Optimal design of waveform digitisers for both energy resolution and pulse shape discrimination

Cang, Jirong; Xue, T.; Zeng, Ming; Zeng, Zhi; Ma, Hui; Cheng, Jianping; Liu, Yinong

doi:10.1016/j.nima.2018.01.064

Cited by 6 publications

(10 citation statements)

References 9 publications

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“…In this section, we make use of the theory proposed by J.Cang [6,7] et al and ADC quantization noise theory to research how digitizer's sampling properties influence the performance of CCM. Refer to their research, the variance of the integral of CCM σ 2 Q n can be calculated from…”

Section: Derivation Of the Relationship Between Ccm Performance And Smentioning

confidence: 99%

Section: Derivation Of the Relationship Between Ccm Performance And S...mentioning

confidence: 99%

“…J. Zhang et al focused on the influence of sampling rate on n/γ discrimination for stilbene scintillation detectors and researched the improvement caused by digital signal process (DSP) algorithms [5]. For LaBr 3 :Ce scintillators, J. Cang et al studied the influence of sampling properties on the energy resolution and α/γ discrimination for LaBr 3 :Ce and proposed a quantitative model for optimal digitizer selection based on the Charge Comparison Method (CCM) [6]. Although the above studies have compared the influence of sampling properties on PSD performance, they were limited to the use of CCM alone.…”

Section: Introductionmentioning

confidence: 99%

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Performance of linear classification algorithms on α/γ discrimination for LaBr3:Ce scintillation detectors with various pulse digitizer properties

Wen¹,

Zhu²,

Xue

et al. 2020

J. Inst.

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A: With the development of high-speed readout electronics, the digital pulse shape discrimination (PSD) methods have attracted the attention of more researchers, especially in the field of high energy physics and neutron detection. How to choose a PSD algorithm and corresponding data acquisition system (DAQ) naturally becomes a critical problem to settle down for the detection system designers. In this paper, the relationship between the classification performance of different PSD algorithms and digitizers' sampling properties (including sampling rate and the effective number of bits) has been researched based on LaBr 3 :Ce scintillation detectors. A self-developed integrated digitizer configured with five different ADCs and a WavePro 404HD oscilloscope were deployed to digitize the waveforms from LaBr 3 :Ce scintillators. Moreover, three PSD methods, charge comparison method (CCM), least square for classification method (LS) and Fisher's linear discriminant analysis (LDA), based on linear model were applied to discriminate the alpha signals from the intrinsic isotope 227 Ac. With the LS method and a 125 MSPS 14-Bit ADC, the FoM value was 1.424±0.042, which is similar to the result from LDA but 31% better than the result of CCM. The discrimination results showed that the performances of LS and LDA are less affected by the sampling rate with respect to the CCM method, which reflects in a better PSD capability. The results of this paper can help the developers of detector systems to make a trade-off among sampling properties, desirable discrimination results and the cost of systems.

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Section: Derivation Of the Relationship Between Ccm Performance And Smentioning

confidence: 99%

Section: Derivation Of the Relationship Between Ccm Performance And S...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance of linear classification algorithms on α/γ discrimination for LaBr3:Ce scintillation detectors with various pulse digitizer properties

Wen¹,

Zhu²,

Xue

et al. 2020

J. Inst.

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“…It is a potential counterpart for 3 He proportional counter tube [1] [2] and can be used as high resolution gamma-ray and neutron spectrometers due to its exceptional PSD (Pulse Shape Discrimination) performance [3]. Digital PSD algorithms [4] have been widely used in radiation detectors such as LaBr3 scintillator [5], plastic scintillators [6], and organic scintillators [7] [8]. PSD FOM (Figure Of Merit) is generally used to evaluate the performance of the particle discrimination, e.g.…”

Section: Introductionmentioning

confidence: 99%

Optimization of energy resolution and Pulse Shape Discrimination for a CLYC detector with integrated digitizers

Xue¹,

Zhu²,

Wen³

et al. 2020

J. Inst.

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Sufficient current pulse information of nuclear radiation detectors can be retained by direct waveform digitization owing to the improvement of digitizer's performance. In many circumstances, reasonable cost and power consumption are on demand while the energy resolution and PSD performance should be ensured simultaneously for detectors. This paper will quantitatively analyse the influence of vertical resolution and sampling rate of digitizers on the energy resolution and PSD performance. The energy resolution and PSD performance can be generally optimized by improving the sampling rate and ENOB (effective number of bits) of digitizers. Several integrated digitizers, with sampling rates varying from 100 MSPS to 500 MSPS and vertical resolution ranging from 12-Bit to 16-Bit, were designed and integrated with a CLYC detector for verifications. Experimental results show good accordance with theoretical calculations. The conclusion can give guidance to designs of digitizes for similar applications in need of optimizing the energy resolution and PSD performance, and help to choose proper digitizers for different requirements.

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“…The energy resolution is contributed by two parts: the inherent energy resolution of the detector and the electronic noise, which is calculated by equation (7) from reference [7], (7) where is central value of the integral charge, is the uncertainty of the integral charge.…”

Section: B Theoretical Calculation Of Energy Resolutionmentioning

confidence: 99%

Performances of operational amplifiers in front-end electronics for nuclear radiation detectors

Cerizza

Fazzi

Varoli

IEEE Symposium Conference Record Nuclear Science 2004.

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Operational amplifiers in charge sensitive configuration are an attractive solution for front-end electronics in cost-sensitive radiation detection systems. The noise performances of several JFET input operational were tested in a charge-sensitive configuration. Some rather old devices reached noise performances low enough for detection of x and γ rays in application were extreme energy resolution is no required as, for instance, dosimetry and ambient monitoring applications. On the contrary the devices with the best specification for noise and speed shown an excess noise when used in a charge sensitive configuration with the low feedback capacitor required by this application. By matching the impedences seen at both input of the amplifier, the noise is reduced near to the theoretical value. The origin of this fact seems to be a non white equivalent current noise generator, whose origin is in the first stage bias circuit. Datasheet parameters are not sufficient, at least in some cases, for computing the actual noise of a charge preamplifier built with an operational amplifier

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Optimal design of waveform digitisers for both energy resolution and pulse shape discrimination

Cited by 6 publications

References 9 publications

Performance of linear classification algorithms on α/γ discrimination for LaBr3:Ce scintillation detectors with various pulse digitizer properties

Performance of linear classification algorithms on α/γ discrimination for LaBr3:Ce scintillation detectors with various pulse digitizer properties

Optimization of energy resolution and Pulse Shape Discrimination for a CLYC detector with integrated digitizers

Performances of operational amplifiers in front-end electronics for nuclear radiation detectors

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