Internal polarized deuterium target with cryogenic atomic beam source

摘要

Description of the polarized deuterium gas target used at the VEPP-3 electron storage ring for experiments on elastic and inelastic ed scattering is given. Superconducting sextupole magnets with the pole tip magnetic field up to 4.8 T are used in atomic beam source (ABS) to focus atoms. The flux of polarized atoms injected into the storage cell was measured to be 8.2 x 10~(16) at/s for deuterium and 7.9 x 10~(16) at/s for hydrogen. The measured target thickness 8 x 10~(13) at/cm~2 is consistent with the thickness calculated from the measured beam intensity. The effective tensor polarization of the deuterium target during the experiment was found to be P_(zz) = 0.397. Further improvements of the target and possible limitation of the beam intensity from ABS are discussed.