• D.W. Stracener, G. Alton, J.R. Beene, H. Z. Bilheux, J.-C. Bilheux, J.C. Blackmon, D. Dowling, R.C. Juras, Y. Kawai, Y. Liu, M.J. Meigs, P.E. Mueller, B. A. T. Tatum
  ORNL, Oak Ridge, Tennessee
• H.K. Carter, A. Kronenberg, E.H. Spejewski
  Center of Excellence for RIB Studies for Stewardship Science, Oak Ridge Associated Universities, Oak Ridge, Tennessee

Radioactive beams are produced at the Holifield Radioactive Ion Beam Facility (HRIBF) at Oak Ridge National Laboratory using the Isotope Separator On-Line (ISOL) technique. Radioactive nuclei are produced in a thick target via irradiation with energetic light ions (protons, deuterons, helium isotopes) and then post-accelerated to a few MeV/nucleon for use in nuclear physics experiments. An overview of radioactive beam development at the HRIBF will be presented, including ion source development, improvements in the ISOL production targets, and a description of techniques to improve the quality (intensity and purity) of the beams. Facilities for radioactive ion beam development include two ion source test facilities, a target/ion source preparation and quality assurance facility, and an in-beam test facility where low intensity production beams are used. A new test facility, the High Power Target Laboratory, will be available later this year. At this facility, high intensity production beams will be available to measure the power-handling capabilities of ISOL production targets. This information will be used to optimize target materials and geometries for high power densities.

• R.M. Ronningen, V. Blideanu, G. Bollen, D. Lawton, P.F. Mantica, D.J. Morrissey, B. Sherrill, A. Zeller
  NSCL, East Lansing, Michigan
• L. Ahle, J.L. Boles, S. Reyes, W. Stein
  LLNL, Livermore, California
• J.R. Beene, W. Burgess, H.K. Carter, D.L. Conner, T.A. Gabriel, L.K. Mansur, R. Remec, M.J. Rennich, D.W. Stracener, M. Wendel
  ORNL, Oak Ridge, Tennessee
• T.A. Bredeweg, F.M. Nortier, D.J. Vieira
  LANL, Los Alamos, New Mexico
• P. Bricault
  TRIUMF, Vancouver
• L.H. Heilbronn
  LBNL, Berkeley, California

The Department of Energy's Office of Nuclear Physics, within the Office of Science (SC), has given high priority to consider and analyze design concepts for the target areas for the production of rare isotopes via the ISOL technique at the Rare-Isotope Accelerator (RIA) Facility. Key criteria are the maximum primary beam power of 400 kW, minimizing target change-out time, good radiological protection, flexibility with respect to implementing new target concepts, and the analysis and minimization of hazards associated with the operation of the facility. We will present examples of on-going work on simulations of radiation heating of targets, surrounding components and shielding, component activation, and levels of radiation dose, using the simulation codes MARS, MCNPX, and PHITS. These results are important to make decisions that may have a major impact on the layout, operational efficiency and cost of the facility, hazard analysis, shielding design, civil construction, component design, and material selection, overall layout, and remote handling concepts.

• R.M. Ronningen, V. Blideanu, G. Bollen, D. Lawton, D.J. Morrissey, B. Sherrill, A. Zeller
  NSCL, East Lansing, Michigan
• L. Ahle, J.L. Boles, S. Reyes, W. Stein, A. Stoyer
  LLNL, Livermore, California
• J.R. Beene, W. Burgess, H.K. Carter, D.L. Conner, T.A. Gabriel, L.K. Mansur, R. Remec, M.J. Rennich, D.W. Stracener, M. Wendel
  ORNL, Oak Ridge, Tennessee
• H. Geissel, H. Iwase
  GSI, Darmstadt
• I.C. Gomes, F. Levand, Y. Momozaki, J.A. Nolen, B. Reed
  ANL, Argonne, Illinois
• L.H. Heilbronn
  LBNL, Berkeley, California

The development of high-power beam dumps and catchers, and pre-separator layouts for proposed fragment separators of the Rare-Isotope Accelerator (RIA) facility are important in realizing how to handle the 400 kW in the primary beam. We will present examples of pre-conceptual designs of beam dumps, fragment catchers, and the pre-separator layout. We will also present examples of ongoing work on radiation simulations using the heavy-ion-transport code PHITS, characterizing the secondary radiation produced by the high-power ion beams interacting with these devices. Results on radiation heating of targets, magnet coils, associated hardware and shielding, component activation, and levels of radiation dose will be presented. These initial studies will yield insight into the impact of the high-power dissipation on fragment separator design, remote handling concepts, nuclear safety and potential facility hazard classification, shielding design, civil construction design, component design, and material choices. Furthermore, they will provide guidance on detailed radiation analyses as designs mature.