Surface Electrical Leakage on Insulators and Coatings in the Presence of Moisture Condensation

Baker, Hayward R.; Bolster, R.N.

doi:10.1109/tei.1976.297902

Cited by 17 publications

(3 citation statements)

References 5 publications

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“…The decrease in resistivity of insulators due to moisture has been documented in the literature in the past century (see, e.g., [46][47][48]). In a humid environment, current is conducted along insulator surfaces, where there is a layer of moisture from the ambient air.…”

Section: Leakage Current: Mitigationmentioning

confidence: 99%

In-situ measurements of the secondary electron yield in an accelerator environment: Instrumentation and methods

Hartung

Asner

Conway

et al. 2015

Nuclear Instruments and Methods in Physics Research Section A:

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The performance of a particle accelerator can be limited by the build-up of an electron cloud (EC) in the vacuum chamber. Secondary electron emission from the chamber walls can contribute to EC growth. An apparatus for in-situ measurements of the secondary electron yield (SEY) in the Cornell Electron Storage Ring (CESR) was developed in connection with EC studies for the CESR Test Accelerator program. The CESR in-situ system, in operation since 2010, allows for SEY measurements as a function of incident electron energy and angle on samples that are exposed to the accelerator environment, typically 5.3 GeV counter-rotating beams of electrons and positrons. The system was designed for periodic measurements to observe beam conditioning of the SEY with discrimination between exposure to direct photons from synchrotron radiation versus scattered photons and cloud electrons. The samples can be exchanged without venting the CESR vacuum chamber. Measurements have been done on metal surfaces and EC-mitigation coatings. The in-situ SEY apparatus and improvements to the measurement tools and techniques are described.

show abstract

Section: Leakage Current: Mitigationmentioning

confidence: 99%

In-situ measurements of the secondary electron yield in an accelerator environment: Instrumentation and methods

Hartung

Asner

Conway

et al. 2015

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

show abstract

“…The decrease in resistivity of insulators due to moisture has been extensively documented in the literature in the past century (see, for example, Refs. [54][55][56]). In a humid environment, current is conducted along the surface of an insulator, where there is a layer of moisture from the ambient air.…”

Section: Leakage Current: Mitigationmentioning

confidence: 99%

Report on Instrumentation and Methods for In-Situ Measurements of the Secondary Electron Yield in an Accelerator Environment

Hartung,

Asner,

Conway

et al. 2014

Preprint

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The achievable beam current and beam quality of a particle accelerator can be limited by the build-up of an electron cloud (EC) in the vacuum chamber. Secondary electron emission from the walls of the vacuum chamber can contribute to the growth of the electron cloud. An apparatus for in-situ measurements of the secondary electron yield (SEY) of samples in the vacuum chamber of the Cornell Electron Storage Ring (CESR) has been developed in connection with EC studies for the CESR Test Accelerator program (CesrTA). The CesrTA in-situ system, in operation since 2010, allows for SEY measurements as a function of incident electron energy and angle on samples that are exposed to the accelerator environment, typically 5.3 GeV counter-rotating beams of electrons and positrons. The system was designed for periodic measurements to observe beam conditioning of the SEY with discrimination between exposure to direct photons from synchrotron radiation versus scattered photons and cloud electrons. The SEY chambers can be isolated from the CESR beam pipe, allowing us to exchange samples without venting the CESR vacuum chamber. Measurements so far have been on metal surfaces and EC-mitigation coatings. The goal of the SEY measurement program is to improve predictive models for EC build-up and EC-induced beam effects. This report describes the CesrTA in-situ SEY apparatus, the measurement tool and techniques, and iterative improvements therein.

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“…Relations between wettability and flashover voltage are now being studied. Baker and Bolster (151,152) present two studies, of behavior of condensed water on surfaces generally as the foregoing work, and on the effect of various formulations applied to dry off the surface and improve insulation resistance on further wetting; some are highly effective, and are also beneficial to metal components as lubricants and corrosion inhibitas.…”

mentioning

confidence: 99%

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Cameron¹

1976

Digest of Literature on Dielectrics Volume 40 1976

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Surface Electrical Leakage on Insulators and Coatings in the Presence of Moisture Condensation

Cited by 17 publications

References 5 publications

In-situ measurements of the secondary electron yield in an accelerator environment: Instrumentation and methods

In-situ measurements of the secondary electron yield in an accelerator environment: Instrumentation and methods

Report on Instrumentation and Methods for In-Situ Measurements of the Secondary Electron Yield in an Accelerator Environment

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