Magnetic Confinement

• Magnetic Field Limit: B < 5 T

• Pressure Balance: nkT ? 0.1B2/2?0

• ==> n ? 1020 / m3 @ 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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