VXI based Low Level RF system for Fermilab Linac Upgrade

A VXI-based Low Level RF (LLRF) system has been designed for the Linac Upgrade project at Fermilab. The design includes not only amplitude and phase feedback around the 805 MHz Klystron and side coupled cavities, but also an adaptive feedforward circuit to compensate for beam loading. In this paper, we will concentrate on the advantages of the VXI environment as well as actual system performance. >