[en] The NA62 experiment is designed to measure the very rare kaon decay K⁺→π⁺νν at the CERN SPS with a 10% accuracy. The Standard Model prediction for the branching ratio is (8.5±0.7)x10^-11. One of the challenging aspects of the experiment is the suppression of the K⁺→μ⁺ν_μ background at the 10^-12 level. To satisfy this requirement a Ring Imaging Cherenkov Detector (RICH), able to separate π± from μ^± in the momentum range between 15 and 35 GeV/c, with a μ misidentification probability better than 10^-2, is needed. The RICH must also have a time resolution of about 100 ps to disentangle accidental time associations of beam particles with pions. The RICH will have a very long focal length (17m) and will be filled with Ne gas at atmospheric pressure. Two tests beam were held at CERN in 2007 and 2009 with a RICH prototype. The results of the two tests beam will be presented: the μ misidentification probability is found to be about 0.7% and the time resolution better than 100 ps in the whole momentum range.

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[en] The BaBar experiment is projected to study CP violation in B decays. Muon detection and K_L⁰ identification are achieved by an instrumented flux return (IFR) system based on resistive plate chamber detectors. In this paper the general layout of the IFR system will be described. (orig.)

[en] The main goal of the KLOE experiment at the Frascati DAPHINE phi-factory is the study CP violation in kaon decays. The tracking device of the experiment is a drift chamber whose dimensions, 4 m of diameter and 3.3 m length, provide a large acceptance volume for the decay products of low momentum K_L (λ_L=3.4 m). A complete stereo geometry with 12.582 cells arranged in 58 layers guarantees a high and uniform efficiency in the reconstruction of the charged K_L decays. Very light materials have been chosen both for the drift medium, a helium-based gas mixture, and for the mechanical structure, made of carbon fiber, to minimize multiple scattering and conversion of low-energy photons. The design requirements, the adopted solutions together with the calibration procedure and the tracking performances of the drift chamber are discussed

[en] A commercial small refrigerator system has been integrated to a large superconducting spectrometer magnet to cool its thermal shield and anchors. It has been in operation for more than 10,000 hours without major troubles. The refrigerator has cooling power of 60 W for thermal shield at 80 K and 6 W for anchors at 20 K. The magnet is kept below the liquid nitrogen temperature even when the main refrigerator system is turned off, and the cool-down time of the large superconducting magnet is considerably shortened. Operation of the large superconducting magnet has become much easier thanks to the small refrigerator system. (author)

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[en] A cerenkov counter design is given for operation in a 500 GeV/c secondary beam with 10⁹ to 10¹¹ particles per 1 millisecond spill. The design allows the fractions of pions, kaons and protons to be determined. In particular the fraction of kaons should be measured with a relative accuracy of a few percent

[en] Variants of Cherenkov radiation ring spectrometers with hodoscopic photomultipliers intended for identify π, K, p with momentum upto 300 GeV/c are considered. Basic characteristics of spectrometers and ways of their further development are presented