Reconstruction Techniques and Tests Using the HiRes Prototype

Shower geometrical reconstruction procedures for the proposed high resolution Fly's Eye ( HiRes ) have been developed using Monte Carlo simulations which include effects of optical aberrations and photomultiplier signal statistical fluctuations. These procedures have been tested using pulsed laser beams of known geometry, observed by the HiRes Prototype. Sets of laser shots fired with directional differences as small as 0.1 ° have been clearly resolved. Monte Carlo simulations have estimated the angular resolution of stereo reconstruction of showers with a 2 site HiRes. With these results, the estimated sensitivity of HiRes to any EeV point sources is about 1.5 orders of magnitude greater than that of the original Fly's Eye.