Journal: CERN reports

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2013 - 201912020 - 20221
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Publications 1 - 2 of 2
  • Detection of structured laser beam centroid and its use for alignment
    Item type: Conference Paper
    Dusek, Martin; Polak, Krystof; Gayde, Jean-Christophe; et al. (2022)
    CERN reports ~ 16th International Workshop on Accelerator Alignment (IWAA 2022) - Proceedings
    A Structured Laser Beam (SLB) [1] is a pseudo-non- diffractive optical beam. Its transverse profile is similar to a Bessel Beam (BB), hence its bright central core is sur- rounded by concentric circles. SLB can propagate with very low divergence over long distances. Propagation over 200 m has been tested with a divergence under 0.01 mrad. Therefore, the central core can still fit on the camera chip and its centroid position can be accurately detected, which is not the case for well-known Gaussian beams (GB). These properties make the SLB a promising candidate for long- distance alignment applications because it could be used as a reference line. The alignment accuracy is affected by the algorithms for centroid detection. In this work, different algorithms for centroid position detection are evaluated and com- pared on simulated data, namely the best fitting of a well- parameterized Bessel function and different alternations of the center of gravity methods. In addition to simulations, real data are obtained during experiments using a high- precision motorized stage to induce a known translation of a sensor resulting in misalignment. This misalignment is compared with the misalignment detected by an SLB sensor. Therefore, the potential of SLB for long-distance alignment is explored.
  • Handbook of LHC Higgs cross sections
    Item type: Report
    LHC Higgs Cross Section Working Group; Heinemeyer, S.; Chanon, Nicolas; et al. (2013)
    CERN reports
    This Report summarizes the results of the activities in 2012 and the first half of 2013 of the LHC Higgs Cross Section Working Group. The main goal of the working group was to present the state of the art of Higgs Physics at the LHC, integrating all new results that have appeared in the last few years. This report follows the first working group report Handbook of LHC Higgs Cross Sections: 1. Inclusive Observables (CERN-2011-002) and the second working group report Handbook of LHC Higgs Cross Sections: 2. Differential Distributions (CERN-2012-002). After the discovery of a Higgs boson at the LHC in mid-2012 this report focuses on refined prediction of Standard Model (SM) Higgs phenomenology around the experimentally observed value of 125-126 GeV, refined predictions for heavy SM-like Higgs bosons as well as predictions in the Minimal Supersymmetric Standard Model and first steps to go beyond these models. The other main focus is on the extraction of the characteristics and properties of the newly discovered particle such as couplings to SM particles, spin and CP-quantum numbers etc.
Publications 1 - 2 of 2