Two different technologies are considered for the Beam Calorimeters of the ILC detector. Simulation studies of the performance have been done for a diamond-tungsten sandwich calorimeter and for a homogeneous heavy element crystal calorimeter with optical fiber readout. Studies of the stability and the linearity of a polycrystalline diamond were done for the diamond-tungsten option. For the heavy crystal option the light yield reduction due to the wavelength shifting fiber readout was studied.
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