Development of 3He LPSDs and read-out system for the SANS spectrometer at CPHS

Gong, H.; Shao, B.B.; Wang, X.W.; Zhang, Y.; Pang, Beibei

doi:10.1016/j.nima.2013.10.009

Cited by 8 publications

(10 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In SANS spectrometry, the two-dimensional positionsensitive neutron detector (PSND) plays an important role and determines the quality of experimental data. At the start of the CPHS project, a 3 He linear position-sensitive detector (LPSD) (Huang et al, 2014), with 1 m Â 1 m sensitive area, was selected to be the main PSND. However, since the advent of the 3 He shortage, we have been seeking to develop a costeffective 3 He-free detector.…”

Section: Background and Motivationmentioning

confidence: 99%

Development and performance evaluation of a multi-layer boron-lined detector for the CPHS-SANS instrument

Jiang¹,

Gong²,

Li³

et al. 2021

J Appl Cryst

View full text Add to dashboard Cite

A position-sensitive thermal neutron detector module based on multi-layer boron-lined tubes has been developed. It is designed for the CPHS (compact pulsed hadron source) SANS (small-angle neutron scattering) instrument [Loong et al. (2012). Phys. Procedia, 26, 8–18]. The detector module consists of 64 boron-lined tubes, arranged into an eight row by eight column structure. Several key aspects of the development of the detector prototype are briefly covered, including the detector module structure design, the readout electronic system and the digital filter of neutron waveforms. Preliminary characterization reveals that the detector module could achieve an average axial spatial resolution of 5.62 mm and a good position linearity. The detection efficiency measurement shows that more than 30% efficiency can be achieved for thermal neutrons on the CPHS. A virtual experiment was conducted to evaluate the performance of the multi-layer boron-lined tubes in SANS measurement; the effect of inside detector scattering of the multi-layer detector was simulated. The result shows that, by implementing proper data reduction, the impact of inside detector scattering on the Q (momentum transfer) value and Q resolution is negligible.

show abstract

Section: Background and Motivationmentioning

confidence: 99%

Development and performance evaluation of a multi-layer boron-lined detector for the CPHS-SANS instrument

Jiang¹,

Gong²,

Li³

et al. 2021

J Appl Cryst

View full text Add to dashboard Cite

show abstract

“…A Small Angle Neutron Scattering (SANS) spectrometer is anticipated to be commissioned by late 2025 at CPHS. The main detector of CPHS-SANS employs a two-dimensional array of 96 3 He linear position-sensitive detectors (LPSD), each with a detection length of 800 mm and a diameter of 8 mm. Addressing the demand for efficient signal processing of this 2D detector array, traditional analog shaping methods, predominantly Gaussian shapers [2][3][4][5], have been employed in preliminary experiments.…”

Section: Introductionmentioning

confidence: 99%

“…The main detector of CPHS-SANS employs a two-dimensional array of 96 3 He linear position-sensitive detectors (LPSD), each with a detection length of 800 mm and a diameter of 8 mm. Addressing the demand for efficient signal processing of this 2D detector array, traditional analog shaping methods, predominantly Gaussian shapers [2][3][4][5], have been employed in preliminary experiments. However, during testing, we discerned that the LPSD's unique elementary signal, a 𝛿-pulse followed by a 1/𝑡 tail, results in severe ballistic deficit in amplitude determination, and evident baseline drift at high count rates [6].…”

Section: Introductionmentioning

confidence: 99%

Study of readout system for ³He linear position sensitive detectors

Hua,

Gong,

Liu

et al. 2024

J. Inst.

View full text Add to dashboard Cite

This study introduces a readout system for 3He linear position-sensitive detectors (LPSDs), tailored for the Small Angle Neutron Scattering (SANS) spectrometer of the Compact Pulsed Hadron Source (CPHS) at Tsinghua University. Central to this system is the employment of a trapezoidal filter as the primary signal shaper, selected for its enhanced noise filtering capabilities and efficacy in mitigating ballistic deficit. Additionally, the integration of a digital CR filter aims to counteract baseline drift within trigger signals. This innovative architecture underwent validation via computer programs using experimental data, demonstrating superior performance in spatial resolution compared to conventional Gaussian filter-based approaches. Meanwhile, the improvement in spatial resolution comes with a narrower pulse width, promising a higher throughput at high count rates. When applied to a 16-tube detector module, the system achieved an average position resolution of 3.63 mm (FWHM) at the central region and 4.03 mm at the end regions. Furthermore, with a pusle width of 0.6 μs, the 96-tube detector array is promised to sustain a count rate over 1 Mcps.

show abstract

“…The electronics system needs 192 channels to receive and process signals from both ends of the detector. The position where the neutron has hit the 3 He tube is reconstructed with the charge division method [6]. Thus, a single 3 He tube has a one-dimensional position resolution capability.…”

Section: Introductionmentioning

confidence: 99%

A digital system of acquisition and coincidence for SANS

Zhang

Shen

et al. 2020

J. Inst.

View full text Add to dashboard Cite

A: We have developed multi-channel signal acquisition with a coincidence digital circuit for a two-dimensional detector array of the small-angle neutron scattering spectrometer (SANS) of the Institute of Nuclear Physical Chemistry at the Chinese Academy of Engineering Physics. This paper discusses how to determine such factors as the coincidence time window and program dead time according to the characteristics of the detector signal and how to correct the timer to realize the data coincidence. The whole system can support up to 192 analog channels connected to a fast analog-to-digital converter, supporting speeds of 50 MSPS for each channel managed by a fieldprogrammable gate array (FPGA). The internal clock of the FPGA is 50 MHz and the time accuracy is 20 ns. Preliminary experiments are carried out and the results are presented and discussed. The whole design can fully meet the needs of the spectrometer.

show abstract

Development of 3He LPSDs and read-out system for the SANS spectrometer at CPHS

Cited by 8 publications

References 8 publications

Development and performance evaluation of a multi-layer boron-lined detector for the CPHS-SANS instrument

Development and performance evaluation of a multi-layer boron-lined detector for the CPHS-SANS instrument

Study of readout system for ³He linear position sensitive detectors

A digital system of acquisition and coincidence for SANS

Contact Info

Product

Resources

About

Development of 3He LPSDs and read-out system for the SANS spectrometer at CPHS

Cited by 8 publications

References 8 publications

Development and performance evaluation of a multi-layer boron-lined detector for the CPHS-SANS instrument

Development and performance evaluation of a multi-layer boron-lined detector for the CPHS-SANS instrument

Study of readout system for 3He linear position sensitive detectors

A digital system of acquisition and coincidence for SANS

Contact Info

Product

Resources

About

Study of readout system for ³He linear position sensitive detectors