Title: Application of Fast-digitizer Card Acqiris DP-240 in Positron Lifetime Spectroscopy
Citation: PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS vol. 6 no. 11 p. 2465-2467
Publication Year: 2009
JRC N°: JRC58612
ISSN: 1862-6254
URI: http://www3.interscience.wiley.com/cgi-bin/fulltext/122630274/PDFSTART
DOI: 10.1002/pssc.200982095
Type: Articles in periodicals and books
Abstract: Based on the available knowledge base in positron annihilation measurements, new software for digital positron lifetime spectrometry has been designed within the frame of joint activity between STU Bratislava and JRC Petten. The tests of the new positron digital-life time setup have been carried out. Detectors with BaF2 scintillators and fast-dynode outputs were chosen for such studies. As the digitiser unit, the card Acqiris DP240 was fully tested. Originally, start and stop timing signals were sampled to digital waveforms separately at a rate of 1 GS/s in 8 bit resolution. However, due to limited quality of collected waveforms which significantly affected post-processing of data, the joined delayed channel mode with 2 GS/s sampling rate was applied for further studies. The full setup was benchmarked by a series of calibration measurements of two high purity materials, specifically Si and Ni. The inter-comparison of conventional analogue- and digitalbased processing are discussed in detail. Further, the optimisation of main parameters for waveform-processing are analysed too. Such a new approach in the digital life-time spectroscopy will help to improve the resolution of existing methodology which might enhance the capabilities of this technique for further applications, especially in materials science.
JRC Directorate:Energy, Transport and Climate

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