CERN Accelerating science

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Magnetization in superconducting corrector magnets and impact on luminosity-calibration scans in the Large Hadron Collider / Chmielinska, Agnieszka (CERN) ; Fiscarelli, Lucio (CERN) ; Todesco, Ezio (CERN) ; Hostettler, Michi (CERN) ; Russenschuck, Stephan (CERN) ; Kozanecki, Witold (Université Paris-Saclay (FR))
Superconducting accelerator magnets have a nonlinear dependence of field on current due to the magnetization associated to the iron or to persistent currents in the superconducting filaments. This also gives rise to hysteresis phenomena that create a dependence of the field on the powering history. [...]
arXiv:2304.06559; CERN-TE-2023-001.- Geneva : CERN, 2023-09-10 - 17 p. - Published in : Eur. Phys. J. Plus 138 (2023) 796 Fulltext: 2304.06559 - PDF; document - PDF; CERN-TE-2023-001 - PDF;

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Anomaly Detection in Conditioning Procedures / Hofmann-Wellenhof, Martin (Graz University of Technology) ; Obermair, Christoph (Graz University of Technology (AT))
In this report, we summarize our approach to find anomalies in conditioning procedures with an LSTM autoencoder. [...]
- 2022. - 22 p.

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Thermomechanical Characterization of Epoxy Composites Used in High Field Magnet Coils / Wiker, Petter (Norwegian U. Sci. Tech.)
In the framework of the High-Luminosity Large Hadron Collider project and the planned Future Circular Collider, prototype magnet coils based on Nb3Sn superconductors are under development at CERN. [...]
- 2021. - 59 p.

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Nine years of carbon coating development for the SPS upgrade: achievements and heritage. / Taborelli, Mauro (CERN) ; Chiggiato, Paolo (CERN) ; Costa Pinto, Pedro (CERN) ; Cruikshank, Paul (CERN)
CERN has succeeded in producing carbon coatings that eradicate electron cloud in accelerators without any beam conditioning or in situ heating. [...]
- 2015. - 20 p.

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Frequency-Domain Maximum-Likelihood Estimation of High-Voltage Pulse Transformer Model Parameters / Aguglia, D (CERN ; Laval U., Quebec) ; Viarouge, P. ; Martins, C.D.A.
This paper presents an offline frequency-domain nonlinear and stochastic identification method for equivalent model parameter estimation of high-voltage pulse transformers. Such kinds of transformers are widely used in the pulsed-power domain, and the difficulty in deriving pulsed-power converter optimal control strategies is directly linked to the accuracy of the equivalent circuit parameters. [...]
CERN-OPEN-2014-053.- Geneva : CERN, 2014 - 10 p. - Published in : IEEE Trans. Indust. Appl. 49 (2013) 2552-2561 Article: PDF;

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Interconnected High-Voltage Pulsed-Power Converters System Design for H− Ion Sources / Aguglia, D (CERN)
This paper presents the design and experimental validations of a system of three new high-voltage (HV) pulsedpower converters for the H− sources. The system requires three pulsed voltages (50, 40, and 25 kV to ground) at 2-Hz repetition rate, for 700 μs of usable flat-top. [...]
CERN-OPEN-2014-052.- Geneva : CERN, 2014 - 7 p. - Published in : IEEE Trans. Plasma Sci. 42 (2014) 3070-3076 Article: PDF;

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Proof of the nonexistence of a linear solution for the CR2 injection region of the CLIC drive beam / Apsimon, Robert (CERN) ; Esberg, Jakob (CERN)
In this paper we present a mathematical proof to show that there exists no linear system of optics which can simultaneously close an orbit bump and correct the dispersion in the CR2 injection region. [...]
CERN-OPEN-2014-045 ; CLIC-Note-1035.
- 2014. - 13 p.

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Design of the Injection and extraction system and related machine protection for the Clic Damping Rings / Apsimon, Robert (CERN) ; Balhan, Bruno (CERN) ; Barnes, Mike (CERN) ; Borburgh, Jan (CERN) ; Goddard, Brennan (CERN) ; Papaphilippou, Yannis (CERN) ; Uythoven, Jan (CERN)
Linear machines such as CLIC have relatively low rates of collision between bunches compared to their circular counterparts. [...]
CERN-OPEN-2014-044 ; CLIC-Note-1034.
- 2014. - 20 p.

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Proposed Feed Forward Correction for the CLIC Ring-To-Main-Linac Transfer Lines / Apsimon, Robert (CERN) ; Latina, Andrea (CERN) ; Uythoven, Jan (CERN)
To achieve the design luminosity for the CLIC main beam an unprecedented degree of machine stability is required. [...]
CERN-OPEN-2014-034 ; CLIC-Note-1027.
- 2014. - 25 p.

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Sensitivity Analysis for the CLIC Damping Ring Inductive Adder / Holma, Janne (CERN) ; Barnes, Michael (CERN)
The CLIC study is exploring the scheme for an electron-positron collider with high luminosity and a nominal centre-of-mass energy of 3 TeV. [...]
CERN-OPEN-2013-041 ; CLIC-Note-1021.
- 2012. - 5 p.

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