Claudio Verona

Claudio Verona
University of Rome Tor Vergata | UNIROMA2 · Department of Industrial Engineering

PhD

About

139
Publications
24,002
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,885
Citations

Publications

Publications (139)
Article
Purpose: A diamond detector prototype was recently proposed by Marinelli et al (Medical Physics 2022, https://doi.org/10.1002/mp.15473) for applications in Ultra-High-Dose-Per-Pulse (UH-DPP) and Ultra-High-Dose-Rate (UH-DR) beams, as used in FLASH radiotherapy. In the present study, such so-called flashDiamond (fD) was investigated from the dosime...
Article
Purpose: FLASH radiotherapy (RT) is an emerging technique in which beams with ultra-high dose rates (UH-DR) and dose per pulse (UH-DPP) are used. Commercially available active real-time dosimeters have been shown to be unsuitable in such conditions, due to severe response nonlinearities. In the present study, a novel diamond-based Schottky diode d...
Article
Full-text available
The time-of-flight technique coupled with semiconductor detectors is a powerful instrument to provide real-time characterization of ions accelerated because of laser–matter interactions. Nevertheless, the presence of strong electromagnetic pulses (EMPs) generated during the interactions can severely hinder its employment. For this reason, the diagn...
Preprint
Full-text available
Time-Of-Flight (TOF) technique coupled with semiconductor detectors is a powerful instrument to provide real-time characterization of ions accelerated because of laser-matter interactions. Nevertheless, the presence of strong electromagnetic pulses (EMPs) generated during the interactions, can severely hinder its employment. For this reason, the di...
Preprint
Full-text available
Ion stopping in warm dense matter is a process of fundamental importance for the understanding of the properties of dense plasmas, the realization and the interpretation of experiments involving ion-beam-heated warm dense matter samples, and for inertial confinement fusion research. The theoretical description of the ion stopping power in warm dens...
Poster
Full-text available
In this work we present experimental results on the behavior of diamond at megabar pressure. The experiment was performed using the PHELIX facility at GSI in Germany to launch a planar shock into solid multi-layered diamond samples. The target design allows shock velocity in diamond and in two metal layers to be measured as well as the free surface...
Article
We report on the results achieved by installing two Chemical Vapor Deposition (CVD) single crystal diamond detectors in one of the equatorial ports of the Frascati Tokamak Upgrade (FTU) tokamak, during the last six months of operation of the machine. The devices were fabricated at the University of Rome “Tor Vergata” in a metal/instrinsic/p-type di...
Article
Full-text available
Time-Of-Flight (TOF) methods are very effective to detect particles accelerated in laser-plasma interactions, but they show significant limitations when used in experiments with high energy and intensity lasers, where both high-energy ions and remarkable levels of ElectroMagnetic Pulses (EMPs) in the radiofrequency-microwave range are generated. He...
Article
Full-text available
In this work we present experimental results on the behavior of diamond at megabar pressure. The experiment was performed using the PHELIX facility at GSI in Germany to launch a planar shock into solid multi-layered diamond samples. The target design allows shock velocity in diamond and in two metal layers to be measured as well as the free surface...
Article
Full-text available
The first realizations of S-band hybrid amplifiers based on hydrogenated-diamond (H-diamond) FETs are reported. As test vehicles of the adopted H-diamond technology at microwave frequencies, two designs are proposed: one, oriented to low-noise amplification, the other, oriented to high-power operation. The two amplifying stages are so devised as to...
Article
The aim of this work is to study the catastrophic and gradual degradation of H-terminated diamond MESFETs. Such devices are able to withstand high power densities before failure, but are still affected by a bias-dependent degradation. The main degradation modes are both an increase in ON-resistance and threshold voltage. The effect of this device d...
Article
An improved biological weighting function (IBWF) is proposed to phenomenologically relate microdosimetric lineal energy probability density distributions with the relative biological effectiveness (RBE) for the in vitro clonogenic cell survival (surviving fraction = 10%) of the most commonly used mammalian cell line, i.e. the Chinese hamster lung f...
Article
Full-text available
We report on the cross-calibration of Thomson Parabola (TP) and Time-of-Flight (TOF) detectors as particle diagnostics, implemented on the most recent setup of the ALLS 100 TW laser-driven ion acceleration beamline. The Microchannel Plate (MCP) used for particle detection in the TP spectrometer has been calibrated in intensity on the Tandem linear...
Article
The interaction of an ultra-intense laser with a solid state target allows the production of multi-MeV proton and ion beams. This process is explained by the target normal sheath acceleration (TNSA) model, predicting the creation of an electric field on the target rear side, due to an unbalanced positive charge. This process is related to the emiss...
Conference Paper
In the last decades the development of laser-driven acceleration and inertial fusion fields of research required the commissioning of laser systems with increasing power and repetion rate. This was accompained by a sensible growth of the produced electromagnetic pulses (EMP) inside the experimental chamber and on its surrounding, hindering the empl...
Article
This article reports the first comprehensive analysis of the reliability of hydrogen-terminated diamond metal semiconductor field-effect transistors (MESFETs) submitted to OFF-state stress. We demonstrate that stress induces an increase in ON-resistance and a shift in the threshold voltage, along with a decrease in the transconductance peak value....
Conference Paper
Single crystal diamond detectors are widely employed in laser-induced plasma experiments to retrieve information about particles generated from the interaction. In particular, diamonds are used as Time of Flight (TOF) detectors featured by good sensitivity, high radiation hardness and fast response time. In this work, we provide a detailed characte...
Article
Purpose: To investigate for the first time the performance of a synthetic single crystal diamond detector for the microdosimetric characterization of clinical 62 MeV ocular therapy proton beams. Methods: A novel diamond microdosimeter with a well-defined sensitive volume was fabricated and tested with a monoenergetic and spread-out Bragg peak (S...
Preprint
The interaction of an ultra-intense laser with a solid state target allows the production of multi-MeV proton and ion beams. This process is explained by the TNSA model, predicting the creation of an electric field on the target rear side, due to an unbalanced positive charge. This process is related to the emission of relativistic ul-trafast elect...
Preprint
In the last decades the development of laser-driven acceleration and inertial fusion fields of research required the commissioning of laser systems with increasing power and repetition rate. This was accompanied by a sensible growth of the produced electromagnetic pulses (EMP) inside the experimental chamber and on its surrounding, hindering the em...
Article
Full-text available
The interaction of ultra-intense high-power lasers with solid-state targets has been largely studied for the past 20 years as a future compact proton and ion source. Indeed, the huge potential established on the target surface by the escaping electrons provides accelerating gradients of TV/m. This process, called target normal sheath acceleration,...
Article
Full-text available
The properties of poly(vinyl alcohol) (PVA)-based composites recommend this material as a good candidate for the replacement of damaged cartilage, subchondral bone, meniscus, humeral joint and other orthopedic applications. The manufacturing process can be manipulated to generate the desired biomechanical properties. However, the main shortcomings...
Preprint
The interaction of ultra-intense high power lasers with solid-state targets have been largely studied for twenty years as future compact proton and ion source. Indeed, the huge potential established on the target surface by the escaping electrons provides accelerating gradients of TV/m. This process, called TNSA, involves a large number of phenomen...
Preprint
Time-Of-Flight (TOF) methods are very effective to detect particles accelerated in laser-plasma interactions, but they shows significant limitations when used in experiments with high energy and intensity lasers, where both high-energy ions and remarkable levels of ElectroMagnetic Pulses (EMPs) in the radiofrequency-microwave range are generated. H...
Article
The nuclear reaction known as proton-boron fusion has been triggered by a subnanosecond laser system focused onto a thick boron nitride target at modest laser intensity (∼10 16 W/cm 2), resulting in a record yield of generated α particles. The estimated value of α particles emitted per laser pulse is around 10 11 , thus orders of magnitude higher t...
Article
Purpose: To investigate for the first time the potentialities of obtaining microdosimetric measurements in scanned clinical carbon-ion beams using synthetic single crystal diamond detector and to verify the spectral conversion methods. Methods: Microdosimetric measurements were performed at different depths in a water phantom at the therapeutic...
Presentation
Full-text available
Ion stopping in dense plasmas plays a central role in Inertial Confinement Fusion for the target self-heating by alpha-particles that triggers ignition and thermonuclear gain. The existing experimental database is essentially limited to large projectile velocities (vp >> vth) [1] and validates the perturbative stopping-power models in that range. T...
Article
Full-text available
In this work, we demonstrate the feasibility to obtain aluminium nitride (AlN) nanostructures by radio frequency magnetron sputtering technique. In particular, nanostructured flower-like morphologies are achieved through a direct growth of AlN films on superhard rhodium boride (RhB) layers deposited by means of pulsed laser deposition (PLD) techniq...
Article
An innovative monolithic diamond based ΔE-E charged particle telescope was fabricated in a layered structure featuring an ultrathin ΔE stage coupled to an E stage, about 2μm and 500μm in thickness, respectively. The diamond telescope was characterized in coincidence mode using α-particles emitted by a ²⁴¹Am source, whose energy can be reduced by tr...
Article
Full-text available
Laser–plasma interactions have been studied in detail over the past twenty years, as they show great potential for the next generation of particle accelerators. The interaction between an ultra-intense laser and a solid-state target produces a huge amount of particles: electrons and photons (X-rays and gamma-rays) at early stages of the process, wi...
Preprint
Full-text available
Laser-plasma interactions have been extremely studied in the last twenty years, showing great potentialities for the next generation of particle accelerators. The interaction between an ultra-intense laser and a solid state target produces a huge amount of particles: electrons and photons (x-rays and γ-rays) at early stages of the process, protons...
Poster
Full-text available
Time-of-flight (TOF) measurements are a powerful and effective method to obtain timely spectra of particles accelerated via laser-plasma interaction experiments. However, the intense interactions achieved in high power laser facilities usually generate strong Electromagnetic Pulses (EMPs), which remarkably affect the signal-to-noise ratio of electr...
Article
Microdosemeters are frequently used today to specify the radiation quality in the framework of ion-beam therapy. The heterogeneity of the detector shapes and the materials limits the possibility of comparing directly spectra and mean lineal energies. A method was recently studied to convert the spectra obtained with unidirectional ion beams in slab...
Presentation
Full-text available
Ion stopping in dense plasmas plays a central role in Inertial Confinement Fusion (ICF) for the target self-heating by alpha-particles that triggers ignition and thermonuclear gain. It is crucial for target heating schemes using ion beams as main drivers like heavy-ion fusion or ion-driven fast ignition. Ion stopping in plasmas is also essential in...
Article
The effectiveness and long-term stability of surface transfer doping of H-terminated diamond induced by a very thin V2O5/Al2O3double layer were deeply investigated. Experimental results demonstrate that the deposition of a 5 nm Al2O3layer does not alter the transfer doping properties of the V2O5/H-terminated diamond interface and remarkably improve...
Article
In this work, we describe the results of experiments performed at the femtosecond ECLIPSE laser facility at CELIA in Bordeaux. We irradiated targets constituted by aluminum foils of various thicknesses and characterized the accelerated protons with energies in the range of interest for p+11B nuclear fusion. Time-of-flight measurements were performe...
Article
Purpose: The aim of this paper is to investigate the limits of LET monitoring of therapeutic carbon ion beams with miniaturized microdosimetric detectors. Methods: Four different miniaturized microdosimeters have been used at the 62 MeV/u 12C beam of INFN Southern National Laboratory (LNS) of Catania for this purpose, i.e. a mini-TEPC and a GEM-...
Article
Surface transfer doping of hydrogen-terminated diamond induced by high work function V2O5 oxide was investigated on samples with (100) and (111) surface crystal-orientations. An enhancement of sheet hole density and a decrease in sheet resistance were obtained in the case of (111) diamond as compared to (100). In particular, a sheet resistance as l...
Article
Experimental measurements are presented, devoted to the cross-comparison of two small-size fast neutron detection devices, namely Single-Crystal Diamond diode (SCDD) and Silicon Photodiode (SiPD). Neutron time-of-flight spectra are simultaneously recorded under the same experimental conditions, using an array composed of two SCDDs and two SiPDs pla...
Article
In this work, the fabrication and characterization of a microdosimeter based on a synthetic single crystal diamond is reported. The microdosimeter is realized by means of both standard photolithography and selective chemical vapor deposition techniques to accurately define its micrometric sensitive volume. Experimental measurements were carried out...
Article
Full-text available
We present an analysis of strong laser-driven electromagnetic pulses using novel electro-optic diagnostic techniques. A range of targets were considered, including thin plastic foils (20-550 nm) and mass-limited, optically-levitated micro-targets. Results from foils indicate a dependence of EMP on target thickness, with larger peak electric fields...
Article
A transient lateral photovoltaic effect (LPE) is reported for a metal-semiconductor structure of synthetic single crystal diamond (SCD). A SCD Schottky photodiode was specifically designed to measure a LPE under collimated irradiation from a tunable pulsed laser. A transient lateral photovoltage parallel to the Schottky junction was indeed detected...
Article
Full-text available
The 2014–2016 JET results are reviewed in the light of their significance for optimising the ITER research plan for the active and non-active operation. More than 60 h of plasma operation with ITER first wall materials successfully took place since its installation in 2011. New multi-machine scaling of the type I-ELM divertor energy flux density to...
Article
Diamond is a promising platform for the development of technological applications in quantum optics and photonics. The quest for color centers with optimal photo-physical properties has led in recent years to the search for novel impurity-related defects in this material. Here, we report on a systematic investigation of the photo-physical propertie...
Article
A systematic study of the PTW microDiamond (MD) output factors (OF) is reported, aimed at clarifying its response in small fields and investigating its suitability for small field reference dosimetry. Ten MDs were calibrated under ⁶⁰Co irradiation. OF measurements were performed in 6 MV photon beams by a CyberKnife M6, a Varian DHX and an Elekta Sy...
Article
Protons at energies up to a few hundreds of keV have been accelerated, by irradiating thin Al foils with an intense, fs laser pulses. The produced energetic protons, directed on a massive natural Boron sample, induced (p + ¹¹B) fusion reactions accompanied by alpha particles emission, detected by a CR39 plate.
Article
An innovative diamond detector layout is presented that is designed to operate at high temperature under intense neutron and gamma fluxes. It is made of a 500 μm “electronic grade” diamond film with 100nm thick Ag metal contacts deposited onto each surface of the film by means of thermal evaporation. A 2 μm thick layer of 6LiF has been deposited on...
Article
The paper reports about the use of single-crystal Chemical Vapour Deposited (CVD) diamonds as radiation detectors in laser-matter interaction experiments on the ABC laser in ENEA – Frascati. The detectors have been designed and realized by University of Tor Vergata – Rome. The interdigital configuration and the new design of the bias-tee voltage su...
Article
Diamond has long been considered as a suitable material for the fabrication of radiation detectors due to its outstanding physical properties. Even more so in the specific case of radiation therapy dosimetry applications, where the near-tissue equivalence radiation absorption, good spatial resolution and radiation hardness are required. Recently, a...
Article
We report for the first time on the dc and RF performance of novel MISFETs fabricated on hydrogen-terminated (H-terminated) single crystal diamond film using vanadium pentoxide (V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="...
Article
Field effect transistors (FETs) fabricated on hydrogen-terminated diamond surface have been heavily irradiated with 14.8 MeV neutrons in order to evaluate their possible application in very high neutron fluence environments. The DC performance of the diamond-based FETs, such as drain saturation current and maximum transconductance, has been studied...
Article
Purpose:Small field output correction factors have been studied by several research groups for the PTW 60019 microDiamond (MD) dosimeter, by comparing the response of such a device with both reference dosimeters and Monte Carlo simulations. A general good agreement is observed for field sizes down to about 1 cm. However, evident inconsistencies can...
Article
Full-text available
We describe the first electro-optical absolute measurements of electromagnetic pulses (EMPs) generated by laser-plasma interaction in nanosecond regime. Laser intensities are inertial-confinement-fusion (ICF) relevant and wavelength is 1054 nm. These are the first direct EMP amplitude measurements with the detector rather close and in direct view o...
Article
We report on a comparative study of transfer doping of hydrogenated single crystal diamond surface by insulators featured by high electron affinity, such as Nb2O5, WO3, V2O5, and MoO3. The low electron affinity Al2O3 was also investigated for comparison. Hole transport properties were evaluated in the passivated hydrogenated diamond films by Hall e...
Article
In the present paper, the performances of single crystal diamond detectors "ad hoc" designed to operate at high temperature are reported. The detectors were realized using commercial CVD single crystal diamond films, 500 micron thick with metal contacts deposited by sputtering method on each side. The new detector layout is based upon mechanical co...
Article
Surface transfer doping of hydrogen-terminated diamond has been achieved utilising V2O5 as a surface electron accepting material. Contact between the oxide and diamond surface promotes the transfer of electrons from the diamond into the V2O5 as revealed by the synchrotron-based high resolution photoemission spectroscopy. Electrical characterization...
Article
Full-text available
Diamond detectors are very promising candidates for plasma diagnostics in a harsh environment. In fact, they have several proprieties which make them suitable for magnetic fusion devices: radiation hardness, high thermal conductivity, high resistivity, high carrier mobility and a large bandgap (5.5 eV). The latter makes them insensitive to visible...
Book
Full-text available
Papers presented at the 2nd Bilateral Indo-Italian Workshop NEEM 2015 Rome, Italy October 12-14, 2015 Organized with the support of the Directorate General for the Country Promotion Ministry of Foreign Affairs and International Cooperation by Consorzio Hypatia Department of Science & Technology of India IMEM-CNR Institute for Plasma Research (Ghand...
Article
In this work, a detailed analysis of the properties of a novel microdosimeter based on a synthetic single crystal diamond is reported. Focused ion microbeams were used to investigate the device spectropscopic properties as well as the induced radiation damage effects. A diamond based Schottky diode was fabricated by chemical vapor deposition with a...
Article
Ion-beam therapy faces a growing demand of tools able to map radiation quality within the irradiated volume. Although analytical computations and simulations provide useful estimations of dose and radiation quality, the direct measure of those parameters would improve ion-beam therapy in particular when deep-seated tumours are irradiated, tissue co...