Bochum 2018 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 52: Poster
HK 52.30: Poster
Donnerstag, 1. März 2018, 16:30–18:45, Audimax Foyer
Precision high voltage divider for the electron cooler at CRYRING — T. Dirkes1, V. Hannen1, W. Nörtershäuser2,3, H.-W. Ortjohann1, O. Rest1, •D. Roth1, 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. That uncertainty could be removed by an in-situ precision measurement of the cooler voltage using a precision high voltage divider provided by PTB on a temporary basis. Therefore the construction of a high-precision divider for voltages up to 35 kV for the CRYRING electron cooler is ongoing in our group. The concept is similar to the ultrahigh-precision voltage dividers which have been constructed for use at the KATRIN experiment. The precision of the divider is designed to be in the low ppm range and will allow for measurement uncertainties in the < 10−5 region. We will present characterization measurements of the precision parts and first calibration measurements of the finished divider. This work is supported by BMBF under contract number 05P15PMFAA.