CHARGING, INITIAL ACCELERATION AND DETECTION OF MICRON DIAMETER PARTICLES
Abstract
One method by which small particles may be accelerated to high-velocities is to charge the particles electrically and then accelerate them through a high voltage such as that produced by a Van de Graaff generator. Besides producing a high voltage, the chief problems met in electrostatic acceleration are those concerned with handling the particles, placing a charge on them, maximizing their charge-to-mass ratio and measuring particle size and velocit . A system to solve these problems is developed. A measure of the over-all effectiveness of the charging system is given by the particle charge-to-mass ratio since this determines the velocity which can be attained. It was found that for carbonyl-iron spheres of 0.2 to 1.1-micron radius, the attainable charge to mass ratio is given by the expression 6.13 times 10 to the -6th power quantity divided by r, where q is charge, m is mass and r is particle radius. M.K.S. units are used. It is believed that this represents close to the practical maximum value attainable using contact charging and that the limit is imposed by electrical stresses in the particle surface causing surface disruption and ion emission. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 05, 1961
- Accession Number
- AD0270047
Entities
People
- D.r. Harrison
- E.p. Palmer
- R.w. Grow
Organizations
- University of Utah