The days are getting longer, the trees are getting greener and it is time, too, for the CERN accelerator complex to reawaken. Following the year-end technical stop (YETS) – a 17-week period in which the accelerators undergo maintenance and minor upgrades – each accelerator in the chain has, in turn, restarted for the 2023 data-taking season. Each restart is an important step in the process of conveying protons from their source to their final destination in the Large Hadron Collider (LHC).
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The days are getting longer, the trees are getting greener and it is time, too, for the CERN accelerator complex to reawaken. Following the year-end technical stop (YETS) – a 17-week period in which the accelerators undergo maintenance and minor upgrades – each accelerator in the chain has, in turn, restarted for the 2023 data-taking season. Each restart is an important step in the process of conveying protons from their source to their final destination in the Large Hadron Collider (LHC). While most major upgrades of the machines were carried out during the long shutdown before the start of LHC Run 3, the accelerator upgrades performed during the YETS will improve physics data taking for the second year of the run. The CERN accelerator complex. (Image: CERN) It all began on 13 February 2023, when Linac4 started beam commissioning: a short period of adjusting the machine before operation began on 17 February. This linear accelerator is responsible for supplying protons to the whol