AMANDA is a high-energy neutrino telescope presently under construction at
the geographical South Pole. In the Antarctic summer 1995/96, an array of 8
0 optical modules (OMs) arranged on 4 strings (AMANDA-B4) was deployed at d
epths between 1.5 and 2 km. In this paper we describe the design and perfor
mance of the AMANDA-B4 prototype, based on data collected between February
and November 1996. Monte Carlo simulations of the detector response to down
-going atmospheric muon tracks show that the global behavior of the detecto
r is understood. We describe the data analysis method and present first res
ults on atmospheric muon reconstruction and separation of neutrino candidat
es. The AMANDA array was upgraded with 216 OMs on 6 new strings in 1996/97
(AMANDA-B10), and 122 additional OMs on 3 strings in 1997/98. (C) 2000 Else
vier Science B.V. All rights reserved.