Polarized Jets And Storage Cell Targets For Storage Rings

Abstract

The state of the art of polarized gas targets for storage rings is reviewed. The storage cell technique is inevitable for producing densities with sufficient luminosity for electron scattering experiments. Different sources of polarized atoms for jets and storage cell targets are compared. Remarkable progress has been achieved over the last 15 years, which has led to a vast amount of experimental results with high statistics and good systematic precision. For hydrogen or deuterium gas targets based on atomic beam sources and cold storage cells an areal density of 10 14 atoms/cm 2 with high polarization has been achieved. For a next generation experiment this figure could be considerably enhanced.

Analysis of the beam intensity from the atomic beam source

“…Although there are two methods to produce polarized atoms for the target based on Stern-Gerlach separation of atoms [2] or laser-driven spin exchange method [3] it is the first one that is widely used practically [4]. This is connected with relative simplicity of the atomic beam sources (ABS), easily controlled parameters of the beam and purity of the target.…”