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IHEP 96 - 57
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| A.M. Blick, V.A. Kachanov, G.V. Khaustov, V.N. Kolosov,A.A. Lednev S.A. Polovnikov, V.A. Polyakov, Yu.D. Prokoshkin, V.D. Samoylenko, P.M. Shagin, A.V. Shtannikov, A.V. Singovsky, V.P. Sugonyaev (IHEP, Protvino, Russia), M.V. Korzhik (Institute of Nuclear Problems, Minsk, Belarus), J.P. Peigneux (Laboratoire d'Annecy de Physique des Particules, Annecy-le-Vieux, France) | ||
| First operation of the PWO crystal calorimeter as a mass spectrometer in a heavy-load high energy physics experiment | ||
| Protvino, 1996.- p.8, figs 3, refs.:19. | ||
The lead tungstate ($PWO$) heavy crystal calorimeter is tested in a GAMS-type experiment detecting 50,000 $\pi^o$-mesons produced in 32.5~GeV/c intensive $\pi^-$~beam of the 70~GeV IHEP accelerator. In spite of a huge beam load of the calorimeter cells (up to 10$^6~\pi^{-}/s$), a clean $\pi^{o} \rightarrow 2\gamma$ signal is observed. The measured $PWO$ spectrometer mass resolution is in a good accord with previous electron beam tests and GEANT calculations. A high precision of the real-time $PWO$ spectrometer calibration, using the $\pi^{o}$ signal during physics run, is achieved. The results of these very first spectrometric beam tests confirm a high performance of multicell $PWO$ spectrometers in heavy-load high energy physics experiments of both fixed target and collider types (LHC, etc.).
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