515664 research outputs found
Sort by
Constraints on Higgs Couplings to Second Generation Fermions from ATLAS
No full textAn important approach to fully understanding the mechanism of fermion mass is the coupling of the Higgs boson to second-generation quarks. Among the searches for these types of coupling, the Higgs boson decay to charm quarks and muon leptons are the most promising mode to investigate. This talk will focus on the latest results of the Higgs boson to charm and muon decay analyses from the ATLAS collaboration. Tthe techniques used to identify charm objects will also be presented
Development of the Level-0 endcap muon trigger firmware for the ATLAS experiment at HL-LHC
No full textContents: The design and status are reported for the development of the Level-0 endcap muon trigger firmware of the ATLAS experiment at HL-LHC. An ATCA blade with an XCVU13P FPGA has been developed, and the firmware uses detector hits from the Thin Gap Chambers (TGC) and processed data from other detectors to reconstruct muon candidates. An algorithm that minimises the use of XCVU13P FPGA resources is a major challenge. Performance was evaluated in post-synthesis simulations
Magnetic design of downstream scanning magnets for a novel hadrontherapy gantry
No full textHadrontherapy utilizes accelerated ion beams to deliver precise and effective cancer treatments, depositing energy at specific depths while sparing healthy tissues. Gantries are large rotating structures that direct beams at various angles around the patient, improving dose conformity to tumors and the robustness of the treatment plan while minimizing radiation exposure to surrounding organs. While proton gantries are widespread and commercially available, the diffusion of carbon ion gantries is limited due to more demanding technological challenges and financial investments. This paper presents the magnetic design of the scanning magnets for the EuroSIG (European Superconducting Ion Gantry) project, aimed at developing a novel superconducting gantry for hadrontherapy. The chosen layout foresees the positioning of the scanning magnets downstream of the last bending section. This simplifies the production of the superconducting dipole but increases the complexity of the scanning system in terms of integrated fields, bending angles, and ramp rates. To address this challenge, analytical models and optimization tools were employed to achieve balanced configurations for the scanning magnets, improving compatibility with power converters. Three-dimensional numerical simulations were implemented to evaluate and improve the steady-state field quality of horizontal and vertical scanning magnets. Particle tracking was used to validate the effective beam deflection in both magnets and assess beam position errors at the isocenter. Furthermore, quasistatic simulations were carried out to evaluate integral field errors due to the hysteretic behavior of the yoke alloy. Continuing the analysis of dynamic phenomena, the generation of eddy currents in the laminated yoke was investigated, highlighting the delay of the generated field with respect to the imposed current profile. The studies reported in this manuscript confirmed the design’s feasibility, posing a solid base for the construction of the first scanning magnet prototype
Evaluation of SmartNIC Devices for Use in Trigger and Data Acquisition Systems
No full textThis article presents an evaluation of SmartNIC devices in the context of Trigger and Data AcQuisition (TDAQ) systems. SmartNIC devices represent an emerging technology whose aim is to offload network tasks and infrastructure control plane software from the CPU. Such devices are particularly relevant for TDAQ systems where high rates in the orders of TB/s are produced in large detectors such as the deep underground neutrino experiment (DUNE). In this context, the potential use case of SmartNICs is to perform a quasi-real-time reduction of the incoming data streams by identifying only the interesting signals. The goal is to sustain a number of ~10 Gb data streams aggregated on 100 Gb interfaces and transmit the results to the host machine. An application was developed to provide a testing environment, measuring the achieved throughput in two cases. In the first case, only the total throughput is considered, and the workload is evenly distributed across the available hardware. In the second case, a constraint of processing a number of discrete data streams is added. The application was shown to handle up to ~130 Gbps of incoming data when distributing the workload evenly on the available hardware resources of 8 CPU cores. In this contribution, we show the testing results, optimizations, and hardware tuning of the technology when performing a workload suitable for TDAQ applications
Studies of F- impurities formation in ALICE MID RPC detectors: A comparison between LHC RUN2 and LHC RUN3
No full textThe ALICE Muon Identifier (MID) system consists of 72 single-gap Resistive Plate Chamber (RPC) detectors, operated with a gas mixture of C2H2F4, iC4H10, and SF6 at a ratio of 89.7%/10%/0.3%, along with 37% of relative humidity. The combined effects of background irradiation and the electric field within the detector’s gas gap, together with the high concentration of fluorinated gases used, result in the production of F− ions and F-based impurities. During LHC RUN2, a preliminary setup was installed to monitor the formation of these impurities, which could lead to the formation of hydrofluoric acid, damaging the detectors and the gas system irreparably (Abbrescia et al. 2008). This setup successfully demonstrated the production of F− and other impurities, and the purifier’s capability to trap them, ensuring the feasibility of operating the gas system in recirculation mode. During LHC LS2, the set up was improved and was commissioned for the restart of LHC RUN3. It consists of a gas chromatograph to monitor the correct composition of the gas mixture and an Ion Selective Electrode setup to measure the F− concentration. This study provides a comprehensive overview of the creation of impurities in the ALICE MID RPC detectors under standard operation. Furthermore, it presents a comparative analysis between the results obtained during LHC RUN2 and those ongoing in LHC RUN3
10th International Conference on Charged & Neutral Particles Channeling Phenomena (Channeling 2024)
No full text
Visite de Madame Simone de Montmollin, Présidente de la Commission de la science, de l’éducation et de la culture, Confédération suisse
No full textVisite de Madame Simone de Montmollin, Présidente de la Commission de la science, de l’éducation et de la culture accompagnée des membres de la Commission et des services du Parlement, Confédération suiss