A5071200460- Magnetic confinement fusion research
- Radioactive contamination and transfer
- Radioactivity and Radon Measurements
- Particle accelerators and beam dynamics
- Nuclear and radioactivity studies
- Fusion materials and technologies
- Superconducting Materials and Applications
- Laser-Plasma Interactions and Diagnostics
- Graphite, nuclear technology, radiation studies
- Ionosphere and magnetosphere dynamics
- Nuclear reactor physics and engineering
- Radioactive element chemistry and processing
- Meteorological Phenomena and Simulations
- Geophysics and Gravity Measurements
- Radiation Detection and Scintillator Technologies
- Probabilistic and Robust Engineering Design
- Solar and Space Plasma Dynamics
- Wind and Air Flow Studies
- Soil and Unsaturated Flow
- Advanced Radiotherapy Techniques
- Risk Perception and Management
- Nuclear Physics and Applications
- Climate variability and models
- Atmospheric chemistry and aerosols
- Particle Accelerators and Free-Electron Lasers
Federal Office for Radiation Protection
2017-2024
Helmholtz Zentrum München
2011-2013
Max Planck Institute for Plasma Physics
2006-2011
Max Planck Society
2006-2010
Max Planck Innovation
2007
University of Padua
2005
Neoclassical tearing modes (NTMs) will be the principal limit on performance in ITER standard scenario, which has beta well below ideal kink limit. Measurements of island size from ASDEX Upgrade, DIII-D and JET rampdown experiments are used to determine marginal for m/n = 3/2 NTM removal. This is compared with data JT-60U removal by electron cyclotron current drive (ECCD) at near constant beta. The empirical consistent both sets found about twice ion banana width. A common methodology...
The results of stabilizing neoclassical tearing modes (NTMs) with electron cyclotron current drive (ECCD) in JT-60U are described emphasis on the effectiveness stabilization. range minimum EC wave power needed for complete stabilization an m / n = 2/1 NTM was experimentally identified two regimes using unmodulated ECCD to clarify behaviours different plasma parameters: 0.2 < j BS 0.4 W sat d ∼ 3 and marg 2, 0.35 0.46 1.5 2. Here, poloidal toroidal mode numbers; EC-driven density bootstrap...
The use of ECRH has been investigated as a promising technique to avoid or postpone disruptions in dedicated experiments FTU and ASDEX Upgrade. Disruptions have produced by injecting Mo through laser blow-off (FTU) puffing deuterium gas above the Greenwald limit (FTU Upgrade). toroidal magnetic field is kept fixed launching mirrors steered before every discharge order change deposition radius. loop voltage signal used disruption precursor trigger power plasma current quench. In (Ip =...
Neoclassical tearing modes (NTMs) are experimentally controlled with local electron cyclotron current drive (ECCD) and the island width decay during NTM stabilization is modelled using so-called modified Rutherford equation (MRE). In this paper, a modelling of MRE carried out simulations compared observed ones in order to fit two free machine-independent parameters present equation. A systematic study on database discharges from ASDEX Upgrade JT-60U done for extrapolating ECCD power...
The predictions of the generalised Rutherford equation for stabilisation neoclassical tearing modes (NTMs) are reviewed. They suggest that efficiency can be maximised by maximising current density within island, favouring narrow deposition over maximum total current. Also, ITER, where it is expected minimum island size before will small with respect to width, a loss continuous injection predicted, but recovered phased island's O-point. paper compares in detail these dedicated experiments on...
Despite the EU states being under umbrella of European Directive 2013/59/Euratom, a certain degree heterogeneity may be noticed in implementation recommendations concerning regulation and handling NORM into national legislation practice. This is mainly result still existing incomplete international knowledge about different phenomena related to NORM. Therefore, attempt advance understanding behaviour exposure at core RadoNorm project. Within this context, an survey on has been prepared. The...
A German dataset with soil-plant transfer factors for radiocaesium including many co-variables was analysed and prepared the application of Random Forest (RF) algorithm using R libraries 'party', 'caret'. RF predictive model factor created based on 10 co-variables. These are, example, taxonomic plant family, part, soil type exchangeable potassium concentration in soil. The results were compared two (semi-)mechanistic models. Of more than 3000 entries original dataset, only about 1200 could...
This paper describes a form of the generalised Rutherford Equation for Neoclassical Tearing Modes suited to fit experiments. All relevant terms contributing perturbed current parallel magneticfield have been included both in cases small or large island limit; we present ASDEX Upgrade experimental data.
In Europe, the general obligation to recycle drives for increased reuse of residues containing Naturally Occurring Radioactive Material (NORM). agriculture, this has led sludge produced by groundwater filtration facilities as a means fertilization. frame RadoNorm project, methodology was developed dose assessment agricultural workers and other members public living near fields in which NORM-containing is applied. Appropriate exposure scenarios were identified modelled each relevant NORM...
Locations of gamma dose rate sensors have often been chosen by administrative or geometrical criteria. Nowadays computational capacity allows for a more realistic basis. We use simulations potential radioactive plumes based on weather data one year to investigate the threats regions without own nuclear power plants and find good numbers locations detect such plumes. optimise sensor minimising cost function that can take into account undetected plumes, their region in general, population....
The determination of the free parameters present in modified Rutherford equation (MRE), which is routinely used for studying physics neoclassical tearing mode (NTM) stabilization, addressed by making use Bayesian probability theory. evaluation coefficients particularly sensitive to assumptions modelled equation, correlation various physical and uncertainties experimental measurements. A probabilistic method was applied consistent their using a large database discharges considering...
Journal Article A fast and simple approach for the estimation of a radiological source from localised measurements after explosion dispersal device Get access L. Urso, Urso 1Institut für Strahlenschutz (ISS) – Helmholtz Zentrum München HMGU, Ingolstädter Landstrasse 1, 85764 Neuherberg, Germany Search other works by this author on: Oxford Academic PubMed Google Scholar J. C. Kaiser, Kaiser * *Corresponding author: christian.kaiser@helmholtz-muenchen.de Woda, Woda Helebrant, Helebrant...
The Urban Areas Working Group is part of the International Atomic Energy Agency's EMRAS II (Environmental Modelling for Radiation Safety) Programme. goal this to test and improve capabilities models used in assessment radioactive contamination urban settings, including dispersion deposition events, short- long-term contaminant redistribution following potential countermeasures or remediation efforts reducing human exposures doses. has developed three modeling exercises, which are designed...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation G. Granucci, B. Esposito, M. Maraschek, S. Nowak, J. R. Martin‐Solis, W. Bin, A. Botrugno, L. Gabellieri, E. Lazzaro, Pautasso, Romano, P. Smeulders, Stober, Treutterer, O. Tudisco, Urso, F. Volpe, H. Zohm, FTU Upgrade teams, ASDEX teams; ECRH: A Tool To Control Disruptions In Tokamaks. AIP Conference...
Conceptual model uncertainty and parameter are dominant contributors to the total of a radioecological output. In present study focus is on conceptual uncertainty, which often not acknowledged. assessed by subtracting from output propagated obtained means Bayesian inference analysis. The quantified for two process-based models, describe interception wet deposited pollutants under equilibrium kinetic conditions, respectively. natural variability due chemical valence elements considered...