Desorption yields of differently treated copper samples characterized with ERDA

In heavy ion accelerators the beam line vacuum is affected by lost ions impinging onto the wall of the beam pipe. Due to ion-induced desorption gas is released from the beam pipe into the vacuum. This vacuum degradation affects the ion beam life time and is a serious luminosity limitation for a heavy ion synchrotron like SIS18 at GSI. Here we report on a new approach measuring desorption yields parallel to an in situ target characterization using elastic recoil detection analysis (ERDA). With this experimental setup we are able to show clear correlations between oxide layers and the desorption behavior, even though the sputtered oxide is not the major content of the released gas.