A5022039634- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Fusion materials and technologies
- Plasma Diagnostics and Applications
- Superconducting Materials and Applications
- Laser-Plasma Interactions and Diagnostics
- Electron and X-Ray Spectroscopy Techniques
- Nuclear Materials and Properties
- Advanced Combinatorial Mathematics
- Geometric and Algebraic Topology
- Particle Accelerators and Free-Electron Lasers
- Spacecraft and Cryogenic Technologies
- Laser-induced spectroscopy and plasma
- Ion-surface interactions and analysis
- Nuclear Physics and Applications
- Pulsed Power Technology Applications
- Mass Spectrometry Techniques and Applications
- semigroups and automata theory
- Gyrotron and Vacuum Electronics Research
- Analytical Chemistry and Sensors
- Microfluidic and Capillary Electrophoresis Applications
- Nuclear reactor physics and engineering
- Atomic and Molecular Physics
- Crystallography and Radiation Phenomena
- Mechanical and Thermal Properties Analysis
Monash University
2023
Joint European Torus
1987-2002
Max Planck Institute for Plasma Physics
1995
Max Planck Society
1995
United Kingdom Atomic Energy Authority
1967-1981
Culham Science Centre
1967-1981
Culham Centre for Fusion Energy
1970-1981
Massachusetts Institute of Technology
1963
Experiments in the JET tokamak with additional heating power (ion cyclotron resonance and/or neutral beam injection) above 5 MW show that plasma can undergo a transition to new regime. In this regime, sawtooth instability is suppressed for periods up 1.6 s and level of long-wavelength, coherent MHD activity very low. An improvement global energy confinement time 20% observed. Possible mechanisms stabilization m=1 implications near-ignition regime are discussed.Received 26 May...
Neutral beam heating data from JET have been analysed in detail to determine what proportion of the current is driven non-inductively. It found that low density limiter discharges, currents order 0.5 MA are driven, while H-mode plasmas 0.7 measured. These measured be reasonable agreement with theoretical predictions based on neoclassical models. In large bootstrap dominates plasmas.
AbstractThe development of the neutral injection (NI) system for Joint European Torus and its status in 1985 are reported. First parameters discussed layout is described, followed by a summary physics design calculations, development, production, testing components subsystem assembly. The commissioning presented subsequently, including description function realization NI test bed. A performance predictions 80-keV beam heating experiments, experimental evidence on balanced versus coinjection,...
Received 29 November 1962DOI:https://doi.org/10.1103/PhysRevLett.10.89©1963 American Physical Society
Ultrasound treatment is an effective food processing method that improves the extraction and usability of plant-based antioxidants. This study examines how ultrasound affects polyphenols, flavonoids anthocyanins from vegetables plant extracts, as well their stability during storage. Results show ultrasound-assisted increases efficiency these antioxidants enhances activity. In addition, different frequencies power levels lead to varying rates compound breakdown. These findings support use in...
The neutral beam injection (NBI) system of the Joint European Torus (JET) [Plasma Physics and Controlled Nuclear Fusion Research (International Atomic Energy Agency, Vienna, 1985), Vol. 1, p. 11] has proved to be an extremely effective flexible heating method capable producing high performance plasmas performing a wide range related physics experiments. High fusion deuterium have been obtained in hot-ion (HI) H-mode regime, using central particle fueling ion capabilities NBI low target...
A model of beam steering and collimation in tetrode extraction systems is presented which includes the effects space charge interelectrode gaps. This compared with experiment several geometries shows that inclusion allows better agreement to be obtained than earlier theories.
The ion cyclotron instabilities in the PHOENIX high energy injection mirror machine have been suppressed by applying oscillating electric fields. Two appear to be present. One is spreading and suppression of other appears due effect applied fields on electrons.
Knots obtained by Dehn filling the Whitehead sister include some of smallest volume twisted torus knots. Here, using results on A-polynomials fillings, we give formulas to compute these Our methods also apply more general fillings sister.
This paper describes results obtained with a hot cathode constricted arc plasma source and single aperture three electrode accel-decel extraction system. The energy range covered is 5–25 keV for positive ions 1.7–12.5 neutral beams. Ion currents of the order 80 mA H3+ 100 He+ at higher energies have been through 3.8 cm diam distance 180 from source. performance as injector has evaluated by using present PHOENIX II experiment. Finally, relationship between experiment theory limitations this...
An integrated chevron type cryopump system for the JET pumped divertor program consisting of two independent 180/spl deg/ elements has been operational at since mid 1994. The pumping speed pump in situ torus is /spl sim/200000 l/s being limited by conductance water-cooled high heat flux front cryopump. LN shield provides a impurities such as water and hydrocarbons. argon spray facility enables deposition frost directly onto to He-gas cryosorption. He found be nearly same D/sub 2/. operation...
A compact ion source is described with a beam brightness of 9*108 mA mm-2 sr-1 which can operate continuously at 50 kV giving current density up to 1.1 mm-2. This has proton yield over 55% and been designed as pre-injector for use in particle accelerators or meson facilities. Without changing the design, except extraction apertures, it could produce multiple aperture 2A.
Preliminary experiments were carried out in the Joint European Torus (JET) using 120 keV helium (He) neutral beam injection (NBI). Injected power levels up to 5 MW with 3He and 7 4He, lasting 3 s reached. The NBI produced efficient ion heating similar global local energy confinements those obtained deuterium (D) NBI, both limiter X-point plasma geometries, L-mode H-mode regimes. elimination of beam-plasma beam-beam fusion reactions by replacing D He extended range for measuring temperatures...
Hydrogen beams at particle energies of up to 65 keV, total beam powers 5.5 MW , and beam-pulse durations 7 s have been injected into deuterium plasmas. Experiments were performed over a wide range plasma parameters with limiter plasmas inner-wall The operational regime was extended by 70% the current ohmic density limit. In medium experiments, ion temperatures ca . 6.5 keV reached electron 4.8 keV. expected degradation energy confinement additional heating observed. At 4 MA 8 input power,...