Development of a large active area beam telescope based on the SiD microstrip sensor

A beam telescope as one of the most important and often requested test beam equipment provides particle tracking to test beam users. At the DESY II test beam facility, a new beam telescope called Lycoris based on a microstrip sensor has been designed to address the user demands for momentum measurement in a 1 T solenoid magnet or large area tracking with limited space (3.5 cm between the potential user device and the magnet inner wall). Lycoris is designed to provide a high-precision resolution of at least ∼ 10 µm along the bending direction, and a large active area of 10 × 10 cm 2 to cover at least 90% of the beam particles at energies of 1-6 GeV. The microstrip sensor was originally designed for the Silicon Detector (SiD) at the International Linear Collider (ILC), which adopted a hybrid-less design, i.e. a second metallization layer is used to route signals from strips to the bump-bonded ASIC, and from the ASIC to a wire-bond pad to the outside. This hybrid-less arrangement eliminates the need for a complex hybrid design, and its functioning is first-time tested in this project. The performance of the sensor modules was firstly tested in the lab then at the DESY II test beam facility in August/September 2018, and the results will be presented here. In addition, a summary will be given at the end with an overview of the ongoing test beam campaign of the Lycoris prototype in February 2019