A5110660435- Magnetic confinement fusion research
- Superconducting Materials and Applications
- Fusion materials and technologies
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Particle accelerators and beam dynamics
- Astronomical Observations and Instrumentation
- Nuclear reactor physics and engineering
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Plasma Diagnostics and Applications
- Ionosphere and magnetosphere dynamics
- Space Exploration and Technology
- Smart Grid Energy Management
- Nuclear Physics and Applications
- Laser-Plasma Interactions and Diagnostics
- Electromagnetic Launch and Propulsion Technology
- Italian Literature and Culture
- History and Developments in Astronomy
- Arctic and Antarctic ice dynamics
- Thermal Analysis in Power Transmission
- Smart Grid Security and Resilience
- Magnetic Properties and Applications
- Iron and Steelmaking Processes
- Advanced Research in Science and Engineering
Osservatorio Astronomico della Regione Autonoma Valle d'Aosta
2010-2019
Astronomical Observatory
2010
Joint European Torus
1989-2003
European Union
2002
Culham Science Centre
1976-2001
National Nuclear Energy Commission
1976
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
1968
During a Joint European Torus pulse, the main tokamak loads [the toroidal coils, transformer plasma equilibrium and additional heating devices (not described in this work)] require total amount of energy 10000 MJ peak power excess 1000 MW.The source is U.K.'s Central Electricity Generating Boards' electric system supplemented by two identical local motor flywheel generators.Since direct-current (dc) supply, alternating-current from sources converted into dc combination thyristor bridges...
First, we summarize the four-year long efforts undertaken to build final setup of APACHE Project, a photometric transit search for small-size planets orbiting bright, low-mass M dwarfs. Next, describe present status survey, officially started in July 2012 at site Astronomical Observatory Autonomous Region Aosta Valley, Western Italian Alps. Finally, briefly discuss potentially far-reaching consequences multi-technique characterization program (potentially planet-bearing) targets.
XO-2 is the first confirmed wide stellar binary system where almost twin components XO-2N and XO-2S have planets. This stimulated a detailed characterization study of planetary based on new observations. We collected high-resolution spectra with HARPS-N spectrograph multi-band light curves. Spectral analysis led to an accurate determination atmospheric parameters activity. 14 transit curves XO-2Nb used improve parameters. Photometry provided magnitude differences between stars measure their...
We present the results of a year-long photometric monitoring campaign sample 23 nearby (d < 60 pc), bright (J 12) dM stars carried out at Astronomical Observatory Autonomous Region Aosta Valley, in western Italian Alps. This programme represents ‘;pilot study’ for long-term transit search planets around large M dwarfs, due to start with an array identical 40-cm class telescopes by Spring 2012. In this study, we set (i) demonstrate sensitivity <4 R⊕ transiting periods few days our stars,...
Two antennae have been installed in JET and operated to the maximum design capability of generators. 4.5 MW, 10 MJ coupled plasma which heated up a stored energy 3 with central temperatures Te0=5 keV Ti0=4 without increase relative impurity concentration. Degradation confinement is observed according an L mode scaling. The effect k/sub //// shaping discussed using quadrupole antenna. Hydrogen helium minority heating regimes give similar results.
Effects of enhanced toroidal field ripple on JET plasmas, G Sadler, P Barabaschi, E Bertolini, S Conroy, Corti, Deksnis, K J Dietz, H L de Esch, A Gondhalekar, B Green, M Huart, Huguet, Jacquinot, O N Jarvis, Khudoleev, Loughlin, R Konig, Last, Maas, Petrov, Putvinskii, C Sborchia, D Stork, Tubbing, van Belle
ABSTRACT We present rotation period measurements for 107 M dwarfs in the mass range $0.15\!-\!0.70 \, \mathrm{M}_\odot$ observed within context of APACHE photometric survey. measure periods 0.5–190 d, with distribution peaking at ∼30 d. revise stellar masses and radii our sample rotators by exploiting Gaia DR2 data. For ${\sim}20{{\ \rm per\ cent}}$ sample, we compare those derived from different spectroscopic indicators, finding good correspondence most cases. to one obtained Kepler survey...
As a first step in the JET ICRF programme, two antenna generator units have been installed at and operated up to design specification of 3 MW coupled Torus for 1 second. After brief description system, experimental results wave coupling plasma matching loaded are discussed. The heating presented concentrating on analysis case where total power increases by ratio 2.5.
The International Atomic Energy Agency convened, in the framework of its Fusion Technology and Engineering Programme, 4th Technical Committee Workshop on Reactor Design at Yalta, USSR, from 26 May – 6 June 1986. This report contains all summaries sessions that were organized during workshop. papers presented meeting are being published by Proceedings Series.
We present the results of a site characterization study carried out at Astronomical Observatory Autonomous Region Aosta Valley (OAVdA), in Western Italian Alps, aimed establishing its potential to host photometric transit search for small-size planets around statistically significant sample nearby cool M dwarfs. [abridged] we gauged site-dependent observing conditions such as night-sky brightness, precision, and seeing properties. Public meteorological data were also used order help...
Heating the JET plasma well above temperatures reached in ohmic phase is aim of two additional heating systems planned for JET: ion cyclotron resonance (ICRF) and neutral beam injection (NBI). Operations with latter started February 1986, initially hydrogen injection, up to a power level 7 MW. ICRF has been delivered by three antennae levels 6 MW 2 s. In most experiments, frequency waves adjusted position minority layer close centre discharge, resulting centrally peaked deposition profile....
Since 1994 the JET experiment has been operated with a divertor, currents up to 6MA. Disruptions are generally accompanied by vertical plasma displacements giving rise forces at torus. Vertical force swings 5MN were recorded vessel supports. The toroidally non-uniform, peaking factors 1.8. Global sideways of torus, about 5 mm, also in number disruptions. They interpreted as consequence large amplitude m=1, n=1 kink mode. led damage some components inside and outside vessel, such internal...
Three of the toroidal field (TF) coils JET tokamak have developed interturn faults. These faults not been catastrophic and it has possible to continue operation replace faulty with spares at next pre-planned shutdown. The were found be due water leaks. coil coolant was changed from an insulating fluid. All known latest measurements do detect any on installed coils.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
JET PROGRESS TOWARDS D-T OPERATION, M. Huguet and E. Bertolini --- Upgrading of the experiment has allowed operation at plasma currents up to 7MA with material limiter 5MA in X-point mode. Key experimental results include record values fusion parameter . Future machine enhancements cooled target plates for high power operation, beryllium as a first wall 12MW Lower Hybrid Current Drive system order achieve peaked profiles. The plant which will reprocess tritiated exhaust gasses from torus...
An overview of the present design ITER coil power supply system is presented, along with brief descriptions main components including AC/DC converters, switching networks, and discharge circuits.
The technical status of the JET (Joint European Torus) machine and essential systems used during 1989 experimental campaign are described. vacuum vessel has been mechanically reinforced is now able to resist safely large disruption forces at plasma currents up 7 MA. An electrical fault developed in one toroidal field coils, although operation continuing, coil replacement planned take place by end 1989. use a beryllium first wall salient feature technological safety aspects operating with...