  The Tangerine project aims to develop new state-of-the-art high-precision
silicon detectors. Part of the project has the goal of developing a monolithic
active pixel sensor using a novel 65 nm CMOS imaging process, with a small
collection electrode. This is the first application of this process in particle
physics, and it is of great interest as it allows for an increased logic
density and reduced power consumption and material budget compared to other
processes. The process is envisioned to be used in for example the next ALICE
inner tracker upgrade, and in experiments at the electron-ion collider.
  The initial goal of the three-year Tangerine project is to develop and test a
sensor in a 65 nm CMOS imaging process that can be used in test beam telescopes
at DESY, providing excellent spatial resolution and high time resolution, and
thus demonstrating the capabilities of the process. The project covers all
aspects of sensor R&D, from electronics and sensor design using simulations, to
prototype test chip characterisation in labs and at test beams. The sensor
design simulations are performed by using a powerful combination of detailed
electric field simulations using technology computer-aided design and
high-statistics Monte Carlo simulations using the Allpix Squared framework. A
first prototype test chip in the process has been designed and produced, and
successfully operated and tested both in labs and at test beams.
