Improving Fabrication and Performance of Additively Manufactured RF Cavities by Employing Co-Printed Support Structures and Their Subsequent Removal

Resumen

The enormous potential of additive manufacturing (AM), particularly laser powder bed fusion (L-PBF), to produce radiofrequency cavities (cavities) has already been demonstrated. However, the required geometrical accuracy for GHz TM010" role="presentation">????010TM010 T M 010 cavities is currently only achieved by (a) avoiding downskin angles &lt;40&#x2218;" role="presentation"><40°<40° < 40 ° , which in turn leads to a cavity geometry with reduced performance, or (b) co-printed support structures, which are difficult to remove for small GHz cavities. We have developed an L-PBF-based manufacturing routine to overcome this limitation. To enable arbitrary geometries, co-printed support structures are used that are designed in such a way that they can be removed after printing by electrochemical post-processing, which simultaneously reduces the surface roughness and thus maximizes the quality factor Q0" role="presentation">??0Q0 Q 0 . The manufacturing approach is evaluated on two TM010" role="presentation">????010TM010 T M 010 single cavities printed entirely from high-purity copper. Both cavities achieve the desired resonance frequency and a Q0" role="presentation">??0Q0 Q 0 of approximately 8300.