R. A. Antonov, S. P. Beschapov, E. A. Bonvech, D. V. Chernov, T. A. Dzhatdoev, Mir. Finger, M. Finger, V. I. Galkin, N. N. Kabanova, A. S. Petkun, D. A. Podgrudkov, T. M. Roganova, S. B. Shaulov, T. I. Sysoeva
Here is presented the current state of the SPHERE-2 balloon-borne experiment. The detector is elevated up to 1 km above the snow surface and registers the reflected Vavilov-Cherenkov radiation from extensive air showers. This method has good sensitivity to the mass-composition of the primary cosmic rays due to its high resolution near the shower axis. The detector consists of a 1500 mm spherical mirror with a 109 PMT cluster in its focus. The electronics record a signal pulse profile in each PMT. In the last 2 years the detector was upgraded: time resolution of pulse registration was enhanced up to 12.5 ns, channel sensitivity was increased by a factor of 3, a new LED-based relative PMT calibration method was introduced, and new hardware and etc. was installed.
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http://arxiv.org/abs/1210.1365
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