Ultra-high electron beam power and energy densities using a plasma-filled rod-pinch diode
| Autor: | Joseph W. Schumer, D.M. Ponce, G. Cooperstein, S.J. Stephanakis, S. D. Strasburg, S.B. Swanekamp, P. F. Ottinger, F. C. Young, R.J. Commisso, B.V. Weber, D. Mosher, D.D. Hinshelwood |
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| Rok vydání: | 2004 |
| Předmět: | |
| Zdroj: | Physics of Plasmas. 11:2916-2927 |
| ISSN: | 1089-7674 1070-664X |
| DOI: | 10.1063/1.1683564 |
| Popis: | The plasma-filled rod-pinch diode is a new technique to concentrate an intense electron beam to high power and energy density. Current from a pulsed power generator (typically ∼MV, MA, 100 ns pulse duration) flows through the injected plasma, which short-circuits the diode for 10–70 ns, then the impedance increases and a large fraction of the ∼MeV electron-beam energy is deposited at the tip of a 1 mm diameter, tapered rod anode, producing a small (sub-mm diameter), intense x-ray source. The current and voltage parameters imply 20–150 μm effective anode-cathode gaps at the time of maximum radiation, much smaller gaps than can be used between metal electrodes without premature shorting. Interferometric diagnostics indicate that the current initially sweeps up plasma in a snowplow-like manner, convecting current toward the rod tip. The density distribution is more diffuse at the time of beam formation with a low-density region near the rod surface where gap formation could occur. Particle simulations of the... |
| Databáze: | OpenAIRE |
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