Abstract
A theoretical model to describe the vacuum instability induced by the lost particles in heavy-ion accelerators is proposed and applied to the U +28 beam lifetime measurements in the SIS18 at GSI, where the instability is of concern for high-intensity operation. The method allows to derive values of the desorption yield, the charge-exchange cross-section and the total pumping speed from the measurements of the beam lifetime I( t). The obtained desorption yields are comparable with those found in the other heavy-ion machines. Directions of possible cures are discussed.
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