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1.
Identifying critical plastic activity in electrodes under intense electric fields and the link to breakdown nucleation / Ashkenazy, Yinon (Hebrew U.) ; Popov, Inna (Hebrew U.) ; Yashar, Ayelet (Hebrew U.) ; Gad, Raanan (Hebrew U.) ; Profatilova, Iaroslava (CERN) ; Paszkiewicz, Jan (CERN) ; Peacock, Ruth (CERN) ; Wuensch, Walter (CERN)
The hypothesis that arc nucleation is related to plastic activity due to collective motion of dislocation in the cathode is examined via experiments and theoretical efforts over the last few years. Current theoretical and experimental observations indicating specific dislocation activity related to the applied high field are reviewed. [...]
2021 - 2 p. - Published in : 10.1109/ISDEIV46977.2021.9586897
In : 29th International Symposium on Discharges and Electrical Insulation in Vacuum, Online, 26 - 30 Sep 2021, pp.1-2
2.
Dark current spikes as an indicator of mobile dislocation dynamics under intense dc electric fields / Engelberg, Eliyahu Zvi (Hebrew U.) ; Paszkiewicz, Jan (CERN) ; Peacock, Ruth (CERN) ; Lachmann, Sagy (Hebrew U.) ; Ashkenazy, Yinon (Hebrew U.) ; Wuensch, Walter (CERN)
Breakdown of metals subject to intense electric fields is a long-standing limiting factor in high-voltage applications. The mechanism leading to breakdown nucleation is not completely understood. [...]
2020 - 9 p. - Published in : Phys. Rev. Accel. Beams 23 (2020) 123501 Fulltext: PDF;
3.
Statistical Analysis of Field-Emission Currents / Lachmann, Sagy (Hebrew U.) ; Jacewicz, Marek (Uppsala U.) ; Profatilova, Iaroslava (CERN) ; Paszkiewicz, Jan (CERN) ; Wuensch, Walter (CERN) ; Ashkenazy, Yinon (Hebrew U.)
The current due to cold tunneling of electrons from a metallic surface exposed to high electric fields, regularly named “dark current,” is commonly described in modern literature using an analytical approximate solution provided by Murphy and Good [Phys. Rev. [...]
2021 - 11 p. - Published in : Phys. Rev. Applied 16 (2021) 024007 Fulltext: PDF;
4.
Investigation of Vacuum Breakdown in Pulsed DC Systems / Kaufmann, Helena T C (Madeira U. ; Lisbon, IST) ; Profatilova, Iaroslava (CERN) ; Popov, Inna (Hebrew U.) ; Wuensch, Walter (CERN) ; Benilov, Mikhail S (Madeira U. ; Lisbon, IST)
Vacuum breakdown in the pulsed DC experiment at CERN was investigated by means of electrical measurements, SEM and STEM imaging of the surface and cross sections of the copper electrodes, and numerical modeling. The breakdown sites comprise one or more craters. [...]
2021 - 4 p. - Published in : 10.1109/ISDEIV46977.2021.9587237
In : 29th International Symposium on Discharges and Electrical Insulation in Vacuum, Online, 26 - 30 Sep 2021, pp.19-22
5.
Studies of Breakdown and Pre-Breakdown Phenomena in High Gradient Accelerating Structures / Paszkiewicz, Jan
Vacuum breakdown is a complex process and an important limiting factor of the performance of normal-conducting high-gradient particle accelerators, and can result in loss of luminosity in particle collider applications, as well as damage to accelerating structures [...]
CERN-THESIS-2020-260 - 237 p.

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;
7.
Breakdown localisation in a pulsed DC electrode system / Profatilova, Iaroslava (CERN) ; Stragier, Xavier (CERN ; Eindhoven, Tech. U.) ; Calatroni, Sergio (CERN) ; Kandratsyeu, Aleh (Lisbon, CFTP) ; Rodriguez Castro, Enrique (CERN) ; Wuensch, Walter (CERN)
Breakdown localisation is an important diagnostic for studies of vacuum arcs in high electromagnetic field systems such as DC electrodes and radio frequency (RF) accelerating structures. For example, determining the position of individual breakdowns and corresponding distributions of ensembles of breakdowns are important measurements in high-gradient X-band test stands (CERN, SLAC, KEK) where these measurements are made by monitoring the RF signals.A highly precise breakdown localisation technique has been developed for the CLIC (Compact LInear Collider) pulsed DC electrode systems. [...]
2020 - 9 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 953 (2020) 163079 Fulltext: PDF;
8.
DC Breakdown Experiments with Iridium Cathode / Profatilova, Iaroslava (Sumy, Inst. Appl. Phys.) ; Calatroni, Sergio (CERN) ; Korsback, Anders (CERN) ; Muranaka, Tomoko (CERN) ; Wuensch, Walter (CERN)
Electrical breakdown occurring in rf accelerating structures is one of the major disruptions of the accelerated beam in CLIC. [...]
CERN-ACC-2015-0061 ; CLIC-Note-1052.
- 2015 - 5.
Full text
9.
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
10.
Orthogonal forms and transition probability in von Neumann algebras / Goldstein, S ; Paszkiewicz, A
BiBoS-418.
- 1990. - 14 p.
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