Observation of pre-breakdown emission sites and breakdowns of vacuum gaps under short-pulsed testing

Nefyodtsev, E. V.; Onischenko, S. A.; Proskurovsky, D.I.; Batrakov, A. V.

doi:10.1109/tdei.2011.5931083

Cited by 14 publications

(2 citation statements)

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“…Nefyodtsev et al [25] found that about half of all breakdowns create new field emission sites in their vicinity, and that these sites often cause further breakdowns. This provides a mechanism for the two types of breakdowns and the spatio-temporal correlation of breakdown that we have identified.…”

Section: Comparison With Other Studiesmentioning

confidence: 99%

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Statistics of vacuum breakdown in the high-gradient and low-rate regime

Wuensch

Degiovanni

Calatroni

et al. 2017

Phys. Rev. Accel. Beams

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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. Experimental data of breakdown has been collected in two distinct high-gradient experimental setups: A prototype linear accelerating structure operated in the Compact Linear Collider Xbox 12 GHz test stands, and a parallel plate electrode system operated with pulsed DC in the kV range. Collected data is presented, analyzed and compared. The two systems show similar, distinctive, two-part distributions of number of pulses between breakdowns, with each part corresponding to a specific, constant event rate. The correlation between distance and number of pulses between breakdown indicates that the two parts of the distribution, and their corresponding event rates, represent independent primary and induced follow-up breakdowns. The similarity of results from pulsed DC to 12 GHz rf indicates a similar vacuum arc triggering mechanism over the range of conditions covered by the experiments.

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Section: Comparison With Other Studiesmentioning

confidence: 99%

“…When they instead applied a steadily rising DC level, they obtained only one Weibull distribution consistently with most other studies. Nefyodtsev et al [25] studied pre-breakdown field emission of electrons from the cathode surface. They observed and mapped emission current densities and localized breakdowns.…”

Section: Introductionmentioning

confidence: 99%