PERFORMANCE OF A DIAMOND-TUNGSTEN SAMPLING CALORIMETER

We report here the first measurements of a diamond-tungsten sampling c alorimeter. The calorimeter consisted of twenty layers of diamond with one radiation length of tungsten per layer. The diamond layers were g rown by chemical vapor deposition and were 3.0x3.0 cm(2) wafers with a n average thickness of 500 mu m. We measured the energy response and r esolution (sigma(E)/E) of this calorimeter in 0.5-5.0 GeV electron bea ms and compared the results with those from a silicon calorimeter of s imilar construction. Our energy resolution is sigma(E)/E=(4.7+/-2.7)%/ E+(19.13+/-0.86)%/root E+(2.3+/-1.8)% for the diamond-tungsten calorim eter, where + indicates addition in quadrature. This is in good agreem ent with our result for the silicon-tungsten calorimeter of sigma(E)/E =(3.89+/-0.87)%/E+(19.73+/-0.19)%/root E+(0.0+/-1.6)%. We also compare our data with EGS simulations.