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Title |
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| MOPO-14 |
Ion Beam Production from Rare Isotopes with GSI ECR Ion Sources
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97 |
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- K. Tinschert, R. Lang, J. Maeder, J. Rossbach, P. Spaedtke
GSI, Darmstadt
- A. Yakushev
Technische Universitat Munchen, Garching
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ECR ion sources (ECRIS) of CAPRICE-type, working at 14.5 GHz, are in use at the High Charge State Injector (HLI) of the accelerator facility at GSI for beam production and at a test bench for development work. The ECRIS is mostly used to produce ion beams from rare isotopes because of its high efficiency and low material consumption. Depending on their material properties beams of rare isotopes are produced from gases, gaseous compounds, solid materials or solid compounds. Gases can be used directly, while solids have to be transformed into the gaseous state for the ECR plasma which is achieved by using resistively heated ovens. As enriched materials are produced by isotopic separation processes their composition including contamination by impurities can be of importance for the handling in the evaporation process and can be detrimental for the beam user if the ion beam contains additional ion species. Characteristics and suitable treatment of materials and production processes will be described. Experimental investigations with different sample materials and operational experiences will be reported.
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| THCO-B02 |
Low Energy Beam Transport for Ion Beams Created by an ECR
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213 |
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- P. Spaedtke
GSI, Darmstadt
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It has been shown previously that the emittance of an ion beam, extracted from an Electron Cyclotron Resonance Ion Source (ECRIS) is determined by magnetic field, applied electric potentials, geometry, and particle density together with the initial properties of these particles. The model used for computer simulation seems to fit the experimental results: ions are extracted from the ion source if they are created (started) at places where magnetic field lines are going through the extraction aperture. Furthermore, the absolute value of magnetic flux density relative to the flux density at the extraction aperture defines, whether this ion can be extracted. Due to coupling between the different projections of phase space because of the magnetic field, several assumptions used for beam transport issues are not valid any more. With increasing extracted currents, space charge compensation of the extracted beam becomes an important issue. This compensation will build up in a relatively short time, depending on the pressure, as long no leackage is present within the beam line.
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Slides
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