A New High Energy Photon Tagger for the H1 - Detector at HERA
V. F. Andreev, A. S. Belousov, A. M. Fomenko, L. A. Gorbov, T. Greenshaw, S. V. Levonian, E. I. Malinovski, S. J. Maxfield, I. P. Sheviakov, P. A. Smirnov, Yu. V. Soloviev, G. -G. Winter
Abstract
The H1 detector at HERA has been upgraded by the addition of a new electromagnetic calorimeter. This is installed in the HERA tunnel close to the electron beam line at a position 8m from the interaction point in the electron beam direction. The new calorimeter extends the acceptance for tagged photoproduction events to the high y range, 0.85 < y < 0.95, and thus significantly improves the capability of H1 to study high energy gamma-p processes. The calorimeter design, performance and first results obtained during the 1996-1999 HERA running are described.
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