2025-02-21
14:58 |
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2025-02-21
09:09 |
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2025-02-20
09:01 |
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2025-02-19
15:15 |
LHC Effective Model for Optics Corrections
This thesis investigates the crucial role of higher-order magnetic fields and non-linear optics in the stability and performance of particle accelerators, focusing on the Large Hadron Collider (LHC) at CERN [...]
CERN-THESIS-2024-336
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250.
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2025-02-18
06:49 |
e-book
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2025-02-18
06:48 |
Transforming Concept into Reality: Overcoming Challenges in the HL-LHC IT String Test Stand Implementation
/ Bajko, M (CERN) ; Blanchard, S (CERN) ; Bozzini, D (CERN) ; Bruning, O (CERN) ; Garcia, N Heredia (CERN) ; Zerlauth, M (CERN) ; Yammine, S (CERN)
The objective of the High-Luminosity Large Hadron Collider (HL-LHC) Inner Triplet (IT) String is to faithfully represent and validate, within a surface building at CERN, the installation and collective behavior of all major systems in the new HL-LHC IT zone. These systems encompass superconducting magnets, protection, cryogenics for the superconducting magnets and the superconducting link, powering, vacuum, alignment, interconnections between magnets, and the superconducting link itself. [...]
2025 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 35 (2025) 1-5
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2025-02-18
06:48 |
Radiological Zoning and Clearance Methodology of activated cables in the LHC accelerator at CERN
/ Dyrcz, Patrycja (CERN) ; Infantino, Angelo (CERN) ; Menaa, Nabil (CERN) ; El-Idrissi, Safouane (CERN) ; Vincke, Heinz (CERN)
In the context of upgrading the Large Hadron Collider (LHC) to its High-Luminosity (HL-LHC) configuration,
it is essential to conduct a thorough zoning classification and characterization of activated cables within the
particle accelerator. To address this need, a methodology was developed to identify regions where materials
can be cleared from regulatory control in compliance with the Swiss Radiation Protection Legislation.
The study begins with optimizing the elemental composition of cables and validating Monte Carlo
FLUKA simulations using high-energy resolution gamma spectrometry (GS) and total gamma counting (TGC)
measurements on 19 copper cable samples, collected during the winter shutdown 2023/2024.
This methodology enables performing radiological zoning and accurately defines the radiological classification of the cables installed in the LHC Points 1 and 5, including both the accelerator tunnel and service
galleries, prior to dismantling.
Finally, the study proposes a conservative scaling factor for cable zoning and introduces a TGC figure of
merit (FOM), representing a conservative activation scenario for the copper cable types..
2025 - 11 p.
- Published in : Appl. Radiat. Isot. 218 (2025) 111692
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2025-02-07
17:47 |
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2025-02-04
06:47 |
Construction and Analysis of a Modified Nb3Sn 11 T Short Dipole Model
/ Cabrera, Carmen Abad (CERN) ; Perini, Diego (CERN) ; Bampton, Tavis Alexander (CERN) ; Bahmane, Oussama Id (CERN) ; Izquierdo Bermudez, Susana (CERN) ; Bourcey, Nicolas (CERN) ; Devred, Arnaud (CERN) ; Vez, Ruth Diaz (CERN) ; Garion, Cedric (CERN) ; Guinchard, Michael (CERN) et al.
The 5.2-m-long, 11 T double-aperture Nb3Sn Dipole
Magnet was designed to replace some of the standard, 15-m-long
8.3 T Nb–Ti main dipole magnets in the Large Hadron Collider.
After the production and test of several of 2-m-long models, the
test of full-length 11 T series magnets revealed signs of performance
degradation in the coil ends after a sequence of electromagnetic and
thermal cycles. The possible sources for performance degradation
were categorized into two groups: issues internal to the coils and
issues with the coil support structure, in particular in the magnet
ends. [...]
2025 - 7 p.
- Published in : IEEE Trans. Appl. Supercond. 35 (2025) 1-7
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2025-02-04
06:47 |
Performance of a HL-LHC Nb$_3$Sn Quadrupole Magnet in the 100–200 MPa Range of Azimuthal Stress
/ Mangiarotti, F J (CERN) ; Izquierdo Bermudez, S (CERN) ; Devred, A (CERN) ; Diaz Vez, R (CERN) ; Ferradas Troitino, J (CERN) ; Ferradas Troitino, S (CERN) ; Feuvrier, J (CERN) ; Guinchard, M (CERN) ; Haziot, A (CERN) ; Milanese, A (CERN) et al.
With the assembly and test results of four Nb$_\text{3}$Sn short-model quadrupoles (MQXFS) for the High Luminosity Upgrade of the CERN Large Hadron Collider (LHC), an optimum pre-load level was established for the construction of the full-length, series magnets. Successive MQXFS magnets were used as testbeds for potential changes (including pre-load fine tuning) to be implemented in the series, and to better understand the stress dependence of Nb$_\text{3}$Sn magnet performance. [...]
2025 - 7 p.
- Published in : IEEE Trans. Appl. Supercond. 35 (2025) 4000307
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