Electron beam pinch
Horton, Edward R.
Spoerlein, Ross L.
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One of the major objects of current plasma pinch research is an understanding of turbulence and its effects in enhanced diffusion rates within a pinch. As an approach to this problem, the electron beam pinch was conceived. In this experiment, an electron beam (400 kev, 0.1 amp, 0.1 usee, duration) enters a linear pinch at one electrode and is observed (by light from a phosphor screen) at the opposite pinch electrode. By a selection of radial positions and time of injection, the turbulent pinch configuration may be explored. Use of a probe with such small mass (as beam of electrons) may yield important information on turbulent diffusion. This report presents the results of preliminary tests and the first effort to obtain parameter dependence of the pinch configuration so that the electron beam may be properly programmed. All runs wore made at a pinch current of 200,000 amp which, from previous experience, was assumed to be a good medium value. Initial gas pressures were varied from 25 to 400 microns of deuterium and initial z-field varied from 500 to 2000 gauss. Analysis of all runs show that pressure from particles boiled off the wall dominated over any other pressur distribution. Even for field configurations which show very little turbulence, the pressure at the wall is overpowering. Pressure distribution is improved by impressing a reversed axial field and by reducing the magnitude of the pinch current.
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