High-Field Ignition-Capable Stellarator i-ASTER: Initial Structural Evaluation

Vicente Queral; Esther Rincon; Santiago Cabrera; Arnold Lumsdaine; Francesco A. Volpe; Francesco A. Volpe; Francisco Tabares

doi:10.1109/TPS.2020.2972408

High-Field Ignition-Capable Stellarator i-ASTER: Initial Structural Evaluation

Vicente Queral, Esther Rincon, Santiago Cabrera, Arnold Lumsdaine, Francesco A. Volpe, Francesco A. Volpe, Francisco Tabares

Fusion Technology

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

i-ASTER is a preliminary conceptual design of a high-field pulsed experimental stellarator aimed essentially at achieving and understanding plasma ignition. The averaged magnetic field on the axis of i-ASTER.v1 is B∼ 10 T and the plasma volume is 30 m3. A toroidal monolithic support structure, which is located externally to the modular coils, is defined to accurately arrange the coils and withstand the magnetic Lorentz forces from the high magnetic fields. The magnetic field in the coils and the resulting Lorentz forces on the coils were calculated and utilized for the stress calculation in monolithic support of constant thickness. Subsequently, a monolithic support of variable thickness is proposed and studied. The thickness of the structure is variable and adjusted to the magnitude of the mechanical stress in each area of the toroidal structure so as to smooth the stresses while minimizing the quantity of material used. A fabrication method for the monolithic structure has been tested. For that, a scaled-down mock-up of one period of stellarator has been additively manufactured and strengthened with fiber-reinforced resin. Unsurmountable difficulties have not been found for this fabrication method.

Original language	English
Article number	9007027
Pages (from-to)	1842-1848
Number of pages	7
Journal	IEEE Transactions on Plasma Science
Volume	48
Issue number	6
DOIs	https://doi.org/10.1109/TPS.2020.2972408
State	Published - Jun 2020

Funding

Manuscript received July 18, 2019; revised November 18, 2019; accepted February 3, 2020. Date of publication February 21, 2020; date of current version June 10, 2020. This work was supported in part by the Spanish Ministry of Economy and Competitiveness and in part by Fondo Europeo de Desarrollo Regional (FEDER EU) through the project “Study of Additive Manufacturing for the Application to High Performance Fusion Devices of Stellarator Type” under Contract ENE2015-64981-R. The review of this article was arranged by Senior Editor G. H. Neilson. (Corresponding author: Vicente Queral.) Vicente Queral, Esther Rincón, Santiago Cabrera, and Francisco Tabarés are with the National Fusion Laboratory, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), 28040 Madrid, Spain (e-mail: [email protected]; [email protected]; [email protected]; [email protected]).

Keywords

Additive manufacturing
coil
mechanical stress
monolithic support
stellarator

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10.1109/TPS.2020.2972408

Cite this

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title = "High-Field Ignition-Capable Stellarator i-ASTER: Initial Structural Evaluation",

abstract = "i-ASTER is a preliminary conceptual design of a high-field pulsed experimental stellarator aimed essentially at achieving and understanding plasma ignition. The averaged magnetic field on the axis of i-ASTER.v1 is B∼ 10 T and the plasma volume is 30 m3. A toroidal monolithic support structure, which is located externally to the modular coils, is defined to accurately arrange the coils and withstand the magnetic Lorentz forces from the high magnetic fields. The magnetic field in the coils and the resulting Lorentz forces on the coils were calculated and utilized for the stress calculation in monolithic support of constant thickness. Subsequently, a monolithic support of variable thickness is proposed and studied. The thickness of the structure is variable and adjusted to the magnitude of the mechanical stress in each area of the toroidal structure so as to smooth the stresses while minimizing the quantity of material used. A fabrication method for the monolithic structure has been tested. For that, a scaled-down mock-up of one period of stellarator has been additively manufactured and strengthened with fiber-reinforced resin. Unsurmountable difficulties have not been found for this fabrication method.",

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author = "Vicente Queral and Esther Rincon and Santiago Cabrera and Arnold Lumsdaine and Volpe, {Francesco A.} and Volpe, {Francesco A.} and Francisco Tabares",

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High-Field Ignition-Capable Stellarator i-ASTER: Initial Structural Evaluation

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