Heavy-Ion Beam-Probe Systems for Plasma Diagnostics.
Rept. no. 5 (Final) 1 Dec 68-30 Nov 69,
MOBIL RESEARCH AND DEVELOPMENT CORP PRINCETON N J CENTRAL RESEARCH DIV LAB
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The design and operation of a plasma diagnostic system utilizing a heavy ion beam probe to measure plasma density, space potential and current density is described. This system provides three dimensional space resolution of the order of 0.001 cm cubed, time resolution of the order of 100 microsecs and is capable of making measurements that are continuous in both space and time. Maps of the density and space potential of an energetic arc plasma show that the gross features are similar for both parameters, but that there is an excess of electrons at a radus equal to the cathode radius and an excess of positive ions inside and outside this ring. Preliminary current density measurements suggest that the main arc current is carried by a strongly localized filament of streaming electrons. Design of a 200 kev, T1 plus ion beam probe for use on the Princeton Plasma Physics Laboratory ST Tokamak is described.
- Plasma Physics and Magnetohydrodynamics