We have studied the combined performance of two calorimeters, the high resolution uranium-scintillator prototype of the ZEUS forward calorimeter (FCAL), followed by a prototype of the coarser ZEUS backing calorimeter (BAC), made out of thick iron plates interleaved with planes of aluminium proportional chambers. The test results, obtained in an exposure of the calorimeter system to a hadron test beam at the CERN-SPS, show that the backing calorimeter does fulfil its role of recognizing the energy leaking out of the FCAL calorimeter. The measurement of this energy is feasible, if an appropriate calibration of the BAC calorimeter is performed. (orig.).
Abramowicz, H;  Czyrkowski, H; Derlicki, A; Krzyzanowski, M; Kudla, I; Kusmierz, W; Nowak, R J; Pawlak, J M; Rajca, A; Stopczynski, A; Walczak, R; Zarnecki, A F;  Kowalski, T Z;  ZEUS-BAC Group
- Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
- Warsaw Univ. (Poland). Inst. Fizyki Doswiadczalnej
- Akademia Gorniczo-Hutnicza, Krakow (Poland). Inst. of Physics and Nuclear Techniques