A5048330076- Fusion materials and technologies
- Nuclear Materials and Properties
- Magnetic confinement fusion research
- Metal and Thin Film Mechanics
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Ion-surface interactions and analysis
- Plasma Diagnostics and Applications
- Diamond and Carbon-based Materials Research
- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Nuclear reactor physics and engineering
- Advanced materials and composites
- Superconducting Materials and Applications
- Atomic and Molecular Physics
- Particle accelerators and beam dynamics
- Crystallography and molecular interactions
- Advanced Materials Characterization Techniques
- Semiconductor materials and devices
- Muon and positron interactions and applications
- Nuclear materials and radiation effects
- Particle physics theoretical and experimental studies
- Nuclear Physics and Applications
- Electronic and Structural Properties of Oxides
- High-pressure geophysics and materials
University of California, San Diego
2016-2025
Max Planck Institute for Plasma Physics
2020
University of Tulsa
2019
Massachusetts Institute of Technology
2019
University of California System
2017
Japan External Trade Organization
2015
National Institute for Laser Plasma and Radiation Physics
2010-2012
General Atomics (United States)
2006
University of New England
1996-2001
In response to the 2013 Update of European Strategy for Particle Physics, Future Circular Collider (FCC) study was launched, as an international collaboration hosted by CERN. This covers a highest-luminosity high-energy lepton collider (FCC-ee) and energy-frontier hadron (FCC-hh), which could, successively, be installed in same 100 km tunnel. The scientific capabilities integrated FCC programme would serve worldwide community throughout 21st century. also investigates LHC energy upgrade,...
We review the physics opportunities of Future Circular Collider, covering its e+e-, pp, ep and heavy ion programmes. describe measurement capabilities each FCC component, addressing study electroweak, Higgs strong interactions, top quark flavour, as well phenomena beyond Standard Model. highlight synergy complementarity different colliders, which will contribute to a uniquely coherent ambitious research programme, providing an unmatchable combination precision sensitivity new physics.
Polished W discs exposed to pure He plasma in the PISCES-B linear-divertor-plasma simulator at 1120 and 1320 K are found develop deeply nanostructured surface layers consisting of a conglomerate amorphous ‘nanorods’. The growth thickness layer is explored for exposure times spanning 300–(2.2 × 10 4 ) s plasmas density n e ∼ 18 m −3 temperature T 6–8 eV where average He-ion surface-impact energy ∼60 eV, below threshold physical sputtering. A excess 5 µm thick observed longest time explored....
In response to the 2013 Update of European Strategy for Particle Physics (EPPSU), Future Circular Collider (FCC) study was launched as a world-wide international collaboration hosted by CERN. The FCC covered an energy-frontier hadron collider (FCC-hh), highest-luminosity high-energy lepton (FCC-ee), corresponding 100 km tunnel infrastructure, well physics opportunities these two colliders, and LHC, based on FCC-hh technology. This document constitutes third volume Conceptual Design Report,...
In response to the 2013 Update of European Strategy for Particle Physics (EPPSU), Future Circular Collider (FCC) study was launched as a world-wide international collaboration hosted by CERN. The FCC covered an energy-frontier hadron collider (FCC-hh), highest-luminosity high-energy lepton (FCC-ee), corresponding 100 km tunnel infrastructure, well physics opportunities these two colliders, and LHC, based on FCC-hh technology. This document constitutes third volume Conceptual Design Report,...
Blister formation and D retention in W have been investigated for low energy (∼55 ± 15 eV), high flux (∼10 22 m −2 s −1 ), fluence (⩽4.5 × 10 26 ) ion bombardment at moderate temperature (∼573 K) mixed species D+He plasmas the linear divertor plasma simulator PISCES-A. The amount of retained is found to decrease significantly when compared with that exposed pure plasmas, as measured resolution thermal desorption spectroscopy. Scanning electron microscopy observations reveal suppression...
The thickness x, of tungsten fuzz layers are measured for non-varying helium (He) plasma exposure conditions spanning four orders ion fluence (1024–1028m−2) and flux (1019–1023 m−2 s−1), at 1000–1140 K under low energy He impact (50–80) eV. data obtained complemented by previously published similar growth conditions, collectively analysed. new analysis allows the reconciliation fast high with commonly observed slower lower flux. It is demonstrated that standing t1/2 time dependence a special...
Abstract Growth of tungsten nano-tendrils (‘fuzz’) has been observed for the first time in divertor region a high-power density tokamak experiment. After 14 consecutive helium L-mode discharges Alcator C-Mod, tip Langmuir probe at outer strike point was fully covered with layer nano-tendrils. The thickness individual (50–100 nm) and depth (600 ± 150 are consistent observations from experiments on linear plasma devices. observation fuzz may have important implications material erosion, dust...
Abstract Nanotendril “fuzz” will grow under He bombardment tokamak-relevant conditions on tungsten plasma-facing materials in a magnetic fusion energy device. We have grown nanotendrils at low (50 eV) and high (12 keV) energy, the range 900–1000 °C, characterized them using electron microscopy. Low tendrils are finer (~22 nm diameter) than high-energy (~176 diameter), low-energy smoother surface tendrils. Cavities were omnipresent typically ~5–10 size. Oxygen was present tendril surfaces,...
Measurements of deuterium retention in samples lithium exposed the liquid state to plasma are reported. Retention was measured as a function ion dose range 6×1019–4×1022 D atoms and exposure temperature between 523 673 K using thermal desorption spectrometry. The results consistent with full uptake all ions incident on metal surface found be independent over explored. Full uptake, very low recycling, continues until sample is volumetrically converted deuteride. This occurs for temperatures...
Please see the PDF file.
One of the main challenges in developing highly efficient nanostructured photoelectrodes is to achieve good control over desired morphology and electrical conductivity. We present an plasma-processing technique form porous structures tungsten substrates. After optimized two-step annealling procedure, mesoporous transforms into photoactive monoclinic WO3. The excellent feature size contact between crystallites obtained with plasma offers exciting new synthesis route for materials use...
A model equating the growth rate of tungsten fuzz on a plasma-exposed surface to erosion fuzzy is developed predict likelihood formation in steady-state environment toroidal confinement devices. To date this question has not been answered because operational conditions existing magnetic machines do necessarily replicate those expected future fusion reactors (i.e. high-fluence operation, high temperature plasma-facing materials and edge plasma relatively free condensable impurities). The...
As a licensed nuclear facility, ITER must limit the in-vessel tritium (T) retention to reduce risks of potential release during accidents, inventory being set at 1 kg. Simulations and extrapolations from existing experiments indicate that T-retention in will mainly be driven by co-deposition with beryllium (Be) eroded first wall, co-deposits forming divertor region but also possibly on wall itself. A pulsed Laser-Induced Desorption (LID) system, called Tritium Monitor, is designed locally...
Different mechanisms contribute to tritium retention in ITER, amongst which co-deposition with materials from the plasma-facing components is one of main contributors. A systematic study influence deposition conditions (substrate temperature, rate, energy incident particles) on deuterium co-deposited beryllium layers has been carried out PISCES-B. The mechanism by co-deposits appears be a combination and implantation, decreased for increased rate an particle energy. scaling equation...