Scheinker, A. Baily, S.A. Bradley III, J.T. Castellano, L.J. Hill, J.O. Knapp, D.J. Kwon, S. Lyles, J.T.M. Prokop, M.S. Rees, D. Torrez, P.A. JACoW Geneva, Switzerland 978-3-95450-180-9 10.18429/JACoW-NAPAC2016-TUPOA63 English 411-413 TUPOA63 ion controls beam-loading LLRF FPGA Contribution to a conference proceedings 2017 2017-01 http://dx.doi.org/10.18429/JACoW-NAPAC2016-TUPOA63 https://jacow.org/napac2016/papers/tupoa63.pdf The analog low level RF (LLRF) control system of the Los Alamos Neutron Science Center is being upgraded to a Field Programmable Gate Array (FPGA)-based digital system (DLLRF). In this paper we give an overview of the FPGA design and the overall DLLRF system. We also present preliminary performance measurements including results utilizing model-independent iterative feedforward for beam-loading transient minimization, which is being studied for utilization in the future MaRIE X-FEL, which will face difficult beam loading conditions.