Examinando por Autor "J Klar, Peter"

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Key design and operation factors for high performance of C12A7:e- based cathodes
(IOP Conference Series: Materials Science and Engineering, 2022) Post, Ángel; Plaza, José Fabián; Toledo, Javier; Zschätzsch, Daniel; Reitemeyer, Malina; Chen, Limei; Gurciullo, Antonio; Siegl, Andreas; J Klar, Peter; Lascombes, Paul
This work, based on an EU-funded project (NEMESIS), is summarising some of the results from the project activities on the research and development on electride-based cathode technology compatible with all kinds of electric propulsion (EP) systems requiring neutralization or electron emission. Further information describing in detail the performed tests and captured measurements can be found in the referenced documents of each section. Different cathode architectures and several emitter configurations with traditional and with alternative propellants are being developed and tested within the project, all of them using C12A7:e- electride material as thermionic electron source. Findings and conclusions derived from these multiple designs are allowing to figure out some of the key factors that determine the best performance of C12A7:e- electride based cathodes. In this work, a discussion of some of these key design and operation factors will be presented based both on the material characterization parameters, and on the performance tests carried out for the different cathode designs.
Performance comparison of LaB6 and C12A7:e-emitters for space electric propulsion cathodes
(IOP Conference Series: Materials Science and Engineering, 2022) Toledo, Javier; Plaza, José Fabián; Post, Ángel; Zschätzsch, Daniel; Reitemeyer, Malina; Chen, Limei; Gurciullo, Antonio; Siegl, Andreas; J Klar, Peter; Lascombes, Paul; Seifert, Bernhard
This work, based on an EU-funded project, NEMESIS, is aiming at developing electride-based cathode technology which is compatible with all kinds of electric propulsion systems requiring neutralization. Its target is to demonstrate and validate the performance of a novel C12A7:e- electride material as electron emitter instead of traditional thermionic emitters such as lanthanum hexaboride, LaB6, or barium oxide, BaO. In this study, a fair comparison between LaB6 and C12A7:e- samples was performed both addressing pure material characterization parameters as well as comparing performance as cathodes under different architectures and operational conditions. In this case, a current/cathode power ratio around 3 mA/W was obtained when using the C12A7:e- sample in a plasma environment with Ar, which is approximately one order of magnitude higher compared to the LaB6 sample.