SCINTILLATION SCREEN INVESTIGATIONS FOR HIGH CURRENT ION BEAMS AT GSI LINAC

Scintillation screens are widely used for qualitative beam profile monitoring. However, precise measurements might yield ambivalent results, especially for high beam currents. We have investigated the optical properties of various scintillating materials with different beams in the energy range 5.5 to 11.4 MeV/u delivered by the heavy ion linac at GSI. Investigations were not only focused on well-known sensitive scinitillators but also on ceramic materials with lower light yield. Their properties (yield, beam width, higher statistical moments) were compared to different quartz glasses. The image of each macro-pulse was recorded by a digital CCD camera and indi-vidually evaluated. For some materials, a decrease of the light yield occurs. For a focused beam, the imaged widt