A5062575253- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Physics of Superconductivity and Magnetism
- Gyrotron and Vacuum Electronics Research
- Particle Accelerators and Free-Electron Lasers
- Magnetic confinement fusion research
- Plasma Diagnostics and Applications
- Laser Design and Applications
- Acoustic Wave Resonator Technologies
- Semiconductor materials and interfaces
- Magnetic and transport properties of perovskites and related materials
- Photocathodes and Microchannel Plates
- Silicon and Solar Cell Technologies
- Superconducting and THz Device Technology
- Energy Harvesting in Wireless Networks
- Atomic and Subatomic Physics Research
- Atomic and Molecular Physics
Helmholtz-Zentrum Berlin für Materialien und Energie
2015-2024
Thomas Jefferson National Accelerator Facility
2023
Institut de Recherche sur les Lois Fondamentales de l'Univers
2023
Université Paris-Saclay
2023
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2023
CEA Paris-Saclay
2023
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
2023
Institut National de Physique Nucléaire et de Physique des Particules
2023
Centre National de la Recherche Scientifique
2023
High Energy Accelerator Research Organization
2023
Nb$_3$Sn is currently the most promising material other than niobium for future superconducting radiofrequency cavities. Critical fields above 120 mT in pulsed operation and about 80 CW have been achieved cavity tests. This large compared to lower critical field as derived from London penetration depth, extracted low surface impedance measurements. In this paper direct measurements of depth which superheating are presented. The first vortex measured under DC RF fields. combined results...
Test cavities to characterize superconductor samples are of great interest for the development materials suitable superconducting radio frequency (SRF) accelerator systems. They can be used investigate fundamental SRF loss mechanisms and study material limitations applications. Worldwide, this research is based on only few systems that differ in operating frequency, sample size shape, accessible parameter space temperature, RF field strength. For useful performance predictions future...
Many modern accelerators rely on superconducting radio-frequency (SRF) cavities to accelerate particles. When these are cooled the state, a fraction of ambient magnetic field (e.g., Earth’s field) may be trapped in superconductor. This flux can significantly increase power dissipation SRF cavities. It is, therefore, crucial understand underlying mechanism how is and what treatments operating conditions reduce flux-trapping efficiency. A new experiment was designed that enables systemic...
The quadrupole resonator (QPR) is a dedicated sample-test cavity for the RF characterization of superconducting samples in wide temperature, field and frequency range. Its main purpose are high resolution measurements surface resistance with direct access to residual thanks low first operating mode. Besides well-known QPR, bias measurement data towards higher values has been observed, especially at harmonic modes. Numerical studies show that this can be explained by parasitic losses on...
The quality factor of an RF cavity and the surface resistance are typically related with a constant geometry factor. implicit assumption made is that field independent, which however not observed experimentally in superconducting cavities. approximation error due to this becomes larger less homogeneous magnetic distribution along walls is. In paper we calculate for different types. An iterative method correct presented.
S-I-S’ multilayers promise to boost the performance of bulk superconductors in terms maximum field and surface resistance. At HZB, RF-surface resistance measurements were performed with a Quadrupole Resonator (QPR) an sample (75 nm NbTiN on 15 AlN insulator Nb) prepared at JLab. Measurements 414, 845, 1286 MHz temperatures from 2 K up well above transition temperature ~17.3 K. The Rs exhibits unexpected dependence: Rather than rising monotonically, as expected BCS theory, local is observed....
This paper is an overview of the metallographic polishing R&D program covering Niobium and Copper substrates treatment for thin film coating as alternative fabrication pathway 1.3 GHz elliptical cavities. The presented research result a collaborative effort between IJCLab, CEA/Irfu, HZB, KEK in order to develop innovative surface processing cavity protocols capable meeting stringent requirements SRF surfaces, including reduction safety risks ecological footprint, enhancing reliability,...
The quadrupole resonator (QPR) is a dedicated sample-test cavity for the RF characterization of superconducting samples in wide temperature, field and frequency range. Its main purpose are high resolution measurements surface resistance with direct access to residual thanks low first operating mode. Besides well-known QPR, bias measurement data towards higher values has been observed, especially at harmonic modes. Numerical studies show that this can be explained by parasitic losses on...