AVS 53rd International Symposium
    Vacuum Technology Wednesday Sessions
       Session VT-WeM

Paper VT-WeM3
Ion-Induced Desorption Yields for U@super 73+@ and Ar@super 10+@ Ions at 15-100 MeV/u

Wednesday, November 15, 2006, 8:40 am, Room 2000

Session: Electron, Photon and Ion-beam Induced Desorption and Their Effects on the Dynamics of Accelerators
Presenter: E. Hedlund, Uppsala University, Sweden
Authors: H. Kollmus, GSI, Germany
M. Bender, GSI, Germany
M.C. Bellachioma, GSI, Germany
E. Mahner, CERN, Switzerland
A. Kraemer, GSI, Germany
L. Westerberg, Uppsala University, Sweden
E. Hedlund, Uppsala University, Sweden
O.B. Malyshev, CCLRC Daresbury Laboratory, UK
H. Reich-Sprenger, GSI, Germany
Correspondent: Click to Email
During operation of the heavy ion accelerators at CERN, GSI and BNL large pressure rises, up to several orders of magnitude, due to ion beam-loss induced desorption have been observed. In order to get a better understanding of these phenomena at intermediate energies we have measured desorption yields, @eta@, (released molecules per incident ion) for 15, 40 and 100 MeV/u U@super 73+@ beam on samples of 316LN stainless steel, 6028 aluminum and OFE copper. In a second experiment we used 40, 80 and 100 MeV/u Ar@super 10+@ beam on a 316LN stainless steel sample. The experiment was done in a UHV setup at GSI in Darmstadt, Germany. From the desorption yields, calculated from the measured pressure rises, as a function of energy loss, dE/dx, we deduced power laws in the order n=2-4. This is compared with theoretical power-law models for sputtering.