Abstract
Targets of 0.7–1.0 mg/cm 2 lead ( natPb, 206Pb, 207Pb, 208Pb) of large size (44 mm × 15 mm) have been prepared and covered on both sides with C foils of 0.02–0.03 mg/cm 2. Due to the higher total hemispherical emissivity of C in relation to Pb the radiation cooling of these targets in an intense heavy ion beam is increased and the target temperature decreased. The targets were mounted on a wheel that rotates in synchronization with the pulsed beam of the accelerator UNILAC at GSI and were irradiated by 10 13 s −1 cm −2 Ar ions of 5 MeV/u specific energy without being destroyed by melting. These targets on the wheel sustained an about 15 times higher beam current density than stationary targets. Different modes of rotation are discussed.
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