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123 results on '"Qiu, Yuefeng"'

1. Update of the 5 MW Beam-on-Target Requirements for improvement of the materials irradiation performance at IFMIF-DONES

Author

Podadera, Iván, Cara, Philippe, Álvarez-Castro, Irene, Anguiano, Marta, Arbeiter, Frederik, Becerril, Santiago, Bernardi, Davide, Castellanos, Jesús, Chauvin, Nicolas, Dézsi, Tamás, Díaz, Javier, Díez, Almudena, García, Mario, Gordeev, Sergej, Hernández, Rebeca, Luque, María, Macià, Llorenç, Maestre, Jorge, Mota, Fernando, Nitti, Francesco Saverio, Oliver, Concepción, Park, Jin-Hun, Poljak, Dragan, Prieto, Cayetano, Qiu, Yuefeng, Sánchez-Herranz, Daniel, Sanmartí, Manel, Serikov, Arkady, Serrano, Marta, Tadic, Tonci, Ternero, Marta, Torregrosa-Martin, Claudio, and Ibarra, Ángel

Published
2024
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20. Linear stability analysis of the electrostatic drift wave in the electron thermal internal transport barrier in EAST.

Author

Wang, Jie, Qiu, Yuefeng, and Wang, Shaojie

Subjects
*THERMAL electrons, *LINEAR statistical models, *ION temperature, *THERMAL instability, *FOURIER transforms, *RESONANCE effect, *COLLISION broadening, *SPECTRAL line broadening
Abstract

An alternative local electrostatic gyrokinetic eigenvalue code is developed for the ion-temperature-gradient-driven mode, the trapped-electron mode (TEM), and the electron-temperature-gradient (ETG)-driven mode. It numerically solves the linear eigenvalue problem for the electrostatic drift waves in the Fourier transformed space and benchmarks well with the HD-7 code and FULL code. The linear ETG and TEM instabilities in the electron thermal internal transport barrier (eITB) with dominant electron heating in experimental advanced superconducting tokamak are analyzed by using this code. The linear analysis results are consistent with that from the critical electron-temperature-gradient threshold analysis. Moreover, the sensitivity of ETG and TEM instabilities to parameters during the eITB formation has been investigated. For the typical eITB discharge, it is found that the instability of ETG mode is more sensitive to the stabilizing effect of the electron–ion temperature ratio (τe), while the instability of TEM is more sensitive to the destabilizing effect of η e . In addition, mixing length estimation of the turbulent transport in the eITB is also discussed, which suggests that the TEM may be saturated by other nonlinear effects than the resonance broadening. [ABSTRACT FROM AUTHOR]

Published
2024
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33. Linear gyrokinetic theory of two-dimensional ion-temperature-gradient mode in tokamaks.

Author

Qiu, Yuefeng, Wang, Jie, and Wang, Shaojie

Subjects
*TOKAMAKS, *PLASMA instabilities, *ION temperature, *TOROIDAL plasma, *EIGENVALUES
Abstract

The investigation of the two-dimensional (2D) linear ion-temperature-gradient (ITG) mode in toroidal plasma is carried out in ballooning mode representation. A novel approach to solve the radial envelope structure is proposed by constructing radial differential eigenequation. The important lemma (∂ ω / ∂ θ k) | θ k = 0 = 0 is proved and employed to construct a numerically solvable eigenequation. We have developed a numerical solver which gives the 2D solution consistent with the results obtained by the gyrokinetic global simulation code. Our newly proposed method presents an alternative solution to the 2D ITG eigenvalue problem. [ABSTRACT FROM AUTHOR]

Published
2024
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42. Commissioning Plan of the IFMIF-DONES Accelerator

Author

Podadera, Ivan, Aguilar, José, Arranz, Fernando, Becerril-Jarque, Santiago, Bellan, Luca, Bernardi, Davide, Bolzon, Benoit, Cara, Philippe, Castellanos, Jesus, Chauvin, Nicolas, Chel, Stéphane, Duglue, Daniel, Dézsi, Tamás, Ferreira, Marcelo, García, Mario, Hauer, Volker, Ibarra, Angel, Jimenez-Rey, David, Królas, Wojciech, Lehmann, Timo, Luque, Maria, Macià, Llorenç, Madur, Arnaud, Maestre, Jorge, Martins, Carlos, Micciché, Gioacchino, Mollá, Joaquin, Nitti, Francesco Saverio, Oliver, Concepcion, Palmieri, Antonio, Pisent, Andrea, Prieto, Cayetano, Qiu, Yuefeng, Regidor, David, Sanmartí, Manel, Singh, Bipin, Sánchez-Herranz, Daniel, Torregrosa, Claudio, Weber, Moisés, Wiacek, Urszula, De La Morena, Cristina, McIntosh, Peter, Burt, Graeme, Apsimon, Robert, and Schaa, Volker R. W.

Subjects
ddc:620, Proton and Ion Accelerators and Applications, Engineering & allied operations, Accelerator Physics
Abstract

IFMIF-DONES (International Fusion Materials Irradiation Facility- DEMO-Oriented Neutron Early Source) - a powerful neutron irradiation facility for studies and certification of materials to be used in fusion reactors - is planned as part of the European roadmap to fusion electricity. Its main goal will be to characterize and to qualify materials under irradiation in a neutron field similar to the one faced in a fusion reactor. The intense neutron source is produced by impinging deuterons, from high-power linear deuteron accelerator, on a liquid lithium curtain. The facility has accomplished the preliminary design phase and is currently in its detailed design phase. At the present stage, it is important to have a clear understanding of how the commissioning of the facility will be performed, especially the commissioning of a 5 MW CW deuteron beam, together with the lithium curtain and the beam optimization for the neutron irradiation. In this contribution, the present plans for the hardware and beam commissioning of the accelerator will be given, focusing on the most critical aspects of the tiered approach and on the integration of the procedure with the lithium and tests systems., Proceedings of the 31st International Linear Accelerator Conference, LINAC2022, Liverpool, UK

Published
2022

44. Potential Use of IFMIF-DONES Target Back-Plate for Material Specimens

Author

Qiu, Yuefeng, Arbeiter, Frederik, Bernardi, Davide, Frisoni, Manuela, Gordeev, Sergej, Hernández, Rebeca, and Serikov, Arkady

Subjects
SSTT, Technology, IFMIF-DONES, DPA, Eurofer, ddc:600, gas production, target
Abstract

In the IFMIF-DONES facility of the future, the back-plate behind the Li target will receive strong irradiation from high-energy neutrons. The potential use of the back-plate for material specimens is attractive with respect to providing complementary irradiation data for Eurofer. In this work, DPA (displacement per atom) and gas production rates as well as DPA gradients and temperature distributions have been studied for the center segment of the back-plate, using both a nominal beam and a reduced beam footprint. It is shown that specimens can be produced with high DPA in similar conditions to the DEMO first-wall. Based on the size of the SSTT (small specimen test technology) specimens, the limited number of samples obtainable from the adopted arrangement scheme is driven by a major constraint: the thickness of the back-plate. A parametric study of the back-plate’s thickness provides an alternative arrangement scheme; thus, the DPA and gradient of the specimens are remarkably improved.

Published
2022

46. Implementation of Safety Aspects in IFMIF-DONES Design.

Author

Martín-Fuertes, Francisco, Marugán, Juan Carlos, García, Antonio, Pinna, Tonio, Qiu, Yuefeng, Helminen, Atte, Potempski, Slawomir, Gallego, Eduardo, Ogando, Francisco, D'Ovidio, Gianluca, Pérez, Manuel, and Ibarra, Ángel

Subjects
FAILURE mode & effects analysis, FOOD irradiation, SYSTEM safety
Abstract

Integration of safety aspects in IFMIF-DONES design is a main objective of EUROfusion and European Commission projects. IFMIF-DONES will be a radioactive facility of the first category, and stringent safety objectives must be achieved and demonstrated. A very low acceptable risk for the worker, the public and the environment is the main principle in the design phase. The progress of safety activities is performed iteratively as detailed engineering develops, taking into account the uniqueness of the facility: a high-power deuterons accelerator (125 mA, 40 MeV), a target of flowing liquid lithium, traps for activation products, a dedicated-design module for irradiated samples, a massive shielding cooled room with confinement function, and a number of conventional systems with safety functions. Several phases are developed: (i) identification of sources and materials at risk, radioactive and nonradioactive, subject to potential mobilization, (ii) failure mode analysis and effects of systems, starting at the functional level, and support with probabilistic analysis, (iii) identification of scenarios leading to unacceptable risk if unmitigated, (iv) proposal of layers of defense by means of safety-credited components and design features, (v) deterministic analysis of scenarios in support of requirements, and (vi) definition and demonstration of safety requirements charged to components. [ABSTRACT FROM AUTHOR]

Published
2022
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