Digital pulse processor for spectrometry of charged particles, neutrons, x-ray, and gamma-ray

1Arkhangelsky, AI, 1Kotov, Yu.D, 2Chistiakov, PYu.
1National Research Nuclear University «MEPhI», Moscow, Russia
2Ltd. SKINER, Moscow, Russia
Kosm. nauka tehnol. 2003, 9 ;(5-6):060-064
Publication Language: Russian
A high performance digital pulse processor is developed for spaceflight applications. A fully digital method for acquisition of spectra of charged particles, neutrons, and gamma-ray in a wide energy range was developed and tested. A fast 40 MHz digitizer is used to digitize pulses from scintillation and semiconductor detectors with decay times in a range of 250 to 10000 ns to 12-bit resolution on 25 ns intervals. Digital filtering, pulse searching and pulse shape discrimination algorithms are used to identify pulses, detect for pileup and pulse saturation. The pulse processor measures pulse height, pulse area, and the required timing information (e. g. multi detector coincidence). A pulse shape distribution is generated, corresponding to a conventional multichannel analyzer spectrum. Thanks to parallel digital architecture of the device, the interface is ISA-8 bus compatible. The fast real time pulse-processing algorithm will allow wide use of the technique described in high performance spectroscopy.
Keywords: analyzer spectrum, pulse processor, pulse-processing algorithm
1. Kotov Yu. D. The scientific tasks of the Russian CORONAS–FOTON space project. In: 3rd Ukrainian Conference for Perspective Space Researches: Abstracts, 34 (Katsiveli, Crimea, 2003) [in Russian].
2. Meleshko E. A. Fast waveform digitizers. Pribory i tehn. jeksperimenta, No. 1, 5—26 (1997) [in Russian].
3. Khryachkov V. A., Dunaev M. V., Ketlerov V. V., et al. A new method for charged particles identification with a CsI(TL) crystal. Pribory i tehn. jeksperimenta, No. 3, 29—37 (2000) [in Russian].
4. Drndarevic V., Ryge P., Gozani T. Digital signal processing for high rate gamma-ray specroscopy. Nucl. Instrum. and Meth. in Phys. Res., A277, 532—536 (1989).
5. Hilsenrath F., Voss H. D., Bakke J. C. A single chip pulse processor for nuclear spectroscopy. IEEE Trans. Nucl. Sci., NS-32 (1), 145—149 (1985).
6. Kotov Yu. D. The scientific tasks and instruments of the PHOTON space project for the study of solar flares. J. Moscow phys. Soc., 6 (4), 311—315 (1996).
7. Storey R. S., Jack W., Ward A. The Fluorecent Decay of CsI(Tl) for Particles of different ionisation density. Proc. Phys. Soc., 72 (1), 1—6 (1958).

8. Yue Q., Lai W. P., Chang W. C., et. al. Effective dynamic range in measurements with flash analog-to-digital convenor. Nucl. Instrum. and Meth. in Phys. Res., A511, 408—416 (2003).