Dresden 2000 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 19: Instrumentation und Anwendungen III
HK 19.5: Talk
Thursday, March 23, 2000, 15:30–15:45, B 118
The polarized gas storage-cell target for ANKE/COSY - results of ABS-beam studies — •M. Mikirtytchiants1,2, R. Baldauf3, R. Engels4, H. Kleines3, V. Koptev5, P. Kravtsov5, S. Lorenz6, B. Lorentz1, M. Nekipelov1,2, V. Nelyubin5, F. Rathmann1,6, J. Sarkadi3, H. Paetz gen. Schieck4, H. Seyfarth1, E. Steffens6, H. Ströher1, A. Vassiliev5, and K. Zwoll3 — 1Institut für Kernphysik, FZ-Jülich — 2PhD student from St. Petersburg Nuclear Physics Institute — 3Zentrallabor für Elektronik, FZ-Jülich — 4Universität zu Köln — 5St. Petersburg Nuclear Physics Institute — 6Universität Erlangen-Nürnberg
The assembling of the polarized atomic beam source has been completed. All six permanent sextupole magnets, delivered by Vacuumschmelze Hanau, yield pole-tip field strenghts ∼ 1.6 T. Field-distribution measurements have revealed 54- and 102-pole contributions superposed on the 6-pole distribution in agreement with the analytical results by Halbach. The rf-transition units, built at the Universität Erlangen, have been installed. The degree of dissociation in the beam has been studied with use of a crossed-beam quadrupole mass spectrometer. A novel type of beam monitor, based on the recombination heat delivered to a grid of thin wires, has been used for beam-profile studies. The absolute intensity of the polarized atomic beam and the efficiencies of the rf-transition units have been measured with a compression-tube. Additional studies with a Lamb-shift polarimeter, developed at the Universität zu Köln, are under way. The design of the storage cell and the test measurements concerning the cell size and the cell–COSY beam interaction are discussed.