Dispositivo e uso del dispositivo per riflettere radiazione a microonde durante il riscaldamento a risonanza elettrone-ciclotrone.

The present invention relates to a device 100 for reflecting microwave radiation during electroncyclotron resonance heating (ECRH). The device 100 comprises a bulk portion 200 and at least one reflective layer 300a, 300b, 300c, wherein the bulk portion 200 includes dielectric material and the at least one reflective layer 300a, 300b, 300c is made of an electrically conductive material which has an electrical conductivity in a range of 0.1 - 70 MS/m, and wherein the thermal expansion coefficient of the bulk portion 200 differs from the thermal expansion coefficient of the at least one reflective layer 300a, 300b, 300c by an amount in a range of 0 – 20x10-6 /K, and wherein a cooling means 400a, 400b, 400c is provided at or at least partially within the bulk portion 200.