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CERN Document Server 24 record trovati  1 - 10successivofine  salta al record: La ricerca ha impiegato 0.59 secondi. 
1.
Investigation on different materials after pulsed high field conditioning and low-energy H- irradiation / Serafim, Catarina (CERN ; Helsinki U.) ; Peacock, R. (CERN) ; Calatroni, S. (CERN) ; Djurabekova, F. (Helsinki U.) ; Perez Fontenla, A.T. (CERN) ; Wuensch, W. (CERN) ; Sgobba, S. (CERN) ; Grudiev, A. (CERN) ; Lombardi, A. (CERN) ; Sargsyan, E. (CERN) et al.
During operation, the radio-frequency quadrupole (RFQ) of the LINAC4 at CERN is exposed to high electric fields, which can lead to vacuum breakdown. It is also subject to beam loss, which can cause surface modification, including blistering, which can result in reduced electric field holding and an increased breakdown rate. [...]
arXiv:2410.00084.- 2024-02-21 - 8 p. - Published in : Front. Phys. 12 (2024) 1308455 Fulltext: fphy-12-1308455 (3) - PDF; 2410.00084 - PDF;
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2.
Growth of Nb films on Cu for superconducting radio frequency cavities by direct current and high power impulse magnetron sputtering: A molecular dynamics and experimental study / Ghaemi, M (Helsinki Inst. of Phys.) ; Lopez-Cazalilla, A (Helsinki Inst. of Phys.) ; Sarakinos, K (Helsinki U. ; Royal Inst. Tech., Stockholm) ; Rosaz, G J (CERN) ; Carlos, C P A (CERN) ; Leith, S (CERN) ; Calatroni, S (CERN) ; Himmerlich, M (CERN) ; Djurabekova, F (Helsinki Inst. of Phys.)
The use of superconducting radio frequency (rf) cavities in particle accelerators necessitates that copper (Cu) surfaces are coated by thin niobium (Nb) films, predominantly synthesized by magnetron sputtering. A key feature of the rf cavities is that they exhibit a complex three-dimensional geometry, such that during Nb film growth vapor is not deposited on a flat substrate [...]
2024 - 11 p. - Published in : Surf. Coat. Technol. 476 (2024) 130199 Fulltext: PDF;
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3.
Punching of arbitrary face prismatic loops from hydrogen nanobubbles in copper / Lopez-Cazalilla, A (Helsinki U.) ; Djurabekova, F (Helsinki U.) ; Granberg, F (Helsinki U.) ; Mizohata, Kenichiro (Helsinki U.) ; Perez-Fontenla, Ana Teresa (CERN) ; Calatroni, Sergio (CERN) ; Wuensch, Walter (CERN)
When a metal surface is exposed to prolonged irradiation with energetic H−, the ions are expected to penetrate into bulk and dissolve in the matrix. However, the irradiated surfaces exhibit dramatic morphological changes in the form of “blisters” covering the surface exposed to irradiation. [...]
2022 - 12 p. - Published in : Acta Mater. 225 (2022) 117554 Fulltext: PDF;
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4.
Statistics of vacuum electrical breakdown clustering and the induction of follow-up breakdowns / Korsbäck, Anders (Helsinki U.) ; Djurabekova, Flyura (Helsinki U.) ; Wuensch, Walter (CERN)
Understanding the underlying physics of vacuum electrical breakdown is of relevance for the development of technologies where breakdown is of significance, either as an intended part of device operation or as a cause of failure. One prominent contemporary case of the latter is high-gradient linear accelerators, where structures must be able to operate with both high surface electric fields and low breakdown rates. [...]
2022 - 9 p. - Published in : AIP Adv. 12 (2022) 115317 Fulltext: PDF;
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5.
Microscopy Investigation on Different Materials After Pulsed High Field Conditioning and Low Energy H$^{-}$ Irradiation / Da Palma Serafim, Catarina (CERN ; U. Helsinki (main)) ; Bellodi, Giulia (CERN) ; Calatroni, Sergio (CERN) ; Djurabekova, Flyura (U. Helsinki (main)) ; Grudiev, Alexej (CERN) ; Lombardi, Alessandra (CERN) ; Peacock, Ruth (CERN) ; Perez Fontenla, Ana Teresa (CERN) ; Ramberger, Suitbert (CERN) ; Sargsyan, Edgar (CERN) et al.
During operation the RFQ (Radio-Frequency-Quadrupole) of the LINAC4 at CERN is exposed to high electric fields which can lead to vacuum breakdown. It is also subject to beam loss that can cause surface modification, including blistering, which can result in reduced electric field handling and an increased breakdown rate. [...]
2022 - 4 p. - Published in : JACoW LINAC 2022 (2022) 422-425 Fulltext: PDF;
In : 31st Linear Accelerator Conference (LINAC22), Liverpool, UK, 28 Aug - 2 Sep 2022, pp.422-425
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6.
Comparative study of H accumulation in differently oriented grains of Cu / Lopez-Cazalilla, A. (Helsinki U.) ; Serafim, Catarina (Helsinki U. ; CERN) ; Djurabekova, F. (Helsinki U.) ; Perez-Fontenla, Ana Teresa (CERN) ; Calatroni, Sergio (CERN) ; Wuensch, Walter (CERN)
When metal surfaces are exposed to hydrogen ion irradiation, the light ions are expected to penetrate deep into the material and dissolve in the matrix. [...]
arXiv:2209.14068. - 25 p.
Fulltext
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7.
In-situ plasma treatment of Cu surfaces for reducing the generation of vacuum arc breakdowns / Saressalo, Anton (Helsinki Inst. of Phys. ; Helsinki U.) ; Kilpeläinen, Aarre (Helsinki U.) ; Mizohata, Kenichiro (Helsinki U.) ; Profatilova, Iaroslava (CERN) ; Nolvi, Anton (Helsinki U.) ; Kassamakov, Ivan (Helsinki U.) ; Tikkanen, Pertti (Helsinki U.) ; Calatroni, Sergio (CERN) ; Wuensch, Walter (CERN) ; Djurabekova, Flyura (Helsinki Inst. of Phys.)
High electric fields are present in a rapidly growing number of applications, which include elementary particle accelerators, vacuum interrupters, miniature x-ray sources, and satellites. Many of these applications are limited by the breakdown strength of the materials exposed to electric fields. [...]
2021 - Published in : J. Appl. Phys. 130 (2021) 143302
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8.
Diffusion bonding of Cu atoms with molecular dynamics simulations / Xydou, A (CERN ; Patras U.) ; Parviainen, S (Helsinki U.) ; Djurabekova, F (Helsinki U. ; Moscow Phys. Eng. Inst.)
Diffusion bonding of copper disks is an important step during the assembly of accelerating structures -the main components of power radio-frequency linear accelerators-. During the diffusion bonding copper disks are subjected to pressure at high temperatures. [...]
2020 - 8 p. External link: Fulltext from publisher
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9.
Effect of dc voltage pulsing on high-vacuum electrical breakdowns near Cu surfaces / Saressalo, Anton (Helsinki Inst. of Phys.) ; Profatilova, Iaroslava (ECFA) ; Millar, William L. (CERN ; Cockcroft Inst. Accel. Sci. Tech.) ; Kyritsakis, Andreas (Helsinki Inst. of Phys.) ; Calatroni, Sergio (CERN) ; Wuensch, Walter (CERN) ; Djurabekova, Flyura (Helsinki Inst. of Phys.)
Vacuum electrical breakdowns, also known as vacuum arcs, are a limiting factor in many devices that are based on application of high electric fields near their component surfaces. Understanding of processes that lead to breakdown events may help mitigating their appearance and suggest ways for improving operational efficiency of power-consuming devices. [...]
arXiv:2008.02130.- 2020-11-09 - 14 p. - Published in : Phys. Rev. Accel. Beams 23 (2020) 113101 Fulltext: PDF; Fulltext from Publisher: PDF; Fulltext from publisher: PDF;
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10.
Dynamic coupling between particle-in-cell and atomistic simulations / Veske, Mihkel (Helsinki U. ; Helsinki Inst. of Phys.) ; Kyritsakis, Andreas (Helsinki U.) ; Sjobak, Kyrre Ness (CERN ; Oslo U.) ; Zadin, Vahur (Tartu U.) ; Aabloo, Alvo (Tartu U.) ; Djurabekova, Flyura (Helsinki U.)
We propose a method to directly couple molecular dynamics, finite element method and particle-in-cell techniques to simulate metal surface response to high electric fields. We use this method to simulate the evolution of a field emitting tip under thermal runaway by fully including the 3D space-charge effects [...]
arXiv:1906.08125.- 2020 - 16 p. - Published in : Phys. Rev. E 101 (2020) 053307 Fulltext: PDF;
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CERN Document Server : 24 record trovati   1 - 10successivofine  salta al record:
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4 Djurabekova, F.
13 Djurabekova, Flyura
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