Open Access
Breakdown Studies for the CLIC Accelerating Structures
Sergio Calatroni,Antoine Descoeudres,J W Kovermann,Mauro Taborelli,Helga Timko,Walter Wuensch,Flyura Djurabekova,Kai Nordlund,Aarne Pohjonen,Antti Kuronen +9 more
- 01 Jan 2010
- pp 217-219
TL;DR: In this paper, a detailed understanding of all the steps involved in the mechanism of breakdown is presented, including surface modification under RF fields, electron emission and neutral evaporation in the vacuum, arc ignition and consequent surface modification due to plasma bombardment.
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Abstract: Optimizing the design and the manufacturing of the CLIC RF accelerating structures for achieving the target value of breakdown rate at the nominal accelerating gradient of 100 MV/m requires a detailed understanding of all the steps involved in the mechanism of breakdown. These include surface modification under RF fields, electron emission and neutral evaporation in the vacuum, arc ignition and consequent surface modification due to plasma bombardment. Together with RF tests, experiments are conducted in a simple DC test set-up instrumented with electrical diagnostics and optical spectroscopy. The results are also used for validating simulations which are performed using a wide range of numerical tools (MD coupled to electrostatic codes, PIC plasma simulations) able to include all the above phenomena. Some recent results are presented in this paper.
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Citations
Modelling vacuum arcs: from plasma initiation to surface interactions
Helga Timko
- 10 Dec 2011
TL;DR: In this article, a particle-in-cell (PIC) model of the arc plasma, and molecular dynamics (MD) simulations of the subsequent surface damaging mechanism are presented.
Short pulse dielectric strength of vacuum gaps with different electrode materials
S. A. Onischenko,A. S. Grenadyorov,K. V. Oskomov,E. V. Nefedtsev,Alexander V. Batrakov +4 more
- 01 Sep 2016
TL;DR: In this article, the short pulse electric strength (SPES) of a millimeter plane-parallel vacuum gap depends on the properties of electrode materials such as microhardness, work function, and crystallographic structure.
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A 12 kV, 1 kHz, Pulse Generator for Breakdown Studies of Samples for CLIC RF Accelerating Structures
Rudi Soares,Michael Barnes,Sergio Calatroni,J.W.Kovermann,W. Wuensch +4 more
- 01 Aug 2012
TL;DR: In this paper, a high repetition rate pulse generator has been designed, built and tested; this utilizes pulse forming line technology and employs MOSFET switches, and the design of the pulse generator and presents measurement results.
•Posted Content
Molecular dynamics simulations of surface modification formations on polycrystalline Cu under high electric fields
TL;DR: In this paper, the authors conduct molecular dynamics simulations of nanocrystalline copper surfaces and show the possibility of protrusion growth under the stress exerted on the surface by an applied electrostatic field.
2
Multiscale-multiphysics modelling of metal surfaces
Mihkel Veske
- 11 Oct 2019
TL;DR: In this article, the shape memory effect and spontaneous reorientation were investigated in the case of Cu nanoprotrusions under a high electric field, and a multiscale multiphysics tool was developed to combine molecular dynamics, finite element method and particle-in-cell techniques.
1
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