Status of the Design of the Antiproton Production Area

Every 10 s, the antiproton-production-target will be bombarded by a pulse of 2×10 primary protons with an energy of 29 GeV (for an overview see [1]). This corresponds to a total beam power of about 10 kW. After passing of the first dipole primary protons and antiprotons are no longer in-line and the primaries have to be dumped. Behind the target a significant part of the beam power is carried by secondary particles, thus only about 4 kW will be deposited in the beam dump. The Monte-Carlo particle transport code FLUKA [2] was used to optimize the design of the beam dump (see fig. 1). It will consist of three materials: i) Graphite for a smooth stopping of the beam. Its activation is very low. ii) Iron: the high density allows an effective stopping of the particles, thus a relatively small size of the dump can be achieved. However, the activation is high due to the relatively high nuclear charge of iron. iii) Concrete: its activation is low, it is needed to shield the remnant activity produced in iron and it is, compared to iron, very inexpensive.