A5088598751- Ship Hydrodynamics and Maneuverability
- Magnetic confinement fusion research
- Fusion materials and technologies
- Maritime Transport Emissions and Efficiency
- Sports Performance and Training
- Fluid Dynamics Simulations and Interactions
- Superconducting Materials and Applications
- Spacecraft and Cryogenic Technologies
- Structural Health Monitoring Techniques
- Biomimetic flight and propulsion mechanisms
- Fluid Dynamics and Vibration Analysis
- Optical measurement and interference techniques
- Aerodynamics and Fluid Dynamics Research
- Sports Dynamics and Biomechanics
- Wind and Air Flow Studies
- Structural Integrity and Reliability Analysis
- Wind Energy Research and Development
- Aerospace Engineering and Energy Systems
- Fluid Dynamics and Turbulent Flows
- Nuclear reactor physics and engineering
- Winter Sports Injuries and Performance
- Coronary Interventions and Diagnostics
- Cardiovascular Health and Disease Prevention
- Particle accelerators and beam dynamics
- Nuclear Materials and Properties
Culham Science Centre
2005-2024
United Kingdom Atomic Energy Authority
2022-2024
University of Southampton
2011-2023
Royal Military Academy
2020
Culham Centre for Fusion Energy
2005-2013
University of Portsmouth
2003
Instituto de Historia
2003
Academia Nacional de Medicina
2003
JET underwent a transformation from full carbon-dominated tokamak to fully metallic device with beryllium in the main chamber and tungsten divertor. This material combination is foreseen for activated phase of ITER. The ITER-Like Wall (ILW) experiment at shall demonstrate plasma compatibility walls reduction fuel retention. We report on set experiments (Ip = 2.0 MA, Bt 2.0–2.4 T, δ 0.2–0.4) different confinement conditions global gas balance analysis demonstrating strong long-term retention...
Abstract The JET 2019–2020 scientific and technological programme exploited the results of years concerted engineering work, including ITER-like wall (ILW: Be W divertor) installed in 2010, improved diagnostic capabilities now fully available, a major neutral beam injection upgrade providing record power 2019–2020, tested technical procedural preparation for safe operation with tritium. Research along three complementary axes yielded wealth new results. Firstly, plasma delivered scenarios...
Abstract In 2021 JET exploited its unique capabilities to operate with T and D–T fuel an ITER-like Be/W wall (JET-ILW). This second major campaign (DTE2), after DTE1 in 1997, represented the culmination of a series enhancements—new fusion diagnostics, new injection capabilities, refurbishment plant, increased auxiliary heating, in-vessel calibration 14 MeV neutron yield monitors—as well as significant advances plasma theory modelling community. DTE2 was complemented by sequence isotope...
Abstract For the past several years, JET scientific programme (Pamela et al 2007 Fusion Eng. Des . 82 590) has been engaged in a multi-campaign effort, including experiments D, H and T, leading up to 2020 first with 50%/50% D–T mixtures since 1997 ever plasmas ITER mix of plasma-facing component materials. this purpose, concerted physics technology was launched view prepare campaign (DTE2). This paper addresses key elements developed by directly contributing preparation. intense preparation...
Abstract After the second Deuterium–Tritium Campaign (DTE2) in JET tokamak with ITER-Like Wall (ILW) and full tritium campaigns that preceded followed after DTE2, a sequence of fuel recovery methods was applied to promote removal from wall components. The started several days baking main chamber walls at 240 °C 320 °C. Subsequently, superimposed Ion-Cyclotron Conditioning (ICWC) Glow Discharge (GDC) cleaning cycles deuterium. Diverted plasma operation deuterium different strike point...
The objective of thermonuclear fusion consists producing electricity from the coalescence light nuclei in high temperature plasmas. most promising route to envisages confinement such plasmas with magnetic fields, whose studied configuration is tokamak. Disruptions are catastrophic collapses affecting all tokamak devices and one main potential showstoppers on a commercial reactor. In this work we report how, deploying innovative analysis methods thousands JET experiments covering isotopic...
Under normal healthy conditions, blood flow in the carotid artery bifurcation is laminar. However, presence of a stenosis, can become turbulent at higher Reynolds numbers during systole. There growing consensus that transitional k−ω model best suited averaged turbulence for such flows. Further confirmation this opinion presented here by comparison with RNG k−ϵ through straight, nonbifurcating tube. Unlike similar validation studies elsewhere, no assumptions are made about inlet profile since...
Abstract A sequence of fuel recovery methods was tested in JET, equipped with the ITER-like beryllium main chamber wall and tungsten divertor, to reduce plasma deuterium concentration less than 1% preparation for operation tritium. This also a key activity regard refining clean-up strategy be implemented at end 2nd DT campaign JET (DTE2) assess tools that are envisaged mitigate tritium inventory build-up ITER. The began 4 days baking 320 °C, followed by further which Ion Cyclotron Wall...
Installing an energy saving device such as a pre-swirl duct (PSD) is major investment for ship owner and prior to order reliable prediction of the savings required. Currently there no standard how be carried out, possible alternatives are both model-scale tests in towing tanks with associated scaling procedures, well methods based on computational fluid dynamics (CFD). This paper summarizes CFD benchmark study comparing industrial state-of-the-art ship-scale predictions power reduction...
Abstract JET, the world’s largest operating tokamak with unique Be/W wall and tritium handling capability, completed a Deuterium-Tritium (D-T) campaign in 2021 (Maggi et al 29th Fusion Energy Conf. ) following decade of preparatory experiments, dedicated enhancements, technical rehearsals training (Horton 2016 Eng. Des. 109–111 925). Operation raises significant technical, safety scientific challenges not encountered standard protium or deuterium operation. This contribution describes...
In order to understand the physical origin of passive resistance in swimming breakdown for a swimmer is investigated. A combination empirical methods and theoretical analysis used predict speed range 0 – 2 ms-1 shown provide similar results those from experimental testing. Typical magnitudes wave, viscous pressure skin friction contribute 59%, 33% 8% total respectively at free swim speed. comparison made between widely Velocity Perturbation Method Naval Architecture based approach predicting...
As part of the JET Programme in Support for ITER, campaigns with pure Tritium (TT) fuel and Deuterium-Tritium (DT) mixtures are planned at JET. Unlike previous DT a much higher tritium flow rate, particularly during TT operation, is required. Five Introduction Modules (TIMs), fed from Active Gas Handling System (AGHS), to be installed; three divertor region, one mid-plane another top machine. The selected TIM locations, design operational characteristics, were chosen so that most existing...
A sprint kayak experiences an unsteady flow regime due to the local influence of paddle. However, designs are usually optimised for steady-state, naked hull resistance. To determine whether paddle effects need be included in design, hydrodynamic interactions between a and assessed using computational fluid dynamics. body force model drag-based stroke is developed blade element approach validated against experimental data. This allows paddle-induced velocities simulated without fully resolve...
This study assessed current swimming coaching practices surrounding underwater fly kick. Ten elite coaches completed face-to-face interviews, and 56 an online survey. Coaches use a range of methods both in out the pool to develop key aspects Sixty eight percent reported they do not have access resources that would aid with their ability Results show are considering variables when attempting improve kick, three most important highlighted as kick frequency, symmetry coordination. Coordination...
AbstractThe accuracy of process measurements tritium with conventional ion chambers is often affected by surface contamination. The measurement in the exhaust JET torus particularly difficult due to contamination highly tritiated hydrocarbons. JET’s first unsuccessful attempt overcome problem was use an chamber, a heating element as chamber wall so that it could be periodically decontaminated baking. newly developed works on principle minimising area within boundary anode and cathode.This...
Abstract The aim of this research is to quantify the membrane deformations and their impact on performance for a ribbed wing sail. A 1m x 0.8m rectangular planform NACA0012 foil was designed replicate single section wing-sail. Two foils were manufactured based geometry, one out solid foam using rib structure. These tested in R.J. Mitchell closed return 3.6 m 2.5 wind tunnel at University Southampton. Their aerodynamic assessed over range angles attack six-component force balance showing...