A5027824725- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Magnetic confinement fusion research
- Particle Accelerators and Free-Electron Lasers
- Physics of Superconductivity and Magnetism
- Fusion materials and technologies
- Metal and Thin Film Mechanics
- Advanced Surface Polishing Techniques
- Plasma Diagnostics and Applications
- Human-Automation Interaction and Safety
- Advanced Materials Characterization Techniques
ShanghaiTech University
2023-2025
Institut de Recherche sur les Lois Fondamentales de l'Univers
2017-2019
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2017-2019
Université Paris-Saclay
2018-2019
CEA Paris-Saclay
2018-2019
Superconducting radio-frequency niobium cavities processed using buffered chemical polishing (BCP) sometimes show typical W-shaped pits on their surface, which may greatly limit performance. However, the causes of such and effective solutions are not fully understood. In this study, we reproduced formation cavity surface through sample BCP experiments, directly observed surface's evolution during process polished morphology, analyzed cause in detail: attachment bubbles process. Then,...
Buffered chemical polishing (BCP) is an important and widely used technique for superconducting radio-frequency (SRF) cavities made of niobium. A common problem encountered during BCP the formation bubbles W-shaped pits on cavity surface, which may severely limit RF performance. We report a method to address through optimizing acid ratio. systematically investigate effect ratio sample experiments determine optimal three acids. The new recipe with verified development niobium several...
The toroidal field (TF) system of JT-60SA tokamak comprises 18 NbTi superconducting coils. In each TF coil, 6 cable-in-conduit conductor (CICC) lengths are wound into double-pancakes and carry a nominal current 25.7 kA at temperature 4.7 K. Each coil is tested in the cold test facility (CEA Saclay), up to quench. A SuperMagnet (CryoSoft) model has been developed, 12 pancakes being modeled with THEA cryogenic circuit FLOWER. experiments showed that helium inlet increases until quench...
JT-60 SA is a fusion experiment which jointly constructed by Japan and Europe shall contribute to the early realization of energy, providing support operation ITER, addressing key physics issues for ITER DEMO. In order achieve these goals, existing U will be upgraded using superconducting coils. The 18 Toroidal Field Coils (TFC) device are provided European industry tested in Cold Test Facility (CTF) at CEA Saclay. At summer 2017, 14 TFCs have been nominal current 25.7 kA temperature between...
The toroidal field system of the JT-60SA tokamak is composed 18 NbTi superconducting coils. Each TF coil six cable-in-conduit conductor lengths, wound in double-pancakes, and carrying a nominal current 25.7 kA. These coils are being tested single-coil configuration at so-called cold test facility (CEA/IRFU, Saclay, France). program includes for all quench obtained by progressive increase operating temperature helium inlet up to (around 7.5 K). Thanks accuracy voltage measurements, it has...
In the framework of European-Japanese project JT-60SA, quench tests are performed for each 18 NbTi superconducting tokamak toroidal field coils (TFC) in Cold Test Facility at CEA Saclay, Gif-sur-Yvette, France. While launching these experimental tests, conductor current sharing temperature (T <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">cs</sub> ) is reached by progressively increasing inlet helium temperature. The quite complex dynamics then...
The Shanghai HIgh repetitioN rate XFEL and Extreme light facility (SHINE) requires 77 superconducting quadrupole (SCQ) magnets for the installation in Cryomodules of linear accelerators. Each magnet is designed with an integrated field error ΔBL/BL ≤ 5×10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-4</sup> integral gradient up to 3 T within 10 mm-aperture. Correction steering coils are magnet, capable providing greater than Tmm either...
Shanghai HIgh repetitioN rate XFEL and Extreme light facility (SHINE) is a 3 km long advanced X-ray source facility. The main superconducting Linear Accelerator (Linac) of SHINE can increase the electron beam energy up to 8 GeV under (SC) continuous wave (CW) mode. Linac mainly based on seventy-five 1.3 GHz-cavity cryomodules which are connected in series 1.4 operated at superfluid helium temperature 2 K. Each cryomodule consists Superconducting Radio Frequency (SRF) cavities, high power...
In the framework of EU-JA Broader Approach agreement, 20 Toroidal Field (TF) coils (18 for tokamak + 2 spares) produced JT-60SA were qualified in cold conditions and at full current (25.7 kA) self-field heated up until quench occurs, along standardized testing procedures, Cold Test Facility (CTF) installed CEA-IRFU (Saclay, France). The analysis tests results will be presented using simple dynamic models coolant exchange with cable steady-state regime. addition to this approach, operating...
JT-60SA is an advanced superconducting fusion Tokamak jointly constructed by Japan and Europe. It takes the main missions of addressing key physics issues providing direct operation experiences for ITER DEMO reactors. In framework project, 18 NbTi Toroidal Field (TF) coils have been tested in quench conditions at CEA Paris-Saclay. our previous study these tests, a typical behavior has identified analyzed. This shows majority (13 tests over 19), four dynamic phases including initiation phase...