An iron-scintillator tile calorimeter with tower readout geometry was const
ructed for the photoproduction experiment FOCUS (E831) at Fermilab. This ex
periment ran in the 1996-1997 Fermilab-fixed target program using a wide ba
nd photon beam with an average energy of 170 GeV. The hadron calorimeter wa
s used in an online trigger. A description of this tile sampling calorimete
r is given and its performance described. (C) 1999 Elsevier Science B.V. Al
l rights reserved.