The NA62 experiment at CERN SPS, aimed to measure ∼80 events of very rare decay K+→Π+ ν anti-ν (BR∼8.5×10-10), poses stringent requirements on PID capabilities to reject the overwhelming Kμ2(63%) and Kμ2(21%) backgrounds. The photon veto system must provide a rejection factor of 10-8 on Π0 decays. As main γ veto detector, the NA48 liquid Kr calorimeter will be used. To have full geometrical acceptance, a set of 12 veto stations will be placed along the vacuum decay tank, with an inefficiency <10-4 in a wide energy range (50 MeV-35 GeV). Good energy resolution (∼10% at 1 GeV) for threshold definition, good time resolution (∼1 ns) to be used at the trigger level, sensitivity to mip, for calibration with muons of the beam halo are needed. We performed an intense R&D program on 3 solutions. Studies have been performed at the Frascati BTF beam and all 3 meet the efficiency requirements. The final choice uses a peculiar radial arrangement of lead glasses in rings. Studies on the front-end electronics are under way. The first full veto station has been constructed installed and tested at CERN. ©2009 IEEE.
The photon veto system for the NA62 rare kaon decay experiment / Ambrosino, F., Antonelli, A., Costantini, F., D'Agostini, G., Dulach, B., Fantechi, R., Lamanna, G., Leonardi, E., Mannelli, I., Massarotti, P., Moulson, M., Napolitano, M., Palladino, V., Raffaelli, F., Raggi, M., Romano, A., Saracino, G., Serra, M., Spadaro, T., Valente, P., et al.. - (2009), pp. 1019-1024. (2009 IEEE Nuclear Science Symposium Conference Record, NSS/MIC 2009 Orlando; United States 2009) [10.1109/NSSMIC.2009.5402436].
The photon veto system for the NA62 rare kaon decay experiment
D'Agostini, G.;Raggi, M.;
2009
Abstract
The NA62 experiment at CERN SPS, aimed to measure ∼80 events of very rare decay K+→Π+ ν anti-ν (BR∼8.5×10-10), poses stringent requirements on PID capabilities to reject the overwhelming Kμ2(63%) and Kμ2(21%) backgrounds. The photon veto system must provide a rejection factor of 10-8 on Π0 decays. As main γ veto detector, the NA48 liquid Kr calorimeter will be used. To have full geometrical acceptance, a set of 12 veto stations will be placed along the vacuum decay tank, with an inefficiency <10-4 in a wide energy range (50 MeV-35 GeV). Good energy resolution (∼10% at 1 GeV) for threshold definition, good time resolution (∼1 ns) to be used at the trigger level, sensitivity to mip, for calibration with muons of the beam halo are needed. We performed an intense R&D program on 3 solutions. Studies have been performed at the Frascati BTF beam and all 3 meet the efficiency requirements. The final choice uses a peculiar radial arrangement of lead glasses in rings. Studies on the front-end electronics are under way. The first full veto station has been constructed installed and tested at CERN. ©2009 IEEE.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
