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Effects of Cavity Pre-Detuning on RF Power Transients at Injection into the LHC
/ Karlsen-Bæck, Birk Emil (CERN ; Rome U.) ; Argyropoulos, Theodoros (CERN) ; Butterworth, Andrew (CERN) ; Calaga, Rama (CERN) ; Karpov, Ivan (CERN) ; Timko, Helga (CERN) ; Zampetakis, Michail (CERN)
At injection into the LHC, the RF system is perturbed by beam-induced voltage resulting in strong RF power transients and the instant detuning of the cavities. The automatic tuning system, however, needs time for the mechanical compensation of the resonance frequency to take place. [...]
2024 - 4 p.
- Published in : JACoW HB 2023 (2024) 530-533
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.530-533
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2.
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Effects of cavity pre-detuning on RF power transients at injection into the LHC
/ Karlsen-Baeck, B E (CERN ; Rome U.) ; Argyropoulos, T (CERN) ; Butterworth, A (CERN) ; Calaga, R (CERN) ; Karpov, I (CERN) ; Timko, H (CERN) ; Zampetakis, M (CERN)
At injection into the Large Hadron Collider (LHC), the radiofrequency (RF) system is perturbed by beam-induced voltage resultingin strong RF power transients and the instant detuning of thecavities. The automatic tuning system, however, needs time for themechanical compensation of the resonance frequency to takeplace. [...]
2024 - 8 p.
- Published in : JINST 19 (2024) T04005
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.T04005
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3.
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LHC MD 6945: Injection Power Transients
/ Karlsen-Baeck, Birk Emil (Sapienza Universita e INFN, Roma I (IT)) ; Argyropoulos, Theodoros (CERN) ; Butterworth, Andy (CERN) ; Calaga, Rama (CERN) ; Damerau, Heiko (CERN) ; Dlugosz, Dominika Agnieszka ; Karpov, Ivan (CERN) ; Timko, Helga (CERN) ; Zampetakis, Michail (CERN)
This note summarizes the procedure and results from the RF MD that was performed to study power transients and klystron saturation at injection. [...]
CERN-ACC-NOTE-2024-0002.
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2024. - 12 p.
Full text
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Degradation and Recovery of the LHC RF Cryomodule Performance Using the Helium Processing Technique
/ Turaj, Katarzyna (CERN) ; Brunner, Olivier (CERN) ; Butterworth, Andrew (CERN) ; Gerigk, Frank (CERN) ; Maesen, Pierre (CERN) ; Montesinos, Eric (CERN) ; Peauger, Franck (CERN) ; Therasse, Mathieu (CERN) ; Venturini Delsolaro, Walter (CERN)
The LHC RF cryomodule "Asia" suffered an accidental influx of about 0.5 l of tunnel air during the leak checks of the pumping manifolds. The resulting risk of particle contamination was difficult to assess, and could not be excluded with certainty. [...]
2022 - 5 p.
- Published in : JACoW SRF 2021 (2022) 746-750
Fulltext: PDF;
In : 20th International Conference on RF Superconductivity (SRF 2021), Online, US, 28 Jun - 2 Jul 2021, pp.746-750
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LHC rf system performance in 2017
/ Timko, H (CERN) ; Baudrenghien, P (CERN) ; Brunner, O (CERN) ; Butterworth, A (CERN) ; Shaposhnikova, E (CERN) ; Turaj, K (CERN) ; Valuch, D (CERN)
The availability of the LHC ADT and RF systems in 2017 is presented in details,
including high-and low-power RF and RF controls. A comparison with 2016
availability is performed [...]
2019 - 5 p.
- Published in : (2019) , pp. 63-67
Fulltext: PDF;
In : 8th Evian Workshop on LHC beam operation, Evian Les Bains, France, 12 - 14 Dec 2017, pp.63-67
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Reusable Real-Time Software Components for the SPS Low Level RF Control System
/ Sumiński, Maciej (CERN) ; Adrianek, Karol (CERN) ; Bielawski, Bartosz Przemyslaw (CERN) ; Butterworth, Andrew (CERN) ; Egli, Julien (CERN) ; Hagmann, Gregoire (CERN) ; Kuzmanović, Predrag (CERN) ; Novel González, Saul (CERN) ; Rey, Anthony (CERN) ; Spierer, Arthur (CERN)
In 2021 the Super Proton Synchrotron has been recommissioned after a complete renovation of its low level RF system (LLRF). The new system has largely moved to digital signal processing implemented as a set of functional blocks (IP cores) in Field Programmable Gate Arrays (FPGAs) with associated software to control them. [...]
2022 - 3 p.
- Published in : JACoW ICALEPCS2021 (2022) 939-941
Fulltext: PDF;
In : 18th International Conference on Accelerator and Large Experimental Physics Control Systems, Online, 18 - 22 Oct 2021, pp.939-941
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White Rabbit and MTCA.4 Use in the LLRF Upgrade for CERN’s SPS
/ Włostowski, Tomasz (CERN) ; Adrianek, Karol (CERN) ; Arruat, Michel (CERN) ; Baudrenghien, Philippe (CERN) ; Butterworth, Andrew (CERN) ; Daniluk, Grzegorz (CERN) ; Egli, Julien (CERN) ; Gill, John (CERN) ; Gingold, Tristan (CERN) ; González Cobas, Juan (CERN) et al.
The Super Proton Synchrotron (SPS) Low-level RF (LLRF) system at CERN was completely revamped in 2020. In the old system, the digital signal processing was clocked by a submultiple of the RF. [...]
2022 - 6 p.
- Published in : JACoW ICALEPCS2021 (2022) 847-852
Fulltext: PDF;
In : 18th International Conference on Accelerator and Large Experimental Physics Control Systems, Online, 18 - 22 Oct 2021, pp.847-852
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Code Generation Tools and Editor for Memory Maps
/ Plutecki, Przemyslaw (CERN) ; Bielawski, Bartosz Przemyslaw (CERN) ; Butterworth, Andrew (CERN)
Cheburashka, a toolset created in the Radio Frequency Group at CERN, has become an essential part of our hardware and software developments. Due to changing requirements, this toolset has been recently rewritten in C++ and Python. [...]
2020 - 4 p.
- Published in : 10.18429/JACoW-ICALEPCS2019-MOPHA115
Fulltext: PDF;
In : 17th Biennial International Conference on Accelerator and Large Experimental Physics Control Systems (ICALEPCS), New York, United States, 5 - 11 Oct 2019, pp.MOPHA115
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First demonstration of the use of crab cavities on hadron beams
/ Calaga, R (CERN) ; Alekou, A (Manchester U.) ; Antoniou, F (CERN) ; Appleby, R B (Manchester U.) ; Arnaudon, L (CERN) ; Artoos, K (CERN) ; Arduini, G (CERN) ; Baglin, V (CERN) ; Barriere, S (CERN) ; Bartosik, H (CERN) et al.
Many future particle colliders require beam crabbing to recover geometric luminosity loss from the nonzero crossing angle at the interaction point (IP). A first demonstration experiment of crabbing with hadron beams was successfully carried out with high energy protons. [...]
2021 - 6 p.
- Published in : Phys. Rev. Accel. Beams 24 (2021) 062001
Fulltext: PDF;
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RF System Availability and Performance during Run 2
/ Turaj, K (CERN) ; Arnaudon, L (CERN) ; Baudrenghien, P (CERN) ; Brunner, O (CERN) ; Butterworth, A (CERN) ; Gerigk, F (CERN) ; Montesinos, E (CERN) ; Shaposhnikova, E (CERN) ; Timko, H (CERN) ; Valuch, D (CERN)
The Run 2 operation and availability for the LHC RF system are presented,
including year-to-year performance comparisons. In addition, the evolution of
the present RF system is discussed, with improvements in diagnostics, operation,
and software being highlighted. [...]
2019 - 4 p.
- Published in : , pp. 99-102
Fulltext: PDF;
In : 9th LHC Operations Evian Workshop, Evian Les Bains, France, 30 Jan - 1 Feb 2019, pp.99-102
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