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Plasma Physics and Nuclear Fusion

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Plasma Characteristics. Plasma Confinement. Experimental Devices. Advantages of Fusion ... Lawson Criterion: nt 1020 s/m3. Two Approaches. Inertial ... – PowerPoint PPT presentation

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Title: Plasma Physics and Nuclear Fusion


1
Plasma Physics and Nuclear Fusion
  • J. C. Sprott
  • Department of Physics
  • University of Wisconsin - Madison
  • Presented to
  • Physics 208
  • on October 30, 1998

2
Outline
  • Fission versus Fusion
  • Requirements for Fusion
  • Plasma Characteristics
  • Plasma Confinement
  • Experimental Devices

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Advantages of Fusion
  • Inexhaustible Supply of Fuel
  • Relatively Safe and Clean
  • Possibility of Direct Conversion

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Requirements for Fusion
  • High Temperatures
  • Adequate Densities
  • Adequate Confinement
  • Lawson Criterion nt gt 1020 s/m3

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Two Approaches
  • Inertial Confinement
  • n ? 1030 / m3
  • t ? 10-10 s
  • Magnetic Confinement
  • n ? 1020 / m3
  • t ? 1 s

15
Magnetic Confinement
  • Magnetic Field Limit B lt 5 T
  • Pressure Balance nkT ? 0.1B2/2?0
  • gt n ? 1020 / m3 _at_ T 108 K
  • Atmospheric density is 2 x 1025 / m3
  • Good vacuum is required
  • Pressure nkT ? 1 atmosphere
  • Confinement t ? 1 s
  • A 10 keV electron travels 30,000 miles in 1 s

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