Category: Publications
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Distributed optical strain sensing measurements down to cryogenic temperatures
Rayleigh backscattering (RBS)-based distributed fiber sensors technology is becoming more and more crucial in various fields such as aerospace and defense, automotive, civil, and geotechnical. This technology is measuring the naturally occurring Rayleigh backscatter level in the optical fiber core; thus, any standard single-mode telecom optical fiber can be used. The application of distributed optical…
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The effect of ground motion on the LHC and HL-LHC beam orbit
The High Luminosity Large Hadron Collider (HL-LHC) will require unprecedented orbit stability at the low-beta experiments, ATLAS and CMS. Because the effect of seismic noise might become a relevant source of luminosity loss, several studies have been conducted to characterise the actual ground motion in the LHC tunnel. In preparation for the official groundbreaking of…
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An Experiment to Test Advanced Materials Impacted by Intense Proton Pulses at CERN HiRadMat Facility
Predicting the consequences of highly energetic particle beams impacting protection devices as collimators or high power target stations is a fundamental issue in the design of state-of-the-art facilities for high-energy particle physics. These complex dynamic phenomena can be successfully simulated resorting to highly non-linear numerical tools (Hydrocodes). In order to produce accurate results, however, these…
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Mechanical strain measurements based on Fiber Bragg grating down to cryogenic temperature – R&D study and applications
In recent years, optical fiber sensors have been increasingly used due to their outstanding performances. Their application is preferable in case of special requirements that exclude the application of conventional electrical sensors. The scientific background of optical fiber sensors is well developed. However, the characteristic of sensors employed in rather harsh environments is often different…
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Study on the Thermal Contraction Behavior of State-of-the-Art Nb3Sn Superconducting Magnet Coils in the Longitudinal, Azimuthal, and Radial Direction
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…