Beam tests of a CCD tracker for vertex detector application

We have studied the performance of a CCD tracker using minimum ionizing particles (MIP's) from KEK PS beam line. The detector consists of three layers of CCD sensors manufactured by Hamamatsu Photonics, which suppress the dark current at surface by one order of magnitude compared with that of the conventional ones. We have observed MIP's can be detected with su#cient signal to noise ratio even up to +5 # C. The position resolution as well as the detection e#ciency of this detector are also given. 1 Introduction Vertex detectors will play a crucial role to investigate TeV physics at future linear colliders [1]. CCD (Charge Coupled Device) is one of the best candidates for this application because of its unambiguous reconstruction capability (2 dimensional pixels), less occupancy (large granularity) and less multiple scattering (thin detector)) [2]. For future linear collider application, we have been studying properties of CCD at room temperature in order to achieve a compact #...