Darmstadt 2016 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 45: Postersession
HK 45.14: Poster
Mittwoch, 16. März 2016, 18:30–20:30, S1/05 22-24
Precision high voltage divider for the electron cooler at CRYRING — I. Denesjuk1, V. Hannen1, W. Nörtershäuser2,3, H.-W. Ortjohann1, O. Rest1, Ch. Weinheimer1, and •D. Winzen1 — 1Institut für Kernphysik, Uni Münster — 2Institut für Kernchemie, Uni Mainz — 3GSI, Darmstadt
The heavy ion storage ring CRYRING at GSI provides a unique possibility to test atomic structure calculations with slow exotic ion beams at energies in the range of 0.3 MeV/u up to 15 MeV/u. In order to cool the ions and thus achieve a low momentum spread of the stored beam, CRYRING features an electron cooler, where the ion beam is superimposed with a monoenergetic electron beam. In earlier measurements of hyperfine transitions in hydrogen- and lithiumlike ions at Experimental Storage Ring (ESR), the limiting uncertainty was the voltage measurement of the electron cooler which determines the velocity of the ions. That uncertainty could be removed by an in-situ precision measurement of the cooler voltage using a high voltage divider provided by PTB on a temporary basis. We therefore plan to construct a high-precision divider for voltages up to 35 kV which will be similar to the ultrahigh-precision voltage dividers which have been constructed for use at the KATRIN experiment. The precision of the divider will be in the low ppm range and will allow for measurement uncertainties in the < 10−5 region. The concept and first characterization measurements of the precision components will be presented. This work is supported by BMBF under contract number 05P15PMFAA. Daniel Winzen thanks HGS-HIRe for FAIR for funding his scholarship.