Publication

Measurements of particulate contamination and migration under vacuum using a large sensitive area particle counter

Jean-Luc Dorier
1999
Journal Articles

Abstract

A large area (50 cm(2)) particle counter working under vacuum (10(-7) mbar) has been developed at CERN and applied to measurements of particles released by several vacuum components like valves, gauges and ion pumps. This technique has also been applied to study the migration of particles under vacuum with and without an applied electric field. This counter, which is based on the scattering of laser light by particles, is described with comments on the technical choices. The results of the contamination released by vacuum components and the effects of an electric field will be presented. (C) 1999 Elsevier Science Ltd. All rights reserved.

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https://infoscience.epfl.ch/entities/publication/781a4552-250f-48d3-93aa-2cf308b0e7c5

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Jean-Luc Dorier
1999
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/781a4552-250f-48d3-93aa-2cf308b0e7c5

About this result

Related concepts (32)

Electric field

An electric field (sometimes E-field) is the physical field that surrounds electrically charged particles and exerts force on all other charged particles in the field, either attracting or repelling them. It also refers to the physical field for a system of charged particles. Electric fields originate from electric charges and time-varying electric currents. Electric fields and magnetic fields are both manifestations of the electromagnetic field, one of the four fundamental interactions (also called forces) of nature.

Electromagnetic field

An electromagnetic field (also EM field or EMF) is a classical (i.e. non-quantum) field produced by moving electric charges. It is the field described by classical electrodynamics (a classical field theory) and is the classical counterpart to the quantized electromagnetic field tensor in quantum electrodynamics (a quantum field theory). The electromagnetic field propagates at the speed of light (in fact, this field can be identified as light) and interacts with charges and currents.

Electric displacement field

In physics, the electric displacement field (denoted by D) or electric induction is a vector field that appears in Maxwell's equations. It accounts for the electromagnetic effects of polarization and that of an electric field, combining the two in an auxiliary field. It plays a major role in topics such as the capacitance of a material, as well the response of dielectrics to electric field, and how shapes can change due to electric fields in piezoelectricity or flexoelectricity as well as the creation of voltages and charge transfer due to elastic strains.

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Measurements of particulate contamination and migration under vacuum using a large sensitive area particle counter

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