Bochum 2009 – scientific programme
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HK: Fachverband Hadronen und Kerne
HK 85: Accelerators and Instrumentation II
HK 85.4: Talk
Friday, March 20, 2009, 11:45–12:00, H-ZO 90
Performance of the WASA-at-COSY Pellet Target — •Florian Bergmann1, Alfons Khoukaz1, Guido D’Orsaneo2, Annika Passfeld1, Tobias Rausmann1, Dirk Spölgen2, and Alexander Winnemöller1 — 1Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 9, D-48149 Münster, Germany — 2Institut für Kernphysik and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425 Jülich, Germany
After several years of operation at the CELSIUS ring in Uppsala, the experimental setup WASA has been moved to the COSY synchrotron of the FZ Jülich and is operated since 2006 as the WASA-at-COSY facility. One important part of this experimental installation is the pellet target device, which is the first and only one operated at storage rings. It provides high effective areal target beam densities of ρ ≈ 5·1015 atoms/cm2 and is operated with hydrogen and deuterium as target material. Thus luminosities above L = 1031 cm−2s−1 can be achieved, allowing e.g. precision measurements on rare meson decays. Since the quality of the obtained data crucially depends on the perfomance of the pellet target, special efforts have been undertaken to provide high quality pellet beams. Of particular importance are the vacuum conditions in the scattering chamber, the regularity of the pellet flow or the long term stability of the complete target system.
In this contribution we will present the performance of the pellet target, which will also be of interest for future experimental facilities.
Supported by FZ Jülich, BMBF, and Wallenberg Foundation.