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1.
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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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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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3.
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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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4.
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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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5.
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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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6.
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Operation Experience with the LHC ACS RF System
/ Turaj, Katarzyna (CERN) ; Arnaudon, Luca (CERN) ; Baudrenghien, Philippe (CERN) ; Brunner, Olivier (CERN) ; Butterworth, Andrew (CERN) ; Gerigk, Frank (CERN) ; Karppinen, Mikko (CERN) ; Maesen, Pierre (CERN) ; Montesinos, Eric (CERN) ; Peauger, Franck (CERN) et al.
The LHC accelerating RF system consists of two cryomodules per beam, each containing four single-cell niobium sputtered 400.8 MHz superconducting cavities working at 4.5 K and an average accelerating voltage of 2 MV. The paper summarises the experience, availability and evolution of the system within 10 years of operation. [...]
SRF2019.-
2019 - 4 p.
- Published in : 10.18429/JACoW-SRF2019-THP031
Fulltext: PDF;
In : 19th International Conference on RF Superconductivity, Dresden, Germany, 30 Jun - 05 Jul 2019, pp.913-916
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7.
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Machine protection experience from beam tests with crab cavity prototypes in the CERN SPS
/ Lindstrom, Bjorn (CERN ; Uppsala U. (main)) ; Bartosik, Hannes (CERN) ; Bohl, Thomas (CERN) ; Butterworth, Andrew (CERN) ; Calaga, Rama (CERN) ; Carver, Lee (CERN ; U. Liverpool (main)) ; Kain, Verena (CERN) ; Levens, Thomas (CERN) ; Papotti, Giulia (CERN) ; Secondo, Raffaello (CERN) et al.
Crab cavities (CCs) constitute a key component of the High Luminosity LHC (HL-LHC) project. In case of a failure, they can induce significant transverse beam offsets within tens of microseconds, necessitating a fast removal of the circulating beam to avoid damage to accelerator components due to losses from the displaced beam halo. [...]
CERN-ACC-2019-158.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-MOPMP036
Preprint: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPMP036
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8.
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Usage of the Transverse Damper Observation Box for High Sampling Rate Transverse Position Data in the LHC
/ Carver, Lee (CERN) ; Buffat, Xavier (CERN) ; Butterworth, Andrew (CERN) ; Höfle, Wolfgang (CERN) ; Iadarola, Giovanni (CERN) ; Kotzian, Gerd (CERN) ; Li, Kevin (CERN) ; Métral, Elias (CERN) ; Ojeda Sandonís, Miguel (CERN) ; Söderén, Martin (CERN) et al.
The transverse damper observation box (ADTObsBox) is a device that makes accessible the bunch-by-bunch turn-by-turn data recorded from the pickups of the LHC transverse damper. This device can provide online transient analysis of different beam dynamics effects (tunes and damping times at injection, for example), while also under development is an online coherent instability triggering system. [...]
CERN-ACC-2017-117.-
2017 - 4 p.
- Published in : 10.18429/JACoW-IPAC2017-MOPAB113
Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.MOPAB113
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9.
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10.
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Processing High-Bandwidth Bunch-by-Bunch Observation Data from the RF and Transverse Damper Systems of the LHC
/ Ojeda Sandonís, Miguel (CERN) ; Baudrenghien, Philippe (CERN) ; Butterworth, Andrew (CERN) ; Galindo, Javier (CERN) ; Höfle, Wolfgang (CERN) ; Levens, Thomas (CERN) ; Molendijk, John (CERN) ; Vaga, Federico (Pavia U.) ; Valuch, Daniel (CERN)
The radiofrequency and transverse damper feedback systems of the Large Hadron Collider digitize beam phase and position measurements at the bunch repetition rate of 40 MHz. Embedded memory buffers allow a few milliseconds of full rate bunch-by-bunch data to be retrieved over the VME bus for diagnostic purposes, but experience during LHC Run I has shown that for beam studies much longer data records are desirable. [...]
2015 - 4 p.
- Published in : 10.18429/JACoW-ICALEPCS2015-WEPGF062
Fulltext: PDF; External link: JACoW
In : 15th International Conference on Accelerator and Large Experimental Physics Control Systems, Melbourne, Australia, 17 - 23 Oct 2015, pp.WEPGF062
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