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Experimental Studies of the Penetration of a Plasma Stream into a Transverse Magnetic Field
1.S. Chapman and V. C. A. Ferraro, Terr. Mag. (J. Geophys. Res.) 36, 77 (1931).
2.J. L. Tuck, Phys. Rev. Letters 3, 313 (1959).
3.D. J. Rose and M. C. Clark, Jr., Plasmas and Controlled Fusion (Technology Press, Cambridge, Massachusetts, and John Wiley & Sons, Inc., New York, 1961), p. 416.
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5.See Ref. 1.
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9.Ref. 3, p. 395.
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17.All numbered equations are in rationalized mks units.
18.The applied magnetic field is measured on the axis of symmetry and midway between the field coils.
19.The plate consists of a 10‐cm‐wide and 15‐cm‐high sheet of stainless steel oriented at right angles to the magnetic field and is surrounded by a Rogowski current measuring loop. The plate is thin enough (0.15‐mm thickness) to allow the pulsed magnetic field readily to penetrate it.
20.The fact that large current densities flow along the field lines to the shorting plate implies that there is plasma (which is probably of much lower number density than the plasma in the main stream) between the primary stream and the plate. If such a background plasma were not present, space charge effects would prevent such large currents from flowing.
21.This calculation ignores inductance effects and small corrections associated with the fact that the field is not uniform.
22.The initial rate of rise of the current in a loop with inductance L is given by
23.The resistance of the shorting plate is too low to produce an appreciable dissipation by Ohmic heating. Heating of the plate and plasma outside the mirror by losses in voltage sheath regions at the plate surfaces may occur, however.
24.T. H. Stix, Princeton University, Plasma Physics Laboratory Report Matt‐239 (1964).
25.F. L. Scarf, W. Bernstein, and R. W. Fredericks, J. Geophys. Res. 70, 9 (1965).
26.R. W. Fredricks, F. L. Scarf, and W. Bernstein, J. Geophys. Res. 70, 21 (1965).
27.This operating mode is obtained in either of two ways: (1) by shortening the delay between gas valve opening and voltage application to 100 μsec, or less, or (2) by reducing the total gas admitted by the valve approximately a factor of ten.
28.It is not known whether the 500 μsec is a natural decay time or is a result of the fact that the pulsed magnetic field begins decreasing significantly at this time.
29.Measurements of depolarization currents present on the surface of a glass plate located outside the magnetic mirrors in some cases show currents up to that observed in a corresponding metal plate.
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