The Polarized Internal Gas Target of ANKE at COSY

摘要

For future few-nucleon interaction studies with polarized beams and targets at COSY-Juelich, a polarized internal-storage cell gas target is currently being developed and will be implemented in the near future at ANKE. The polarized atomic beam source, which will feed the target, provides beam intensities of 7.4 · 10~(16) atoms/s in two hyperfine states of hydrogen. The implementation of the target at the internal spectrometer ANKE constitutes a major technological enterprise. The differential pumping system at ANKE has already been installed, as well as a new large target chamber to accomodate storage cells in the future, a new set of small-aperture horizontal and vertical beam position monitors, and a system of target-near detectors. In order to determine the nuclear polarization of the target, a Lamb-Shift polarimeter is currently set up. Tests with prototype storage cells aiming at the identification of cell dimensions suitable for the ANKE target are underway.