SE9702053D0 - Quadrupole gas detector - Google Patents

Abstract

The components of a gas detector of quadrupole type, such as shielding layers, collector, electrical through-connections, rods, etc., are minimized by being integrated into two ceramic blocks (1, 10) having intermediate rods (12) and through-connections and are joined by glass forming a compact unit. A bottom block (10) comprises a thicker base plate (16) having no recesses or holes, thereon a collector plate, including a shielding, and on the top a lens plate (18) including a shielding layer. The two latter plates have a set of similarly located holes (19, 20), through which the electrically conducting rods (12) for the quadrupoles pass with some play. The rods (12) are only at their end surfaces in contact with the other components such as at their lower ends to the base plate, where it is electrically connected to a conductor pattern. The lens plate (100) has additional holes for letting through ions between the rods (12). A top block (1) operates as input lens, ion chamber lens and ion chamber and has holes for letting through ions. The lower flat surface of the top blocks is directly secured to top end surfaces of the quadrupole rods (12). Between the blocks are in addition electrical connection rods provided. All plates are ceramic type and their different electric functions are provided by electrical conductor patterns on the surfaces thereof. The different parts are attached to each other by means of different types of glass joints also forming an isolation between electrically conducting regions. The play of the respective holes (19, 20) allows an accurate and simple positioning of the quadrupole rods when assembling the detector.