| Paper | Title | Page |
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| THPAN088 | Optical Effects of Energy Degraders on the Performance of Fragment Separators | 3426 |
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Funding: This work was supported by the U. S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357 An exotic beam facility for the production of rare isotopes requires investigation of higher order optical effects, while taking into account beam-material interactions. An important component of the fragment separator is the absorber wedge, which is necessary for isotope separation. The properties of the absorber, such as the type and shape of material used, determine the resolution and transmission of the fragment separator. Nuclear reactions such as the fission and fragmentation of radioactive isotopes within the target or absorber contribute to the phase space and isotopic distributions of the beam. We have computed these distributions for all isotopes emerging from the target or absorber by implementing a limited fission model from within COSY Infinity that uses polynomial interpolations. Higher order optical aberrations have been computed and successfully eliminated by the shaping of the absorber material. COSY allows us to find the parameters of the absorber that maximize the resolution and transmission of the fragment separator. In addition, beam purity tests have been performed. From our results we have determined an appropriate location for a dump of the primary beam. |
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| THPAS035 | Code development for Next-Generation High-Intensity Large Acceptance Fragment Separators | 3576 |
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Funding: This work was supported by the U. S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357 An Exotic Beam Facility is one of the highest priority projects in the DOE 20-year plan and a major strategic initiative for Argonne. The main components of the facility are a high-power multi-beam superconducting heavy-ion accelerator, a production complex, and finally a high-efficiency post-accelerator. This talk revolves around new approaches to heavy-ion beam dynamics for the central part, the Fragment Separators. To this end, it will summmarize the theories developed, software written, and simulations done that lead to better understanding of basic beam dynamics, more insight towards the best design choices, and optimization of the system?s parameters, including the integrated beam optics-nuclear physics approach. |