L. Zanotto
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View article: Highlights of recent SPIDER results and improvements
Highlights of recent SPIDER results and improvements Open
Three years of experiments on SPIDER allowed characterization of the main features of the source plasma and of the negative ion beam, in the original design configuration. For the large dimensions of the source chamber, and of the extracti…
View article: A strategy to identify breakdown location in MITICA test facility: results of high voltage test campaign
A strategy to identify breakdown location in MITICA test facility: results of high voltage test campaign Open
The Acceleration Grid Power Supply of the MITICA test facility in Padova (Italy) is currently under commissioning. The power conversion system, the DC generator, and the High Voltage equipment have been individually commissioned, whereas t…
View article: RF Stray Currents in SPIDER Power Circuits: Model Assessment and Experimental Results
RF Stray Currents in SPIDER Power Circuits: Model Assessment and Experimental Results Open
The ITER Neutral Beam Test Facility (NBTF), Padua, Italy, hosts two different experiments: Source for Production of Ion of Deuterium Extracted from Rf plasma (SPIDER), the prototype of the ion source (IS) of ITER neutral beam injector (NBI…
View article: First operations with caesium of the negative ion source SPIDER
First operations with caesium of the negative ion source SPIDER Open
The negative-ion based neutral beam injector for heating and current drive of the ITER plasma (ITER HNB) is under development, at present focusing on the optimization of the full-scale plasma source in the SPIDER test stand. The production…
View article: Dynamics of ultralow-q plasmas in the RFX-mod device
Dynamics of ultralow-q plasmas in the RFX-mod device Open
The results are presented of an experimental activity performed in the RFX-mod device aimed at characterizing plasma dynamics in the so-called Ultralow-q (ULq) magnetic configuration, which corresponds to edge safety factor values below 1.…
View article: Development and Validation of a Special Protection System for Internal Fault in a High-Power Three-Level NPC VSC
Development and Validation of a Special Protection System for Internal Fault in a High-Power Three-Level NPC VSC Open
This paper describes the development and validation of an innovative protection system based on medium-voltage fuses for a high-power switching conversion system. This special conversion system, rated to deliver about 56 MW to the load, is…
View article: First operation in SPIDER and the path to complete MITICA
First operation in SPIDER and the path to complete MITICA Open
The requirements of ITER neutral beam injectors (1 MeV, 40 A negative deuterium ion current for 1 h) have never been simultaneously attained; therefore, a dedicated Neutral Beam Test Facility (NBTF) was set up at Consorzio RFX (Padova, Ita…
View article: Progress in the ITER neutral beam test facility
Progress in the ITER neutral beam test facility Open
Heating neutral beam (HNB) injectors, necessary to achieve burning conditions and to control plasma instabilities in ITER, are characterized by such demanding parameters that a neutral beam test facility (NBTF) dedicated to their developme…
View article: Progress in the ITER neutral beam test facility
Progress in the ITER neutral beam test facility Open
Heating neutral beam (HNB) injectors, necessary to achieve burning conditions and to control plasma instabilities in ITER, are characterized by such demanding parameters that a neutral beam test facility (NBTF) dedicated to their developme…
View article: Start of SPIDER operation towards ITER neutral beams
Start of SPIDER operation towards ITER neutral beams Open
Heating Neutral Beam (HNB) Injectors will constitute the main plasma heating and current drive tool both in ITER and JT60-SA, which are the next major experimental steps for demonstrating nuclear fusion as viable energy source. In ITER, in…
View article: The PRIMA Test Facility: SPIDER and MITICA test-beds for ITER neutral beam injectors
The PRIMA Test Facility: SPIDER and MITICA test-beds for ITER neutral beam injectors Open
The ITER Neutral Beam Test Facility (NBTF), called PRIMA (Padova Research on ITER Megavolt Accelerator), is hosted in Padova, Italy and includes two experiments: MITICA, the full-scale prototype of the ITER heating neutral beam injector, a…
View article: H-mode achievement and edge features in RFX-mod tokamak operation
H-mode achievement and edge features in RFX-mod tokamak operation Open
The RFX-mod experiment is a fusion device designed to operate as a reversed field pinch (RFP), with a major radius R = 2 m and a minor radius a = 0.459 m. Its high versatility recently allowed operating it also as an ohmic tokamak, allowin…
View article: The ITER Neutral Beam Test Facility towards SPIDER operation
The ITER Neutral Beam Test Facility towards SPIDER operation Open
SPIDER is one of two projects of the ITER Neutral Beam Test Facility under construction in Padova, Italy, at the Consorzio RFX premises. It will have a 100 keV beam source with a full-size prototype of the radiofrequency ion source for the…
View article: Conceptual design of the DEMO neutral beam injectors: main developments and R&D achievements
Conceptual design of the DEMO neutral beam injectors: main developments and R&D achievements Open
The objectives of the nuclear fusion power plant DEMO, to be built after the ITER experimental reactor, are usually understood to lie somewhere between those of ITER and a 'first of a kind' commercial plant. Hence, in DEMO the issues relat…
View article: The DTT device: Power supplies and electrical distribution system
The DTT device: Power supplies and electrical distribution system Open
This paper presents the design criteria and the preliminary characteristics of the power supply and electrical systems of the Divertor Tokamak Test (DTT) facility. The power supply system has to feed: 6 superconducting modules of the centr…
View article: First experiments with the negative ion source NIO1
First experiments with the negative ion source NIO1 Open
Neutral Beam Injectors (NBIs), which need to be strongly optimized in the perspective of DEMO reactor, request a thorough understanding of the negative ion source used and of the multi-beamlet optics. A relatively compact radio frequency (…
View article: Ion collector design for an energy recovery test proposal with the negative ion source NIO1
Ion collector design for an energy recovery test proposal with the negative ion source NIO1 Open
Commercial viability of thermonuclear fusion power plants depends also on minimizing the recirculation power used to operate the reactor. The neutral beam injector (NBI) remains one of the most important method for plasma heating and contr…