Charged particle detector array: 45 0 -175 0

The K500 superconducting cyclotron (SCC) at the Variable Energy Cyclotron Centre, Kolkata, is expected to deliver a large variety of ion beams over a wide range of energies (~50 70 MeV protons, ~10 50 MeV/A medium heavy ions with A < 60 and ~5 20 MeV/A heavier ions). At this energy, a hot and compressed nuclear system will be formed which will deexcite through multifragmentation process. The study of these mutifragments will help to understand the properties of hot nuclear matter e.g., equation of state, phase transition (liquid gas), dynamics of nuclear collisions, isoscaling etc. A complete experimental investigation of these properties requires to detect and identify all most all the reaction products, their energy, multifragment correlation etc. For this purpose a 4π Charged Particle Detector Array (CPDA) is being developed at VECC under super conducting cyclotron utilization project (SUCCUP). According to the types of detection system, the array can be divided into three parts; (A) extreme forward part ( = 3-7) consists of plastic phoswitch detectors, (B) forward part ( = 7-45) consists of three layer highly granular charged particle telescope Si strip-Si strip-4 CsI(Tl) with 256 pixel and (C) backward part ( = 45-175) with all parts have  coverage 0360 as shown in schematic diagram shown in Fig 1. Here in this report, the details of backward part will be discussed.