Phase I Upgrade of the Readout System of the Vertex Detector at the LHCb Experiment



Fernandez Prieto, Antonio, Vazquez Regueiro, Pablo, Hennessy, Karol ORCID: 0000-0002-1529-8087, Buytaert, Jan, van Beuzekom, Martin, Lemos Cid, Edgar, Eklund, Lars, de Bruyn, Kristof, Naik, Sneha, Schiller, Manuel
et al (show 57 more authors) (2020) Phase I Upgrade of the Readout System of the Vertex Detector at the LHCb Experiment. IEEE TRANSACTIONS ON NUCLEAR SCIENCE, 67 (4). pp. 732-739.

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Abstract

This article describes the high-speed system designed to meet the challenging requirements for the readout of the new pixel VErtex LOcator (VELO) of the upgraded LHCb experiment. All elements of the electronics readout chain will be renewed to cope with the requirement of 40-MHz full-event readout rate. The pixel sensors will be equipped with VeloPix ASICs and placed at 5 mm from the Large Hadron Collider (LHC) beams in a secondary vacuum tank in an extremely high and nonhomogeneous radiation environment. The front-end (FE) ASICs with the highest occupancy will have to cope with pixel-hit rates above 900 Mhits/s using up to four 5.13-Gb/s data readout links. Each module comprises six VeloPix ASICs, wire-bonded to two FE hybrid boards, while a third hybrid will employ a GBTx ASIC as the control interface. High-speed data will reach the wall of the vacuum chamber through low-mass flexible copper tapes. A custom board routes the signals outside the vacuum tank. On the air side, an optical and power board converts the electrical high-speed signals into optical signals for transmission from the underground cavern to the off-detector electronics that process data and send them to a farm of computers for further analysis. Several tests allowing the validation of the system are described here with special emphasis on a test with proton beams that confirms the correct operation of the whole readout hardware.

Item Type: Article
Uncontrolled Keywords: Field-programmable gate array (FPGA), high energy physics (HEP) instrumentation, high-speed readout, real-time, data acquisition system, silicon detector, vertex detector
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 02 Sep 2021 09:08
Last Modified: 18 Jan 2023 21:31
DOI: 10.1109/TNS.2020.2970534
Open Access URL: https://ieeexplore.ieee.org/document/8976212
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3134976