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Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 27: Poster

HK 27.85: Poster

Tuesday, March 28, 2017, 16:45–18:45, F Foyer

Status of the Precision High Voltage Divider for CRYRING — •V. Hannen1, W. Nörtershäuser2,3, H.-W. Ortjohann1, O. Rest1, Ch. Weinheimer1, and D. Winzen11Institut für Kernphysik, Uni Münster — 2Technische Universität Darmstadt — 3GSI, Darmstadt

To cool ion beams in the heavy ion storage ring CRYRING and thus achieve a low momentum spread, CRYRING features an electron cooler, where the ion beam is superimposed with a monoenergetic electron beam. In order to calculate the velocity of the electrons and therefore of the cooled ion beam, it is mandatory to continously monitor the cooler voltage with a high-precision divider. For that purpose a high-precision voltage divider for voltages up to 35 kV is currently being constructed in Münster, similar in design to the ultrahigh-precision voltage dividers in use at the KATRIN experiment. The precision of the divider will be in the low ppm range and will, if other sources of systematic uncertainties like e.g. space charge effects are under control, allow for measurement uncertainties in the < 10−5 region. Special care is taken to ensure a fast time response of the divider, for measurements where the cooler voltage is modified in regular intervals.
This project is supported by BMBF under contract number 05P15PMFAA. D. Winzen thanks HGS-HIRe for FAIR for funding his scholarship.

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