@article{TEXTUAL, recid = {11626}, author = {Bowring, D. and Bross, A and Lane, Peter and Leonova, M. and Moretti, A. and Neuffer, D. and Pasquinelli, Ralph J. and Peterson, D. and Popovic, M. and Stratakis, D. and Yonehara, K. and Kochemirovskiy, A. and Torun, Y. and Adolphsen, C. and Ge, L. and Haase, A. and Li, Z. and Martin, D. and Chung, M. and Li, D. and Luo, T. and Freemire, B. and Liu, A and Palmer, M.}, title = {Operation of normal-conducting rf cavities in multi-Tesla magnetic fields for muon ionization cooling: A feasibility demonstration}, journal = {Physical Review Accelerators and Beams}, address = {2020-07-02}, number = {TEXTUAL}, abstract = {Ionization cooling is the preferred method for producing bright muon beams. This cooling technique requires the operation of normal conducting, radio-frequency (rf) accelerating cavities within the multi-tesla fields of dc solenoid magnets. Under these conditions, cavities exhibit increased susceptibility to rf breakdown, which can damage cooling channel components and imposes limits on channel length and transmission efficiency. We report, for the first time, stable high-vacuum, normal-conducting cavity operation at gradients of $50\text{ }\text{ }\mathrm{MV}/\mathrm{m}$ in an external magnetic field of three tesla, through the use of beryllium cavity elements. This eliminates a significant technical risk that has previously been inherent in ionization cooling channel designs.}, url = {http://knowledge.uchicago.edu/record/11626}, }