Design and Studying Physical Properties of Cavity BPM Pickup for EuPRAXIA@SPARC_LAB

Abstract

EuPRAXIA@SPARC_LAB [1, 2] will make available at LNF a unique combination offering three different options: a high-brightness electron beam with 1 GeV energy generated in a novel X-band RF linac; a PW-class laser system; a compact light source directly driven by a plasma accelerator. Plasma and conventional RF linac driven FEL provide beam with parameters of 30–200 pC charge range, 10–100 Hz repetition rate, and 1 GeV electron energy. The control of the charge and the trajectory monitoring at a few picocoulomb and a few micrometers is mandatory in this machine. Particularly in the plasma interaction region, where the pickup resolution under 1 μm is required. As a possible solution, a cavity beam position monitor (cBPM) is proposed [3]. A prototype in the C-band frequency range has been designed. The pickup was optimized for low charge and single-shot bunches to meet the project requirements. Here is presented the process to achieve the required specifications. The simulations were performed to study RF properties and the electromagnetic response of the device.