RADSUM - Topical Workshop on RADiation effects in SUperconducting Magnets

Session

Modelling of radiation effects in superconductors

16 Jan 2025, 08:30

30/7-018 - Kjell Johnsen Auditorium (CERN)

Conveners

Modelling of radiation effects in superconductors

• Daniele Torsello

Modelling of radiation effects in superconductors

• Daniele Torsello

20. Radiation effects on HTS: improved pinning vs. pair breaking

Michael Eisterer

16/01/2025, 08:30

Oral contribution

The first part of the talk will summarize the physics behind the changes of the superconducting properties upon radiation. The introduced defects enhance flux pinning and scattering of the charge carriers. The implications of these two effects on metallic and high-temperature superconductors will be compared. While the change in pinning is currently difficult to predict, the influence of the...

8. Pinning regimes and modeling of flux trapping relevant to HTS in the radiation environment of fusion reactors

Roland Willa (HES-SO Valais/Wallis)

16/01/2025, 08:55

Oral contribution

It is crucial to immobilize magnetic vortices threading the superconductors. Capturing vortex pinning from microscopic interactions with defects poses a very difficult yet insightful task. The theory of strong vortex pinning provides the necessary starting point. We revisit the different regimes of strong-pinning theory and investigate them using large-scale numerical solutions of the...

24. Molecular dynamics simulations of radiation-induced defects

Davide Gambino (Linköping University)

16/01/2025, 09:20

Oral contribution

The superconducting properties of rare-earth barium cuprates (REBCOs) are extremely sensitive to the presence of crystal defects. Irradiation of REBCOs with energetic particles produces a plethora of defects, difficult to characterize thoroughly with experimental investigations alone, in particular at the expected working conditions. Atomistic simulations can assist in the understanding of the...

35. Density functional theory modelling of the defect structures in irradiated REBCO coated conductors

Rebecca Nicholls (University of Oxford)

16/01/2025, 09:45

Oral contribution

Understanding irradiation damage in high-temperature superconductors is important as new compact fusion reactors rely on these materials to generate the high magnetic fields needed to confine the plasma. The superconductor of choice is (RE)Ba2Cu3O7-δ (RE = rare earth element), REBCO. We have used high-energy-resolution X-ray absorption spectroscopy (XAS) to probe the local environment around...

33. First-principles study of defect formation and diffusion in YBa2Cu3O7

Li Yang (University of Tennessee, Knoxville, TN, USA)

16/01/2025, 10:10

Oral contribution

High temperature superconducting (HTS) materials, such as YBa2Cu3O7-δ, will be exposed to high energy neutrons that may impact the superconducting properties and ultimately lead to degradation of the magnetic field strength. Density functional theory (DFT) calculations have been used to investigate the energetics of point defects in YBa2Cu3O7. The formation energies of point defects indicate...

17. Threshold Displacement Energies of Oxygen in YBa2Cu3O7: A Multi-Physics Analysis

Mr Ashley Dickson (Lancaster University)

16/01/2025, 11:00

Oral contribution

High-temperature superconductors (HTS) are promising materials for next-generation fusion reactors and particle accelerators, owing to their remarkable field strengths at elevated temperatures. In these environments, radiation will impinge on the HTS, causing damage. Assessing the extent and nature of this damage is essential for determining the material's lifespan and any necessary shielding...

37. Present state-of-the-art dpa models

Fredric Granberg (University of Helsinki)

16/01/2025, 11:25

Oral contribution

Atomic collision processes are fundamental to numerous advanced materials technologies, such as electron microscopy, semiconductor processing and nuclear power generation. Understanding the atomistic scale phenomena happening during the primary damage production has been a research topic for many decades, both computationally and experimentally. The standard measurement of quantifying the...

30. Displacement damage modelling in the FLUKA Monte Carlo code

Francesc Salvat Pujol (CERN)

16/01/2025, 11:50

Oral contribution

FLUKA is a general-purpose code for the Monte Carlo simulation of coupled hadronic and electromagnetic radiation showers in complex aterial geometries, accounting for the transport, interaction, and decay (where applicable) of over 60 particle species (photons, leptons, hadrons, and ions) at energies up to the PeV and down to the keV (down to 0.01 eV for neutrons). A wide range of...

13. DPA modeling in the PHITS code

Yosuke Iwamoto

16/01/2025, 12:15

Oral contribution

To predict the operating lifetime of materials in radiation environments, the displacement per atom(dpa) value, which is the average number of displaced atoms per atom of a material based on the Norgett-Robinson-Torrens (NRT) model, is widely used as an exposure unit and is defined by elastic energy transfer to Primary Knock on Atoms (PKAs), as well as high-energy effects (e.g., nuclear...