P. Platania
A5027014694- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Galaxies: Formation, Evolution, Phenomena
- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Gyrotron and Vacuum Electronics Research
- Cosmology and Gravitation Theories
- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
- Fusion materials and technologies
- Scientific Research and Discoveries
- Superconducting and THz Device Technology
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Dark Matter and Cosmic Phenomena
- Nuclear reactor physics and engineering
- Astronomical Observations and Instrumentation
- Calibration and Measurement Techniques
- Advanced Thermodynamic Systems and Engines
- Plasma Diagnostics and Applications
- Particle Accelerators and Free-Electron Lasers
- Ionosphere and magnetosphere dynamics
- Relativity and Gravitational Theory
- Microwave Engineering and Waveguides
Institute for the Science and Technology of Plasmas
2020-2024
National Research Council
2021-2024
Institute of Plasma Physics
2006-2019
Karlsruhe Institute of Technology
2013
National Agency for New Technologies, Energy and Sustainable Economic Development
2007-2012
European Space Research Institute
2012
Agenzia Spaziale Italiana
2012
Aalto University
2012
Culham Science Centre
2011
École Polytechnique Fédérale de Lausanne
2008-2009
In this paper we present the Low Frequency Instrument (LFI), designed and developed as part of Planck space mission, ESA program dedicated to precision imaging cosmic microwave background (CMB). Planck-LFI will observe full sky in intensity polarisation three frequency bands centred at 30, 44 70 GHz, while higher frequencies (100-850 GHz) be covered by HFI instrument. The LFI is an array radiometers based on state-of-the-art Indium Phosphide cryogenic HEMT amplifiers implemented a...
The ITER electron cyclotron (EC) upper port antenna (or launcher) is nearing completion of the detailed design stage and final build-to-print will soon start. main objective this launcher to drive current locally stabilize neoclassical tearing modes (NTMs) (depositing ECCD inside island that forms on either q = 3/2 or 2 rational magnetic flux surfaces) control sawtooth instability (deposit near 1 surface). should be capable steering focused beam deposition location resonant surface over...
We present an analysis of simultaneous multifrequency measurements the Galactic emission in 1-10 GHz range with 18° angular resolution taken from a high-altitude site. Our data yield determination synchrotron spectral index between 1.4 and 7.5 βsyn = 2.81 ± 0.16. Combining our maps made by Haslam et al. Reich & Reich, we find 2.76 0.11 0.4-7.5 range. These results are agreement few previously published measurements. The variation frequency based on compared other found literature suggests...
By collecting the information from 24 previously published lists and catalogs, we produce a comprehensive catalog (Master Catalog) of 1442 Galactic HII regions. For each object, quote original fluxes diameters as well available on radio line velocities, widths temperatures errors these quantitities. References to works are also reported. exploiting all data Synthetic Catalog (with corresponding errors) at 2.7 GHz. This choice is motivated by extensive, although not complete, this frequency,...
A detailed knowledge of the Galactic radio continuum is high interest for studies dynamics and structure Galaxy as well problem foreground removal in Cosmic Microwave Background measurements. In this work we present a full-sky study diffuse emission at frequencies few GHz, where synchrotron radiation by far dominant component. We perform combined analysis extended surveys 408, 1420 2326 MHz (by Haslam et al. 1982, Reich & Reich, 1986 Jonas 1998, respectively). Using technique applied...
The Divertor Tokamak Test (DTT) facility is being realised in Frascati, Italy for the study of power exhaust issues view DEMO tokamak. A multi-MW Electron Cyclotron Resonance Heating (ECRH) system foreseen with a first set 16 gyrotrons at 1 MW and 170 GHz available stage operation; additional from to 1.2 are later total up 33.6 ECRH plasma. itself part 45 external heating coupled plasma, provided also by Ion Neutral Beam Injection. Transmission Line (TL) fully quasi-optical, between 84 m 138...
Abstract The European DEMO (EU-DEMO) reactor studies within EUROfusion aim to develop a fusion power plant concept. large tokamak device needs an auxiliary heating which, at the present stage, is provided by Electron Cyclotron (EC) system with up 130 MW foreseen reach different regions of plasma for heating, suppression instabilities and possibility support ramp-up ramp-down phases. conceptual design based on 2 coaxial-cavity gyrotron sources, transmission line (TL) using both circular...
We give the calibration and scientific performance parameters of Planck Low Frequency Instrument (LFI) measured during ground cryogenic test campaign. These characterise instrument response constitute our best pre-launch knowledge LFI performance. The shows excellent $1/f$ stability rejection instrumental systematic effects; noise that is most sensitive its kind. set will be updated flight operations through end mission.
Lower hybrid current drive (LHCD) experiments performed at a density close to that required for the steady-state (SS) scenario are reported. On C-Mod, FTU and Tore Supra, strong decay of bremsstrahlung emission is observed when increased, much faster prediction LHCD modelling. JET, LH power deposition also found be sensitive plasma density: modulation indicates moves very edge (r/a ∼ 0.9) approaches requirement JET SS scenario. From this experiment but from reconstruction electron cyclotron...
The Italian tokamak DTT (Divertor Tokamak Test) is a facility for research on nuclear fusion with the aim of investigating alternative power exhaust solutions to be exploited in future DEMO plant. foresees three additional heating systems provide plasma sufficient power: Electron Cyclotron Heating (ECH) main one, up 32 MW installed. It consists 4 clusters, each one composed eight radio-frequency sources (gyrotrons) their single-beam transmission lines, quasi-optical Multi-Beam Transmission...
To achieve efficient power transfer, the Divertor Tokamak Test (DTT) facility relies on supplementary heating systems. One of them is Electron Cyclotron Heating (ECH). ECH employs 4 clusters, each comprising 8 gyrotrons as Radio Frequency (RF) sources, 1 quasi-optical Multi-Beam Transmission Line (MBTL), and independent launchers. The generated RF (170 GHz, MW, 100 s) delivered to plasma through oversized flat focusing mirrors. However, MBTL faces challenges during operation microwave beams...
The JT-60SA tokamak, being built under the Broader Approach agreement jointly by Europe and Japan, is due to start operation in 2020 expected give substantial contributions both ITER DEMO scenario optimisation. A broad set of preparation activities for an efficient experiments on carried out, involving elaboration Research Plan, advanced modelling various domains, feasibility conception studies diagnostics other sub-systems connection with priorities scientific programme, development...
JT-60SA, the largest tokamak that will operate before ITER, has been designed and built jointly by Japan Europe, is due to start operation in 2020.Its main missions are support ITER exploitation contribute demonstration fusion reactor machine scenario design.Peculiar properties of JT-60SA its capability produce long-pulse, high-β, highly shaped plasmas.The preparation Research Plan, plasma scenarios, producing physics results not only relevant future experiments, but often constitute...
The Divertor Tokamak Test (DTT) facility, whose construction has started in Frascati (Italy), will be equipped with an ECRH (electron cyclotron resonance heating) system including 32 gyrotrons as microwave power sources. procurement of the first batch sources 16 MW total power, based on 170 GHz/≥ 1 MW/100 s vacuum tubes, is progress and available for DTT plasma. organized into four clusters 8 each. transmitted from Gyrotron Hall to Torus Building (THB) by a quasioptical transmission line...
We describe the optical design and optimisation of Low Frequency Instrument (LFI), one two instruments onboard <i>Planck<i/> satellite, which will survey cosmic microwave background with unprecedented accuracy. The LFI covers 30–70 GHz frequency range an array cryogenic radiometers. Stringent requirements on angular resolution, sidelobes, main beam symmetry, polarization purity, feed orientation have been achieved. process was carried out by assuming ideal telescope according to using both...
Quasar-driven winds are currently the best candidates for accounting pre-heating of intergalactic medium in clusters. Such winds, occurring during early phases evolution spheroidal galaxies, shock-heat interstellar gas, thus inducing a detectable Sunyaev-Zeldovich effect. We estimate amplitude and angular scale such effect as well its counts function comptonization parameter $y$. The contamination due to radio emission by quasar itself is also discussed. corresponding mean Compton distortion...
The code SPECE has been developed for the analysis of electron cyclotron emission (ECE) in a general tokamak equilibrium. solves radiation transport equation along ray trajectories plasma, which magnetic equilibrium and plasma profiles are given either analytically or numerically, Maxwellian non thermal characterized by distribution function that is sum drifting distributions. Ray computed making use cold dispersion relation, while absorption coefficients obtained solving relevant fully...
Abstract A large superconducting machine, JT-60SA has been constructed to provide major contributions the ITER program and DEMO design. For success of project fusion reactor, understanding development plasma controllability in relevant higher beta regimes are essential. focused on for scenario risk mitigation as well investigating regimes. This paper summarizes high research priorities strategy project. Recent works simulation studies prepare physics control experiments presented, such...
The design of the Transmission Line (TL) as a part Electron Cyclotron Heating (ECH) system for Divertor Tokamak Test facility (DTT) is approaching conceptual maturity. With an ECH 16 MW installed first phase and with total 32 gyrotrons (170 GHz, ≥ 1 MW, 100 s) TL undertaking challenge evacuated Multi-Beam (MBTL) concept to deliver large number beam lines from gyrotron hall torus buildings. organized in 4 clusters, each them including 8 beamlines. routing consists single-beam section used...
The divertor tokamak test (DTT) facility is designed to study the power exhaust methods in scenarios similar those expected future fusion plants like DEMO. project foresees 45 MW of external additional heating plasma, provided by electron cyclotron (ECH), ion heating, and neutral beam injector. This article focuses on present status design transmission lines (TLs) antennas for ECH system. In first operational phase, system shall include 16 gyrotrons (1 MW/170 GHz/100 s), grouped into two...