L. Giacomelli
A5005203976- Magnetic confinement fusion research
- Nuclear Physics and Applications
- Fusion materials and technologies
- Nuclear reactor physics and engineering
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Ionosphere and magnetosphere dynamics
- Diamond and Carbon-based Materials Research
- Laser-Plasma Interactions and Diagnostics
- Particle Detector Development and Performance
- Radiation Effects in Electronics
- Medicinal Plants and Neuroprotection
- Solar and Space Plasma Dynamics
- Plasma Diagnostics and Applications
- Nuclear physics research studies
- Power Line Communications and Noise
- Radiation Therapy and Dosimetry
- Astro and Planetary Science
- Network Traffic and Congestion Control
- Advanced Data Storage Technologies
- Laser-induced spectroscopy and plasma
- Ion-surface interactions and analysis
- X-ray Spectroscopy and Fluorescence Analysis
National Agency for New Technologies, Energy and Sustainable Economic Development
2021-2025
Institute for the Science and Technology of Plasmas
2019-2024
University of Milano-Bicocca
2007-2023
University of Urbino
2023
Joint Research Centre
2022-2023
National Academies of Sciences, Engineering, and Medicine
2015-2023
National Research Council
2019-2022
Institute of Plasma Physics
2007-2021
University of Padua
2021
Polis
2020-2021
The plasma diagnostic and control (D&C) system for a future tokamak demonstration fusion reactor (DEMO) will have to provide reliable operation near technical physics limits, while its front-end components be subject strong adverse effects within the nuclear high temperature environment. ongoing developments ITER D&C represent an important starting point progressing towards DEMO. Requirements detailed exploration of are however pushing design using sophisticated methods aiming large spatial...
Presented here is the design of Mechanical Ventilator Milano (MVM), a novel mechanical ventilator designed for rapid mass production in response to COVID-19 pandemic address urgent shortage intensive therapy ventilators many countries, and growing difficulty procuring these devices through normal supply chains across borders. This an electro-mechanical equivalent old reliable Manley Ventilator, able operate both pressure-controlled pressure-supported ventilation modes. MVM optimized...
Abstract The JET hybrid scenario has been developed from low plasma current carbon wall discharges to the record-breaking Deuterium-Tritium plasmas obtained in 2021 with ITER-like Be/W wall. development started pure Deuterium refinement of current, and toroidal magnetic field choices succeeded solving heat load challenges arising 37 MW injected power ITER like environment, keeping radiation edge core controlled, avoiding MHD instabilities reaching high neutron rates. have re-run Tritium...
Disruptions are a major operational concern for next generation tokamaks, including ITER.They may generate excessive heat loads on plasma facing components, large electromagnetic forces in the machine structures and several MA of multi-MeV runaway electrons.A more complete understanding processes methods to suppress them is necessary ensure safe reliable operation future tokamaks.Runaway electrons were studied at JET-ILW showing that their dependencies (accelerating electric field, avalanche...
First simultaneous measurements of deuterium-deuterium (DD) and deuterium-tritium neutrons from deuterium plasmas using a Single crystal Diamond Detector are presented in this paper. The were performed at JET with dedicated electronic chain that combined high count rate capabilities energy resolution. deposited spectrum DD was successfully reproduced by means Monte Carlo calculations the detector response function simulations neutron emission plasma, including background contributions....
This paper summarizes the physical principles behind novel three-ion scenarios using radio frequency waves in ion cyclotron range of frequencies (ICRF). We discuss how to transform mode conversion electron heating into a new flexible ICRF technique for and fast-ion generation multi-ion species plasmas. The theoretical section provides practical recipes selecting plasma composition realize scenarios, including two equivalent possibilities choice resonant absorbers that have been identified....
An initial concept for the plasma diagnostic and control (D&C) system has been developed as part of European studies towards development a demonstration tokamak fusion reactor (DEMO). The main objective is to develop feasible, integrated design DEMO D&C that can provide reliable high performance (electricity output) over extended periods operation. While power maximized when operating near operational limits tokamak, reliability operation typically improves choosing parameters significantly...
At present, magnetic confinement fusion devices rely solely on absolute neutron counting as a direct way of measuring power. Absolute deuterium-tritium gamma rays could provide the secondary neutron-independent technique required for validation scientific results and licensing tool future power plants. However, this approach necessitates an accurate determination gamma-ray-to-neutron branching ratio. The ratio reaction ^{3}H(^{2}H,γ)^{5}He/^{3}H(^{2}H,n)^{4}He was determined in plasmas at...
Observations made in a JET experiment aimed at accelerating deuterons to the MeV range by third harmonic radiofrequency (RF) heating coupled into deuterium beam are reported.Measurements based on set of advanced neutron and gamma-ray spectrometers that, for first time, observe plasma simultaneously along vertical oblique lines sight.Parameters fast ion energy distribution, such as high cut-off deuteron distribution function RF coupling constant, determined from data within uniform analysis...
Single crystal Diamond Detectors (SDD) are being increasingly exploited for neutron diagnostics in high power fusion devices, given their significant radiation hardness and energy resolution capabilities. The geometrical efficiency of SDDs is limited by the size commercially available crystals, which often smaller than dimension beams along collimated lines sight tokamak devices. In this work, we present design fabrication a 14 MeV spectrometer consisting 12 diamond pixels arranged matrix,...
We here present the principles and main physics capabilities behind design of radial gamma ray spectrometers (RGRS) system for alpha particle runaway electron measurements at ITER. The diagnostic benefits from recent advances in gamma-ray spectrometry tokamak plasmas combines space high energy resolution a single device. RGRS as designed can provide information on particles time scale 1/10 slowing down ITER 500 MW full power DT scenario. Spectral observations 3.21 4.44 MeV peaks reaction...
Dedicated experiments to generate energetic D ions and fusion-born alpha particles were performed at the Joint European Torus (JET) with ITER-like wall (ILW). Using 3-ion radio frequency (RF) heating scenario, deuterium from neutral beam injection (NBI) accelerated in core of mixed plasmas higher energies ion cyclotron resonance (ICRF) waves, turn leading a core-localized source particles. The fast-ion distribution RF-accelerated D-NBI was controlled by varying ICRF NBI power ( 4–6 MW, 3–20...
Exercise-released extracellular vesicles (EVs) are emerging as a novel class of exerkines that promotes systemic beneficial effects. However, slight differences in the applied exercise protocols terms mode, intensity and duration, well need for standardized EV isolation, make comparison studies literature extremely difficult. This work aims to investigate amount EV-associated miRNAs released circulation response different physical regimens. Healthy individuals were subjected protocols: acute...
The energy spectrum of the neutron emission from beam–target reactions in fusion plasmas at Joint European Torus (JET) has been investigated. Different beam energies as well injection angles were used. Both measurements and simulations done. made with time-of-flight spectrometer TOFOR. Simulations based on first-principle calculations neutral deposition profiles fast ion slowing down plasma using code NUBEAM, which is a module TRANSP package. shape was seen to vary significantly depending...
A prototype Single crystal Diamond Detector (SDD) was installed at the Joint European Torus (JET) in 2013 along an oblique line of sight and demonstrated possibility to carry out neutron spectroscopy measurements with good energy resolution detector stability discharges heated by neutral beam injection radio-frequency waves. Starting from these positive results, within Vertical Neutron Spectrometer project Torus, we have developed a pixelated instrument consisting matrix 12 independent SDDs,...
An accurate calibration of the JET neutron diagnostics with a 14 MeV generator was performed in first half 2017 order to provide reliable measurement fusion power during next deuterium–tritium (DT) campaign. In meet target accuracy, chosen has been fully characterized at Neutron Metrology Laboratory National Physical (NPL), Teddington, United Kingdom. The present paper describes measurements energy spectra obtained using high-resolution single-crystal diamond detector (SCD). measurements,...
Disruption-generated runaway electron (RE) beams represent a severe threat for tokamak plasma-facing components in high current devices like ITER, thus motivating the search of mitigation techniques. The application 3D fields might aid this purpose and recently was investigated also ASDEX Upgrade experiment by using internal active saddle coils (termed B-coils). Resonant magnetic perturbations (RMPs) with dominant toroidal mode number n = 1 have been applied B-coils, RE specific scenario,...
In DT plasmas, toroidal Alfvén eigenmodes (TAEs) can be made unstable by the alpha particles resulting from fusion reactions, and may induce a significant redistribution of fast ions. Recent experiments have been conducted in JET deuterium plasmas order to prepare scenarios aimed at observing alpha-driven TAEs future campaign. Discharges low density, large core temperatures associated with presence internal transport barriers characterised good energetic ion confinement performed. ICRH has...
Dedicated experiments were conducted in mixed H-D plasmas JET to demonstrate the efficiency of 3-ion ICRF scheme for plasma heating, relying on injected fast NBI ions as resonant ion species.Strong core localization RF power deposition close vicinity ion-ion hybrid layer was achieved, resulting an efficient generation energetic D ions, strong enhancement neutron rate and observation Alfvénic modes.A consistent physical picture that emerged from a range fast-ion measurements at JET, including...
Abstract Runaway electrons (REs) created during tokamak disruptions pose a threat to the reliable operation of future larger machines. Experiments using shattered pellet injection (SPI) have been carried out at JET investigate ways prevent their generation or suppress them if avoidance is not sufficient. Avoidance possible SPI contains sufficiently low fraction high-Z material, it fired early in advance disruption prone runaway generation. These results are consistent with previous similar...
Abstract The Joint European Torus (JET) has recently conducted its second deuterium–tritium (DT) experimental campaign DTE2, providing unique opportunity for studying both physics and engineering aspects of nuclear fusion plasmas. This also allowed the exploitation new diagnostics technologies that were not available during first JET DT held in 1997. Among these instruments, enhancement projects lead to development installation synthetic single crystal diamond detectors along different...