ИСТИНА

A new method for high energy cosmic ray detection was suggested by A.E.Chudakov in 1972. According to this method a reflected from the snow surface Cherenkov light is observed by an optical camera lifted above the surface on the balloon. Optical system of the SPHERE-2 detector consists of 1500mm diameter spherical mirror and has 1sr view angle. Shmidt aperture diaphragm allows to reach 109 pixel optical resolution on the focal surface of the mirror. Electronic part of the detector consists of 109 pulse shape acquisition FADC channels with 25 ns steps. The dynamic range in each channel is equal to 10000 due to using of two 10-bit ADC. PMTs have 109 autoranging high-voltage power supplies that allow to set optimal PMT sensitivity according to the light conditions of measurements. Trigger system allows to separate on the PMTs mosaic light spot images of Cherenkov light reflected from the snow surface.