Issues and R&D Required for the Intensity Frontier Accelerators
  Operation, upgrade and development of accelerators for Intensity Frontier face formidable challenges in order to satisfy both the near-term and long-term Particle Physics program. Here we discuss key issues and R&D required for the Intensity Frontier accelerators. 
V. Shiltsev, S. Henderson, P. Hurh, I. Kourbanis, V. Lebedev   (Fermilab)
physics.acc-ph