The Construction of a 200 KeV Electrostatic Accelerator
The original 200 keV electrostatic electron accelerator at Houghton College used a glass acceleration tube with external copper equipotential rings to provide the required uniform electric field along the length of the tube. Unfortunately, in this design stray electrons striking the walls of the tube caused charge to accumulate on the inside wall, eventually deflecting the electron beam. In order to solve this problem, a new design for the acceleration tube is being tested, made up of 51 pairs of alternating aluminum and plastic rings, with inside diameters 3.8 cm and 5.1 cm respectively. The differing inner radii of the rings ensure that the electrons will only strike the aluminum rings, and can therefore be removed as part of the coronal current flowing down the exterior column.
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