A first proof of principle booster setup for the MADMAX dielectric haloscope Jacob Egge, Stefan Knirck, Béla Majorovits, Christopher Moore and Olaf Reimann Eur. Phys. J. C, 80 5 (2020) 392 Published online: 11 May 2020 DOI: 10.1140/epjc/s10052-020-7985-8