A5045415004- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Ionosphere and magnetosphere dynamics
- Fusion materials and technologies
- Plasma Diagnostics and Applications
- Semiconductor materials and devices
- Laser-Plasma Interactions and Diagnostics
- Electrostatic Discharge in Electronics
- Advancements in Semiconductor Devices and Circuit Design
- Quantum chaos and dynamical systems
- Laser Design and Applications
- Nuclear reactor physics and engineering
- Radiation Therapy and Dosimetry
- Scientific Research and Discoveries
- Neutrino Physics Research
- Theoretical and Computational Physics
- Virtual Reality Applications and Impacts
- Heart Rate Variability and Autonomic Control
- Nuclear physics research studies
- Silicon and Solar Cell Technologies
- Atomic and Molecular Physics
- Gyrotron and Vacuum Electronics Research
- Solid-state spectroscopy and crystallography
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro
2023-2025
Istituto Nazionale di Fisica Nucleare
2023
University of Padua
2021
National Agency for New Technologies, Energy and Sustainable Economic Development
2011-2013
Physique des interactions ioniques et moléculaires
2011
Centre National de la Recherche Scientifique
2010
This paper presents the design and solutions of chopper for injection line cyclotron SPES project at Laboratori Nazionali di Legnaro. The device aims to precisely modulate average current injected into cyclotron, thereby controlling it delivers. A precise control beam is essential many experiments foreseen cyclotron. Due safety constraints limited space, an innovative has been developed. features a Wien filter configuration, where electric field pulsed magnetic generated by permanent magnets.
This paper presents the requirements and design solutions of chopper for injection line cyclotron SPES project at Laboratori Nazionali di Legnaro. The device aims to precisely modulate average current injected into cyclotron, thereby controlling it delivers. A precise control beam is essential many experiments foreseen cyclotron. Due safety constraints limited space, a tailored has been developed. features Wien filter configuration, where electric field pulsed magnetic generated by permanent magnets.
This paper summarizes the main achievements of RFX fusion science program in period between 2008 and 2010 IAEA Fusion Energy Conferences. RFX-mod is largest reversed field pinch world, equipped with a system 192 coils for active control MHD stability. The discovery understanding helical states electron internal transport barriers core temperature >1.5 keV significantly advances perspectives configuration. Optimized experiments plasma current up to 1.8 MA have been realized, confirming...
The study of electron temperature profiles quasi-single helical states (QSH) in RFX-Mod (and, general, other RFP machines) was carried out the past mainly using Thomson scattering, thus being limited to a time resolution order some milliseconds and collection single, isolated cases, which displayed clear transport barriers. A new multichord double filter SXR spectrometer developed installed. Temperature are now measured up frequency kHz, allowing one determine entire evolution during QSH...
An interesting result of magnetic chaos reduction in RFX-mod high current discharges is the development strong electron transport barriers. internal heat and particle barrier formed when a bifurcation process changes configuration into helical equilibrium follows, together with formation null q shear. Strong temperature gradients develop, corresponding to decreased thermal transport. Turbulence analysis shows that large are limited by onset micro-tearing modes, addition residual chaos. A new...
In the reversed field pinch RFX-mod at highest plasma current of 2 MA, when error fields are not effectively feedback controlled, localized thermal loads up to tens MW m−2 can be produced. The graphite tiles withstand such high power loads, but hydrogen retention makes density control extremely difficult. Several wall conditioning techniques have been optimized in last campaigns, including helium glow discharge cleaning and boronization by diborane discharges. More recently, lithium has...
High current (Ip = 1–1.7 MA) operations in the ohmic reversed field pinch RFX-mod spontaneously access quasi-single helicity (QSH) regime, which magnetic dynamics is dominated by innermost resonant mode (m 1, n −7), chaos level reduced and internal configuration close to a pure helix. During QSH state strong electron temperature (Te) gradients can show up, identifying an transport barrier (Puiatti 2011 Nucl. Fusion 51 073038). Results advancements obtained recent high campaigns are reported...
High current plasmas in the RFX-mod experiment are characterized by a 3D helical magnetic topology where internal electron transport barriers, with temperature up to 1.2 keV, develop core. Power balance and heat analyses have been performed for first time using high resolution Te measurements obtained double filter technique multichords soft-x-ray (SXR) diagnostic. profiles implemented equation order determine thermal diffusivity across surfaces assuming both stationary dynamic conditions....
Over the years, Maxwellian Averaged Cross Sections (MACS) have been measured by neutron activation, providing a energy spectrum resembling one found inside stars. Recently, new method has proposed to produce stellar spectra at different temperatures (a Maxwell–Boltzmann distribution), employing 7Li(p,n)7Be reaction. The is based on idea of shaping proton beam shape spectrum. This was applied obtain well-reproduced (MBNS) kT=28 keV. An initial 3170 keV and an aluminum foil as shaper were...
Radio frequency quadrupole coolers (RFQCs) are very suitable to cool ion beams with moderate energy spread, typically ions of exotic nuclear species (like $^{132}$ Sn $^{1+}$ ) as in the Selective Production Exotic Species project at Laboratori Nazionali di Legnaro, whose source supplies 40 keV ions. Beam dynamics includes ion–gas collisions (with a balance cooling and diffusion effects), acceleration deceleration radiofrequency confinement, which can be supplemented by static magnetic field...
Abstract One of the aim new project Selective Production Exotic Species (SPES) is to produce and select new, neutron reach, isotopes [1,2,3,4]. The technique adopted these species Isotope Selection On Line (ISOL) that postpones separation after beam production, using a High-Resolution Mass Spectrometer (HRMS). In order allow good , transverse emittance energy spread should have very low values, for this reason Beam Cooler (BC) located between ISOL target, i.e. source, HRMS. SPES project,...
Abstract The cooling of secondary beams is important for accelerator-based nuclear physics. In the radiofrequency (RF) quadrupole cooler (RFQC), RF fields and ion-gas collisions may give a considerable increase or decrease beam transverse emittance energy spread, depending on delicate tuning heating effects, dominated by ion kinetic balance confinement forces. An extra be added solenoid magnetic field, as in RFQC prototype installed Eltrap machine. This provides versatile test bench...
Wave‐particle interactions are central in plasma physics. The paradigm beam‐plasma system can be advantageously replaced by a traveling wave tube (TWT) to allow their study much less noisy environment. This led detailed analysis of the self‐consistent interaction between unstable waves and an either cold or warm electron beam. More recently test beam has been used observe its with externally excited wave(s). allowed observing main features Hamiltonian chaos testing new method efficiently...
In order to allow a good separation of isotopes in High Resolution Mass Spectrometer (HRMS), the transverse emittance and energy spread beam should have very low values, for this reason Beam Cooler (BC) is planned be located between ISOL target, i.e. source, HRMS new project Selective Production Exotic Species (SPES). SPES spectrometer resolution must higher than dm/m=5E-5 thus features at entrance least (95%, normalized) < 8.3E-3 pi mm mrad sigma_E 1.5eV. A BC has been designed realized by...
Virtual reality (VR) approaches have recently found promising applications in the field of rehabilitation. However, prolonged immersion a VR environment is known to occasionally cause sickness and discomfort, both patients healthy subjects. In present study we assessed changes Electrodermal Activity (EDA) as an estimate Sympathetic Nervous System (SNS) activity 16 subjects performing 3 different tasks environment. Our aim collect preliminary evidence on use SNS potential marker detect...