Effects of local plasma formation with energy concentration in magnetically insulated transmission lines
In experiments on compression of a light liner in the module A5-1 facility energy is transmitted from the generator with an internal impedance of {rho} = 0.04 {Omega} to the load using a three-dimensional concentrator with a total inductance of L {approximately} 1 nH consisting of parallel magnetically insulated vacuum lines connected at the midpoint. Current was transported to the inductive load with an efficiency greater than 70%, while the measured electron leakage current was less than 0.5 MA. The measurements showed that the main losses occur in the region where the lines are joined. The losses in the concentrator could not be explained using the theory of magnetic self-insulation. In model experiments carried in the MSM device (U = 100-200 kV, {rho}{sub g} = 2 {Omega}, {tau} = 90 ns) to study the efficiency of energy transport along slab transmission lines to an inductive load with parameters close to those of the concentrator lines, it was found that for I > I{sub min} the losses are associated with local plasma flows representing a fast plasma component (V > 10{sup 7} cm/s), which are able to close the interelectrode gap. Optimization of the concentrator geometry yielded a current of I = 4.6 MA in the inductive load, close to the calculated value, for a potential in the incident wave of the generator forming line equal to U = 1.2 MV. 18 refs., 8 figs.
- OSTI ID:
- 416238
- Journal Information:
- Plasma Physics Reports, Vol. 19, Issue 9; Other Information: PBD: Sep 1993; TN: Translated from Fiz. Plazmy; 19, 1101-1109(Sep 1993)
- Country of Publication:
- United States
- Language:
- English
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