Münster 2011 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 54: Instrumentierung IX
HK 54.5: Vortrag
Donnerstag, 24. März 2011, 15:00–15:15, HS1
PSA via Wavelets — •Tobias Habermann1, Gerl Jürgen1, Goel Namita1, and Maruhn Joachim2 — 1GSI, Darmstadt — 2Goethe Universität Frankfurt, Institut für Theoretische Physik
Gamma ray tracking will be a substantial feature of upcoming gamma ray detector arrays (e.g. AGATA, GRETA). The precision and efficiency of tracking algorithms heavily depends on the knowledge of the exact interaction position inside the detector volume. To determine the position inside a segment of the detector pulse shape analysis (PSA) is applied. Due to a complicated electric field in parts of the detector there is no simple method to determine the position for a given pulse. Instead a database of pulse shapes with corresponding positions is created either by scanning the detector or from electric field simulations. The problem of finding the exact position for a given pulse is reduced to finding the best fit to this signal from the database. To apply PSA during experiments an efficient way to find the position from the database is needed. For this purpose we investigate a possible reduction of the amount of data to be stored in the database via wavelet transformation. A more general approach is given by the wavelet package transformation where the so called best basis algorithm is able to find the most compact description for a given signal.