Obiettivo Modern high-energy experiments require a very high luminosity and thus require that, at least close to the beam, the calorimeters are radiation hard to more than a Grad, ultra fast (total pulse less than 20 ns) and with rate capability better than 50 MHz. It is mandatory for these experiments to measure particle energy in the full solid angle in order to detect missing transverse energy which is an important signature of new physics processes. A new calorimetry was invented at CRN Strasbourg 3 years ago, where quartz optical fibres (which have been measured in advance to resist more than 2.5 Grad) are imbedded in an absorber medium (lead or copper). The showers are detected by the Cerenkov light in UV sensitive photo-multipliers, the light being produced by the Cerenkov effect due to the passage of the shower particles in the fibres. As a result, the total pulse is very short (<10 ns), the rate better than 100 MHz and the transverse size of the apparent shower very small (< 10 cm compared to ~ 30 cm for normal hadronic calorimetry). This allows a better signal/background ratio in case of jets, and a better efficiency at the edges of the detector, especially at high speeds. The threshold in the Cerenkov effect also makes the system totally insensitive to the huge neutron flux present in these experiments and to the resulting huge radioactivity that will be created in these detectors. the participants in the study will investigate how to make the best quartz fibres and study carefully their radiation resistance in the UV light, how to implement these fibres in the absorber, and how to determine the jet positions. Small electromagnetic prototypes will be built, and tested at CERN. All this aims at the best and most advanced calorimeter for a LHC detector. ITEP, Moscow, has a great knowledge in quartz fibres and their irradiation. CRN, Strabourg, has already completed two theses on this new calorimetry and, with the help of Bologna University, built two prototypes, tested them at CERN and found the results to be in agreement with Monte-Carlo programmes, thus showing that the new technique was a very good answer to these difficult questions. Programma(i) IC-INTAS - International Association for the promotion of cooperation with scientists from the independent states of the former Soviet Union (INTAS), 1993- Argomento(i) 13 - High Energy Physics Invito a presentare proposte Data not available Meccanismo di finanziamento Data not available Coordinatore Centre National de la Recherche Scientifique Contributo UE Nessun dato Indirizzo Rue du Loess 23 67037 Strasbourg Francia Mostra sulla mappa Costo totale Nessun dato Partecipanti (2) Classifica in ordine alfabetico Classifica per Contributo UE Espandi tutto Riduci tutto Institute for Theoretical and Experimental Physics Russia Contributo UE Nessun dato Indirizzo 117259 Moscow Mostra sulla mappa Costo totale Nessun dato Università degli Studi di Bologna Italia Contributo UE Nessun dato Indirizzo Via Irnerio 46 40126 Bologna Mostra sulla mappa Costo totale Nessun dato
