Generation of a focused proton beam with a self‐magnetically BΘ‐insulated ion diode
| Autor: | Walter Schimassek, Walter H. Bauer, Otto Stoltz |
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| Rok vydání: | 1991 |
| Předmět: | |
| Zdroj: | Review of Scientific Instruments. 62:168-177 |
| ISSN: | 1089-7623 0034-6748 |
| Popis: | A self‐magnetically BΘ ‐insulated ion diode was investigated and optimized at the pulsed power line KALIF (2 MV, 50 ns, 2 Ω) to produce a focused and pulsed high‐intensity proton beam for generation of high‐power density in matter. This diode is characterized by an azimuthal insulating magnetic field that is generated by the diode current. The beam is neutralized by electrons from the cathode vanes, so that neither a gas filled drift space nor foils are needed. The beam therefore propagates in vacuum and repeated shots are possible without changing parts. The protons had energies up to 1.8 MeV and the proton content in the ion beam was about 50%. The maximum total diode current was about 800 kA and its efficiency was as high as 70%. The beam microdivergence was determined to be 1.1°. The radial dependence of the proton current density was measured and is proportional to r−1.74. This result was confirmed by 2D quasistatic particle‐in‐cell simulations. The focus was optimized by adjusting the anode shape an... |
| Databáze: | OpenAIRE |
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