| Paper | Title | Page |
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| TUPAS050 | Determination of Component Activation and Radiation Environment in the Second Stripping Region of a High-Power Heavy-Ion Linear Accelerator | 1760 |
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Funding: U. S. Department of Energy under Grant No. DE-FG02-04ER41313 In supporting pre-conceptual research and development of the Rare-Isotope Accelerator facility or similar next-generation exotic beam facilities, one critical focus area is to estimate the level of activation and radiation in the linear accelerator second stripping region and to determine if remote handling is necessary in this area. A basic geometric layout of the second stripping region having beamline magnets, beam pipes and boxes, a stripper foil, beam slits, and surrounding concrete shielding was constructed for Monte Carlo simulations. Beam characteristics were provided within the stripping region based on this layout. Radiation fields, radioactive inventories, levels of activation, heat loads on surrounding components, and prompt and delayed radiation dose rates were simulated using Monte-Carlo radiation transport code PHITS. Preliminary results from simulations using a simplified geometry show that remote handling of foils and slits will be necessary. Simulations using a realistic geometry are underway and the results will be presented. |
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| TUPAS051 | Radiation Simulations for a Pre-Separator Area for Rare Isotope Production via Projectile Fragmentation | 1763 |
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Funding: U. S. Department of Energy under Grant No. DE-FG02-04ER41313 To support pre-conceptual research and development for rare isotope beam production via projectile fragmentation at the Rare-Isotope Accelerator facility or similar next-generation exotic beam facilities, the interactions between primary beams and beryllium and liquid-lithium production targets in the fragment pre-separator area were simulated using the Monte-Carlo radiation transport code PHITS. The purpose of this simulation is to determine the magnitude of the radiation fields in the pre-separator area so that levels of hadron flux and energy deposition can be obtained. It was of particular interest to estimate the maximum radiation doses to magnet coils and other components such as the electromagnetic pump for a liquid-lithium loop, and to estimate component lifetimes. We will show a detailed geometry of the pre-separator area developed for these simulations. We will provide verification that trajectories of beams and fragments when transported in the PHITS simulations agree with results from standard ion-optics calculations. We will present estimates of radiation doses to pre-separator components and give estimates for component lifetimes. |
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| TUPAS052 | Radiation Environment at ISOL Target Station of Rare Isotope Facility | 1766 |
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| Next-generation exotic beam facilities will offer a number of approaches to produce rare isotopes far from stability. One of the approaches is the Isotope Online (ISOL) separation concept, that is, the isotope production by interactions of light ion beams with heavy nuclei of targets. A pre-conceptual design of an ISOL target station was done as part of the research and development work for the Rare Isotope Accelerator (RIA). This report summarizes the results of radiation simulations for the RIA ISOL target station. The above includes radiation effects such as: prompt doses around the target station and from neutron sky-shine; residual activation effects such as ground water, air, and component activation; life-time of target station components; and heating and cooling for target, beam dumps, and shielding. |