Speaker
Description
The Electron-Ion Collider (EIC) Project is the next plan for nuclear physics in the United States. It is the first polarized electron-proton and electron-nucleus collider which opens new areas of quantum chromodynamics (QCD) physics and expands the richness of nuclear and hadron physics. Accurate particle identification performance is essential to achieving the physics goals. A compact detector is planned to cover large acceptance with about a 1.5 T magnetic field. The particle identification detector must be put at a small radius since low transverse momentum particles are curled up and cannot achieve the large radius layer. Time-of-flight measurement is a technique often used to identify particle species in a wide range of fields. However, the EIC detector with a small radius requires about 30ps and 30μm for timing and spatial (rφ) resolution, respectively. It is difficult to fulfill the requirements with conventional gas detectors, e.g., Multi-Gap Resistive Plate Chambers, and new technologies need to be developed. In this context, AC-coupled Low-Gain Avalanche Diode (AC-LGAD) technology is of interest because it fulfills both timing and spatial resolution requirements. It is a n+-in-p type silicon sensor with embedded a p+ gain layer for an amplification function under n+ implant. In Japan, AC-LGAD has been developed at Hamamatsu Photonics and KEK and already has reached the practical stage for EIC. However, the readout part is open for discussion to suit the EIC experiment. Based on these situations, the plan of the EIC-Japan collaboration commitment to AC-LGAD development will be introduced in this presentation.
