CERN Accelerating science

Published Articles
Title	LHC cryogenics – new experience of run with increased beam energy and intensity
Author(s)	Brodzinski, K (CERN) ; Claudet, S (CERN) ; Delikaris, D (CERN) ; Delprat, L (CERN) ; Ferlin, G (CERN) ; Rogez, E (CERN) ; Tavian, L (CERN)
Publication	2017
Number of pages	9
In:	IOP Conf. Ser. Mater. Sci. Eng. 171 (2017) 012156
In:	26th International Cryogenic Engineering Conference and International Cryogenic Materials Conference 2016, New Delhi, India, 7 - 11 Mar 2016, pp.012156
DOI	10.1088/1757-899X/171/1/012156
Subject category	Accelerators and Storage Rings
Abstract	After the LHC first long shut down (LS1), when necessary consolidation and maintenance activities were performed on different technical systems, the Large Hadron Collider was progressively cooled down from ambient to operation temperatures from May of 2014. Prior to physics run with increased beam energy to 6.5 TeV/beam, increased beam intensity and modified beam injection scheme, several qualifications and tests affecting cryogenic system have been performed to ensure stable run of the accelerator. New beam parameters were gradually applied to the accelerator, reducing operational margins of cryogenic capacity from previous run. The process optimization and related updates in the control system were applied. This paper will briefly recall the main consolidations performed on the cryogenic system during LS1. The cool down process and behaviour of the cryogenic system during qualifications and tests will be presented. Difficulties and applied solutions during the run will be discussed. The availability and helium losses statistics for full year operation of 2015 will be given.
Copyright/License	publication: (License: CC-BY-3.0)

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