Status of the Fair Synchrotrons Sis100 and Sis300
نویسندگان
چکیده
System Design and Ionization Beam Loss The world wide unique operation with high intensity, intermediate charge state heavy ions (e.g. U) is one of the most demanding features of the FAIR project [1]. Due to the high cross sections for ionisation in combination with ion induced gas desorption, significant beam loss may result from pressure bumps during the acceleration cycle. As described in [2], the SIS100 lattice has been optimised for the control of ionisation beam loss with the goal to restrict the dynamics of the residual gas pressure. For the simulation of vacuum dynamics and beam loss due to charge changing processes, the program STRAHLSIM has been developed [3]. In 2008, the beam scrubbing effect and the dependence of the pumping speed of NEG-coated and cryogenic surfaces as a function of the number of mono-layers of adsorbed gases have been accounted. Thereby, long term simulations and predictions on the ionization beam loss, the number of extracted ions, the pumping power, the number of monolayer and the mean residual gas pressure have been enabled.
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تاریخ انتشار 2009