P. Beaumont
A5056699800- Magnetic confinement fusion research
- Fusion materials and technologies
- Superconducting Materials and Applications
- Ionosphere and magnetosphere dynamics
- Particle accelerators and beam dynamics
- Nuclear reactor physics and engineering
- Nuclear Physics and Applications
- Magneto-Optical Properties and Applications
- Nuclear Materials and Properties
- Plasma Diagnostics and Applications
- Magnetic Field Sensors Techniques
- Laser-Plasma Interactions and Diagnostics
- Solar and Space Plasma Dynamics
- Freezing and Crystallization Processes
- Atomic and Subatomic Physics Research
- Ammonia Synthesis and Nitrogen Reduction
- Catalytic Processes in Materials Science
- Muon and positron interactions and applications
- Hydrogen Storage and Materials
- Seismic Waves and Analysis
- Infrared Target Detection Methodologies
- Atomic and Molecular Physics
- Calibration and Measurement Techniques
- Chemical Reactions and Isotopes
- Neural Networks and Reservoir Computing
Savannah River National Laboratory
2019-2024
United Kingdom Atomic Energy Authority
2022-2024
Culham Centre for Fusion Energy
2005-2022
Culham Science Centre
2009-2022
Toshiba (Japan)
2014
Max Planck Society
2013
Forschungszentrum Jülich
2007
Orano (France)
2005
University of Lisbon
2004
The Hunterian
1898
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...
A new technique has been developed to produce plasmas with improved confinement relative the H98,y2 scaling law (ITER Physics Expert Groups on Confinement and Transport Modelling Database ITER Basics Editors EDA 1999 Nucl. Fusion 39 2175) JET tokamak. In mid-size tokamaks ASDEX upgrade DIII-D heating during current formation is used a flat q-profile minimum close 1. On this leads q-profiles similar q but opposite other not an state. By changing method utilizing faster ramp temporary higher...
Abstract The fusion reaction between deuterium and tritium, D ( T,n ) 4 He is the main source of energy in future thermonuclear reactors. Alpha-particles -ions) born with an average 3.5 MeV transferring to thermal plasma during their slowing down, should provide self-sustained D–T burn. adequate confinement α -particles essential efficient heating bulk steady burning a reactor plasma. That why fusion-born -particle studies have been priority task second experiments (DTE2) on Joint European...
A new deuterium-tritium experimental, DTE2, campaign has been conducted at the Joint European Torus (JET) between August 2021 and late December 2021. Motivated by significant enhancements in past decade JET, such as ITER-like wall enhanced auxiliary heating power, achieved a fusion energy world record performed broad range of fundamental experiments to inform ITER physics scenarios operations. New capabilities area product measurements nuclear diagnostics were available result long...
The poloidal distribution of the halo current density on top dump plate in JET can now be measured thanks to a new set Rogowskii coils. These are first measurements able offer an insight width interaction with wall. Therefore they both validation assumption made for disruption design criteria and one additional point extrapolation expected width, hence (and related local electro-mechanical loads in-vessel components) ITER. During upward events, is consistent total current. footprint extends...
Ion cyclotron resonance frequencies (ICRF) mode conversion has been developed for localized on-axis and off-axis bulk electron heating on the JET tokamak. The fast magnetosonic waves launched from low-field side ICRF antennas are mode-converted to short-wavelength high-field of 3He ion layer in D 4He plasmas subsequently damped electrons. resulting power deposition, measured using modulation, is narrow with a typical full-width at half-maximum ≈30 cm (i.e. about 30% minor radius) total...
Measurements of the ion currents to and plasma conditions at low-field side (LFS) divertor target plate in low-confinement mode plasmas JET ITER-like wall materials configuration show that core density required detach LFS is independent hydrogenic species protium, deuterium tritium, a 40 %/60 % deuterium–tritium mixture. This observation applies with strike line connected horizontal part chosen because its superior diagnostic coverage. The finding operational status cryogenic pump. electron...
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...
During the initial operation of International Thermonuclear Experimental Reactor (ITER), it is envisaged that activation will be minimized by using hydrogen (H) plasmas where reference ion cyclotron resonance frequency (ICRF) heating scenarios rely on minority species such as helium (3He) or deuterium (D). This paper firstly describes experiments dedicated to study 3He in H with a sequence discharges which 5 MW ICRF power was reliably coupled and concentration, controlled real-time, varied...
Good coupling of lower hybrid (LH) waves has been demonstrated in different H-mode scenarios JET, at high triangularity (δ ∼ 0.4) and large distance between the last closed flux surface LH launcher (up to 15 cm). Local gas injection D2 region magnetically connected is used for increasing local density scrape-off layer (SOL). Reciprocating Langmuir probe measurements indicate that electron profile flattens far SOL during power application. Some degradation normalized confinement, as given by...
Upgrades to electronic hardware and detector design have been made the JET thin-foil Faraday cup fast ion loss [Darrow et al., Rev. Sci. Instrum. 75, 3566 (2004)] in anticipation of upcoming deuterium–tritium (DT) campaign. An improved foil stack has implemented, which greatly reduces number foil-to-foil shorts, triaxial cabling mitigated ambient noise pickup. Initial tests 200 kHz digitizers, as opposed original 5 provided enhanced analysis techniques direct coherence measurements losses...
This article describes a neutral particle analyzer/isotope separator (ISEP) developed for measurement of the relative hydrogen isotope composition Joint European Torus (JET) plasmas. The ISEP deployed on JET can be regarded as prototype an instrument proposed spatial profile ratio density deuterium and tritium ions in plasma, nD(r)/nT(r), International Thermonuclear Experimental Reactor (ITER). makes simultaneous measurements energy distribution efflux atoms (H, D, T) from plasma. From such...
This paper reports on ITER-relevant ion cyclotron resonance frequency (ICRF) physics investigated JET in 2003 and early 2004. Minority heating of helium three hydrogen plasmas—(3He)H—was systematically explored by varying the 3He concentration toroidal phasing antenna arrays. The best performance (a maximum electron temperature 6.2 keV with 5 MW ICRF power) was obtained a preferential wave launch direction plasma current. A clear experimental demonstration made sharp reproducible transition...
Radio frequency (RF) heating experiments have recently been conducted in JET (3He)–H plasmas. This type of plasmas will be used ITER's non-activated operation phase. Whereas a companion paper this same PPCF issue discuss the RF scenario's at half nominal magnetic field, documents performance full with fundamental cyclotron 3He as only possible ion scheme view foreseen ITER antenna bandwidth. Dominant electron global efficiencies between 30% and 70% depending on concentration were observed...
During development of a high-performance hybrid scenario for future deuterium–tritium experiments on the Joint European Torus, an increased level fast ion losses in MeV energy range was observed during instability high-frequency n = 1 fishbones. The fishbones are excited deuterium neutral beam injection combined with cyclotron heating. frequency fishbones, 10–25 kHz, indicates that they driven by resonant interaction NBI-produced ions ⩽120 keV. particle much higher measured loss detector,...
In the past years, one of focal points JET experimental programme was on ion-cyclotron resonance heating (ICRH) studies in view design and exploitation ICRH system being developed for ITER. this brief review, some main achievements obtained field during last 5 years will be summarized. The results reported here include important aspects a more engineering nature, such as (i) appropriate RF feeding circuits optimal load resilient operation (ii) test compact high-power density antenna array,...
The JET FILD is a scintillator-based Fast-ion Loss Detector optimized to measure fusion-born alpha-particle losses. This work covers its upgrade and absolute calibration in preparation for the following DT experiments. A fast scintillator material (TG-Green) has been installed FILD. heater jacket around fiber bundle, responsible transmitting light from plate, anneal obscuring due neutron damage. upgraded with 1 Mpx camera 2 MHz photomultiplier data acquisition hardware. Full-orbit...
The magnetic moments and angular momenta of Solar System bodies are compared to evaluate the statistical reality relation that has come be called “magnetic Bode law.” Runcorn suggested this “law”, giving a slope about 3/5 on log‐log plot, is only geometrical effect being proportional fifth power radius moment cube. best fit line six planets with nonzero fields log( m / e ) = −0.2 (±0.2) + 0.82 (±0.05) L ), where subscripts denote values for Earth. value shown consistent once estimation bias...
JET equipped with ITER-like wall (a beryllium and a tungsten divertor) can provide auxiliary heating power up to 35MW, producing significant population of α-particles in DT operation. The direct measurements alphas are very difficult α-particle studies require development dedicated diagnostics. now has an excellent set confined lost fast particle diagnostics for measuring the source its evolution space time, energy distribution, losses. This paper describes how above mentioned diagnostic...
Fast wave current drive (FWCD) experiments have been performed in JET plasmas with electron internal transport barriers produced LHCD. Because of a large fraction parasitic absorption, owing to weak single pass damping, the inductive nature plasma and interplay between RF-driven bootstrap only small changes are seen central profiles. The measured difference density for co- counter-current is larger than response expected from diffusion calculations, but smaller driven currents, suggesting...