1–6 Jun 2025
Taipei International Convention Center (TICC)
Asia/Taipei timezone

Achievement of LIU longitudinal parameters at the CERN SPS

TUPS028
3 Jun 2025, 16:00
2h
Exhibiton Hall A _Salmon (TWTC)

Exhibiton Hall A _Salmon

TWTC

Poster Presentation MC4.A04 Circular Accelerators Tuesday Poster Session

Speaker

Giulia Papotti (European Organization for Nuclear Research)

Description

To prepare the Super Proton Synchrotron (SPS) as an injector for the High Luminosity Large Hadron Collider (HL-LHC), its Radiofrequency (RF) system was majorly upgraded. The 200 MHz travelling wave structures were rearranged, adding two solid-state power amplifiers and a new Low-Level RF (LLRF) system. The increase in RF power and reduction of the beam coupling impedance at the fundamental frequency were designed for capture and acceleration of four trains of 72 bunches spaced by 25 ns at an intensity of 2.3e11 protons per bunch with bunch lengths of 1.65 ns ±10% at SPS extraction. These beam parameters have first been demonstrated in 2024 after careful optimisation of all the main longitudinal settings: voltage program at fundamental and higher harmonics, interplay of one turn-delay feedback, feedforward and longitudinal damper, as well as controlled emittance blow-up. This contribution details the achieved beam parameters and the conditions that allowed them, along with the encountered limitations.

Region represented Europe
Paper preparation format LaTeX

Author

Giulia Papotti (European Organization for Nuclear Research)

Co-authors

Alexandre Lasheen (European Organization for Nuclear Research) Carlo Zannini (European Organization for Nuclear Research) Elena de la Fuente (European Organization for Nuclear Research) Francesco Velotti (European Organization for Nuclear Research) Giovanni Rumolo (European Organization for Nuclear Research) Hannes Bartosik (European Organization for Nuclear Research) Ingrid Mases (European Organization for Nuclear Research) Ivan Karpov (European Organization for Nuclear Research) Jake Flowerdew (University of Oxford) Kevin Li (European Organization for Nuclear Research) Konstantinos Paraschou (European Organization for Nuclear Research) Leandro Intelisano (European Organization for Nuclear Research) Lotta Mether (European Organization for Nuclear Research) Michael Schenk (École Polytechnique Fédérale de Lausanne)

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