Search

Your search keyword '"Lampasi, Alessandro"' showing total 28 results
Start Over Author "Lampasi, Alessandro" Publisher ieee
28 results on '"Lampasi, Alessandro"'

9. Transient Electrical Behavior of the TF Superconducting Coils of Divertor Tokamak Test Facility During a Fast Discharge.

Author

Messina, Giuseppe, Lopes, Carmelo Riccardo, Zito, Pietro, Di Zenobio, Aldo, Zignani, Chiarasole Fiamozzi, Lampasi, Alessandro, Morici, Luigi, Ramogida, Giuseppe, Tomassetti, Giordano, Ala, Guido, and Zizzo, Gaetano

Subjects
SUPERCONDUCTING coils, ELECTRIC transients, TESTING laboratories, TOKAMAKS, FUSION reactor divertors, TRANSIENT analysis
Abstract

The article is focused on the electromagnetic analysis of the toroidal field superconducting coils (TFCs) of the Divertor Tokamak Test facility (DTT) when electrical transients occur in the TFCs system: for example, during the operations of the fast discharge units (FDUs) and considering also, the simultaneous occurrence of a fault condition. During the FDU intervention, a transient voltage excitation lasting few milliseconds occurs at the TFC terminals and it electrically stresses the insulations of TFCs itself. To investigate the voltage distribution across, inside and between different double pancakes (DPs) of each TFC, a lumped parameters circuital model has been developed and implemented in Ansys Simplorer simulation environment. This model includes both the detailed submodel of each TFC and FDU. The transient analyses have been carried out for two different scenarios: a reference one and a failure scenario, considering three different fault resistance values and also two different values of the resistance connecting the TF case to ground. In order to verify the correct sizing of the coil insulation and the TF case-to-ground resistance value inserted in the circuit of each TFC, the voltages of each TFC (terminal-to-terminal, terminal-to-ground, across of adjacent DPs, and between other circuit points) were computed in the time domain (in the range of milliseconds) for both scenarios. An overview of calculations and simulation results is presented and discussed, pointing out a high sensitivity of fault conditions and of overvoltage values and addressing mitigation strategies. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

12. Power Systems for the DTT Nuclear Fusion Experiment

Author

Caldora, Marzia, primary, Greco, Gabriele, additional, Falvo, Maria Carmen, additional, Marelli, Gianluca, additional, Bigioni, Stefano, additional, Caucci, Stafano, additional, Trotta, Antonio, additional, Romano, Roberto, additional, Zito, Pietro, additional, and Lampasi, Alessandro, additional

Published
2021
Full Text
View/download PDF

14. DTT’s Role, Characteristics & Design Status

Author

Polli, Gian Mario, primary, Albanese, Raffaele, additional, Crisanti, Flavio, additional, Martin, Piero, additional, Pizzuto, Aldo, additional, Ambrosino, Roberto, additional, Cucchiaro, Antonio, additional, Di Gironimo, Giuseppe, additional, Di Zenobio, Aldo, additional, Granucci, Gustavo, additional, Innocente, Paolo, additional, Lampasi, Alessandro, additional, Martone, Raffaele, additional, Ramogida, Giuseppe, additional, Roccella, Selanna, additional, Rydzy, Alexander, additional, Sandri, Sandro, additional, Valisa, Marco, additional, and Villari, Rosaria, additional

Published
2020
Full Text
View/download PDF

22. Compact Power Supply With Integrated Energy Storage and Recovery Capabilities for Arbitrary Currents up to 2 kA.

Author

Lampasi, Alessandro, Taddia, Giuseppe, Tenconi, Sandro M., and Gherdovich, Filippo

Subjects
*POWER resources, *HOUSEHOLD appliances, *ENERGY storage, *TOKAMAKS, *ELECTRIC potential
Abstract

In many relevant cases requiring a net energy comparable with that of a household appliance, the power supplies (PSs) and the electrical systems must be oversized to sustain short peak demands. The same equivalent energy could be achieved by storing and distributing the power over the time. These considerations lead to a new PS concept based on the exploitation of the energy stored between the actual operations. The new compact ($60\,\,\text {cm} \times 120\,\,\text {cm} \times 190$ cm) PS is able to generate arbitrary currents up to 2 kA by an integrated energy storage system based on supercapacitors. The delivered output power (approximately 200 kW) is obtained from a very low and tunable input power (<1 kW). Furthermore, a portion of the injected power can be recovered in the storage system. Even though the system was designed for a specific project (the PROTO-SPHERA spherical tokamak), the presented approach can be applied to general-purpose PSs, and there are encouraging prospects to extend it to large facilities with higher currents and voltages. [ABSTRACT FROM AUTHOR]

Published
2018
Full Text
View/download PDF

24. Type Tests of JT-60SA Central Solenoid/Equilibrium Field Superconducting Magnet Power Supplies.

Author

Zito, Pietro, Lampasi, Alessandro, Novello, Luca, Matsukawa, Makoto, Shimada, Katsuhiro, Hatakeyama, S., Portesine, Marco, Dorronsoro, Ander, Vian, Dionisio, and Celaya, Koldo

Subjects
*TOKAMAKS testing, *SUPERCONDUCTING device testing, *SUPERCONDUCTING magnets testing, *POWER distribution in nuclear reactors, *AC DC transformers, *THYRISTORS, *MAGNETIC field measurements
Abstract

JT-60SA is a superconducting tokamak in the framework of the broader approach agreement between Europe and Japan. For this international project among its various procurements, the Italian National Agency for new technology energy and sustainable economic development (ENEA) is providing four ac/dc converters for the central solenoid (CS) superconducting magnets, two ac/dc converters for the equilibrium field (EF) superconducting magnets, and two ac/dc converters for the fast plasma position control coils (FPPCC). Furthermore, ENEA is also providing six converter transformers of which four are of the dry type for FPPCC power supplies (PSs) and two of oil type for CS PSs. CS/EF PSs feed poloidal superconducting magnets of JT-60SA, whose purpose is the generation of strong magnetic fields able to induce and confine the plasma current in a prefixed geometrical configuration. The control system of CS/EF PSs has to be able to reproduce in real-time a reference current or voltage profile, known as “scenario” and these are particularly critical in these systems for the high currents required and for the high magnetic energy stored in the superconducting magnets. All performed type tests, carried out in accordance to the IEC60146 Standards, pointed toward a good dynamic behavior of the control system both for forward and for reverse rectifier bridges, assuring the smooth transitions between different operating modes: single mode, circulating current mode and dual mode. This is the focus of this paper. [ABSTRACT FROM AUTHOR]

Published
2018
Full Text
View/download PDF

28. Advancement on the procurement of Power Supply systems for JT-60SA

Author

Novello, Luca, primary, Coletti, Alberto, additional, Baulaigue, Olivier, additional, Dumas, Nicolas, additional, Ferro, Alberto, additional, Gaio, Elena, additional, Maistrello, Alberto, additional, Lampasi, Alessandro, additional, Zito, Pietro, additional, Matsukawa, Makoto, additional, Shimada, Katsuhiro, additional, and Yamauchi, Kunihito, additional

Published
2015
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results