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By W. B. Thompson (Auth.)

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4) where Mv is the mass of the proton. 5) 32 AN INTRODUCTION TO PLASMA PHYSICS and the sheath thickness is ~2λ/>. 1 gives values of λχ> in cm. ) is ~0·3 cm, usually increasing at high temperatures, the assumption of a collisionless sheath is justified. 1. The Debye Length XD = -y/(kTJ4cnne2)cm S~ T~—-^ c(cm~3) T (eV) ^ " - ^ ^ ^ lOio 1012 IOI4 10" 1 2-5x10-2 2-5x10-3 2-5x10-4 2-5x10-5 10 8-3x10-2 8-3x10-3 8-3 x l O - 4 8-3x10-5 0-25 2-5x10-2 2-5x10-3 2-5x20-4 100 It remains to justify the approximate boundary condition n = 0 on the walls of the tube.

12) continue to hold even though the plasma is isolated from the walls. io ο·β 0-6h 0-4l·- 02 h Οβ 0-6 0-4 0-2 O 0-2 0-4 06 αβ T/T0 I = 150 amps Te 12 no = 5·38χ l0 cm-3 3I,500°K wi = Ι·5χ 10? cm/sec T = l9-5°c F I G . 8. Electron density distribution in pinched discharge. Measured values of electron density (from Langmuir probes) normalized to central density vs. distance from axis. Electron temperature Te and central density no from probe measurements, axial drift w calculated from total current.

He used an argon shock tube driven by an oxygen-hydrogen explo­ sion, as did PETSCHEK, and produced ionizing shocks. Around the tube there was a coil producing a magnetic field through which the gas flowed. If magnetohydrodynamic behaviour occurred, the gas was accelerated toward the centre of the tube as it went through the field region, and beyond that would execute radial oscillations. These oscillations showed up as charac­ teristic patterns of light beyond the interaction region. The theory of PETSCHEK was used to calculate both the density p and conductivity σ behind the shock, as well as the time τ needed to reach thermal equilibrium.

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