Surface flashover of insulators

Miller, H. Craig

doi:10.1109/14.42158

Cited by 475 publications

(134 citation statements)

References 61 publications

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“…When an electron beam impacts on a dielectric film, the potential drop along the beam profile (75 kV for the Dragon-I beam) will be large enough to cause flashover along the surface. The physics of the surface flashover has been studied intensively in the past, and the final stage of the flashover in such a case was believed to be discharge through the desorbed gas along the dielectric surface [10]. During the discharge, a large amount of plasma will be produced, which will provide a copious source of positive ions.…”

Section: Experiments On the Dragon-i Liamentioning

confidence: 99%

Back-streaming ion emission and beam focusing on high power linear induction accelerator

Zhu

Chen

et al. 2011

Phys. Rev. ST Accel. Beams

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Ions released from target surfaces by impact of a high intensity and current electron beam can be accelerated and trapped in the beam potential, and further destroy the beam focus. By solving the 2D Poisson equation, we found that the charge neutralization factor of the ions to the beam under space charge limited condition is 1=3, which is large enough to disrupt the spot size. Therefore, the ion emission at the target in a single-pulse beam/target system must be source limited. Experimental results on the time-resolved beam profile measurement have also proven that. A new focus scheme is proposed in this paper to focus the beam to a small spot size with the existence of back-streaming ions. We found that the focal spot will move upstream as the charge neutralization factor increases. By comparing the theoretical and experimental focal length of the Dragon-I accelerator (20 MeV, 2.5 kA, 60 ns flattop), we found that the average neutralization factor is about 5% in the beam/target system.

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Section: Experiments On the Dragon-i Liamentioning

confidence: 99%

Back-streaming ion emission and beam focusing on high power linear induction accelerator

Zhu

Chen

et al. 2011

Phys. Rev. ST Accel. Beams

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“…Surface flashover of insulators in vacuum is generally the limiting factor in the design of high voltage vacuum devices. The most widely-accepted theory of surface flashover holds that --an avalanche of secondary electrons occurs along the insulator surface, desorbing gas through which the breakdown occurs [4][5][6][7]. The HGI overcomes the flashover by inhibiting the breakdown process using closely-spaced, floating conductors, encapsulated in a dielectric.…”

Section: High-gradient Insulatormentioning

confidence: 99%

Engineering Prototype for a Compact Medical Dielectric Wall Accelerator

Zografos¹,

Hening²,

Joshkin³

et al. 2011

AIP Conference Proceedings

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“…Indeed, the initial stage of the surface flashover is the development of a saturated SEE avalanche. 15 The SEE avalanche is assumed saturated if the current of avalanching electrons to the surface is equal to the outgoing current of secondary electrons, or when the total yield of SEE ␦ϭ1 is realized.…”

Section: Secondary Electron Emission From Ferroelectricsmentioning

confidence: 99%

Operation of Ferroelectric Plasma Sources in a Gas Discharge Mode

Dunaevsky¹,

Fisch²

2004

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Surface flashover of insulators

Cited by 475 publications

References 61 publications

Back-streaming ion emission and beam focusing on high power linear induction accelerator

Back-streaming ion emission and beam focusing on high power linear induction accelerator

Engineering Prototype for a Compact Medical Dielectric Wall Accelerator

Operation of Ferroelectric Plasma Sources in a Gas Discharge Mode

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