Beam Test of the CERN PSB Wide-band RF System Prototype in the J-PARC MR

Abstract

In the framework of the LHC Injectors Upgrade project (LIU), a complete replacement of the existing narrow band rf systems of CERN PSB with wideband magnetic alloy (MA) loaded rf systems is under consideration. A single gap MA loaded rf system prototype, which uses solid-state power amplifier and includes fast rf feedback for beam loading compensation, has been installed in the J-PARC MR to investigate the system behavior with high intensity proton beams. Wereportthewakevoltagemeasurementresultswith and without fast rf feedback. In addition to the fast feedback, the rf feedforward method is under consideration to compensate the heavy beam loading more effectively. Preliminary beam test results with feedforward are also presented.