F. Orsitto
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View article: Standardizing high electron temperature measurement comparisons: a method for cross-diagnostic and cross-machine analysis
Standardizing high electron temperature measurement comparisons: a method for cross-diagnostic and cross-machine analysis Open
In tokamaks, measuring electron temperatures in the plasma core may be quite challenging, especially when they exceed 6–8 keV [1]. Discrepancies are detected between the values measured by different diagnostics, such as Thomson Scattering …
View article: The Thomson Scattering System for DTT (Divertor Test Tokamak) edge-pedestal
The Thomson Scattering System for DTT (Divertor Test Tokamak) edge-pedestal Open
The preliminary design of the Thomson Scattering (TS) System devoted to the measurement of the electron density and temperature in the edge-pedestal region of DTT (Divertor Tokamak Test) is described. The evaluation of the DTT pedestal wid…
View article: A Neutron Source Based on Spherical Tokamak
A Neutron Source Based on Spherical Tokamak Open
The paper presents a conceptual study of a neutron source based on a spherical tokamak (ST). The plasma scenario chosen for the ST is non-thermal fusion (hot ion mode), which is extensively used on machines like JET and TFTR deuterium–trit…
View article: Effects of Kinetic Ballooning Modes on the electron distribution function in the core of high-performance tokamak plasmas
Effects of Kinetic Ballooning Modes on the electron distribution function in the core of high-performance tokamak plasmas Open
This article is dedicated to study the physical causes of a long-standing issue experienced in different tokamak devices throughout the last decades: the observed discrepancies between electron cyclotron emission (ECE) and Thomson Scatteri…
View article: Parametrical Choice of the Optimized Fusion System for a FFHR
Parametrical Choice of the Optimized Fusion System for a FFHR Open
Fusion–fission hybrid reactors are concepts of subcritical reactors based on the coupling of fusion and fission devices. In this case, the fusion reactor would work as an external neutron supplier for the fission core of the machine. Such …
View article: RFP-MSR Hybrid Reactor Model for Tritium Breeding and Actinides Transmutation †
RFP-MSR Hybrid Reactor Model for Tritium Breeding and Actinides Transmutation † Open
The studies on the development of fusion–fission hybrid reactors (FFHR) have gained consensus in recent years as an intermediate step before fusion energy. This work proposes a possible approach to FFHRs based on the coupling of a Reversed…
View article: High T<i>e</i> discrepancies between ECE and Thomson diagnostics in high-performance JET discharges
High T<i>e</i> discrepancies between ECE and Thomson diagnostics in high-performance JET discharges Open
The present paper is dedicated to the study of the discrepancies encountered in electron temperature (Te) measurements carried out with electron cyclotron emission (ECE) and Thomson scattering (TS) diagnostics in the core of the JET tokama…
View article: The JET hybrid scenario in Deuterium, Tritium and Deuterium-Tritium
The JET hybrid scenario in Deuterium, Tritium and Deuterium-Tritium Open
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 the ITER-like Be/W wall. The development started in pure Deuterium with refine…
View article: A model of non-Maxwellian electron distribution function for the analysis of ECE data in JET discharges
A model of non-Maxwellian electron distribution function for the analysis of ECE data in JET discharges Open
Recent experiments performed in JET at high level of plasma heating, in preparation of, and during the DT campaign have shown significant discrepancies between electron temperature measurements by Thomson Scattering (TS) and Electron Cyclo…
View article: Investigation of<i>T</i><sub><i>e</i></sub>measurements discrepancies between ECE and Thomson diagnostics in high-performance plasmas in JET
Investigation of<i>T</i><sub><i>e</i></sub>measurements discrepancies between ECE and Thomson diagnostics in high-performance plasmas in JET Open
For high-temperature JET and TFTR discharges, electron cyclotron emission (ECE) measurements of central electron temperature were systematically found to be up to 20% higher than those taken with Thomson scattering. In recent high-performa…
View article: Plasma physics and control studies planned in JT-60SA for ITER and DEMO operations and risk mitigation
Plasma physics and control studies planned in JT-60SA for ITER and DEMO operations and risk mitigation Open
A large superconducting machine, JT-60SA has been constructed to provide major contributions to the ITER program and DEMO design. For the success of the ITER project and fusion reactor, understanding and development of plasma controllabili…
View article: Overview of the FTU results
Overview of the FTU results Open
Since the 2018 IAEA FEC Conference, FTU operations have been devoted to several experiments covering a large range of topics, from the investigation of the behaviour of a liquid tin limiter to the runaway electrons mitigation and control a…
View article: HIGH FIELD TOKAMAKS AS COMPACT NEUTRON SOURCES
HIGH FIELD TOKAMAKS AS COMPACT NEUTRON SOURCES Open
Fusion reactor scaling laws can be used to define plasma parameters of high field compact tokamak for low fusion gain applications as it is the case of compact neutron sources.The attractive physics of the high field tokamaks explored on A…
View article: SET UP OF A DETERMINISTIC CALCULATION MODEL FOR THE ANALYSIS OF FUSION-FISSION HYBRID SYSTEMS
SET UP OF A DETERMINISTIC CALCULATION MODEL FOR THE ANALYSIS OF FUSION-FISSION HYBRID SYSTEMS Open
A simplified Fusion-Fission Hybrid System (FFHS) deterministic calculation model has been developed in order to study the coupling between a fusion machine and a subcritical fission system.Monte-Carlo (MC) codes are very flexible and they …
View article: DIAGNOSTICS AND CONTROL OF FUSION-FISSION HYBRID TOKAMAKBASED REACTORS: THE TECHNOLOGY FOR MEASUREMENT SYSTEMS
DIAGNOSTICS AND CONTROL OF FUSION-FISSION HYBRID TOKAMAKBASED REACTORS: THE TECHNOLOGY FOR MEASUREMENT SYSTEMS Open
A fusion-fission hybrid (FFH) reactor is a complex machine, which includes a tokamak fusion neutron source and two blankets: the tritium regeneration and the actinide burner zones.These three systems need their own diagnostics and controls…
View article: Simple FFH pilot experiment model based on DTT-like machine
Simple FFH pilot experiment model based on DTT-like machine Open
View article: Advances in the physics studies for the JT-60SA tokamak exploitation and research plan
Advances in the physics studies for the JT-60SA tokamak exploitation and research plan Open
JT-60SA, the largest tokamak that will operate before ITER, has been designed and built jointly by Japan and Europe, and is due to start operation in 2020. Its main missions are to support ITER exploitation and to contribute to the demonst…
View article: On the identification of the electron temperature profile from polarimetry Stokes vector measurements in Tokamak free-boundary equilibrium reconstruction
On the identification of the electron temperature profile from polarimetry Stokes vector measurements in Tokamak free-boundary equilibrium reconstruction Open
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View article: Approximate analytic expressions using Stokes model for tokamak polarimetry and their range of validity
Approximate analytic expressions using Stokes model for tokamak polarimetry and their range of validity Open
The analysis of the polarimetry measurements has the aim of validating models (De Marco and Segre 1972 Plasma Phys. 14 245), with a careful attention to the clarification of their limits of application. In this paper a new approximation me…
View article: Side emissions during EC injection for PDI studies in FTU tokamak
Side emissions during EC injection for PDI studies in FTU tokamak Open
The evidence of Parametric Decay Instabilities (PDI) excited by the ECH power injected in O-Mode has been explored in FTU Tokamak, using the Collective Thomson Scattering (CTS) diagnostic. The experiments show evidences to support the hypo…
View article: Feasibility of a far infrared laser based polarimeter diagnostic system for the JT-60SA fusion experiment
Feasibility of a far infrared laser based polarimeter diagnostic system for the JT-60SA fusion experiment Open
JT-60SA is the large Tokamak device that is being built in Japan under the Broader Approach Satellite Tokamak Programme and the Japanese National Programme and will operate as a satellite machine for ITER. The main goal of the JT-60SA Prog…
View article: Equilibrium reconstruction at JET using Stokes model for polarimetry
Equilibrium reconstruction at JET using Stokes model for polarimetry Open
This paper presents the first application to real JET data of the new equilibrium code NICE which enables the consistent resolution of the inverse equilibrium reconstruction problem in the framework of non-linear free-boundary equilibrium …
View article: Physics and operation oriented activities in preparation of the JT-60SA tokamak exploitation
Physics and operation oriented activities in preparation of the JT-60SA tokamak exploitation Open
The JT-60SA tokamak, being built under the Broader Approach agreement jointly by Europe and Japan, is due to start operation in 2020 and is expected to give substantial contributions to both ITER and DEMO scenario optimisation. A broad set…
View article: Observation of short time-scale spectral emissions at millimeter wavelengths with the new CTS diagnostic on the FTU tokamak
Observation of short time-scale spectral emissions at millimeter wavelengths with the new CTS diagnostic on the FTU tokamak Open
On the FTU tokamak, the collective Thomson scattering (CTS) diagnostic was renewed for investigating the possible excitation of parametric decay instabilities (PDI) by electron cyclotron (EC) or CTS probe beams in presence of magnetic isla…
View article: Advances in the FTU collective Thomson scattering system
Advances in the FTU collective Thomson scattering system Open
The new collective Thomson scattering diagnostic installed on the Frascati Tokamak Upgrade device started its first operations in 2014. The ongoing experiments investigate the presence of signals synchronous with rotating tearing mode isla…
View article: Diagnostics and control for the steady state and pulsed tokamak DEMO
Diagnostics and control for the steady state and pulsed tokamak DEMO Open
The present paper is devoted to a first assessment of the DEMO diagnostics systems and controls in the context of pulsed and steady state reactor design under study in Europe. In particular, the main arguments treated are: (i) The quantiti…
View article: The upgraded Collective Thomson Scattering diagnostics of FTU
The upgraded Collective Thomson Scattering diagnostics of FTU Open
The 140 GHz Collective Thomson Scattering (CTS) diagnostics installed on the Frascati Tokamak Upgrade (FTU) has been upgraded. The new system now is ready both to detect the thermal CTS radiation (for the first time with the probe frequenc…
View article: Overview of the FTU results
Overview of the FTU results Open
Since the 2012 IAEA-FEC Conference, FTU operations have been largely devoted to runaway electrons generation and control, to the exploitation of the 140 GHz electron cyclotron (EC) system and to liquid metal limiter elements. Experiments o…
View article: Quasi-Isotropic Approximation of Geometrical Optics Method as Adequate Electrodynamical Basis for Tokamak Plasma Polarimetry
Quasi-Isotropic Approximation of Geometrical Optics Method as Adequate Electrodynamical Basis for Tokamak Plasma Polarimetry Open
View article: Main Physical Factors Limiting the Accuracy of Polarimetric Measurements in Tokamak Plasma
Main Physical Factors Limiting the Accuracy of Polarimetric Measurements in Tokamak Plasma Open