Pulse selection algorithm for NM64 neutron detector

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Author(s)Kittiya, A.
Author(s)Nuntiyakul, W.
Author(s)Chaiwongkhot, K.
Author(s)Sáiz, A.
Author(s)Ruffolo, D.
Author(s)Seripienlert, A.
Author(s)Evenson, P.
Date Accessioned2024-02-22T21:08:17Z
Date Available2024-02-22T21:08:17Z
Publication Date2023-12-01
DescriptionThis article was originally published in Journal of Physics: Conference Series. The version of record is available at: https://doi.org/10.1088/1742-6596/2653/1/012020
AbstractWe propose an algorithm to sepearate pile-up pulses in neutron detectors by utilizing a standard pulse. For this method to be effective, the data must consist mostly of isolated pulses. First, we define a reference pulse by averaging a sample of clearly isolated pulses. Then, for an arbitrary signal, we calculate a shape deviation by summing up the squared residuals between it and the reference pulse. The pulse with the greatest shape deviation is removed from the process. We then recalculate the reference pulse and repeat until the remaining pulses have shape deviation within a threshold. These remaining pulses exhibit a very good linear trend between area and height, allowing us to screen those suspected as pile-ups. A pulse much higher than the final reference pulse, despite being in the area-height-trend and having low shape deviation, is considered a pile-up of two identical pulses. The final reference pulse is fitted to a function defined by two pieces of Gaussian-multiplied polynomial, normalized, and called the standard pulse. We attempted to fit the pile-up pulse with one standard pulse to separate pile-up pulses. If the sum of squared normalized residuals is higher than some threshold, we add one more pulse, try fitting again, and repeat up to three pulses. We apply this algorithm to the pulses collected from one counter at the Princess Sirindhorn Neutron Monitor station at the summit of Doi Inthanon Mountain, Chiang Mai, Thailand, measured by an oscilloscope. The algorithm correctly separates obvious pile-up cases, allowing to record individual pulse timing with improved accuracy. However, we found small pulses, usually belong to gamma rays, that blend with neutron pulse and pass 100 mV output filtration. After removing those under 100 mV, the pulse area distribution of the separated pile-up is consistent with that of single pulses except at very small pulse sizes.
SponsorThis work was supported by the Graduate School at Chiang Mai University (CMU), which provided funding for the student research scholarship. Further assistance came from the NSRF, managed by the Program Management Unit for Human Resources & Institutional Development, Research, and Innovation [grant number B39G660028]. Additional backing was provided by the National Science and Technology Development Agency (NSTDA) and the National Research Council of Thailand (NRCT) under the High-Potential Research Team Grant Program [grant number N42A650868]. We are grateful to the ITSC of CMU for furnishing an on-demand server for data analysis.
CitationKittiya, A, W Nuntiyakul, K Chaiwongkhot, A Sáiz, D Ruffolo, A Seripienlert, and P Evenson. “Pulse Selection Algorithm for NM64 Neutron Detector.” Journal of Physics: Conference Series 2653, no. 1 (December 1, 2023): 012020. https://doi.org/10.1088/1742-6596/2653/1/012020.
ISSN1742-6596
URLhttps://udspace.udel.edu/handle/19716/34012
Languageen_US
PublisherJournal of Physics: Conference Series
dc.rightsAttribution 3.0 Unporteden
dc.rights.urihttp://creativecommons.org/licenses/by/3.0
TitlePulse selection algorithm for NM64 neutron detector
TypeArticle
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