CERN Accelerating science

Accelerator Physics

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Corrections of high-order nonlinearities in the LHC and High-Luminosity LHC beam optics / Dilly, Joschua Werner (CERN)
The impact of high-order nonlinear magnetic field errors on the performance of the Large Hadron Collider (LHC) and its planned High-Luminosity upgrade, the HL-LHC, has been extensively studied. Particularly, the presence of such errors in the Insertion Regions (IR) has shown significant repercussions due to the high beta-functions and feed-down to lower orders caused by crossing schemes. [...]
CERN-THESIS-2023-382; DOI:10.18452/28273.- Berlin : Humboldt-Universität zu Berlin, 2024-03-01 - 233 p. Fulltext: PDF; External link: Approve this document (restricted)

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Octupole threshold with trains of bunches (MD 9403) / Buffat, Xavier (CERN) ; Giacomel, Lorenzo (CERN) ; Rumolo, Giovanni (CERN) ; Mether, Lotta (CERN) ; Mounet, Nicolas (CERN) ; Paraschou, Konstantinos (CERN)
We describe an experiment aiming at determining the stability threshold in terms of octupole current for bunch trains at flat top in the LHC. [...]
- 2024.
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FCC-ee Machine Detector Interface Alignment System Concepts / Watrelot, Leonard
This thesis is in the framework of the lepton collider part of the Future Circular Collider project, aiming to be the next flagship project at CERN after the High Luminosity upgrade of the Large Hadron Collider, in 2040. The study focuses on the alignment, and monitoring of the alignment, of some accelerator components located inside the physics detector, close to the collision point. [...]
CERN-THESIS-2023-376.- 205 p. Fulltext: PDF; External link: Approve this document (restricted)

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Interpretation of the horizontal beam response near the third integer resonance / Cortés García, E.C. (DESY ; Darmstadt, GSI) ; Niedermayer, P. (Darmstadt, GSI) ; Singh, R. (Darmstadt, GSI) ; Taylor, R. (CERN ; Imperial Coll., London) ; Feldmeier, E. (Heidelberg U.) ; Hun, M. (Heidelberg U.) ; Benedetto, E. (Unlisted, CH) ; Haberer, T. (Heidelberg U.)
The beam response to an external periodic excitation delivers relevant information about the optics, tune distribution and stability of a circulating beam in a storage ring. [...]

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Radiation Testing of Optical and Semiconductor Components for Radiation-Tolerant LED Luminaires / Floriduz, Alessandro (CERN) ; Devine, James D. (CERN)
An irradiation campaign was conducted to provide guidance in the selection of materials and components for the radiation hardening of LED lights for use in CERN accelerator tunnels. [...]
- 8 p.

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Project of the PS beam for ν oscillations : Experiments: Layout and optics / Dumollard, D ; Lazeyras, P ; Simon, D J
CERN-PS-MU-EP-Note-81-6; PS-MU-EP-Note-81-6.- Geneva : CERN, 1981 - 16 p. Fulltext: PDF;

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Design and Manufacturing of an HTS Helical Undulator Demonstrator for Compact FELs / Richter, S C (CERN ; KIT, Karlsruhe) ; Ballarino, A (CERN) ; Bernhard, A (KIT, Karlsruhe) ; Müller, A S (KIT, Karlsruhe)
Among all superconducting undulator geometries, a helical undulator provides a very compact geometry and further is more effective in producing synchrotron radiation, providing circularly polarized photons, which are widely usable for synchrotron radiation users. These characteristics make it a very attractive option for realizing more compact free-electron lasers, requiring a combination of short-period and high-field undulators to produce coherent light up to X-rays. [...]
2024 - 7 p. - Published in : IEEE Trans. Appl. Supercond. 34 (2024) 4101507 Fulltext: PDF;

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Possible installation of a third "splitter magnet" in the LEAR experimental area: Studies of layout and optics / Dumollard, D ; Rensfelt, K G ; Simon, D J
CERN-PS-MU-BL-Note-84-7; PS-MU-BL-Note-84-7.- Geneva : CERN, 1984 - 11 p. Fulltext: PDF;

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Curved-Canted-Cosine-Theta (CCCT) Dipole Prototype Development at CERN / Haziot, Ariel (CERN) ; Kirby, Glyn (CERN) ; Dallocchio, Alessandro (CERN) ; Devred, Arnaud (CERN) ; Foussat, Arnaud (CERN) ; Gentini, Luca (CERN) ; Mangiarotti, Franco J (CERN) ; Pentella, Mariano (CERN) ; Petrone, Carlo (CERN) ; Pincot, Francois-Olivier (CERN) et al.
Due to its flexibility in generating advanced field harmonic corrections and potential for low cost compared to traditional designs, the Canted Cosine Theta (CCT) configuration is particularly interesting for compact particle accelerators and gantries for medical applications. This article presents the design of a curved demonstrator named Fusillo, a Canted Cosine Theta Nb-Ti dipole magnet that is being developed at CERN, featuring a large aperture of 236 mm, a small bending radius of 1 m, a bending angle of 90$^{\circ }$, and multi-harmonic field correction, with a 3.61 T conductor peak field. [...]
2024 - 8 p. - Published in : IEEE Trans. Appl. Supercond. 34 (2024) 4002608 Fulltext: PDF;

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Study on the Thermal Contraction Behavior of State-of-the-Art Nb$_3$Sn Superconducting Magnet Coils in the Longitudinal, Azimuthal, and Radial Direction / Höll, Stefan (CERN) ; Guinchard, Michael (CERN) ; Izquierdo Bermudez, Susana (CERN) ; Frutos, Óscar Sacristán De (CERN)
To meet the requirements of the HL-LHC upgrade in terms of stronger magnetic fields, the new focusing MQXF quadrupoles make use of the enhanced superconducting properties of  Nb$_3$Sn compared to its predecessor NbTi. However, the change in material leads to an increased brittleness and strain sensitivity of the magnet coils, which raises the importance of an adequate mechanical design to guarantee the performance of the magnet. [...]
2024 - 6 p. - Published in : IEEE Trans. Appl. Supercond. 34 (2024) 4003006

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