RF SplitBox for European Spallation Source

RF SplitBox is a 10-channel signal distribution module designed for use in LLRF control system of the European Spallation Source accelerator. It is designed in two variants, operating at different signal frequencies: 352.21 MHz and 704.42 MHz. The device is constructed from several submodules. Their design is discussed in this paper, with main focus on low-loss and low phase drift RF power splitter circuits. Low phase drift in signal distribution modules is essential for achieving and maintaining required beam parameters in the accelerator. RF SplitBox prototype measurement results are presented.