Abstract
Ion-optics calculations done to improve the transmission of ions through the 5-MV tandem at the University of Helsinki are described. The injector was modelled using matrix calculations including space charge as implemented in the Graphic Transport code. Acceptance of the accelerator was calculated with the Simion 7.0 code for different injection energies and terminal voltages. Angular spread of the ions in the stripper gas (CO2) was estimated and resulting maximum emittance of the accelerator was obtained by ray-tracing ions from the stripper through the high-energy accelerating tubes. A beam with the maximum emittance from the accelerator was the calculated through the high-energy AMS beam line with the program COSY Infinity. The calculations show that it is possible to obtain high transmission for the AMS beam line.
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