In beam test of the new Time-of-Flight spectrometer for the 8πLP setup based on the CORSET concept A. Brondi 1 , A. Di Nitto 1 , G. La Rana 1 , R. Moro 1 , M. Trotta 1 , E. Vardaci 1 , A.Ordine 1 , A. Boiano 1 , A. Chizhov 2 , G.N. Kniajeva 2 , N.A. Kondratiev 2 , E.M. Kozulin 2 , M. Cinausero 3 , E. Fioretto 3 , P. Mastinu 3 , G. Prete 3 , V. Rizzi 3 , N. Gelli 4 , F. Lucarelli 4 1 Dipartimento di Scienze Fisiche and INFN, Napoli,2 Flerov Laboratory of Nuclear Reactions, JINR, 141980 Dubna, Russia, 3 INFN, Laboratori Nazionali di Legnaro, 4 Dipartimento di Fisica and INFN, Firenze INTRODUCTION The detection capability of fission fragments in the 8πLP apparatus has been improved, in the framework of the FIESTA collaboration, with the design of a new Time- of-Flight spectrometer based on the CORSET concept from the FLNR in Dubna [1]. The basic system consists of four arms mounted on opposite sides of the beam, each arm containing a START and a STOP detector. The STOP detectors are position sensitive. The information of the time of flight and of the position of the fragments in each respective arm along with the two-body kinematics allows the reconstruction of the masses and kinetic energies of the fragments. The START and STOP detectors use a system of microchannel plates and allow to achieve a time resolution of ~180ps measured with a triple alpha source. From our simulations, it is possible to achieve a mass resolution of ≈1 amu with a flight path of 30 cm. THE 4-ARM TOF SPECTROMETER In order to install the full spectrometer system in the 8πLP support frame we have designed and produced three types of pyramidal capsules out of carbon fibre. Each one has such a shape to fit inside the frame of the BALL. Each capsule contains a START and a STOP set of detectors (Fig.1). Standard NIM electronics (CFDs and TACs) is used to guarantee a time resolution of ~180ps. FIG.1: the START and STOP detectors and the carbon fiber capsule Four arms have been mounted inside the frame as shown in Fig.2. Mechanical work is in progress to guarantee a more precise anchoring of the STOP detectors inside the capsules. FIG.2: the TOF arms mounted inside the 8πLP frame The full system of 4 arms has been tested with the reaction 32 S + 109 Ag at E lab = 180 MeV. This reaction has been chosen because the M-TKE distribution of the fission fragments has been measured by the CORSET setup in a different experiment. In this report a brief account will be given of the preliminary data processing. FIG.3: TOF-TOF matrix