Array Structures for Field-Assisted Positron Moderation

摘要

#$%^&*AU2011100705A420110714.pdf#####1 ABSTRACT OF THE DISCLOSURE 2 Apparatus for the moderation of positrons may include a structure consisting of 3 linear or 2d arrays of electrode and semiconductor structures of generally planar or 4 cylindrical form with vacuum gaps between each element electrode. This structure is 5 contained within a vacuum chamber where a magnetic field is applied. The positron 6 source may be positioned adjacent to the moderator structure so that positrons from the 7 source implant into the moderator structure, or the cathode material may act as the 8 positron source by pair production through bombardment of high energy photons, 9 electrons or neutrons. Positrons from this source are implanted into the semiconductor 10 material and drift to the surface of the semiconductor through the influence of the electric 11 fields present produced by the electrodes. Positrons may be emitted from the surfaces of 12 the moderator material and are confined by orthogonal electric and magnetic fields while 13 they drift out from the vacuum gap between individual elements of the moderator structure 14 towards their intended use. 15 16 Ryan Weed, Joshua Machacek 10 June 2011