Upgrade of the POLDI diffractometer with a ZnS(Ag)/<sup>6</sup>LiF scintillation detector read out with WLS fibers coupled to SiPMs

Mosset, J.-B.; Stoykov, A.; Davydov, Vadim; Hildebrandt, M.; Swygenhoven, H. Van; Wagner, W.

doi:10.1088/1742-6596/528/1/012041

Cited by 5 publications

(12 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The appealing properties of the SiPM, principally low cost, radiation hardness [16,17], insensitivity to magnetic fields, and compact size make it of particular interest for our application. Other researchers have employed them in neutron detection applications as well [8,18,19]. Advances in the design of these devices have resulted in improvements in photon detection efficiency (PDE) from 20% to 30% and a reduction of the dark noise rate from 1 MHz events per mm 2 to less than 30 kHz per mm 2 .…”

Section: Silicon Photomultipliermentioning

confidence: 99%

“…Several other research groups have built position sensitive neutron detectors using sheets of scintillator with WLS fiber readout [6,7]. Another group has built a thermal neutron counter using the same scintillator with a mechanically embedded wavelength shifting fiber read out with an SiPM [8]. To our knowledge no other group has been motivated to build a detector with thinness being a primary constraint [9].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Selection of silicon photomultipliers for a⁶LiF:ZnS(Ag) scintillator based cold neutron detector

et al. 2018

View full text Add to dashboard Cite

We describe the process of selecting a silicon photomultiplier (SiPM) as the light sensor for an ultrathin (≈2 mm) highly efficient cold neutron detector. The neutron detector consists of 6 LiF:ZnS(Ag) scintillator in which wavelength shifting (WLS) fibers have been embedded. The WLS fibers conduct the scintillation light out from the scintillator to the SiPM photosensor. In addition to the many benefits of using silicon photomultipliers as photosensors (low cost, compact size, insensitivity to magnetic fields), their selection also presents many challenges (thermally induced dark noise, delayed cross talk, afterpulsing, etc) which are not shared by traditional photomultiplier tubes. In this work, we discuss the considerations for the selection of the appropriate silicon photomultiplier to achieve the best net neutron sensitivity and gamma ray discrimination. Important characteristics for these devices include short recovery time (≈35 ns), high photodetection efficiency (>30% at the target wavelength), low thermal noise (<35 kHz mm −2 at ambient temperatures), and low crosstalk.

show abstract

Section: Silicon Photomultipliermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Selection of silicon photomultipliers for a⁶LiF:ZnS(Ag) scintillator based cold neutron detector

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The SD pulse sequence is processed by the analyzer unit. Approaches for the realization of the analyzer can be chosen differently as described in [3,4,5]. In the current case we use a multistage "single-pulse elimination" filter described in [4] to extract the neutron signals from the dark-count background.…”

Section: Signal Processingmentioning

confidence: 99%

“…In this work we built a single-channel detection unit with SiPM readout (prototype units of 1/4 height were used in [3,4,5]) and characterized its performance by determining such parameters as trigger efficiency, background count rate, gamma-sensitivity, dead time, and multi-count ratio.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A SiPM-based ZnS:6LiF scintillation neutron detector

Stoykov

Mosset

Greuter

et al. 2015

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

In the work presented here we built and evaluated a single-channel neutron detection unit consisting of a ZnS:6 LiF scintillator with embedded WLS fibers readout by a SiPM. The unit has a sensitive volume of 2.4 x 2.8 x 50 mm 3 ; 12 WLS fibers of diameter 0.25 mm are uniformly distributed over this volume and are coupled to a 1 x 1 mm 2 active area SiPM. We report the following performance parameters: neutron detection efficiency ∼ 65 % at 1.2Å, background count rate < 10 −3 Hz, gamma-sensitivity with 60 Co source < 10 −6 , dead time ∼ 20 µs, multi-count ratio < 1 %. All these parameters were achieved up to the SiPM dark count rate of ∼ 2 MHz.We consider such detection unit as an elementary building block for realization of onedimensional multichannel detectors for applications in the neutron scattering experimental technique. The dimensions of the unit and the number of embedded fibers can be varied to meet the specific application requirements. The upper limit of ∼ 2 MHz on the SiPM dark count rate allows to use SiPMs with larger active areas if required.

show abstract

Detection of thermal neutrons using ZnS(Ag):6LiF neutron scintillator read out with WLS fibers and SiPMs

Hildebrandt

Stoykov

Mosset

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

In this paper we present the development of a 1-dimensional multi-channel thermal neutron detection system for the application in neutron scattering instrumentation, e.g. strain-scanning diffractometers. The detection system is based on ZnS(Ag): 6 LiF neutron scintillator with embedded WLS fibers which are read out with a SiPM. A dedicated signal processing system allows to suppress the SiPM dark counts and to extract the signals from the neutron absorption events. For a single-channel detection unit which represents the elementary building block of this detection system we achieved a neutron detection efficiency of ∼65 % at 1.2 Å, a background count rate <10 −3 Hz and a gamma-sensitivity <10 −6 (measured with a 60 Co source), while the dead time is ∼20 µs and the multi-count ratio is <1 %. This performance was achieved even for SiPM dark count rates of up to ∼2 MHz.

show abstract

Upgrade of the POLDI diffractometer with a ZnS(Ag)/⁶LiF scintillation detector read out with WLS fibers coupled to SiPMs

Cited by 5 publications

References 4 publications

Selection of silicon photomultipliers for a⁶LiF:ZnS(Ag) scintillator based cold neutron detector

Selection of silicon photomultipliers for a⁶LiF:ZnS(Ag) scintillator based cold neutron detector

A SiPM-based ZnS:6LiF scintillation neutron detector

Detection of thermal neutrons using ZnS(Ag):6LiF neutron scintillator read out with WLS fibers and SiPMs

Contact Info

Product

Resources

About

Upgrade of the POLDI diffractometer with a ZnS(Ag)/6LiF scintillation detector read out with WLS fibers coupled to SiPMs

Cited by 5 publications

References 4 publications

Selection of silicon photomultipliers for a6LiF:ZnS(Ag) scintillator based cold neutron detector

Selection of silicon photomultipliers for a6LiF:ZnS(Ag) scintillator based cold neutron detector

A SiPM-based ZnS:6LiF scintillation neutron detector

Detection of thermal neutrons using ZnS(Ag):6LiF neutron scintillator read out with WLS fibers and SiPMs

Contact Info

Product

Resources

About

Upgrade of the POLDI diffractometer with a ZnS(Ag)/⁶LiF scintillation detector read out with WLS fibers coupled to SiPMs

Selection of silicon photomultipliers for a⁶LiF:ZnS(Ag) scintillator based cold neutron detector

Selection of silicon photomultipliers for a⁶LiF:ZnS(Ag) scintillator based cold neutron detector