Performance of the ZEUS forward plug calorimeter

With the installation of a forward plug calorimeter (FPC) the calorimetric coverage of the ZEUS detector has been extended by one unit in pseudorapidity (ZEVS FPC group, Nucl. Instr. and Meth., in print). The FPC is a compensating shashlik-type calorimeter with layers of 15 mm thick Pb and 2.6 mm thick organic scintillators. The light is read out with WLS fibers and PMTs. Before installation in ZEUS the FPC has been tested and calibrated with test beams of 10–100 GeV. Long-term stability is monitored with a 60Co source.