910 research outputs found
Applicazione della teoria dei valori estremi all’analisi statistica degli eventi di pioggia intensa nel varesotto (1991-2010)
No full textSystem for temperature and power flux measurements on the RFX first wall
No full textA thermal imaging system has been installed on the RFX at Consorzio RFX to investigate the phenomenology of the plasma wall interactions. The infrared camera, model Amber AE4128, is based on a 128×128 InSb focal plane array detector and operates in the range of 4.5–5 μm with an acquisition rate of 217 Hz and 12 bit of dynamic range. The system, absolutely calibrated, is sensitive from room temperature up to 3000 °C, with different setups. The experimental data are compared with the numerical results obtained by means of transient thermal analyses carried out on analytical and finite element models of a graphite tile
Supplemental_Material.Davy - Short-term changes in added sugar consumption by adolescents reflected in the carbon isotope ratio of fingerstick blood
No full textSupplemental_Material.Davy for Short-term changes in added sugar consumption by adolescents reflected in the carbon isotope ratio of fingerstick blood by Sarah V Liu, Lori B Moore, Tanya M Halliday, A Hope Jahren, Jyoti Savla, Valisa E Hedrick, Elaina L Marinik, and Brenda M Davy in Nutrition and Health</p
Particle control systems at the edge of RFP experiments
No full textPlasma performance in reversed field pinch (RFP) devices, as in the tokamak, is strongly affected by neutrals at the edge. So far only a few experiments have been dedicated to an active control of the neutral particle using conventional solutions of axisymmetric magnetic divertors or throat limiters. The alternative `vented pump limiter' concept is more attractive for an RFP experiment due to the edge plasma and confinement properties of this magnetic configuration. In this paper, the application of a vented pump limiter to an RFP is discussed and the prototype module of the vented pump limiter designed for the RFX experiment is presented. Finally, the optimization of this concept for a next step RFP device is presented
Requirements and modelling of fast particle injection in RFX-mod tokamak plasmas
No full textThe planned upgrade of the RFX-mod device is a good opportunity to widen the operational space of the machine, in both RFP and tokamak configurations. Installation of a power neutral beam injector is also envisaged and a NB system compatible with RFX-mod, formerly installed in TPE-RX, is already available on site. In this work, the METIS simulator is used to study the feasibility of TPE-RX injector integration in RFX-mod circular tokamak plasmas. METIS code allows the simulation of a full tokamak discharge, with the addition of the neutral beam injection (NBI) which, in METIS, is described by a decay equation applied in a simplified geometry and an analytical solution of the Fokker–Planck equation. In this work, RFX-mod scenarios with NBI have been studied, with careful attention to the beam absorption and plasma response to the additional heating
Electron temperature diagnostics in the RFX reversed field pinch experiment
No full textThe paper presents an integrated approach to the problem of electron temperature diagnostics of the plasma in a reversed field pinch. Three different methods, sampling different portions of the electron distribution function, are adopted, namely Thomson scattering, soft X-ray spectroscopy by pulse-height analysis and filtered soft X-ray intensity ratio. A careful analysis of the different sources of systematic errors is performed and a novel statistical approach is adopted to mutually validate the three independent measurements. A satisfactory agreement is obtained over a large range of experimental conditions, indicating that in the plasma core the energy distribution function is well represented by a maxwellian
Status and Perspectives of a Reversed Field Pinch as a Pilot Neutron Source
No full textFusion-fission hybrid reactors are seen as a possible, mid-term, CO2-free energy source. Starting from the progress in understanding the reversed field pinch plasma confinement, a pilot neutron source with a configuration of R = 4 m and a = 0.8 m and a plasma current of up to 14 mega-ampére (MA) is proposed. A staged experimental approach, with increased complexity and investment, was identified to tackle the existing issues related to scientific and technological aspects and to test the D-T operation at reduced fusion power (P_fus ∼30 MW, Q ∼0.4 , continuous pulsed operation)
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