R & D of the Mobile Telescope Array Project for Very High Energy Cosmic Gamma-Ray Observations

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The "Mobile Telescope Array" is a large-scale array of relocatable imaging atmospheric Cherenkov telescopes and proposed as a future Very High Energy (VHE) gamma-ray observatory. Various R & D have been carried out aiming to realize the relocatable telescope which is a new technology in this field. Such telescope should be independent of power cables for easier relocation and operated using only batteries. To this end, a low power consumption data acquisition system was developed and high capacity batteries were investigated. For calibrating telescope attitudes effectively after each relocation, an automatic calibration system utilizing GPS was also developed and estimated. An atmospheric Cherenkov telescope as a test bench for R & D has been located at the Akeno Observatory of the Institute for Cosmic Ray Research, the University of Tokyo, and will be maintained for various R & D of future VHE projects.