The LHCb VELO Upgrade module construction


Akiba, K ORCID: 0000-0002-6736-471X, Alexander, M ORCID: 0000-0002-8148-2392, Bertella, C ORCID: 0000-0002-3160-147X, Biolchini, A ORCID: 0000-0001-6064-9993, Bitadze, A ORCID: 0000-0001-7979-1092, Bogdanova, G ORCID: 0009-0000-9524-4670, Borghi, S ORCID: 0000-0001-5135-1511, Bowcock, TJV ORCID: 0000-0002-3505-6915, Bridges, K, Brock, M et al (show 77 more authors) (2024) The LHCb VELO Upgrade module construction. Journal of Instrumentation, 19 (06). P06023-P06023. ISSN 1748-0221, 1748-0221

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Abstract

<jats:title>Abstract</jats:title> <jats:p>The LHCb detector has undergone a major upgrade for LHC Run 3. This Upgrade I detector facilitates operation at higher luminosity and utilises full-detector information at the LHC collision rate, critically including the use of vertex information. A new vertex locator system, the VELO Upgrade, has been constructed. The core element of the new VELO are the double-sided pixelated hybrid silicon detector modules which operate in vacuum close to the LHC beam in a high radiation environment. The construction and quality assurance tests of these modules are described in this paper. The modules incorporate 200 μm thick, n-on-p silicon sensors bump-bonded to 130 nm technology ASICs. These are attached with high precision to a silicon microchannel substrate that uses evaporative CO<jats:sub>2</jats:sub>  cooling. The ASICs are controlled and read out with flexible printed circuits that are glued to the substrate and wire-bonded to the chips. The mechanical support of the module is given by a carbon fibre plate, two carbon fibre rods and an aluminium plate. The sensor attachment was achieved with an average precision of 21 μm, more than 99.5% of all pixels are fully functional, and a thermal figure of merit of 3 Kcm<jats:sup>2</jats:sup>W<jats:sup>-1</jats:sup> was achieved. The production of the modules was successfully completed in 2021, with the final assembly and installation completed in time for data taking in 2022.</jats:p>

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 40 Engineering, 51 Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 26 Jun 2024 15:03
Last Modified: 09 Dec 2024 18:20
DOI: 10.1088/1748-0221/19/06/p06023
Open Access URL: https://iopscience.iop.org/article/10.1088/1748-02...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3182434
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