Properties of a time-of-flight telescope for heavy ions in the A= 100 range

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Abstract

Properties of a time-of-flight telescope have been studied with iodine, bromine and lighter ions in the energy range from 1 to 2.4 MeV/amu. A system detecting secondary electrons emitted from a 10–20 μg/cm2 thick carbon foil by an open multiplier was used as zero-time detector. It shows an improving time resolution for ions with higher mass (250 ps for iodine), which cause a higher secondary electron yield. Strong degradation of timing characteristics of the surface barrier stop detector was observed at an integrated dose of about 108 iodine ions/cm2. Further applications of the time-of-flight technique, as the possibility of achieving a Z-identification with a double flight time measurement and a better energy resolution using the time-of- flight information are discussed.

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    Supported by GSI, Darmstadt, Germany.

    Present address: Lawrence Berkeley Laboratory, Building 71, Berkeley, California 94720, U.S.A.

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