The high-temperature thermal conductivity of ceramic materials that are candidates for an application as RF transmission windows in a fusion reactor was examined. Materials of interest are aluminum oxide (Al2O3), aluminum nitride (Al2O3), and magnesium aluminum oxide (MgAl2O4). In order to simulate the fast neutron interaction within the RF windows in an operating fusion reactor, different neutron sources with different energies were used. Additionally a-particle irradiation was performed in the KfK cyclotron with Emax = 100 MeV. Our results show that the thermal conductivity of all irradiated samples was reduced due to the scattering of lattice thermal waves by radiation-induced defects. The magnitude of the reduction depends on the concentration and type of defects, i.e., point defects or three-dimensional defect aggregates. This effect is discussed within a microscopic model.
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