Author
A. Rigoni
Bio: A. Rigoni is an academic researcher from University of Padua. The author has contributed to research in topics: Muon tomography & Nuclear engineering. The author has an hindex of 6, co-authored 21 publications receiving 118 citations.
Papers
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TL;DR: The present paper gives an account of the status of the procurements, of the timeline, and of the voltage holding tests and experiments for MITICA, the full-scale prototype of the entire injector, devoted to the issues related to the accelerator, including voltage holding at low gas pressure.
Abstract: The requirements of ITER neutral beam injectors (1 MeV, 40 A negative deuterium ion current for 1 h) have never been simultaneously attained; therefore, a dedicated Neutral Beam Test Facility (NBTF) was set up at Consorzio RFX (Padova, Italy). The NBTF includes two experiments: SPIDER (Source for the Production of Ions of Deuterium Extracted from Rf plasma), the full-scale prototype of the source of ITER injectors, with a 100 keV accelerator, to investigate and optimize the properties of the ion source; and MITICA, the full-scale prototype of the entire injector, devoted to the issues related to the accelerator, including voltage holding at low gas pressure. The present paper gives an account of the status of the procurements, of the timeline, and of the voltage holding tests and experiments for MITICA. As for SPIDER, the first year of operation is described, regarding the solution of some issues connected with the radiofrequency power, the source operation, and the characterization of the first negative ion beam.
57 citations
40 citations
TL;DR: In this article, the authors demonstrate that muon tomography can be used to precisely measure the properties of various materials, which have been extracted from an experimental blast fur and used to measure properties of different materials.
Abstract: We demonstrate that muon tomography can be used to precisely measure the properties of various materials. The materials which have been considered have been extracted from an experimental blast fur ...
17 citations
23 Jun 2013
TL;DR: In this article, the results about simulation studies of a muon tomography portal are reported. But they are based on a large volume demonstrator built using spare muon drift-time chambers of the CMS high energy physics experiment operating at the Large Hadron Collider at CERN.
Abstract: The accidental melting of radioactive sources hidden inside metal scrap containers can produce severe environmental harm. Modern melting facilities are equipped with portals measuring radiation levels. Nonetheless, sources can pass undiscovered when shielded inside shells of high density material, such as lead. From time to time indeed some radioactive sources pass undetected through the controls at foundries entrance. Once melted they caused enormous damages to the steel mills, contaminating all the production line. The muon tomography technique allows to discriminate high- Z materials measuring multiple scattering of cosmic ray muons inside matter. Therefore this technique can be used to analyze a truck container searching for high-density source shields. We report here the results about simulation studies of a muon tomography portal. Within the Mu-Steel European project we developed the prototype design, the three-dimensional images reconstruction software and the high density material identification algorithm. MonteCarlo simulation was validated with data from a large volume demonstrator (~11 m3) built using spare muon drift-time chambers of the CMS high energy physics experiment operating at the Large Hadron Collider at CERN.
13 citations
TL;DR: The whole system making up the magnetic diagnostics is described, following the acquisition chain from the probe to the streamed data and illustrating the requirements and conflicting limitations which affect the different components, in order to provide a comprehensive overview useful for an integrated design of any new systems.
Abstract: Inductive measurement of magnetic fields is a diagnostic technique widely used in several scientific fields, such as magnetically confined fusion, plasma thrusters and particle accelerators, where real time control and detailed characterization of physics phenomena are required. The accuracy of the measured data strongly influences the machine controllability and the scientific results. In the framework of the assembly modifications of the RFX-mod experiment, a complete renew and improvement of the magnetic diagnostic system, from the probes moved inside the vacuum vessel to the integrator modules, has been carried out. In this paper, the whole system making up the magnetic diagnostics is described, following the acquisition chain from the probe to the streamed data and illustrating the requirements and conflicting limitations which affect the different components, in order to provide a comprehensive overview useful for an integrated design of any new systems. The characterization of a prototypical implementation of the whole acquisition chain is presented, focusing on the flexible ADC architecture adopted for providing a purely numerical signal integration, highlighting the advantages that this technology offers in terms of flexibility, compactness and cost effectiveness, along with the limitations found in existing implementation in terms of ADC noise characteristics and their possible solutions.
8 citations
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TL;DR: In this article, the authors reviewed the research on the Reversed Field Pinch in the last three decades and concluded that substantial experimental and theoretical progress and transformational changes have been achieved since the last review.
Abstract: This paper reviews the research on the Reversed Field Pinch in the last three decades. Substantial experimental and theoretical progress and transformational changes have been achieved since the last review (Bodin, 1990). The experiments have been performed in devices with different sizes and capabilities. The largest one are RFX-mod in Padova (Italy) and MST in Madison (US). The experimental community includes also EXTRAP-T2R in Sweden, RELAX in Japan and KTX in China. Impressive improvements in the performance are the result of exploration of two lines: the high current operation with the spontaneous occurrence of helical equilibria with good magnetic flux surfaces and the active control of the current profile. A crucial ingredient for the advancements obtained in the experiments has been the development of state-of-art active feedback control systems allowing the control of MHD instabilities in presence of a thin shell. Contributions of the RFP line to the fusion grand challenge will be reported. The balance between achievements and still open issues leads us to the conclusion the RFP can be a valuable and diverse contributor in the quest for fusion electricity.
61 citations
TL;DR: In this article , the caesium conditioning procedure and the corresponding beam performances during the first operation of SPIDER with caesIUM were described. But the results obtained in this first investigation provided key indications on the operation of the largest existing sources of accelerated negative hydrogen-like ions.
Abstract: The negative-ion based neutral beam injector for heating and current drive of the ITER plasma (ITER HNB) is under development, at present focusing on the optimization of the full-scale plasma source in the SPIDER test stand. The production of H− or D− ions in the ion source is based on the low work function surfaces obtained by caesium evaporation. This paper describes the caesium conditioning procedure and the corresponding beam performances during the first operation of SPIDER with caesium. Technical solutions to overcome present limitations of the test stand are described. The influence of source parameters on the caesium effectiveness was investigated in short beam pulse operation; with total radio-frequency (RF) power of 400 kW and filling pressure below 0.4 Pa, and a limited number of extraction apertures, a negative ion current density of about 200 A m−2 was extracted in hydrogen, with beam energy lower than 60 keV. Beam optics and beam uniformity were assessed thanks to the acceleration of isolated ion beamlets. A possible procedure to accelerate a uniform beam was demonstrated at low RF power. The results obtained in this first investigation provided key indications on the operation of one of the largest existing sources of accelerated negative hydrogen-like ions.
49 citations
TL;DR: In this article, the authors describe the main results of the first two years of SPIDER operation, including investigation of RF-plasma coupling efficiency and magnetic filter field effectiveness in reducing co-extracted electrons.
49 citations
01 Jan 2006
TL;DR: Cosmic Ray Variations of Atmospheric Origin: The theory and methods of determining the origin of cosmic ray variations of atmospheric origin are described in detail in this paper, and the application of the Inverse Problem for the determination of Atmospheric Conditions by Data on Cosmic Ray Meteorological Effects.
Abstract: -Preface. Acknowledgments. Frequently used Abbreviations and Notations. -Part 1: Cosmic Rays As An Object Of Research And As A Research Instrument. Preface to Part 1. 1. Cosmic Rays as an Object of Research. 2. Secondary CR Underground and in the Atmosphere. 3. Coupling Functions, Integral Multiplicities, and Inverse Transformations. 4. Experimental Basis of Cosmic Ray Research. -Part 2: Influence Of The Changing Atmosphere On Cosmic Rays (Meteorological Effects). Preface to Part 2. 5. Theory of Cosmic Ray Meteorological Effects for Measurements in the Atmosphere and Underground (One-Dimensional Approximation). 6. Experimental Investigations of Cosmic Ray Snow, Wind and Barometric Effects. 7. Experimental Investigations of Cosmic Ray Temperature and Humidity Effects. 8. Atmospheric Electric Field Effects in Cosmic Rays. 9. Development of the Theory and Methods of Determination of Cosmic Ray Variations of Atmospheric Origin. -Part 3: Cosmic Ray Influence On The Atmosphere And Atmospheric Processes. Preface to Part 3. 10. Nuclear Reactions of Cosmic Rays with Ground, Water, and Air Atoms Production of Cosmogenic Nuclides. 11. Cosmic Ray Influence on Atmospheric Electric Field and Thunderstorms, Global Earth's Charge and Global Electric Current. 12. Air Ionization by CR, Influence on the Ionosphere and Radio Wave Propagation. 13. Cosmic Ray Influence on the Chemical Processes in the Atmosphere and Formation of Ozone Layer. 14. Cosmic Ray Influence on Planetary Cloud-Covering and Long-Term Climate Change. -Part 4: Applications Of Cosmic Ray Research. Preface to Part 4. 15. The Application of the Inverse Problem: Determination of Atmospheric Conditions by Data on Cosmic Ray Meteorological Effects. 16. Meteorological Effects Application to Cosmic Ray Latitude Survey Data Processing. 17. Applications of the Radiocarbon Coupling Function Method to Investigations of Planetary Mixing and Exchange Processes Influence of H-Bomb Explosions on the Environment Cosmic Ray Variations in the Past. 18. Potential and Realized Applications of Cosmic Ray Research in Science and Technology. -Conclusion and Problems.
37 citations
TL;DR: In this paper, a review of the applications of cosmic-ray muons is presented along with a list of past and present applications in three main categories: muon radiography, muon tomography and muon metrology.
36 citations