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HK: Fachverband Hadronen und Kerne

HK 10: Accelerators and Instrumentation II

HK 10.3: Talk

Monday, March 16, 2009, 14:45–15:00, H-ZO 90

Further development of the precision HV divider for the KATRIN experiment — •Stephan Bauer, Frank Hochschulz, Stephan Rosendahl, Matthias Prall, and Christian Weinheimer — Institut für Kernphysik, Westfälische Wilhelms-Universität Münster

To determine the mass of the ν_e with a sub-eV sensitivity the KATRIN- (KArlsruhe TRItium Neutrino-) experiment measures the tritium β spectrum in the endpoint region using a MAC-E type spectrometer. To reach the desired sensitivity the retarding potential of the MAC-E-filter of −18.6kV must be monitored with a precision of 3ppm. For that purpose a precision high voltage divider for voltages of up to 30kV was developed in cooperation with the PTB (Physikalisch-Technische Bundesanstalt) Braunschweig. This first divider has been proven to deliver the necessary accuracy and stability.

For redundancy reasons and as a replacement during the calibration periods a second high voltage divider was developed based upon the experience gained from the first divider. The main goal of the development of the second divider was the improvement of the longterm stability and to expand the possible field of application to other experiments. In this talk the improvements of the second divider are shown along with calibration results obtained at the PTB.

This project is supported by BMBF under contract number 05A08PM1.