Speaker
Description
In oder to increase the maximum achievable intensity of medium charge state heavy ion beams in SIS18 at GSI for FAIR-operation, the installation of cryoinserts is foreseen. These cryogenic surfaces with high sticking probability provide high pumping speed, where most of the beam-loss induced gas desorption takes place. Such, gas particles get quickly removed, minimizing beam loss by charge exchange from interaction with the residual gas.
A prototype cryoinsert was designed, manufactured and tested, showing the clear reduction of artificial gas pulses. Most recently, the prototype was installed into SIS18. There, a reduction of the static pressure extending several meters after cooldown was observed.
In 2025 the first beam experiments with medium charged Uranium beams and the cryoinserts took place to observe their influence. The charge exchange could be measured, showing a significant decrease due to the cryoinserts and also a slight influence on the transmission through an acceleration cycle was measurable.
In the meantime, a series production of cryoinserts is prepared, including improvements and simplifications of the design.
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