A prototype liquid argon preshower detector with a strip granularity of 2.5 mm has been tested at the CERN SPS in front of a liquid argon Accordion calorimeter. For charged tracks a signal-to-noise ratio of 9.4 and a space resolution of 340 mum were measured; the rejection power against overlapping photons produced in the decay of 50 GeV pi0's is larger than 3; the precision on the electromagnetic shower direction, determined together with the calorimeter, is better than 7 mrad above 40 GeV; the calorimeter performance behind the preshower (approximately 4X0) is fully preserved. These results make such a detector attractive for future operation at the CERN Large Hadron Collider.
PERFORMANCE OF A LIQUID ARGON PRESHOWER DETECTOR INTEGRATED WITH AN ACCORDION CALORIMETER / B. AUBERT, A. BAZAN, B. BEAUGIRAUD, J. COLAS, T. LEFLOUR, M. MAIRE, J. VIALLE, I. WINGERTERSEEZ, Y. ZOLNIEROWSKI, H. GORDON, V. RADEKA, D. RAHM, D. STEPHANI, N. BULGAKOV, J. CHEVALLEY, C. FABJAN, D. FOURNIER, O. GILDEMEISTER, P. JENNI, M. NESSI, F. NESSITEDALDI, M. PEPE, W. RICHTER, J. SODERQVIST, V. VUILLEMIN, J. BAZE, L. GOSSET, P. LAVOCAT, J. LOTTIN, B. MANSOULIE, J. MEYER, J. RENARDY, J. TEIGER, H. ZACCONE, G. BATTISTONI, D. CAMIN, D. CAVALLI, G. COSTA, A. CRAVERO, A. FERRARI, F. GIANOTTI, L. MANDELLI, M. MAZZANTI, L. PERINI, G. PESSINA, M. SCIAMANNA, E. AUGE, R. CHASE, J. CHOLLET, C. DELATAILLE, L. FAYARD, A. HRISOHO, P. JEAN, G. LEMEUR, B. MERKEL, J. NOPPE, G. PARROUR, P. PETROFF, J. REPELLIN, A. SCHAFFER, N. SEGUIN, G. UNAL, C. FUGLESANG, M. LEFEBVRE. - In: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT. - ISSN 0168-9002. - 330:3(1993), pp. 405-415. [10.1016/0168-9002(93)90569-4]
PERFORMANCE OF A LIQUID ARGON PRESHOWER DETECTOR INTEGRATED WITH AN ACCORDION CALORIMETER
L. Perini;
1993
Abstract
A prototype liquid argon preshower detector with a strip granularity of 2.5 mm has been tested at the CERN SPS in front of a liquid argon Accordion calorimeter. For charged tracks a signal-to-noise ratio of 9.4 and a space resolution of 340 mum were measured; the rejection power against overlapping photons produced in the decay of 50 GeV pi0's is larger than 3; the precision on the electromagnetic shower direction, determined together with the calorimeter, is better than 7 mrad above 40 GeV; the calorimeter performance behind the preshower (approximately 4X0) is fully preserved. These results make such a detector attractive for future operation at the CERN Large Hadron Collider.
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