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CERN Document Server 2,048 records found  1 - 10próximoend  jump to record: Search took 1.99 seconds. 
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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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(91)
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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3.
(26)
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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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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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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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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(8)
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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Role of iodine oxoacids in atmospheric aerosol nucleation / He, Xu-Cheng (Helsinki U.) ; Tham, Yee Jun (Helsinki U.) ; Dada, Lubna (Helsinki U.) ; Wang, Mingyi (Carnegie Mellon U.) ; Finkenzeller, Henning (U. Colorado, Boulder) ; Stolzenburg, Dominik (Vienna U. ; Helsinki U.) ; Iyer, Siddharth (Tampere U. of Tech.) ; Simon, Mario (Frankfurt U., FIAS) ; Kürten, Andreas (Frankfurt U., FIAS) ; Shen, Jiali (Helsinki U.) et al.
Iodic acid (HIO3) is known to form aerosol particles in coastal marine regions, but predicted nucleation and growth rates are lacking. Using the CERN CLOUD (Cosmics Leaving Outdoor Droplets) chamber, we find that the nucleation rates of HIO3 particles are rapid, even exceeding sulfuric acid–ammonia rates under similar conditions. [...]
2021 - 7 p. - Published in : Science 371 (2021) 589-595
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(8)
Publisher Correction: The observation of vibrating pear-shapes in radon nuclei [doi: 10.1038/s41467-019-10494-5] / Butler, P A (Liverpool U.) ; Gaffney, L P (Liverpool U. ; CERN) ; Spagnoletti, P (West Scotland U.) ; Konki, J (CERN) ; Scheck, M (West Scotland U.) ; Smith, J F (West Scotland U.) ; Abrahams, K (Western Cape U.) ; Bowry, M (TRIUMF) ; Cederkäll, J (Lund U.) ; Chupp, T et al.
An amendment to this paper has been published and can be accessed via a link at the top of the paper..
2020 - 1 p. - Published in : Nature Commun. 11 (2020) 5185
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Addendum: The observation of vibrating pear-shapes in radon nuclei / Butler, P A (Liverpool U.) ; Gaffney, L P (Liverpool U. ; CERN) ; Spagnoletti, P (West Scotland U.) ; Konki, J (CERN) ; Scheck, M (West Scotland U.) ; Smith, J F (West Scotland U.) ; Abrahams, K (Western Cape U.) ; Bowry, M (TRIUMF) ; Cederkäll, J (Lund U.) ; Chupp, T (Michigan U.) et al.
2020 - Published in : Nature Commun. 11 (2020) 3560 Fulltext: PDF; External link: Fulltext from publisher
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