Modular low-voltage electron emitters

Abstract

Modular, low-voltage electron emitters simplify electron beam (EB) technology for many industrial uses and for research and development. Modular electron emitters are produced in quantity as sealed systems that are evacuated at the factory, eliminating the need for vacuum pumps at the point of use. A plug-out–plug-in method of replacement facilitates servicing. By using an ultra-thin 6–7μm titanium foil window, solid-state power supplies, an innovative design to extract and spread the beam (enabling systems to be placed adjacent to each other to extend beam width) and touch-screen computer controls, these modular units combine ease of use and electrical transfer efficiency at voltages that can be varied between 80kV and 150kV with beam currents up to 40mA per 25cm across the beam window. These new devices have been made in three widths: 5cm, 25cm, and 40cm. Details of the beam construction and illustrations of industrial uses will be presented. Traditional uses in the graphic arts and coatings areas have welcomed this modular technology as well as uses for surface sterilization. Being compact and lightweight (∼15kg/emitter), these modular beams have been configured around complex shapes to achieve three-dimensional surface curing at high production rates.