A5023518942- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Magnetic confinement fusion research
- Physics of Superconductivity and Magnetism
- Electromagnetic Simulation and Numerical Methods
- Numerical methods for differential equations
- Thermal Analysis in Power Transmission
- Acoustic Wave Phenomena Research
- Iterative Learning Control Systems
- Advanced Measurement and Metrology Techniques
- Particle Detector Development and Performance
- Microwave Engineering and Waveguides
- Nuclear Physics and Applications
- Heat Transfer Mechanisms
- Particle physics theoretical and experimental studies
- Silicon Carbide Semiconductor Technologies
- Stability and Control of Uncertain Systems
- High voltage insulation and dielectric phenomena
- Advanced Numerical Methods in Computational Mathematics
- Fault Detection and Control Systems
- Antenna Design and Optimization
- Control Systems and Identification
- Magnetic Properties and Applications
European Organization for Nuclear Research
2016-2023
Technical University of Darmstadt
2019-2021
Simulating the transient effects occurring in superconducting accelerator magnet circuits requires including mutual electro-thermo-dynamic interaction among circuit elements, such as power converters, magnets, and protection systems. Nevertheless, numerical analysis is traditionally done separately for each element circuit, leading to possible non-consistent results. We present STEAM, a hierarchical co-simulation framework featuring waveform relaxation method. The simulates complex system...
In this paper, we propose an optimized field/circuit coupling approach for the simulation of magnetothermal transients in superconducting magnets. The improves convergence iterative scheme between a partial differential model and electrical lumped-element circuit. Such multi-physics, multi-rate multi-scale problem requires consistent formulation dedicated framework to tackle challenging transient effects occurring at both circuit magnet level during normal operation case faults. We derive...
Superconducting accelerator magnets require sophisticated monitoring and means of protection due to the large energy stored in magnetic field. Numerical simulations play a crucial role understanding transient phenomena occurring within magnet, can, therefore, help prevent disruptive consequences. We present 2-D FEM model for simulation electro-thermal transients superconducting magnets. The magnetoquasistatic problem is solved with modified vector potential formulation, where cable eddy...
The Nb3Sn block coil dipole magnet FRESCA2 was developed within the framework of a collaboration between CEA Saclay and CERN, in continuity European project EuCARD EuCARD2. With an aperture 100 mm target bore field 13 T at 10.6 kA, is required for new cable test facility CERN. In 2017, pre-loaded to retain forces while powered achieve 13.3 bore. Results these tests were published. 2018, loading has been increased powering higher current. this paper, updated results cold are discussed terms...
Screening currents are field-induced dynamic phenomena which occur in superconducting materials, leading to persistent magnetization. Such of importance ReBCO tapes, where the large size filaments gives rise strong magnetization phenomena. In consequence, accelerator magnets based on tapes might experience a relevant degradation magnetic field quality magnet aperture, eventually particle beam instabilities. Thus, need be accurately evaluated. this paper, 2D finite element model...
In this paper we present an algorithm for the coupling of magneto-thermal and mechanical finite element models representing superconducting accelerator magnets. The are used during design structure as well optimization magnetic field quality under nominal conditions. allow analysis transient phenomena occurring quench initiation, propagation, protection. Mechanical quenching magnets is high importance considering new protection systems study superconductor types. We use field/circuit to...
Transient effects occurring in a superconducting accelerator circuit can be correctly simulated only if the models consistently account for electrothermodynamic coupling between magnets, protection systems, and remaining network. We present framework based on idea of cosimulation. The core component is interface exchanging information independent models. Within framework, we simulate selected parts magnet electrical network, combining appropriately different commercial tools. This modularity...
The application of high-temperature superconductors to accelerator magnets for future particle colliders is under study. Numerical methods are crucial an accurate evaluation the complex dynamical behavior magnets, especially concerning magnetic field quality and thermal behavior. We present a coupled A-H formulation analysis magneto-thermal transients in magnets. strength H accounts eddy current problem source regions containing superconducting domains, while vector potential A represents...
Dynamic simulation of superconducting magnets is critical for the design quench protection systems to prevent potentially damaging temperatures and high voltage from developing after magnet quench.Modeling these scenarios challenging due many multiscale phenomena which impact behavior.These range conductor scale effects interfilament coupling currents up behavior in its powering circuit.In addition, a strong between electromagnetic thermal domains required capture temperature field dependent...
Quench heaters are an essential part of the protection all high-current large hadron collider (LHC) superconducting circuits. About 2000 dipole and quadrupole magnets equipped with quench in order to protect them against development excessive voltage overheating after a resistive transition. The made stainless steel foil partially plated copper connected 900 V capacitor bank discharge power supplies. During Hardware Commissioning campaigns machine operation every heater event is carefully...
Part of the Future Circular Collider (FCC-hh) study is dedicated to development 16 Tesla Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn superconducting dipole magnets. The design magnets was enabled by a cooperative effort national research institutes, universities, and CERN. These actors tackled problem from different sides, namely, electromagnetic design, mechanical quench protection systems, circuit design. article deals with...
In this paper we present the co-simulation of a PID class power converter controller and an electrical circuit by means waveform relaxation technique. The simulation model is characterized fixed-time stepping scheme reflecting its digital implementation, whereas usually employs adaptive time in order to account for wide range constants within model. maintain characteristic both models as well facilitate replacement, treat them separately input/output relations propose application algorithm....
In recent years, the superconducting Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn cable material became privileged mature candidate for high-field magnets in new projects like high-luminosity LHC (HL-LHC) accelerator at CERN, Geneva, Switzerland. The technology 2017-2021 needs to be deployed through an unprecedented magnet series production with dedicated online quality control. key fabrication stage of vacuum pressure...
The quadrupole magnets for the Large Hadron Collider (LHC) upgrade to higher luminosity are jointly developed by CERN and US-LARP (LHC Accelerator Research Program). These Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn will be protected against overheating after a quench combination of heaters bonded coil outer surface coupling-loss induced (CLIQ) units. first 4-m-long prototype magnet, called MQXFAP1, was tested at Brookhaven...
The Future Circular Collider (FCC-hh) project is a conceptual study whose goal to design the successor of Large Hadron Collider, increasing collision energy from 14 100 TeV.The stored in 16-T superconducting dipole magnets and length sectors composing 100-km FCC tunnel are considerably larger than those present accelerators.This means that FCC-hh circuit likely be much higher existing circuits.In case magnet quenches or faults, needs protected, i.e., its rapidly dissipated without inducing...
An energy of 362 MJ is stored in each the two LHC proton beams for nominal beam parameters. This will be further increased to about 700 future high luminosity (HL-LHC) and uncontrolled losses represent a significant hazard integrity safe operation machine. In this paper, number failure mechanisms that can lead fast increase are analyzed. Most critical failures magnet protection system, namely quench heaters novel system called coupling-loss induced (CLIQ). important outcome has evaluated its...
In this work, we present and analyze the numerical stability of two coupled finite element formulations. The first one is h-a-formulation well suited for modeling systems with superconductors ferromagnetic materials. second one, so-called t-a-formulation thin-shell approximation, applies thin superconducting domains. Both formulations involve unknown fields are mixed on coupling interfaces. Function spaces in must satisfy compatibility conditions to ensure problem reliability solution. We...
Accelerators magnets must have minimal magnetic field imperfections for reducing particle-beam instabilities. In the case of coils made high-temperature superconducting (HTS) tapes, from persistent currents need to be carefully evaluated. this paper we study use screens based on HTS tapes in accelerator magnets. The exploit magnetization by cancel out error. are aligned with main components, such that only undesired components compensated. passive, self-regulating, and do not require any...
Abstract Small orbit oscillations of the circulating particle beams have been observed immediately following quenches in LHC’s superconducting main dipole magnets. Magnetic fields generated during discharge into quench heaters were identified as cause. Since resulting, shielded field inside beam screen cannot be measured in-situ, time evolution has to reconstructed from excursions. In this paper, field-reconstruction method using rotation normalized phase space and optimized fitting...