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A cryogenically cooled, ultra-high-energy-resolution, trap-based positron beam
Ist Teil von
Applied physics letters, 2016-01, Vol.108 (2)
Ort / Verlag
Melville: American Institute of Physics
Erscheinungsjahr
2016
Link zum Volltext
Quelle
American Institute of Physics
Beschreibungen/Notizen
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.