
Magnetic Confinement
Magnetic Field Limit: B < 5 T Pressure Balance: nkT 0.1B2/20
==> n 1020 / m3 @ T = 108 K Atmospheric density is 2 x 1025 / m3
Good vacuum is required Pressure: nkT 1 atmosphere Confinement: 1 s A 10 keV electron travels 30,000
miles in 1 s
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