J.G. Hardie

Polarized internal gas target for hydrogen and deuterium at the IUCF Cooler Ring

Abstract A polarized internal gas target has been constructed and used at the IUCF Cooler Ring. Polarized hydrogen atoms produced by a high-intensity atomic beam source are injected into a target cell whose Teflon walls are thin enough to allow low-energy recoil particles to be detected in coincidence with forward scattered particles. An average proton target polarization of 0.740±0.013 has been measured.

Calibration of the polarization of a beam of arbitrary energy in a storage ring

Abstract Once the absolute polarization of a stored proton beam is established by observing a nuclear reaction with a known analyzing power at a given energy, this calibration can be transported to a different energy since in a ring it is possible to easily change the energy of a stored sample of beam particles. This leads to a method to establish new calibration standards at arbitrary new energies. This has been demonstrated in an experiment with the Indiana Cooler.

Polarized internal gas target for hydrogen and deuterium at the IUCF cooler ring

A polarized internal H gas storage cell target has been successfully operated in the IUCF cooler ring. A target thickness for atomic hydrogen has been measured to be 3.5±0.3×1013/cm2 in a single spin state. Target polarization (0.75±0.01) showed no sign of deterioration after two weeks of operation with an average beam current of 100 μA. Detection of p‐p elastic events at 200 MeV bombarding energy has been demonstrated by use of coincidences between silicon detectors near the beam and a forward detector array. This target is presently being used to measure p‐p elastic scattering spin correlation coefficients at 200 MeV.