Project Description: 

There is a common problem in microwave systems of satellites and in particle accelerators, namely the multipactoring effect, a kind of electron resonance in powerful radiofrequency (RF) fields. This effect is strongly linked with the secondary electron yield (SEY) of metallic surfaces involved. To reduce SEY, the idea is to produce an electromagnetically rough surface which is mechanically very smooth. This electromagnetic roughness can be implemented by magnetizing the intermediate layer between the aluminum body of some (satellite) microwave filter and the final silver coating (RF losses). The coatings typically have a thickness of 10 µm. Magnetization can be done with a write head. This type of static magnetization pattern should have a similar effect on slow electrons close to the surface, but without is disadvantage of degrading RF losses.


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