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Empty-bucket techniques for spill-quality improvement at the CERN Super Proton Synchrotron
/ Arrutia Sota, Pablo A (CERN) ; Fraser, Matthew A (CERN) ; Hagmann, Gregoire (CERN) ; Kain, Verena (CERN) ; Papotti, Giulia (CERN) ; Spierer, Arthur (CERN) ; Velotti, Francesco M (CERN) ; Burrows, Philip N (JAI, UK) ; Piandani, Roberto (San Luis Potosi U.)
Synchrotrons can provide long spills of particles by employing resonant extraction where the circulating beam is slowly ejected over thousands to millions of turns by exploiting the amplitude growth caused by a transverse resonance. In the CERN Super Proton Synchrotron (SPS), this method is used to satisfy the experimental requests of the North Area. [...]
2024 - 14 p.
- Published in : Phys. Rev. Accel. Beams 27 (2024) 074001
Fulltext: PDF;
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Performance of the Ion Chain at the CERN Injector Complex and Transmission Studies During the 2023 Slip Stacking Commissioning
/ Slupecki, Maciej (CERN) ; Albright, Simon (CERN) ; Alemany-Fernández, Reyes (CERN) ; Angoletta, Maria Elena (CERN) ; Argyropoulos, Theodoros (CERN) ; Bartosik, Hannes (CERN) ; Baudrenghien, Philippe (CERN) ; Bellodi, Giulia (CERN) ; Bozzolan, Michele (CERN) ; Bruce, Roderik (CERN) et al.
The 2023 run has been decisive for the LHC Ion Injector Complex. It demonstrated the capability of producing full trains of momentum slip stacked lead ions in the SPS. [...]
2024 - 4 p.
- Published in : JACoW HB 2023 (2024) 418-421
Fulltext: PDF;
In : 68th ICFA Advanced Beam Dynamics workshop on high-Intensity and High-Brightness Hadron Beams (HB 2023), CERN, Geneva, Switzerland, 9 - 13 Oct 2023, pp.418-421
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Beam Performance with the LHC Injectors Upgrade
/ zannini, C (CERN) ; Wegner, R (CERN) ; Vollinger, C (CERN) ; Veness, R (CERN) ; Velotti, F (CERN) ; Sullivan, M (CERN) ; Steerenberg, R (CERN) ; Spierer, A (CERN) ; Skowronski, P (CERN) ; Sito, L (CERN) et al.
The LHC Injectors Upgrade (LIU) project was put in place between 2010 and 2021 to increase the intensity and brightness in the LHC injectors to match the challenging requirements of the High-Luminosity LHC (HL-LHC) project, while ensuring reliable operation of the injectors complex up to the end of the HL-LHC era (ca. 2040). [...]
2024 - 8 p.
- Published in : JACoW HB 2023 (2024) 1-8
Fulltext: PDF;
In : 68th ICFA Advanced Beam Dynamics workshop on high-Intensity and High-Brightness Hadron Beams (HB 2023), CERN, Geneva, Switzerland, 9 - 13 Oct 2023, pp.1-8
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The CERN SPS Low Level RF: embedded acquisition system for the Cavity-Controller and Beam-Control commissioning and diagnostics
/ Egli, J (CERN) ; Baudrenghien, P (CERN) ; Hagmann, G (CERN) ; Spierer, A (CERN) ; Suminski, M (CERN)
The CERN SPS Low Level RF (LLRF) has undergone a major upgrade, including the complete redesign of the 200MHz Cavity-Controller and the Beam-Control during the Long Shutdown (2018-21). This upgrade was motivated by the required doubling of the beam intensity in the SPS for the High Luminosity LHC project (HL-LHC). [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) THPA095
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.THPA095
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SPS fixed target spill quality improvements in the longitudinal plane
/ Papotti, Giulia (CERN) ; Spierer, Arthur (CERN) ; Quartullo, Danilo (CERN) ; Hagmann, Gregoire (CERN) ; Karpov, Ivan (CERN) ; Piandani, Roberto (San Luis Potosi U.)
The SPS proton fixed target beams are spilled via a third integer resonant extraction, for which high momentum spread is beneficial. To increase the momentum spread prior to the slow extraction, the bunches are stretched at the unstable phase by inverting the sign of the RF voltage. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) TUPA157
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.TUPA157
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RF techniques for spill quality improvement in the SPS
/ Sota, P A Arrutia (CERN ; JAI, UK) ; Fraser, M A (CERN) ; Velotti, F M (CERN) ; Burrows, P N (JAI, UK) ; Kain, V (CERN) ; Papotti, G (CERN) ; Piandani, R (CERN ; San Luis Potosi U.) ; Roncarolo, F (CERN) ; Spierer, A (CERN) ; Vadai, M (CERN)
The CERN Super Proton Synchrotron (SPS) aims at providing stable proton spills of several seconds to the North Area (NA) fixed target experiments via third-integer resonant slow extraction. However, low-frequency power converter ripple (primarily at 50 and 100 Hz) and high-frequency structures (mainly at harmonics of the revolution frequency) modulate the extracted intensity, which can compromise the performance of the data acquisition systems of the NA experiments. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) MOPA116
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.MOPA116
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The CERN SPS Low level RF: The Cavity-Controller
/ Hagmann, Gregoire (CERN) ; Baudrenghien, Philippe (CERN) ; Egli, Julien (CERN) ; Spierer, Arthur (CERN) ; Sumiński, Maciej (CERN) ; Włostowski, Tomasz (CERN)
This paper is the second of a series of three on the Super Proton Synchrotron (SPS) Low Level RF (LLRF) upgrade. It covers the 200MHz Cavity-Controller part, that is responsible for the regulation of the accelerating field in a single SPS cavity. [...]
2022 - 4 p.
- Published in : JACoW IPAC 2022 (2022) 903-906
Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.903-906
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