16 results on '"Aldo Di Zenobio"'
Search Results
2. Estimation of the power dissipation on the casing of DTT toroidal field coil during a fast plasma disruption
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Luigi Morici, Giuseppe Messina, Aldo Di Zenobio, Roberto Bonifetto, and Giuseppe Ramogida
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History ,Polymers and Plastics ,Nuclear Energy and Engineering ,Mechanical Engineering ,General Materials Science ,Business and International Management ,Industrial and Manufacturing Engineering ,Civil and Structural Engineering - Published
- 2023
- Full Text
- View/download PDF
3. Magnetostructural Calculations and Design Study of the DTT Central Solenoid
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Lorenzo Giannini, Antonio della Corte, Simonetta Turtu, Gherardo Romanelli, Aldo Di Zenobio, Luigi Muzzi, Lorenzo Zoboli, A. Anemona, Giannini, L., Muzzi, L., Zenobio, A. D., Anemona, A., Della Corte, A., Romanelli, G., Zoboli, L., and Turtu, S.
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Tokamak ,Materials science ,Tokamak devices ,Nuclear engineering ,Finite element analysi ,fusion reactors ,Solenoid ,Superconducting magnet ,01 natural sciences ,law.invention ,law ,0103 physical sciences ,superconducting magnet ,Electrical and Electronic Engineering ,010306 general physics ,Divertor ,Finite element analysis ,Fusion power ,Condensed Matter Physics ,Magnetic flux ,Electronic, Optical and Magnetic Materials ,Electromagnetic coil ,superconducting magnets ,Magnet ,fusion reactor - Abstract
The Divertor Tokamak Test facility (DTT) is a project of an experimental tokamak reactor developed in Italy, in the framework of the European Fusion Roadmap. This work presents the magnetic and the structural assessment of the performance of the DTT central solenoid. The CS is the core magnet of the poloidal system and generates the magnetic flux needed to induce the plasma current. This magnet is composed of a stack of six layer-wound independently energized modules, comprised of Nb3Sn Cable-in-Conduit Conductors. To optimize the amount of superconductive material, each module is divided into two submodules. The inner- most submodule operates in a range of about 8/13.5 T, while the outer one at 6/8.5 T. The objective of the design process is to obtain a coil that is capable of providing the required magnetic performance while being structurally compliant. To address this problem, an analytical assessment has been carried out and a thoroughly parametric Finite Element Model (FEM) has been implemented.
- Published
- 2020
- Full Text
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4. Structural Assessment Procedure of the Toroidal Field Magnet System for the Divertor Tokamak Test
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Gherardo Romanelli, Antonio della Corte, A. Anemona, Lorenzo Zoboli, Riccardo Righetti, Luigi Muzzi, Lorenzo Giannini, Aldo Di Zenobio, and Simonetta Turtu
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Tokamak ,Test facility ,Computer science ,Toroidal field ,Nuclear engineering ,Divertor ,Condensed Matter Physics ,Finite element method ,Electronic, Optical and Magnetic Materials ,law.invention ,law ,Magnet ,Point (geometry) ,Electrical and Electronic Engineering ,Casing - Abstract
The Divertor Tokamak Test facility (DTT) is an experimental tokamak machine to be built in Frascati, Italy, at the ENEA research center. During its development, the DTT has gone through several design iterations. Developing a rigorous finite-element methodology to evaluate the performance of all its components has thus been a critical part of the verification phase of each new update. This work summarizes the assessment procedure that currently supports the design of the Toroidal Field magnet system, including the superconducting winding pack ( $\mathrm{\mathbf {Nb_3Sn}}$ ), the casing structure and all of the inter-coil structures. Given the high complexity of the 3D structure to reproduce, we implemented some modeling simplifications to solve the problems. Here we describe the finally adopted methodology next to all the motivations we examined to make sure the results were sound and reliable from an engineering point of view.
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- 2020
- Full Text
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5. Transient Electrical Behaviour of the TF Superconducting Coils of Divertor Tokamak Test Facility During a Fast Discharge
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Giuseppe Messina, Carmelo Riccardo Lopes, Pietro Zito, Aldo Di Zenobio, Chiarasole Fiamozzi Zignani, Alessandro Lampasi, Luigi Morici, Giuseppe Ramogida, Giordano Tomassetti, Guido Ala, Gaetano Zizzo, Messina G., Lopes C.R., Zito P., Zenobio A.D., Fiamozzi Zignani C., Lampasi A., Morici L., Ramogida G., Tomassetti G., Ala G., and Zizzo G.
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Fast Discharge ,Circuit faults ,FDU ,Condensed Matter Physics ,Ground fault conditions ,Central Solenoid Model Coil (CSMC) ,Electronic, Optical and Magnetic Materials ,Settore ING-IND/33 - Sistemi Elettrici Per L'Energia ,Transient analysis ,Settore ING-IND/31 - Elettrotecnica ,Insulation ,Integrated circuit modeling ,Discharges (electric) ,Toroidal Field Model Coil (TFMC) ,Superconducting magnets ,Electrical and Electronic Engineering ,Voltage distribution ,Inductance ,DTT ,Electromagnetic modelling - Abstract
The paper is focused on the electromagnetic analysis of the Toroidal Field (TF) superconducting coils of the Divertor Tokamak Test facility (DTT) when electrical transients occur in the TF coils 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 microseconds occurs at the TF coil terminals and it electrically stresses the insulations of TF coils itsef. To investigate the voltage distribution across, inside and between different Double Pancakes (DPs) of each TF coil, a lumped parameters circuital model has been developed and implemented in Ansys Simplorer simulation environment. This model includes both the detailed sub-model of each TF coil 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 TF coil, the voltages of each TF coil (terminal-to-terminal, terminal-to-ground, across of adjacent DPs and so) 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.
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- 2022
6. Updated structural assessment of the DTT Poloidal Field Coils
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Lorenzo Zoboli, Alessandro Anemona, Aldo Di Zenobio, Lorenzo Giannini, Luigi Muzzi, Gherardo Romanelli, Simonetta Turtu, Giuseppe Vairo, and Antonio della Corte
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Fasteners ,Toroidal magnetic fields ,FEM analysis ,Coils ,Condensed Matter Physics ,Stress ,Divertor Tokamak test ,Electronic, Optical and Magnetic Materials ,Superconducting magnets ,Plasmas ,Magnetomechanical effects ,poloidal field coils ,Settore ICAR/08 ,Electrical and Electronic Engineering - Published
- 2022
7. Design and Characterization of the Interlayer Joint between Low-Field Nb3Sn Conductors of a Layer Wound DEMO TF Coil
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Simonetta Turtu, Kamil Sedlak, Riccardo Righetti, Chiarasole Fiamozzi Zignani, A. Anemona, Luigi Muzzi, R. Freda, Antonio della Corte, A. Bragagni, Andrea Formichetti, Mithlesh Kumar, G. Molino, Boris Stepanov, Lucio Merli, Gianluca De Marzi, Massimo Seri, Mohammed Arabi, Pierluigi Bruzzone, Marco Roveta, L. Affinito, G. Roveta, Stefano Galignano, Valentina Corato, Aldo Di Zenobio, S. Chiarelli, Muzzi, Luigi, Affinito, Luigi, Chiarelli, Sandro, Corato, Valentina, Della Corte, Antonio, De Marzi, Gianluca, Di Zenobio, Aldo, Fiamozzi Zignani, Chiarasole, Freda, Rosa, Turtu, Simonetta, Anemona, Alessandro, and Formichetti, Andrea
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Superconductivity ,Materials science ,Mechanical engineering ,Fusion Magnets ,AC loss ,Superconducting magnet ,Condensed Matter Physics ,7. Clean energy ,01 natural sciences ,Electronic, Optical and Magnetic Materials ,Conductor ,Conceptual design ,Electromagnetic coil ,Magnet ,Cable-in-Conduit-Conductor ,0103 physical sciences ,Electrical and Electronic Engineering ,010306 general physics ,Electrical conductor ,Joint (geology) ,DEMO ,Joint Resistance - Abstract
In the frame of the conceptual design studies for the Toroidal Field (TF) coils of DEMO, a solution based on a layer-wound magnet, rectangular-shaped Cable-in-Conduit conductors and W&R manufacturing approach, is being developed. The feasibility and performance of a large-size Nb3Sn conductor operating at about 82 kA in a 13 T field has been proven in the past. Another key technology to be demonstrated for a layer-wound TF coil, is that of a joint between two different conductor grades, to be possibly manufactured in-line during winding. The proposed joint solution would provide the minimum room occupancy, with the joint embedded within the winding pack volume. A joint between two low-field conductor grades, i.e., constituted of a small number of superconducting strands and a high number of stabilization copper wires, has been designed and manufactured. The two conductor lengths are characterized by a different number of superconducting wires and different outer dimensions. A joint sample has been assembled and instrumented, in the configuration allowing testing at the SULTAN facility of the Swiss Plasma Center. Both DC and AC performance of the joint has been characterized at the DEMO TF operating conditions. The present paper reports the main manufacturing steps for the joint and its main test results. The implications on the performance and design approach of the TF coil are also discussed, based on the outcome of such tests.
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- 2021
8. Design Studies, Magnetic Calculations and Structural Assessment For the DTT Central Solenoid
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Aldo Di Zenobio, A. Anemona, Antonio della Corte, Luigi Muzzi, F.M. De Baggis, Simonetta Turtu, Gherardo Romanelli, Lorenzo Zoboli, Lorenzo Giannini, G. De Marzi, Giannini, Lorenzo, Muzzi, Luigi, DI ZENOBIO, Aldo, Anemona, Alessandro, Romanelli, Gherardo, Zoboli, Lorenzo, De Marzi, G., De Baggis, F. M., Turtu, Simonetta, and DELLA CORTE, Antonio
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Materials science ,Tokamak ,Divertor ,Nuclear engineering ,fusion reactors ,Solenoid ,Superconducting magnet ,finite element analysis ,Fusion power ,Condensed Matter Physics ,01 natural sciences ,Magnetic flux ,Electronic, Optical and Magnetic Materials ,law.invention ,Magnetic field ,law ,Magnet ,0103 physical sciences ,Electrical and Electronic Engineering ,superconducting magnets ,010306 general physics ,tokamak devices - Abstract
The “Divertor Tokamak Test facility” (DTT) is an experimental fusion reactor being built in Frascati (IT) in the framework of the European Fusion Roadmap. The DTT Central Solenoid operates in a pulsed regime to generate the magnetic flux needed to induce the plasma current and is therefore subjected to burdensome load conditions. In DTT, this magnet will consist of a stack of six layer-wound independently energized modules, wound with Nb 3 Sn Cable-in-Conduit Conductors. Different layout solutions have been studied to improve the performance of the CS in terms of magnetic flux density and structural integrity. The design presented is the result of the “Design Explorer” algorithm that has been specifically developed for this purpose. This code investigates all possible configurations to find the optimum conductor geometry and winding solution by considering measurable physical quantities to maximize the magnetic flux density while maintaining mechanical stresses at an acceptable level. This manuscript includes the electromagnetic calculation related to the heterogeneous plasma scenarios of the machine, the static structural and the fatigue life assessment and the full set of in-depth analyses performed for the qualification of the main components of the CS structure.
- Published
- 2021
9. Structural Assessment of the DTT Poloidal Field Coil System
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A. Anemona, Lorenzo Zoboli, Antonio della Corte, Lorenzo Giannini, Riccardo Righetti, Aldo Di Zenobio, Giuseppe Vairo, Simonetta Turtu, Luigi Muzzi, Gherardo Romanelli, Anemona, A., Di Zenobio, A., Giannini, L., Muzzi, L., Righetti, R., Romanelli, G., Turtu, S., Vairo, G., Zoboli, L., and Della Corte, A.
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Materials science ,Tokamak ,Nuclear engineering ,FEM analysis ,Context (language use) ,Poloidal coils ,Plasma shape ,law.invention ,Divertor tokamak test ,poloidal field coil ,law ,Settore ICAR/08 ,Failure criteria ,Operating condition ,Poloidal Field coils ,Power exhausts ,Structural assessments ,Electrical and Electronic Engineering ,FEM analysi ,Divertor ,Process (computing) ,Plasma ,Condensed Matter Physics ,Finite element method ,Electronic, Optical and Magnetic Materials ,Power (physics) ,Electromagnetic coil - Abstract
In the context of the European fusion roadmap, the divertor tokamak test (DTT) experimental reactor is intended to investigate alternative divertor configurations in view of the EU-DEMO power exhaust handling necessities. The six poloidal field coils of this tokamak are responsible for the plasma shape and equilibrium, and numerous steps were taken to obtain a design that is magnetically consistent with plasma requirements and structurally compliant with the chosen failure criterion. This work presents the structural assessment that has been performed on the poloidal coil system, taking into account the cooldown process, the energisation to operating conditions and fatigue. Finite Element Analysis has been employed as the principal means of investigation.
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- 2020
10. Thermal-Hydraulic Analysis of the DTT Toroidal Field Magnets in DC Operation
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Andrea Zappatore, Aldo Di Zenobio, Roberto Bonifetto, Luigi Muzzi, Roberto Zanino, Simonetta Turtu, Bonifetto, R., Di Zenobio, A., Muzzi, L., Turtù, Simonetta, Zanino, R., and Zappatore, A.
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Test bench ,Tokamak ,Materials science ,Nuclear engineering ,Divertor ,toroidal field magnet ,modeling ,Condensed Matter Physics ,01 natural sciences ,DTT ,nuclear fusion ,thermal-hydraulics ,Electronic, Optical and Magnetic Materials ,law.invention ,Thermal hydraulics ,Physics::Plasma Physics ,law ,Shield ,Magnet ,0103 physical sciences ,Active cooling ,Electrical and Electronic Engineering ,010306 general physics ,Casing - Abstract
The Divertor Tokamak Test (DTT) facility is currently under design in Italy. This fully superconductive compact tokamak will be the test bench of several DEMO-relevant divertor solutions. The 4C code model of a DTT toroidal field magnet (including its structures) is developed here and used to support some important design decisions related to the neutron shield to be adopted, the need of an active cooling of the casing and the static heat load reduction. The simulations confirm the need to actively cool the casing by suitable cooling channels, but also the need of a proper neutron shield to reduce the nuclear heat load on the superconducting coils. On the other hand, the proposed static heat load reduction measures do not appear to be effective enough to satisfy the design requirement of 1.4 K for the minimum temperature margin.
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- 2020
11. DTT's Role, Characteristics Design Status
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Paolo Innocente, Gian Mario Polli, G. Ramogida, Rosaria Villari, F. Crisanti, Giuseppe Di Gironimo, Marco Valisa, A. Cucchiaro, Piero Martin, Gustavo Granucci, Aldo Di Zenobio, S. Roccella, Aldo Pizzuto, Roberto Ambrosino, Sandro Sandri, Alessandro Lampasi, Raffaele Martone, Raffaele Albanese, Alexander Rydzy, Polli, G. M., Albanese, R., Crisanti, F., Martin, P., Pizzuto, A., Ambrosino, R., Cucchiaro, A., Di Gironimo, G., Di Zenobio, A., Granucci, G., Innocente, P., Lampasi, A., Martone, R., Ramogida, G., Roccella, S., Rydzy, A., Sandri, S., Valisa, M., and Villari, R.
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Flexibility (engineering) ,Integrated design ,Tokamak ,Test facility ,Computer science ,Divertor ,Project proposal ,01 natural sciences ,010305 fluids & plasmas ,law.invention ,law ,0103 physical sciences ,Systems engineering ,divertor ,superconducting magnets ,010306 general physics ,nuclear fusion ,DTT - Abstract
The Divertor Tokamak Test facility is an Italian experimental facility under design and construction at ENEA C.R. Frascati. The main goal of DTT is to provide an integrated environment, relevant to DEMO, where testing possible solution to the power exhaust problem in a tokamak (like for example: i) Plasma facing components technology ; ii) Plasma and divertor shape; iii) impurity seeding to increase radiation). In this respect, DTT has been designed to be flexible and adopting technologies relevant to DEMO. After its initial inception in 2015, concluded with the publication of the "DTT project proposal", a complete re-baseline has been provided oncluded with the publication of the "DTT Interim Design Report" in 2019, aimed at accommodating the request of flexibility coming from the international fusion community. During 2019, the engineering integration activity has started and the first construction contracts have been signed. This paper provides an overview of the integrated design activity towards the realization of the facility within 2025.
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- 2020
12. Performance Analysis of the NbTi PF Coils for the EU DEMO Fusion Reactor
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Roberto Bonifetto, Andrea Zappatore, Laura Savoldi, Simonetta Turtu, Roberto Zanino, Pierluigi Bruzzone, Valentina Corato, Kamil Sedlak, Aldo Di Zenobio, Turtu, S., Zenobio, A. D., and Corato, V.
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Materials science ,EU DEMO ,Nuclear engineering ,4C code ,Fusion power ,Condensed Matter Physics ,01 natural sciences ,7. Clean energy ,Nuclear fusion reactor ,010305 fluids & plasmas ,Electronic, Optical and Magnetic Materials ,uperconducting magnet ,thermal-hydraulic analysis ,0103 physical sciences ,Nuclear fusion reactor, EU DEMO, Supercon-ducting magnets, Thermal-hydraulic analysis, 4C code ,Supercon-ducting magnets ,superconducting magnets ,Electrical and Electronic Engineering ,010306 general physics - Abstract
The first design of the NbTi poloidal field (PF) coils for the EU DEMO fusion reactor has been proposed by the Swiss Plasma Center and by the Italian National Agency for New Technologies, Energy and Sustainable Economic Development. The thermal-hydraulic (TH) performance analysis of the PF coil system presented in this work has been carried out using the state-of-The-Art 4C code. The minimum temperature margin and the TH response of the coils to the heat deposition due to AC losses are computed in two different plasma scenarios, using a single time constant ( nτ) whose value is currently unknown. Therefore, we apply our model to parametrically assess the sensitivity of the PF performance to a range of nτ values. The calculations are also performed taking into account that the high void fraction design of the conductor leads to the opening of a channel due to the Lorentz force. For all situations considered here, the 4C code predicts that the temperature margin never goes below the acceptable minimum of 1.5 K. © 2002-2011 IEEE.
- Published
- 2018
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13. Bending Behavior of HTS Stacked Tapes in a Cable-in-Conduit Conductor with Twisted Al-Slotted Core
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F. L. Fabbri, Luigi Muzzi, Gianluca De Marzi, Alessandro Rufoloni, Angelo Vannozzi, Aldo Di Zenobio, Andrea Augieri, Giuseppe Celentano, Antonio della Corte, Marcello Marchetti, Celentano, G., Vannozzi, A., De Marzi, G., Marchetti, M., Augieri, A., DI Zenobio, A., Fabbri, F., Muzzi, L., Rufoloni, A., and Della Corte, A.
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Materials science ,Coated conductors ,Bend radius ,chemistry.chemical_element ,Bending ,01 natural sciences ,HTS cable ,cuprates ,Stack (abstract data type) ,Aluminium ,cuprate ,electromechanical effect ,0103 physical sciences ,Duct (flow) ,Electrical and Electronic Engineering ,Composite material ,010306 general physics ,Coated conductor ,Contact resistance ,electromechanical effects ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Conductor ,chemistry ,Slippage - Abstract
In this paper, we report on the experimental study of the bending behavior, at 77 K, of a cable-in-conduit conductor composed of a stack of REBa 2 Cu 3 O 7-x (REBCO) tapes inserted into a helical duct formed in the extruded aluminum cylindrical core. The investigation was carried out by powering each single tape individually. By the analysis of the single tape I c dependence as a function of the bending radius, R b , the effect of bending strain as a function of tape position inside the stack was investigated for each tape. The results evidence the good bending strain tolerance of all the tapes, showing the onset of degradation at R b ≈ 0.25 m, ascribed to the slippage occurring among tapes within the stack. Interestingly, the decrease in the intertape contact resistance between neighboring tapes with respect to the straight cable condition reveals that the bending stress results in a beneficial additional transverse load on the stacks, which leads to a more uniform compaction of tape stack. The experimental I c behavior with R b has been explained considering that the current transfer mechanism among tapes might mitigate the degradation of the tape I c due to the bending strain. The identification of the mechanisms acting on individual tapes under cable bending conditions is a relevant achievement in perspective of the interpretation of the electromechanical behavior of the conductor with all tapes powered in parallel.
- Published
- 2019
14. Progress on the design development and prototype manufacturing of the ITER In-vessel coils
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Nicola Mariani, A. Xu, H.P. Marti, Chao Zhou, Neil Mitchell, B. Macklin, Huan Jin, Yucheng Wu, Arnaud Devred, Riccardo Righetti, A. della Corte, H. Omran, J. Jin, Alexander Vostner, Aldo Di Zenobio, F. Long, C. Sborchia, A. Anemona, A. Encheva, Ch. Jun, and Energy, Materials and Systems
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Procurement ,Bending (metalworking) ,VS ,Computer science ,Mechanical engineering ,Welding ,Blanket ,01 natural sciences ,010305 fluids & plasmas ,law.invention ,Vertical stabilization ,law ,ITER ,0103 physical sciences ,Prototype manufacturing ,General Materials Science ,010306 general physics ,Electrical conductor ,Civil and Structural Engineering ,Mechanical Engineering ,Reference design ,IVC ,In-Vessel coils ,Mineral insulated conductor ,n/a OA procedure ,Conductor ,Edge localized modes ,Nuclear Energy and Engineering ,Electromagnetic coil ,Vacuum chamber ,Elm - Abstract
Abstracrt ITER is incorporating two types of In-Vessel Coils (IVCs): ELM Coils to mitigate Edge Localized Modes and VS Coils to provide a reliable Vertical Stabilization of the plasma. Strong coupling with the plasma is required in order that the ELM and VS Coils can meet their performance requirements. Accordingly, the IVCs are mounted on the Vacuum Vessel (VV) inner wall, in close proximity to the plasma, just behind the Blanket Shield Modules (BSM). Due to high radiation environment, mineral insulated copper conductors enclosed in a stainless steel jacket have been selected. The reference design and prototype work provided a good basis for the development of radiation resistant conductor capable of operating within the harsh conditions in ITER vacuum chamber. However, this effort identified shortcomings in achieving satisfactory manufacturing solution, and most significantly, difficulties in brazing the brackets onto the ELM coil conductor. Since this process has not proven successful, alternative designs are under development and prototyping. Prototype manufacturing on the alternative designs has been completed at ICAS, Italy and ASIPP, China. The aim was to eliminate the need for internal coil joints, to prove the principle of longer conductor length manufacturing, and to perform bending and welding trials on two different conductor cross-sections: circular and square. The procurement of the IVCs and their conductors will be done via direct call for tender from the ITER Organization. This paper will give an overview of the alternative design and prototype manufacturing of the ITER In-Vessel coils.
- Published
- 2017
15. Design, Manufacture, and Test of an 80 kA-Class Nb3Sn Cable-In-Conduit Conductor With Rectangular Geometry and Distributed Pressure Relief Channels
- Author
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Aldo Di Zenobio, Simonetta Turtu, Antonio Aveta, Riccardo Righetti, A. Anemona, G. Roveta, Luigi Muzzi, Massimo Seri, S. Chiarelli, Stefano Galignano, Pierluigi Bruzzone, Boris Stepanov, R. Freda, A. Bragagni, Kamil Sedlak, Valentina Corato, Antonio della Corte, L. Affinito, Fabio Gabiccini, Rainer Wesche, Turtu, S., Freda, R., Zenobio, A. D., Della Corte, A., Corato, V., Chiarelli, S., Affinito, L., and Muzzi, L.
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Resistive touchscreen ,Materials science ,Center (category theory) ,Geometry ,Superconducting magnet ,Condensed Matter Physics ,01 natural sciences ,7. Clean energy ,nuclear reactor ,DEMO ,cable-in-conduit-conductor ,010305 fluids & plasmas ,Electronic, Optical and Magnetic Materials ,Magnetic field ,Conductor ,Electromagnetic coil ,0103 physical sciences ,Electrical and Electronic Engineering ,Connection (algebraic framework) ,010306 general physics ,Electrical conductor - Abstract
Within the frame of the R&D activities carried out in Europe for the toroidal field coils of the nuclear fusion device DEMO, a fundamental milestone was considered to be the demonstration of Nb3Sn cable-in-conduit conductors (CICC) performance in the demanding range of interest for DEMO. Among the different technological solutions envisaged, the present paper deals with a wind & react CICC solution, with rectangular geometry, thick steel jacket, and distributed pressure relief channel, designed to operate at 82 kA in a magnetic field of 13 T and with a current sharing temperature ${\rm{T}}_{{\rm{cs}}}\,{\rm{> \,6.5\,K}}$ . The main manufacturing steps of the prototype conductor are described in the present paper, carried out within industrial environment, partly using the facilities and procedures available for the manufacture of ITER conductors. A sample was designed for the EDIPO facility at the Swiss Plasma Center, Switzerland, in the configuration usually adopted for the test of ITER poloidal field conductors, where the two straight conductor legs are part of the same cable length, with a continuous transition through a bottom hairpin-type joint, thus avoiding any resistive connection. The conductor has been characterized in terms of dc performance at relevant operating conditions and the absence of any performance degradation with electro-magnetic load cycles has been verified, thus, qualifying the proposed technological solution. AC losses and thermo-hydraulic tests have also been carried out, providing relevant information for further coil design.
- Published
- 2017
- Full Text
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16. Test of the MF-CICC Conductor Designed for the 12-T Outsert Coil of the HFML 45-T Hybrid Magnet
- Author
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Jos A. A. J. Perenboom, Federico Quagliata, Pierluigi Bruzzone, Aldo Di Zenobio, Kamil Sedlak, Antonio della Corte, Luigi Muzzi, Boris Stepanov, Andries den Ouden, Quagliata, F., Di Zenobio, A., Muzzi, L., and Della Corte, A.
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Electromagnetics ,Materials science ,CICC ,twist pitch ,Nb3Sn ,superconducting cable ,performance degradation ,Superconducting magnet ,Correlated Electron Systems / High Field Magnet Laboratory (HFML) ,01 natural sciences ,010305 fluids & plasmas ,chemistry.chemical_compound ,Nuclear magnetic resonance ,0103 physical sciences ,Electrical and Electronic Engineering ,Niobium-tin ,010306 general physics ,Electrical conductor ,Resistive touchscreen ,business.industry ,Structural engineering ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Conductor ,chemistry ,Electromagnetic coil ,Magnet ,business ,uperconducting cable - Abstract
A 45-T hybrid magnet is being built at the High Field Magnet Laboratory of the Radboud University in Nijmegen, The Netherlands. The hybrid magnet consists of a 12-T cable-in- conduit-conductor (CICC) Nb 3Sn superconducting outsert and a 33-T resistive insert magnet. To verify the CICC design, a thorough testing has been completed in the SULTAN facility at Swiss Plasma Center, EPFL in Villigen (Switzerland) for the medium- grade conductor of the outsert. In two test campaigns, the dc cable performance (current-sharing temperature, critical current), the ac loss, and the conductor's performance stability during cyclic loading and after one warmup and cooldown cycle have been investigated. Two different cable layouts were tested - one with a very short twist pitch (STP) and the second one with a long twist pitch (LTP) cabling pattern. As both conductors were made of the same Nb 3Sn strand and underwent the same heat treatment and sample preparation procedure, the effect of the twist pitch on the ac loss and on the dc performance with respect to cyclic loading could be reliably evaluated. The test results show that both cable layouts are actually very robust. The cable could withstand 2000 load cycles and the warmup and cooldown cycle without any significant degradation of the dc performance, and even the overloading at BI product (field multiplied by current) approximately two times larger than those foreseen during magnet operation did not lead to a big performance change. Small differences between the STP and LTP options have been observed, indicating that the STP conductor withstands high electromagnetic loads better than the LTP one. © 2002-2011 IEEE.
- Published
- 2016
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