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Title: A cryogenically cooled, ultra-high-energy-resolution, trap-based positron beam

A technique is described to produce a pulsed, magnetically guided positron beam with significantly improved beam characteristics over those available previously. A pulsed, room-temperature positron beam from a buffer gas trap is used as input to a trap that captures the positrons, compresses them both radially and axially, and cools them to 50 K on a cryogenic CO buffer gas before ejecting them as a pulsed beam. The total energy spread of the beam formed using this technique is 6.9 ± 0.7 meV FWHM, which is a factor of ∼5 better than the previous state-of-the-art, while simultaneously having sub-microsecond temporal resolution and millimeter spatial resolution. Possible further improvements in beam quality are discussed.
Authors:
; ;  [1]
  1. Department of Physics, University of California, San Diego, La Jolla, California 92093 (United States)
Publication Date:
OSTI Identifier:
22489308
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 108; Journal Issue: 2; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BUFFERS; CAPTURE; CARBON MONOXIDE; ENERGY RESOLUTION; POSITRON BEAMS; PULSES; SPATIAL RESOLUTION; TEMPERATURE RANGE 0273-0400 K