• O.B. Malyshev
  ASTeC, Daresbury
• M.C. Bellachioma, H. Kollmus, A. Krämer, H. Reich-Sprenger
  GSI, Darmstadt
• M. Bender
  LMU, München
• M. Leandersson
  KTH Physics, Stockholm
• E. Hedlund, L. Westerberg
  Uppsala University/Dept. Phys. and Astr., Uppsala
• A. Krasnov
  BINP, Novosibirsk
• B. Zajec
  JSI, Ljubljana

Funding: This work was performed with support from the EUFP6 Program DIRAC-PHASE-1.

Intensity of heavy ion accelerators can be limited by beam induced pressure instability; if pumping is insufficient, pressure will steadily grow reducing the beam lifetime. There is a need of input parameters for vacuum modelling and design of safe UHV systems for updated and new heavy ion accelerators, such as the FAIR facility at GSI, as well as an intention to gain a deeper understanding of the desorption process required an experimental investigation of the ion induced desorption yields (number of released molecules per incident ion) from different materials commonly used in particle accelerators. The experimental data have been obtained with perpendicular incidence beams with an experimental setup based on the throughput method located at the Svedberg laboratory in Uppsala (Sweden). The investigated materials were ¹¹⁶In, Cu, etched Cu, gold coated Cu and Ta and the chosen beams were 5 MeV/u Ar⁸⁺, 9.6 MeV/u Ar⁹⁺ and 17.7 MeV/u Ar¹²⁺. The samples can be biased, which means that the amount of secondary outgoing positive and negative particles during ion bombardment could be investigated. A few samples were also bombarded with grazing incident angle. A summary of the results will be reported.