Intensity Measurements on the FILTEX Atomic Beam Source

Abstract

In order to increase the luminosity in storage ring experiments with polarized targets the development of internal targets has become of more and more interest for the last years. At the MPI fur Kernphysik in Heidelberg our group is developing a dense polarized hydrogen target based on the storage cell technique1. This target is designed for the FILTEX experiment which intends to study the spin dependence in pp- interaction with a polarized p-beam and a polarized p-target at LEAR2 and for the HERMES-experiment which is going to measure the spin-dependent structure functions of nucleons at HERA3. In the case of the FILTEX-experiment the internal target will act as a spinfilter, if the total cross section in pp interaction is spin dependent, as well as a polarized target for the determination of the spin correlation coefficients in pp-scattering. To perform these experiments a mean areal density of about 1014 H → /cm2 is needed. This can only be achieved with an intense H-atomic beam in combination with a storage cell since the target density is proportional to Q’H/C, where Q’H is the injected H → -flux and C is the conductance of the storage cell. Both quantities have to be optimized. This talk will be about the intensity optimization of the H-beam on the new Heidelberg-Marburg-Miinchen polarized source.