Abstract
Conversion of an electron beam to a positron beam is obtained at the end of the first four accelerating guides of the Frascati linac, using an electron current of 200 mA peak, at 85 MeV, having a pulse width of 4 μs and a repetition rate variable between 3 and 250 pps. Two different fixed targets have been designed: a high average power target used to produce a high duty cycle (4 μs, 250 pps) positron beam for nuclear physics experiments, and a high positron production efficiency, low average power target, used for injection of positrons into the storage ring, Adone, when a beam repetition rate of only 3 pps is allowed, but a high positron yield is required, to reduce the ring filling time.
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