CERN Accelerating science

Internal Note
Report number	CERN-ACC-NOTE-2021-0027
Title	PRACTICAL CHALLENGES OF THE LHC MAIN BEAM DUMP UPGRADES
Author(s)	Martin Ruiz, Jose Maria (CERN) ; Kershaw, Keith (CERN) ; Calviani, Marco (CERN) ; Grenier, Damien (CERN) ; Maestre Heredia, Jorge ; Torregrosa Martin, Claudio Leopoldo (Universidad de Oviedo (ES)) ; Buonocore, Luca Rosario (CERN) ; Serrano Galvez, Pablo ; Matheson, Eloise (CERN) ; Sola Merino, Jorge ; Guinchard, Michael (CERN) ; Ferrari, Matteo (CERN) ; Senajova, Dominika (Imperial College (GB)) ; Bertone, Caterina (CERN) ; Perez Ornedo, Maria (CERN) ; Infantino, Angelo (CERN) ; Tromel, Christophe (CERN)
Corporate author(s)	CERN. Geneva. ATS Department
Publication	2021
Imprint	18 Oct 2021
Number of pages	8
Subject category	Accelerators and Storage Rings
Keywords	LHC Beam Dump System, Run 3, BID, dump
Abstract	The two Large Hadron Collider (LHC) beam dumps have to withstand arduous operating conditions and are essential for the safe and reliable operation of the collider. During the LHC Long Shutdown 2 (2019-2020), extensive work was carried out to upgrade the dumps to cope with the more demanding future operating conditions of the LHC Run 3. The upgrades included modifications to the dump blocks, dump block supports and their lubrication, beam windows, the beam pipes leading to the dumps, and the nitrogen pressurisation system of the dump blocks. A comprehensive instrumentation system was installed to monitor the behaviour of the dumps. In addition, an internal endoscope inspection was performed on the ex-operational dumps to check their condition. Many of these operations had to be carried out in underground radiation areas, therefore the optimization of the dose-to-personnel according to the ALARA principle was an important consideration. The return on experience for these activities will be provided, including the critical tasks, unexpected events and lessons learnt.
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