Speaker
Description
C-band accelerators have been of particular interest in recent years due to their ability to provide high gradients and transport high charge beams for applications such as colliders and medical technologies. These technologies are made possible by new advancements in high gradient technologies that can suppress the breakdown rate in a particular structure by using distributed coupling, cryogenic cooling, and copper alloys. Previous work has shown each of these separately to significantly improve the maximum achievable gradient. In this work, for the first time, we will combine all three methods in an ultra-high gradient structure and benchmark the difference between copper (Cu) and copper silver (CuAg). The exact same structures were previously tested at room temperature and showed gradients in excess of 200 MeV/m and a 20% improvement in the copper silver version over its pure copper counterpart [M Schneider et al Appl. Phys. Lett. 121, 254101 (2022)] . In this test, these structures are tested at 77K simultaneously through a hybrid manifold. They were found to perform similarly due to the presence of significant beam loading caused by a suppression in the quality factor as a function of time. Taking beam loading into account, we still were able to observe a maximum achievable gradient of 200 MeV/m achieved for a 1 µs pulse at an input power of 5 MW into each cavity with a breakdown rate of 10^-1 breakdown/pulse/m .
