No abstract available

[en] Measurements of the energy loss and energy-loss straggling of relativistic bare heavy ions (Z>18) demonstrate systematic deviations from the first Born approximation (Bethe and Bohr theories). Besides the projectile influence on the stopping characteristics, the density and the structure of the target material modifies the slowing-down properties. Measurements of the energy-loss distributions of relativistic uranium ions at 300 MeV/u in a silicon crystal under random and channeling conditions are presented. Furthermore, the small influence of ferromagnetism in target on stopping power for helium ions is discussed. (author)

No abstract available

[en] A semi-empirical formula for the lifetimes of stripper foils exposed to ion beams including beam and target properties is given. The lifetimes are mainly determined by lattice damage and depend exponentially on the foil temperatures in the temperature region between 300 K and 1200 K. (orig.)

[en] Targets of 0.7-1.0 mg/cm² lead (sup(nat)Pb,²⁰⁶Pb,²⁰⁷Pb,²⁰⁸Pb) of large size (44 mm x 15 mm) have been prepared and covered on both sides with C foils of 0.02-0.03 mg/cm². 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 10¹³s^-1cm^-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. (orig.)

No abstract available

[en] Thin metal oxide targets are useful in experiments with heavy ion beams of high current densities, because these targets can stand higher temperatures than metal foils. With commercial electron guns we prepared isotopically enriched CaO, Nd₂O₃, Sm₂O₃, Gd₂O₃ and SiO₂ targets of thicknesses from 80 to 250 μg cm^-2 with yields of about 20% of the isotope materials consumed. Self-supporting W and Mo foils of thicknesses from 100 to 500 μg cm^-2 with surface areas of about 3 cm² were produced with an electron gun. The thermal behaviour of the W foils in an electron beam has been studied. A device for reductive evaporation with an electron beam is described. (orig.)

[en] Temperatures of thin self-supporting foils of tantalum and titanium in a pulsed electron beam of various intensities and pulse durations have been measured. The experimental results are in agreement with temperatures calculated under the assumption that the energy loss due to heat conduction can be neglected in comparison with the loss due to thermal radiation. (Auth.)

No abstract available

[en] A versatile magnetic spectrometer for atomic and nuclear physics experiments is presented. Some examples of its use are given. (A.S.)