Advances in Electronics and Electron Physics, Vol. 54 by L. Marton, C. Marton (Eds.)

By L. Marton, C. Marton (Eds.)

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22 P . J . BAUM AND A. BRATENAHL Syrovatskii, 1976). They allow the plasma conductivity to make a transition to anomalous resistivity when the current densityj exceeds a threshold level. They also include the effects of radiation cooling. They find pairs of slow shocks attached to the ends of current sheet. The asymptotic location of the shocks is most strongly dependent on plasma conductivity. The shock locus moves farther downstream as the conductivity increases. The current sheet also thins and lengthens as the conductivity increases.

In typical operation, a 6-kV capacitor bank discharge is initiated into preionized argon at 165 mTorr. 4 psec to reach the center of the chamber, where they collide, merging together to form an expanding oval. 6 psec test time interval that begins at the moment of collision, when the rod currents are 20 kA each, and ends at peak current (95 kA), 12 psec after discharge initiation. The system of interest is the doubly connected pillbox-shaped volume exterior to the rods, and interior to the expanding oval current sheet.

While the agreement is by no means perfect, it seems reasonable to conclude that ion-acoustic waves are excited during IFTE. It is of interest to examine the energy balance in the DIPD and to do so we examine the various contribution to the total power P = IsK = urn+ Q, + Qx where Urnis the rate of change of magnetic energy, Q, the power associated with the inverse pinches, and Qx the power associated with the x point region. Urnand Q, are estimated by Bratenahl and Yeates (1970) and P is known so that Q, can be estimated.

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