Mainz 2012 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 45: Poster – Hadronenstruktur und -spektroskopie

HK 45.4: Poster

Donnerstag, 22. März 2012, 14:00–16:00, P Foyer

Detector development for in-trap decay studies in a Penning trap* — •Peter Müller, Jasmin Moazzami-Fallah, Peter Thirolf, and Christine Weber — LMU München

The precision of decay spectroscopy experiments is limited due to scattering in the source material. However, well-localized ions in a Penning trap, can be considered as an ideal, carrier-free source. In order to investigate α decays, the ring electrode is replaced by a detector array, also providing the trapping potential. This "Detector-Trap" is developed at MLLTRAP to be implemented in the future MATS facility at FAIR. It consists of a cubic array of 4 single-sided silicon strip detectors, which measure energy and polar angle of the α particles, released in the trap centre. Each sensor contains 30 strips with 1mm pitch, totally covering a solid angle of 67%. UHV and cryogenic conditions inside the trap require customized solutions for all individual components of the detector trap. The Si sensors are glued on ceramic circuit boards; glue and ceramics being selected due to their thermal properties (matched to silicon) and their low outgassing rate. The Capton insulated multiwire signal cables are connected to the circuit boards via customized PEEK (a low outgassing polymer) connectors and flexible spring contacts. The cubic detector array is mounted via grooves in the adjacent trap electrodes.
* Supported by BMBF(06ML9148)