K. M. Young
A5087910752- Magnetic confinement fusion research
- Fusion materials and technologies
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Nuclear Physics and Applications
- Plasma Diagnostics and Applications
- Laser-Plasma Interactions and Diagnostics
- Nuclear reactor physics and engineering
- Ionosphere and magnetosphere dynamics
- Atomic and Subatomic Physics Research
- Radiation Detection and Scintillator Technologies
- X-ray Spectroscopy and Fluorescence Analysis
- Atomic and Molecular Physics
- Laser-induced spectroscopy and plasma
- Solar and Space Plasma Dynamics
- Muon and positron interactions and applications
- Diamond and Carbon-based Materials Research
- Nuclear Materials and Properties
- Dust and Plasma Wave Phenomena
- Particle Detector Development and Performance
- Electrohydrodynamics and Fluid Dynamics
- Fuel Cells and Related Materials
- Radioactive contamination and transfer
- Advanced Combustion Engine Technologies
- Metal and Thin Film Mechanics
Rolls-Royce (United Kingdom)
2024
Princeton Plasma Physics Laboratory
2002-2021
Lawrence Livermore National Laboratory
2017
National Cheng Kung University
2006
Stress Engineering Services (United States)
2005
Princeton University
1994-2003
Max Planck Institute for Plasma Physics
2002
Isotopen Technologien München (Germany)
2000
Los Alamos National Laboratory
1994-1997
Oak Ridge National Laboratory
1994-1997
In order to support the operation of ITER and planned experimental programme an extensive set plasma first wall measurements will be required. The number type required similar those made on present-day large tokamaks while specification measurements—time spatial resolutions, etc—will in some cases more stringent. Many used real time control driving a requirement for very high reliability systems (diagnostics) that provide measurements.
Neutral-beam heating of plasmas in the Tokamak Fusion Test Reactor at low preinjection densities [${n}_{e}$(0)\ensuremath{\simeq}${10}^{19}$ ${\mathrm{m}}^{\mathrm{\ensuremath{-}}3}$] were characterized by ${T}_{e}$(0)=6.5 keV, ${T}_{i}$(0)=20 ${n}_{e}$(0)=7\ifmmode\times\else\texttimes\fi{}${10}^{19}$ ${\mathrm{m}}^{\mathrm{\ensuremath{-}}3}$, ${\ensuremath{\tau}}_{E}$=170 msec, ${\ensuremath{\beta}}_{\mathrm{theta}}$=2, and a d(d,n${)}^{3}$He neutron emission rate ${10}^{16}$...
K\ensuremath{\alpha} x-ray spectra of heliumlike titanium, Ti xxi, from Tokamak Fusion Test Reactor (TFTR) plasmas have been observed with a high-resolution crystal spectrometer and used as diagnostic central plasma parameters. The data allow detailed comparison recent theoretical predictions for the xxi lines associated satellite spectrum in wavelength range 2.6000 to 2.6400 A\r{}. Improved values excitation rate coefficients resonance line, intercombination lines, forbidden new results on...
The proposed Fusion Nuclear Science Facility (FNSF) represents the first facility to enter complex fusion nuclear regime, and its technical mission attributes are being developed. FNSF one part of energy development pathway commercial power plant with other major components pre-FNSF research development, in parallel FNSF, pre-DEMO demonstration (DEMO). Energy Systems Studies group is developing basis for order provide a better understanding demands on plasma science programs.
Stability diagrams are calculated for hydromagnetic kink instabilities in a zero-pressure plasma confined stellarator geometry with arbitrary mixtures of l = 2 and 3 multipolar helical fields various radial distributions the current parallel to confining magnetic field. The introduction small pressure gradients increases size unstable regions. Modes azimuthal wavenumber grow more rapidly than those large m. Experimental data, obtained model C Stellarator, show that is macroscopically stable...
We report results of the TFTR fission detector calibration performed in December 1988. A NBS-traceable, remotely controlled 252Cf neutron source was moved toroidally through vacuum vessel. Detection efficiencies for two 235U detectors were measured 930 locations point toroidal scans at 16 different major radii and vertical heights. These effectively simulated volume-distributed plasma volume-integrated detection efficiency found to be insensitive position. The Campbell mode is useful due its...
A review of TFTR plasma transport studies is presented. Parallel and the confinement suprathermal ions are found to be relatively well described by theory. Cross-field thermal plasma, however, anomalous with momentum diffusivity being comparable ion larger than electron in neutral beam heated discharges. Perturbative experiments have studied nonlinear dependencies coefficients examined role possible nonlocal phenomena. The underlying turbulence has been using microwave scattering, emission...
The TFTR tokamak has reached its original machine design specifications (Ip=2.5 MA and BT=5.2 T). Recently, the D degrees neutral beam heating power been increased to 6.3 MW. By operating at low plasma current (Ip approximately=0.8 MA) density (ne approximately=1*1019 m-3), high ion temperatures (9+or-2 keV) rotation speeds (7*105 m/s) have achieved during injection. At opposite extreme, pellet injection into plasmas used increase line-average 8*1019 m-3 central 1.6*1020 m-3. This wide range...
Measurements of the toroidal rotation speed vφ(r) driven by neutral beam injection in tokamak plasmas and, particular, simultaneous profile measurements vφ, Ti, Te, and ne, have provided new insights into nature anomalous transport tokamaks. Low-recycling heated with unidirectional exhibit a strong correlation among local diffusivities, χφ≊χi>χe. Recent confirmed similar behavior broad-density L-mode plasmas. These results are consistent conjecture that electrostatic turbulence is...
Alpha particle loss was measured during the TFTR DT experiments with a scintillator detector located at vessel bottom in ion Del B drift direction. The alpha to this consistent calculated first orbit over whole range of plasma current I=0.6-2.7 MA. In particular, rate per neutron given did not increase significantly fusion power up 10.7 MW, indicating absence any new 'collective' processes these
TSTR (Tokamak Fusion Test Reactor) has operated since December 1982 with ohmically heated plasmas. Routine operation feedback control of plasma current, position and density been obtained for plasmas Ip≃800 kA, a = 68 cm, R 250 Bt=27 kG. A maximum current 1 MA was achieved q≃2.5. Energy confinement times ~150 msec were measured hydrogen deuterium e 2 x 1013 cm-3, Te(0) 2≃1.5 keV, Ti(0) 1.5 keV Zeff≃1 3. The preliminary results suqgest size-cubed scaling from PLT, are consistent Alcator C...
Low m-number fluctuations of floating potential, density, and magnetic fields have been investigated in Ohmically heated discharges the C stellarator. The azimuthal velocity perturbations reverses direction near vD/vi = 1 (vD is electron drift due to current vi ion thermal velocity). For ≳ 1, wave moves at about diamagnetic detailed probe measurements are consistent with mode being current-driven universal instability: amplitude relative phasing indicate that low-m can cause plasma loss. ≲...
Abstract As part of its commitment to the decarbonization aviation sector and UN Race Zero global campaign, Rolls-Royce is actively developing hydrogen combustion gas turbine engine technology capable powering a range aircraft from 2035 onwards. These innovative technologies are undergoing integration validation through demonstrator project, which involves modification Pearl15 for ground testing with gaseous liquid hydrogen. The design an aerospace combustor needs satisfy conventional...
Three natural diamond detectors (NDD) based spectrometry systems have been developed and used on TFTR to perform D–T neutron spectrum flux measurements. DT neutrons interact with the NDD through 12C(n, alpha)9Be reaction produce a narrow peak in pulse height distribution which has 2%–3% energy resolution is well isolated from other reactions by ∼2 MeV energy. The detector also highly radiation resistant (5×1014 n/cm2) compact size (diameter ∼4 mm, thickness ∼0.2 mm). installed near TFTR....