Mainz 2012 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 26: Instrumentation

HK 26.5: Vortrag

Mittwoch, 21. März 2012, 15:15–15:30, P 2

Reliability Studies of the Nozzle/Piezo units for the WASA-at-COSY Pellet Target* — •Florian Bergmann, Christina Husmann, Kay Demmich, Paul Goslawski, Alfons Khoukaz, and Alexander Täschner — Institut für Kernphysik, Westfälische Wilhelms-Universität Münster

At the fixed target experiment WASA-at-COSY a pellet target provides a stream of micrometer sized frozen hydrogen particles (pellets) for hadron physics experiments. The main part of the pellet source, a glass nozzle, is driven by a piezoelectric transducer working at high frequencies ranging from 30 to 80 kHz to produce regularly shaped droplets which freeze due to evaporation cooling and form pellets. For a good performance of the pellet target the quality of the nozzle and the attached piezo are of great importance. Due to the small opening of the nozzles (≈ 13 µ m) these components are very sensitive with respect to blocking. To avoid such problems a production line has been established at the Forschungszentrum Jülich which includes several cleaning steps and quality checks for the nozzles. To further improve the reliability of the prepared nozzle/piezo unit a dedicated setup has been built up in Münster. This device allows to operate the nozzles in vacuum with typical gas input pressures and with the piezo in operation. Furthermore, beside these tests with respect to nozzle blocking this setup allows for systematic tests on the piezoelectric transducers and their influence on possible working points for target operation. The design concept and first results will be presented and discussed.

*Supported by COSY-FFE grants