CERN Accelerating science

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Internal Note
Report number CERN-ACC-NOTE-2022-0006
Title Start collisions at 1m β∗ (MD 3349)
Author(s) Calia, Andrea (CERN) ; Jacquet, Delphine (CERN) ; Wenninger, Jorg (CERN) ; Fuchsberger, Kajetan ; Hostettler, Michi (CERN)
Corporate author(s) CERN. Geneva. ATS Department
Publication 2021
Imprint 05 Dec 2021
Number of pages 6
Subject category Accelerators and Storage Rings ; Accelerators and Storage Rings
Accelerator/Facility, Experiment CERN LHC
Keywords operation ; luminosity ; levelling ; orchestration
Abstract This document summarises the LHC Machine Development session on colliding at β∗ = 1 m and squeezing with colliding beams to β∗ = 25 cm in IP 1 and 5 using the capabilities of the LumiServer. To do so, the beams were brought into collision at the end of the ramp without playing the regular squeeze to 30 cm. Once in collision, the β∗ levelling functionality of the LumiServer was used to squeeze and de-squeeze the beams in two cycles between β∗ = 1 m and β∗ = 25 cm. After each squeeze step, a luminosity optimization scan was performed in IP 1 and 5 to assess the orbit stability, ensuring that the beams remained in collisions.
Submitted by [email protected]

 


 Element opprettet 2022-01-27, sist endret 2022-01-27


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