Theoretical modeling and experimental characterization of a rod-pinch diode
| Autor: | S.B. Swanekamp, F. C. Young, R.J. Commisso, G. Cooperstein, D. Mosher, S.J. Stephanakis, B.V. Weber, P. F. Ottinger, Joseph W. Schumer, D.D. Hinshelwood, J.R. Boller |
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| Rok vydání: | 2001 |
| Předmět: | |
| Zdroj: | Physics of Plasmas. 8:4618-4636 |
| ISSN: | 1089-7674 1070-664X |
| DOI: | 10.1063/1.1403016 |
| Popis: | The rod-pinch diode consists of an annular cathode and a small-diameter anode rod that extends through the hole in the cathode. With high-atomic-number material at the tip of the anode rod, the diode provides a small-area, high-yield x-ray source for pulsed radiography. The diode is operated in positive polarity at peak voltages of 1 to 2 MV with peak total electrical currents of 30–70 kA. Anode rod diameters as small as 0.5 mm are used. When electrode plasma motion is properly included, analysis shows that the diode impedance is determined by space-charge-limited current scaling at low voltage and self-magnetically limited critical current scaling at high voltage. As the current approaches the critical current, the electron beam pinches. When anode plasma forms and ions are produced, a strong pinch occurs at the tip of the rod with current densities exceeding 106 A/cm2. Under these conditions, pinch propagation speeds as high as 0.8 cm/ns are observed along a rod extending well beyond the cathode. Even f... |
| Databáze: | OpenAIRE |
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