Mainz 2022 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 68: Instrumentation XVIII

HK 68.2: Vortrag

Donnerstag, 31. März 2022, 16:30–16:45, HK-H4

The new MINIBALL triple cluster detector — •Jasper Wehlitz, Rainer Abels, Timon Büsken, Jürgen Eberth, Kai Henseler, Herbert Hess, Rouven Hirsch, Darius Luyken, and Peter Reiter — IKP Universität zu Köln, Cologne, Germany

The Miniball MB spectrometer consists of eight triple-cryostats, each housing three n-type six-fold segmented HPGe crystals. Major structural changes were made to the cryostat and its electronics to facilitate usability and to increase longevity. The HPGe crystals are individually encapsulated in reusable thin-walled aluminium housing using a new technique that is based on a temperature resistant full-metal elastic seal. As each crystal provides seven signals from the core and six segments a MB cryostat requires 21 preamplifiers. The cryogenically-cooled part of the preamplifier consists of seven jFET-type field effect transistors with their feedback circuits and a coupling capacitor. These parts were improved and coupled to the AGATA preamplifier [1] board in the warm part of the cryostat providing a high bandwidth needed for pulse-shape analysis. First measurements with the new MB triple cluster detectors show energy resolution values and crosstalk properties well within the specifications. The new MB detectors will be employed for future experiments with radioactive ion beams at HIE-ISOLDE (CERN).

[1] S. Akkoyun, et al., Nucl. Instrum. Methods Phys. Res. A 668 (2012) 26