ION-EXTRACTION POLARIMETRY FOR TENSOR POLARIZED DEUTERIUM INTERNAL TARGETS

An ion-extraction polarimeter has been developed for internal target e xperiments in storage rings. Here, we report on the application of suc h a device for a tensor polarized deuterium gas target internal to a m edium-energy electron storage ring. Ions, produced by the stored elect ron beam, were extracted from a storage cell using electrostatic lense s and a spherical deflector, transported to a mass-analyzer, and subse quently to a H-3((d) over left right arrow,n)alpha tensor polarization analyzer. The method allows determining the density-averaged nuclear polarization of the target gas, independent of spatial and temporal va riations. We discuss in detail the systematic uncertainties (< 5%) ass ociated with this technique. (C) 1998 Elsevier Science B.V. All rights reserved.