Abstract
The LHCb experiment is searching for new physics and performing high-precision measurements of CP violation with the high rate of beauty and charmed hadrons produced in the pp collisions at LHC. The LHCb detector is set-up as a single-armed forward spectrometer with excellent tracking and particle identification capabilities. A part of the tracking system measuring the particle trajectories to a very high precision is formed by the Silicon Tracker. This paper reports on the performance of the Silicon Tracker during the data taking at LHC. Furthermore, it shows radiation damage studies based on leakage currents and also on charge collection efficiency scans for the first time.
Highlights
– Twelve layers – Thickness: 320 (1 sensor, 11 cm) or 410 μm (2 sensors, 22 cm); Pitch: 198 μm – ∼ 130k read out channels – Total area: 4.2 m2 – Detector operated at 0◦ C ⇒ sensors at ∼ 8◦ C – 98.71 % of channels working
– Signal-to-Noise ratio in good agreement with expectations – Hit resolution close to what is expected from binary resolution – Monitoring of radiation damage using leakage currents and charge collection efficiency scans ⇒ good agreement with expectations
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Summary
– Twelve layers – Thickness: 320 (1 sensor, 11 cm) or 410 μm (2 sensors, 22 cm); Pitch: 198 μm – ∼ 130k read out channels – Total area: 4.2 m2 – Detector operated at 0◦ C ⇒ sensors at ∼ 8◦ C – 98.71 % of channels working. The test beam results within 10-20% – IT: 16.5 (Long), 17.5 (Short) Ag–reTeTm: 1e2n-t1t5o. the test beam results within 10-20% – IT: 16.5 (Long), 17.5 (Short)
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