Zapfe, KirstenKirstenZapfeBrückner W.Gaul H.-G.Grieser M.MINN-TSONG LINMoroz Z.Povh B.Rall M.Stechert B.Steffens E.Stenger J.Stock F.Tonhäuser J.Montag Ch.Rathmann F.Fick D.Braun B.Graw G.Haeberli W.2018-09-102018-09-10199601689002http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:A1996TP58300006&KeyUID=WOS:A1996TP58300006http://scholars.lib.ntu.edu.tw/handle/123456789/322934https://www.scopus.com/inward/record.uri?eid=2-s2.0-0001634105&doi=10.1016%2f0168-9002%2895%2900608-7&partnerID=40&md5=8d772df23ebeb237f822f45eae4d1503A high-density target of polarized atomic hydrogen gas for applications in storage rings was produced by injecting atoms from an atomic beam source into a T-shaped storage cell. The influence of the internal gas target on electron-cooled beams of 27 MeV α-particles and 23 MeV protons in the Heidelberg Test Storage Ring has been studied in detail. Target polarization and target thickness were measured by means of 27 MeV α-particles. For hyperfine states 1 + 2 a target thickness of n = (0.96±0.04) × 1014 H→/cm2 was achieved with the cell walls cooled to 100 K. Working with a weak magnetic holding field (≈5 G) the maximum target polarization was PT = 0.84±0.02 when state 1 and PT = 0.46±0.01 when states 1 + 2 were injected. The target polarization was found to be constant over a period of 3 months with a net charge of Q ≈ 100 C passing the storage cell.journal article10.1016/0168-9002(95)00608-72-s2.0-0001634105WOS:A1996TP58300006