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Article

Plasma Spraying of a Microwave Absorber Coating for an RF Dummy Load

1
Institute for Manufacturing Technologies of Ceramic Components and Composites (IMTCCC), University of Stuttgart, Allmandring 7b, 70569 Stuttgart, Germany
2
Institute for Pulsed Power and Microwave Technology (IHM), Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Robert B. Heimann
Coatings 2021, 11(7), 801; https://doi.org/10.3390/coatings11070801
Received: 17 May 2021 / Revised: 18 June 2021 / Accepted: 25 June 2021 / Published: 2 July 2021
(This article belongs to the Special Issue Plasma Sprayed Coatings)
The European fusion reactor research facility, called International Thermonuclear Experimental Reactor (ITER), is one of the most challenging projects that involves design and testing of hundreds of separately designed reactor elements and peripheric modules. One of the core elements involved in plasma heating are gyrotrons. They are used as a microwave source in electron–cyclotron resonance heating systems (ECRH) for variable injection of RF power into the plasma ring. In this work, the development and application of an alumina-titania 60/40 mixed oxide ceramic absorber coating on a copper cylinder is described. The cylinder is part of a dummy load used in gyrotron testing and its purpose is to absorb microwave radiation generated by gyrotrons during testing phase. The coating is applied by means of atmospheric plasma spraying (APS). The absorber coating is deposited on the inner diameter of a one-meter cylindrical tube. To ensure homogeneous radiation absorption when the incoming microwave beam is repeatedly scattered along the inner tube surface, the coating shows a varying thickness as a function of the tube length. By this it is ensured that the thermal power is distributed homogeneously on the entire inner tube surface. This paper describes a modeling approach of the coating thickness distribution, the manufacturing concept for the internal plasma spray coating and the coating characterization with regard to coating microstructure and microwave absorption characteristics. View Full-Text
Keywords: microwave; absorber coating; Al2O3/TiO2; APS; 170 GHz; gyrotron; fusion reactor microwave; absorber coating; Al2O3/TiO2; APS; 170 GHz; gyrotron; fusion reactor
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MDPI and ACS Style

Killinger, A.; Gantenbein, G.; Illy, S.; Ruess, T.; Weggen, J.; Martinez-Garcia, V. Plasma Spraying of a Microwave Absorber Coating for an RF Dummy Load. Coatings 2021, 11, 801. https://doi.org/10.3390/coatings11070801

AMA Style

Killinger A, Gantenbein G, Illy S, Ruess T, Weggen J, Martinez-Garcia V. Plasma Spraying of a Microwave Absorber Coating for an RF Dummy Load. Coatings. 2021; 11(7):801. https://doi.org/10.3390/coatings11070801

Chicago/Turabian Style

Killinger, Andreas, Gerd Gantenbein, Stefan Illy, Tobias Ruess, Jörg Weggen, and Venancio Martinez-Garcia. 2021. "Plasma Spraying of a Microwave Absorber Coating for an RF Dummy Load" Coatings 11, no. 7: 801. https://doi.org/10.3390/coatings11070801

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