VERITAS employs a 12m segmented mirror and pixellated photomultiplier tube camera to detect the brief pulse of Cherenkov radiation produced by the extensive air shower initiated by a cosmic high-energy gamma ray. The VERITAS data acquisition system consists of a 500 Mega-Sample-PerSecond custom-built flash ADC system, which samples the Cherenkov light pulse every 2 nanoseconds. The integrated c...

Beside comparatively low energy Cherenkov gluons observed at RHIC, there could be high energy gluons at LHC, related to the high energy region of positive real part of the forward scattering amplitude. In both cases they give rise to particles emitted along some cone. The characteristics of the cones produced by these two types of gluons are different. Therefore different experiments are needed...

Abstract In this study, a new type of photonic crystal (PC) designed as transmitter. The transmittance spectra the one-dimensional (1D) which are consist silicon dioxide/magnesium fluoride (SiO 2 /MgF ). We simulated results using different incident angles, and showed high (99.5%) within wavelength range (200–700 nm). Simulations two-dimensional (2D) crystals were studied, well values investiga...

Gaseous detectors using multiple gas electron multiplier (GEM) electrodes permit to attain large amplification factors with a strong suppression of photon and ion-mediated feedback. With the first GEM in a cascade coated with a photosensitive layer, they provide efficient and fast single photon detection, with excellent position resolution. General performances of CsI-coated multi-GEM detectors...