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Abstract: The method of improvement of Cherenkov angle resolution in RICH detectors using ‘focusing’ aerogel radiators (FARICH) is under investigation. The ‘focusing’ three-layer aerogel radiator was investigated using a digital radiographic device. The Monte Carlo calculations of velocity resolution based on measured variations of the refractive index in aerogel tile are presented. With the observed variations, - and K-mesons can be separated up to 8.4GeV/c, - and -mesons can be separated up to . We studied the use of sodium fluoride radiator in a RICH detector. NaF radiator extends the working momentum region for the identification down to 0.6GeV/c. It has been shown that a RICH detector with NaF radiator can achieve a competitive velocity resolution up to 5GeV/c as compared to single-layer aerogel RICH. [Copyright &y& Elsevier]

The Super Charm–Tau (SCT) Factory is a proposed electron–positron collider in Novosibirsk with a peak luminosity of 1 0 35 cm − 1 s − 1 operating in the energy range between 2and 6 GeV. The interaction region should be equipped by an excellent universal particle detector meeting the requirements of broad physics program of the experiment. Research and development for all detector subsystems is currently underway. Particle identification (PID) system of the detector is required to provide the state-of-the-art level of μ / π separation for the particle momenta up to 1. 2 GeV∕c. The following options for the PID system are considered in this paper: focusing aerogel ring imaging Cherenkov (FARICH) detector composed of 4-layer aerogel tiles, threshold Cherenkov counters based on aerogel shifter photomultiplier (ASHIPH), and time-of-flight (ToF) detector combined with the time-of-propagation (ToP) approach providing a time resolution better than 30 ps. Assessment of the charged particle separation performance for these options based on simulation and prototype tests results is presented. [ABSTRACT FROM AUTHOR]

A high performance particle identification (PID) system is essential for the successful realization of the broad physics program at the future Super C- τ Factory in Novosibirsk. The main requirements for the PID system are as follows: good π / K -separation in the entire operational momentum range and good μ ∕ π -separation in the momentum range from 0.3 to 1.2 GeV/ c. The RICH detector based on focusing aerogel radiator (FARICH) and position-sensitive photon detector meets all these requirements. The FARICH method is described, and the beam test results are presented. The FARICH system design outline for the Super C- τ Factory project is presented. Most promising photon detector options are considered. [ABSTRACT FROM AUTHOR]