Abstract
A high-resolution beam telescope is one of the most important and demanding infrastructurecomponents at any test beam facility. Its main purpose is toprovide reference particle tracks from the incoming test beam particles to thetest beam users, which allows measurement of the performance of the device-under-test (DUT).LYCORIS, a six-plane compact beam telescope with anactive area of ∼ 10 × 10 cm2 (extensible to10× 20 cm2) was installed at the DESY II Test Beam Facility in2019, to provide a precise momentum measurement in a 1 T solenoidmagnet or to provide tracking over a large area.The overall design of Lycoris will be described as well as the performanceof the chosen silicon sensor. The 25 μm pitch micro-stripsensor used for Lycoris was originally designed for the SiD detector conceptfor the International Linear Collider. It adopts a second metallization layerto route signals from strips to the bump-bonded KPiX ASIC and uses a wire-bondedflex cable for the connection to the DAQ and the power supply system. Thisarrangement eliminates the need for a dedicated hybrid PCB. Its performancewas tested for the first time in this project. The system has been evaluatedat the DESY II Test Beam Facility in several test-beam campaigns and has demonstrated an averagesingle-point resolution of 7.07 μm.
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