Performance analysis of a digital positron lifetime spectrometer

Nissilä, J.; Rytsölä, K.; Aavikko, Reino; Laakso, A.; Saarinen, K.; Hautojärvi, P.

doi:10.1016/j.nima.2004.08.102

Cited by 48 publications

(25 citation statements)

References 17 publications

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“…Note that the works of [2,3] show that the gaussian function can also be used for interpolation on the real data. However this is slow compared to other methods because of the addtional step of fitting the Gaussian to the data.…”

Section: Simulated Pulsesmentioning

confidence: 99%

Digital positron lifetime: the influence of noise

Krille¹,

Anwand²,

Krause‐Rehberg³

2011

J. Phys.: Conf. Ser.

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Abstract. In contrast to the world around where everything seems to go digital as soon as possible, positron lifetime spectrometers are kind of a "last sanctuary" for analog measurements. Only a few of the newer spectrometers use the analog-digital-converters directly after the photomultipliers and extract the timing information via computer. Judging from their results it seems as if the current available converters and the timing mathematics are only as good as the conventional analog setup in the timing resolution.As it is decided that EPOS [1] will use digital positron lifetime, we try to find some reasons for limited timing resolution by simulating anode pulses from the photomultipliers and measuring the FWHM. We create pulses similar to current state-of-the-art 4GS/s digitizers but can control the level of noise and the bit-depth independently.We found that especially the noise (that would come from the analog electronics in/before the converters) has a great influence on the timing resolution. Also we try to use lowpass filtering to reduce that influence with great success.

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Section: Simulated Pulsesmentioning

confidence: 99%

Digital positron lifetime: the influence of noise

Krille¹,

Anwand²,

Krause‐Rehberg³

2011

J. Phys.: Conf. Ser.

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“…The samples were measured in darkness between 20 and 540 K with analog and digital 25 positron lifetime spectrom- eters. The time resolutions of the spectrometers were 240 and 215 ps full width at half maximum, respectively.…”

Section: A Experimental Detailsmentioning

confidence: 99%

Clustering of vacancy defects in high-purity semi-insulating SiC

et al. 2007

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Positron lifetime spectroscopy was used to study native vacancy defects in semi-insulating silicon carbide. The material is shown to contain ͑i͒ vacancy clusters consisting of four to five missing atoms and ͑ii͒ Sivacancy-related negatively charged defects. The total open volume bound to the clusters anticorrelates with the electrical resistivity in both as-grown and annealed materials. Our results suggest that Si-vacancy-related complexes electrically compensate the as-grown material, but migrate to increase the size of the clusters during annealing, leading to loss of resistivity.

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“…The large number of channels in some of these experiments necessitates pulse processing in hardware, either on an FPGA or an application specific integrated circuit (ASIC). In contrast software based real-time analysis has been applied in positron lifetime spectrometers [9]. The task of measuring time intervals with 200 ps resolution and kHz count rates is similar to ToF-ERDA.…”

Section: Introductionmentioning

confidence: 99%

Digitizing data acquisition and time-of-flight pulse processing for ToF-ERDA

Julin

Sajavaara

2016

Nuclear Instruments and Methods in Physics Research Section B:

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A versatile system to capture and analyze signals from multi channel plate (MCP) based time-of-flight detectors and ionization based energy detectors such as silicon diodes and gas ionization chambers (GIC) is introduced. The system is based on commercial digitizers and custom software. It forms a part of a ToF-ERDA spectrometer, which has to be able to detect recoil atoms of many different species and energies. Compared to the currently used analogue electronics the digitizing system provides comparable time-of-flight resolution and improved hydrogen detection efficiency, while allowing the operation of the spectrometer be studied and optimized after the measurement. The hardware, data acquisition software and digital pulse processing algorithms to suit this application are described in detail.

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Performance analysis of a digital positron lifetime spectrometer

Cited by 48 publications

References 17 publications

Digital positron lifetime: the influence of noise

Digital positron lifetime: the influence of noise

Clustering of vacancy defects in high-purity semi-insulating SiC

Digitizing data acquisition and time-of-flight pulse processing for ToF-ERDA

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