Mechanical Design of Storage Cells

Abstract

In this contribution I will describe the mechanical design aspects of storage cells for polarized internal gas targets. Such targets consist of a flux of polarized atoms directed into a thin-walled storage cell. I will limit myself to applications involving medium- and high-energy electron rings, such as the MIT-Bates and NIKHEF pulse-stretcher rings, and the HERA electron storage ring at DESY. As target gas I will only consider polarized hydrogen, deuterium and ³He. Valuable practical experience with polarized internal gas targets has been obtained by the Argonne-Novosibirsk collaboration^[1] at the VEPP-3 electron machine. Tests^[2] with a storage cell have also been conducted at the DORIS machine at DESY. In the former experiment a 94 cm long elliptical tube with a 46 (24) mm horizontal (vertical) aperture has been used. In the latter case a 50 cm long fixed cylindrical stainless steel tube with a diameter of 15 mm has been employed. Furthermore, experience has been gained during the design and construction of the MIT polarized ³He internal target^[3], while valuable in-beam experience was obtained in experiments using the Caltech polarized ³He external target^[4].