The polarized H and D atomic beam source for ANKE at COSY-Jülich $

Abstract A polarized atomic beam source was developed for the polarized internal storage-cell gas target at the magnet spectrometer ANKE of COSY-Julich. The intensities of the beams injected into the storage cell, measured with a compression tube, are 7.5 × 10 16 hydrogen atoms/s (two hyperfine states) and 3.9 × 10 16 deuterium atoms/s (three hyperfine states). For the hydrogen beam the achieved vector polarizations are p z ≈ ± 0.92 . For the deuterium beam, the obtained combinations of vector and tensor ( p zz ) polarizations are p z ≈ ± 0.90 (with a constant p zz ≈ + 0.86 ), and p zz =+ 0.90 or p zz = − 1.71 (both with vanishing p z ). The paper includes a detailed technical description of the apparatus and of the investigations performed during the development. This source has been very successfully used for single and double polarization measurements at ANKE as well as for studies of the polarization of recombining hydrogen molecules.