Development and test of klystron linearization packages for FPGA-based low level RF control systems of ILC-like electron accelerators

We report the development and implementation of two FPGA-based predistortion-type klystron linearization algorithms at the Fermi National Accelerator Laboratory (FNAL), USA and the Deutsches Elektronen Synchrotron (DESY), Germany. With those the generation of correction factors on the FPGA was improved, avoiding quantization and decreasing memory requirements. At FNAL the linearization algorithm was tested at the Advanced Superconducting Test Accelerator (ASTA) demonstrating a successful implementation. The functionality of the algorithm implemented at DESY was demonstrated successfully in a simulation.