A High-Brightness Source for Polarized Atomic Hydrogen and Deuterium

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An atomic beam source for polarized hydrogen and deuterium is described. The source, which will be used to supply atoms to a polarized gas target cell for internal-target experiments in storage rings, was designed to optimize the flux of polarized atoms into a 1 cm diameter 13 cm long tube placed 26 cm from the end of the last magnet. High-field permanent magnet sixpoles with a tapered bore are employed. Studies of gas scattering and dissociator output were combined with ray tracing calculations of atomic trajectories to find an optimum source design. The beam is cooled by thermal accomodation to an aluminum dissociator nozzle at 84 K. The beam intensity which passes through the 1 cm diameter, 13 cm long tube is (6.7 ± 0.1) × 1016 atoms/s. The total hydrogen beam intensity is 8.6 × 1016 atoms/s in two hyperfine spin states. The measured beam profile and intensity agree with calculations to within 10%.


Physics and Astronomy

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Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment