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

作者：Natisin M R^*; Danielson J R; Surko C M

来源：Applied Physics Letters, 2016, 108(2): 024102.

DOI：10.1063/1.4939854

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 50K 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 6.960.7 meV FWHM, which is a factor of similar to 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.

• 出版日期2016-1-11