Characterization of the prototype CMOS pixel sensor JadePix-1 for the CEPC vertex detector

The proposed Circular Electron Positron Collider (CEPC) will allow precision Higgs measurements. To meet the stringent physics requirements, its vertex detector will have to be constructed with the state-of-the-art pixel detector technologies that promise high spatial resolution, low power consumption and low material budget. We have conducted R&D based on the emerging CMOS pixel sensor technology and developed the first prototype JadePix-1. In this paper, we describe the sensor structures that are primarily designed to evaluate the impacts of diode geometry on charge collection. We present the detailed test results obtained with radioactive sources and electron beams, and the sensor performance before and after neutron irradiation up to 1013 1 MeV neq/cm2.