Author/Authors :
Palestini، نويسنده , , S. and Barr، نويسنده , , G.D. and Biino، نويسنده , , C. and Calafiura، نويسنده , , P. and Ceccucci، نويسنده , , A. and Cerri، نويسنده , , C. and Chollet، نويسنده , , J.C. and Cirilli، نويسنده , , M. and Cogan، نويسنده , , J. and Costantini، نويسنده , , F. and Crépé، نويسنده , , S. and Cundy، نويسنده , , D. and Fantechi، نويسنده , , R. and Fayard، نويسنده , , L. and Fischer، نويسنده , , G. and Formica، نويسنده , , A. and ، نويسنده ,
Abstract :
The subject of space charge due to positive ions slowly moving in parallel plate ionization chambers is considered. A model for the degradation of the detector response is developed, with particular emphasis on electromagnetic calorimeters.The topics discussed include: (a) the stationary; (b) the time dependent cases; (c) the limit of very large space charge; (d) the electric field dependence of the electron drift velocity; (e) the effect of longitudinal development of showers; (f) the behaviour of the average reductions of response; (g) the non-uniformity of response for different positions of the shower axis inside the cell defined by the electrodes. The NA48 calorimeter is used as application and for comparison of results.
Keywords :
Ionization detectors , Space charge , ion mobility , Electromagnetic calorimeters , Liquid noble gases
