A5038647974- Fusion materials and technologies
- Nuclear Materials and Properties
- Magnetic confinement fusion research
- Quantum, superfluid, helium dynamics
- Particle accelerators and beam dynamics
- Nuclear reactor physics and engineering
- Superconducting Materials and Applications
- Copper Interconnects and Reliability
- Advanced ceramic materials synthesis
- nanoparticles nucleation surface interactions
- Electromagnetic Compatibility and Measurements
- Spacecraft and Cryogenic Technologies
Oak Ridge National Laboratory
2022
Massachusetts Institute of Technology
2014-2017
Abstract The SPARC tokamak project, currently in engineering design, aims to achieve breakeven and burning plasma conditions a compact device, thanks new developments high-temperature superconductor technology. With magnetic field of 12.2 T on axis 8.7 MA current, is predicted produce 140 MW fusion power with gain Q ≈ 11, providing ample margin respect its mission > 2. All systems are being designed this landmark discharge, thus enabling the study physics operations reactor relevant pave...
Helium bubbles in metals spontaneously form networks of interconnected channels.
We describe a transmission electron microscopy investigation of the distribution helium precipitates within plane an interface between Cu and V. Statistical analysis precipitate locations reveals weak tendency for interfacial to align along ⟨110⟩-type crystallographic directions layer. Comparison these findings with helium-free Cu/V interfaces suggests that may be aggregating preferentially atomic-size steps in created by threading dislocations Our observations also suggest some...
Tailoring interface structure to control properties promises improve performance in a wide range of structural materials. We demonstrate an approach for designing interfaces with pre-specified internal and functionality using O-lattice theory. To illustrate our method, we design intended mitigate helium (He)-induced damage by promoting precipitation He into continuous linear channels. A similar top-down process may be used tailor other applications such as improved mechanical properties.
We develop a phase field simulation to model morphology evolution of helium (He) precipitates on solid-state interfaces. Our approach accounts for differences in precipitate contact angles arising from location-dependent interface energies and is capable describing growth, coalescence, de-wetting the interface. demonstrate our interfaces with linear chains wettable patches find that different wetting patch spacings give rise four distinct classes morphologies. method may be adapted other...