Operational Characteristics of a High Voltage Dense Plasma Focus.
Final rept. 7 May 82-19 Apr 85,
NEW MEXICO UNIV ALBUQUERQUE DEPT OF CHEMICAL AND NUCLEAR ENGINEERING
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A high voltage dense plasma focus powered by a single-stage Marx bank was designed, built and operated. The maximum bank parameters are voltage--120 kV, energy--20 kJ, short-circuit current--600kA. The bank impedance is about 200 millohms. The plasma focus center electrode diameter is 1.27 cm. The outer electrode diameter is 10.16 cm. Rundown length is about 10 cm, corresponding to a bank quarter period of about 900 millohms ns. Rundown L is about 50 milliohms. The context of this work is established with a review of previous plasma focus theoretical, experimental and computational work and related topics. Theoretical motivation for high voltage operation is presented. The design, construction and operation of this device are discussed in detail. Results and analysis of measurements obtained are presented. Device operation was investigated primarily at 80 kV 9 kJ, with a gas fill of about 1 torr H2, plus 3-5 percent A. The following diagnostics were used gun voltage and current measurements filtered, time-resolved x-ray PIN measurements of the pinch region time integrated x-ray pinhole photographs of the pinch region fast-frame visible light phototgraphs of the sheath during rundown and B probe measurements of the current sheath shortly before collapse. Keywords Coaxial Plasma Discharge, Dense Plasma Focus DPF, and Pulsed Neutron Source.
- Plasma Physics and Magnetohydrodynamics