CERN Accelerating science

Article
Report number	arXiv:2404.13615 ; LHCb-DP-2024-001 ; LHCb-PAPER-2024-001
Title	The LHCb VELO Upgrade module construction
Author(s)	Akiba, K. (NIKHEF, Amsterdam) ; Alexander, M. (Glasgow U.) ; Bertella, C. (Manchester U.) ; Biolchini, A. (NIKHEF, Amsterdam) ; Bitadze, A. (Manchester U.) ; Bogdanova, G. (Higher Sch. of Economics, Moscow) ; Borghi, S. (Manchester U.) ; Bowcock, T.J.V. (Liverpool U.) ; Bridges, K. (Liverpool U.) ; Brock, M. (Oxford U.) ; Burke, A.T. (Manchester U.) ; Buytaert, J. (CERN) ; Byczynski, W. (CERN) ; Carroll, J. (Liverpool U.) ; Coco, V. (CERN) ; Collins, P. (CERN) ; Davis, A. (Manchester U.) ; De Aguiar Francisco, O. (Manchester U.) ; De Bruyn, K. (U. Groningen, VSI) ; De Capua, S. (Manchester U.) ; De Roo, K. (NIKHEF, Amsterdam) ; Doherty, F. (Glasgow U.) ; Douglas, L. (Glasgow U.) ; Dufour, L. (CERN) ; Dumps, R. (CERN) ; Dutta, D. (Manchester U.) ; Eklund, L. (Uppsala U.) ; Elvin, A. (Manchester U.) ; Farry, S. (Liverpool U.) ; Fernandez Prieto, A. (Santiago de Compostela U., IGFAE) ; Franco Lima, V. (Liverpool U.) ; Freestone, J. (Manchester U.) ; Fuzipeg, C. (Manchester U.) ; Galati, M.D. (NIKHEF, Amsterdam) ; Gallas Torreira, A. (Santiago de Compostela U., IGFAE) ; Geertsema, R.E. (NIKHEF, Amsterdam) ; Gersabeck, E. (Manchester U.) ; Gersabeck, M. (Manchester U.) ; Grant, F. (Glasgow U.) ; Halewood-leagas, T. (Liverpool U.) ; Hennessy, K. (Liverpool U.) ; Hulsbergen, W. (NIKHEF, Amsterdam) ; Hutchcroft, D. (Liverpool U.) ; Hynds, D. (NIKHEF, Amsterdam) ; Jans, E. (NIKHEF, Amsterdam) ; John, D. (NIKHEF, Amsterdam) ; John, M. (Oxford U.) ; Jurik, N. (CERN) ; Ketel, T. (NIKHEF, Amsterdam) ; Klaver, S. (NIKHEF, Amsterdam) ; Kopciewicz, P. (AGH-UST, Cracow) ; Kostiuk, I. (NIKHEF, Amsterdam) ; Kraan, M. (NIKHEF, Amsterdam) ; Langstaff, M. (Manchester U.) ; Latham, T. (Warwick U.) ; Leflat, A. (Higher Sch. of Economics, Moscow) ; Lemos Cid, E. (Santiago de Compostela U., IGFAE) ; Lukashenko, V. (NIKHEF, Amsterdam) ; Merk, M. (NIKHEF, Amsterdam) ; Milovanovic, M. (CERN) ; Monk, M. (Warwick U.) ; Murray, D. (Manchester U.) ; Nasteva, I. (Rio de Janeiro Federal U.) ; Oblakowska-Mucha, A. (AGH-UST, Cracow) ; Pajero, T. (Oxford U.) ; Parkes, C. (Manchester U.) ; Pazos Alvarez, A. (Santiago de Compostela U., IGFAE) ; Trigo, E. Perez (Santiago de Compostela U., IGFAE) ; Perry, M. (Manchester U.) ; Reiss, F. (Manchester U.) ; Rinnert, K. (Liverpool U.) ; Rodriguez Rodriguez, E. (Santiago de Compostela U., IGFAE) ; Rovekamp, J. (NIKHEF, Amsterdam) ; Sanders, F. (NIKHEF, Amsterdam) ; Scantlebury Smead, L.G. (Oxford U.) ; Schiller, M. (Glasgow U.) ; Shears, T. (Liverpool U.) ; Smith, N.A. (Liverpool U.) ; Snoch, A. (NIKHEF, Amsterdam) ; Svihra, P. (Manchester U.) ; Szumlak, T. (AGH-UST, Cracow) ; van Beuzekom, M. (NIKHEF, Amsterdam) ; van Overbeek, M. (NIKHEF, Amsterdam) ; Vazquez Regueiro, P. (Santiago de Compostela U., IGFAE) ; Volkov, V. (Higher Sch. of Economics, Moscow) ; Wormald, M. (Liverpool U.) ; Zunica, G. (Manchester U.)
Publication	2024-06-17
Imprint	2024-04-21
Number of pages	66
In:	JINST 19 (2024) P06023
DOI	10.1088/1748-0221/19/06/P06023
Subject category	hep-ex ; Particle Physics - Experiment ; physics.ins-det ; Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; LHCb
Abstract	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 \mum 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$_2$ 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 $\mathrm{\mu m}$, more than 99.5% of all pixels are fully functional, and a thermal figure of merit of 3 Kcm^2W^{-1}$ 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.
Copyright/License	publication: © 2024 CERN (License: CC-BY-4.0) preprint: (License: CC BY 4.0)

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