Positron extraction to an electromagnetic field free region
We describe a scheme for high efficiency (about 90%) extraction of 50 ns positron bunches from a buffer gas trap in an electromagnetic field free region. The positrons are time bunched to approximately 1 ns (FWHM) and focussed to less than 1 mm (σ). The target is kept at ground potential which is an advantage for many applications. The results compare well with SIMION simulations.
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