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CERN Document Server Sök i 12 journaler efter:  1 - 10nästa  gå till journal: Sökningen tog 0.55 sekunder. 
1.
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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2.
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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3.
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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4.
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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5.
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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6.
Classification of vacuum arc breakdowns in a pulsed DC system / Saressalo, Anton (Helsinki Inst. of Phys. ; Helsinki U.) ; Profatilova, Iaroslava (CERN) ; Kyritsakis, Andreas (Helsinki Inst. of Phys. ; Helsinki U.) ; Paszkiewicz, Jan (CERN) ; Calatroni, Sergio (CERN) ; Wuensch, Walter (CERN) ; Djurabekova, Flyura (Helsinki Inst. of Phys. ; Helsinki U.)
Understanding the microscopic phenomena behind vacuum arc ignition and generation is crucial for being able to control the breakdown rate, thus improving the effectiveness of many high-voltage applications where frequent breakdowns limit the operation. In this work, statistical properties of various aspects of breakdown, such as the number of pulses between breakdowns, breakdown locations and crater sizes are studied independently with almost identical Pulsed DC Systems at the University of Helsinki and in CERN. [...]
arXiv:1911.05192.- 2020-02-12 - 11 p. - Published in : Phys. Rev. Accel. Beams.: 23 (2020) , pp. 023101
- Published in : Phys. Rev. Accel. Beams: 23 (2020) , pp. 023101 Fulltext: PDF; Fulltext from Publisher: PDF;
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7.
Vacuum electrical breakdown conditioning study in a parallel plate electrode pulsed DC system / Korsbäck, Anders (Helsinki Inst. of Phys.) ; Morales, Laura Mercadé (Valencia U.) ; Profatilova, Iaroslava (Sumy, Inst. Appl. Phys.) ; Djurabekova, Flyura (Helsinki Inst. of Phys.) ; Rodriguez Castro, Enrique (CERN) ; Wuensch, Walter (CERN) ; Ahlgren, Tommy (Helsinki U.) ; Calatroni, Sergio (CERN)
Conditioning of a metal structure in a high-voltage system is the progressive development of resistance to vacuum arcing over the operational life of the system. This is, for instance, seen during the initial operation of radio frequency (rf) cavities in particle accelerators. [...]
arXiv:1905.03996.- 2020-03-23 - 13 p. - Published in : Phys. Rev. Accel. Beams 23 (2020) 033102 Fulltext: PDF; Fulltext from Publisher: 66bd5bb19bab82f5bf87f53d0397d3b0 - PDF; 10.1103_PhysRevAccelBeams.23.033102 - PDF; Fulltext from publisher: PDF;
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8.
Nuclear stopping power of antiprotons / Nordlund, Kai (Helsinki Inst. of Phys.) ; Sundholm, Dage (Helsinki U.) ; Pyykkö, Pekka (Helsinki U.) ; Martinez Zambrano, Daniel (Northwestern U. ; CERN) ; Djurabekova, Flyura (Helsinki Inst. of Phys.)
The slowing down of energetic ions in materials is determined by the nuclear and electronic stopping powers. Both of these have been studied extensively for ordinary-matter ions. [...]
2017 - 15 p. - Published in : Phys. Rev. A 96 (2017) 042717 Fulltext: PDF;
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9.
Statistics of vacuum breakdown in the high-gradient and low-rate regime / Wuensch, Walter (CERN) ; Degiovanni, Alberto (CERN) ; Calatroni, Sergio (CERN) ; Korsbäck, Anders (Helsinki Inst. of Phys.) ; Djurabekova, Flyura (Helsinki Inst. of Phys.) ; Rajamäki, Robin (Aalto U.) ; Giner-Navarro, Jorge (Valencia U., IFIC)
In an increasing number of high-gradient linear accelerator applications, accelerating structures must operate with both high surface electric fields and low breakdown rates. Understanding the statistical properties of breakdown occurrence in such a regime is of practical importance for optimizing accelerator conditioning and operation algorithms, as well as of interest for efforts to understand the physical processes which underlie the breakdown phenomenon. [...]
2017 - 11 p. - Published in : Phys. Rev. Accel. Beams 20 (2017) 011007 Fulltext: PDF;
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10.
DC breakdown experiments with cobalt electrodes / Descoeudres, Antoine (CERN) ; Djurabekova, Flyura (Helsinki Inst. of Phys. ) ; Nordlund, Kai (Helsinki Inst. of Phys. )
RF accelerating structures of the Compact Linear Collider (CLIC) require a material capable of sustaining high electric field with a low breakdown rate and low induced damage [...]
CERN-OPEN-2011-029 ; CLIC-Note-875. - 2009 - 6.
Preprint
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