Performance of position-sensitive flat-panel and resister type photomultiplier tube detector on neutron reflectometer SOFIA at J-PARC

Nemoto, Fumiya; Yamada, Norifumi L.; Satoh, Setsuo

doi:10.1016/j.nima.2022.166988

Cited by 3 publications

(2 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The wavelength resolution of the polychromator shown above is limited by two factors: the spatial resolution of the image on the detector, which is primarily governed by the detector resolution and the slope error of the focusing mirror; and the width of the Bragg reflection of the multilayer on the focusing mirror. The former can be reduced to less than 1% by applying the most recent technology, such as focusing mirrors via ultraprecise machining [4][5][6] and employing scintillation detectors [7]. Meanwhile, the width of the Bragg reflection of multiple layers of typical mirrors such as Ni/Ti remains at approximately several percent because no attempt has been made to obtain better resolutions, presumably because of the low demand for highresolution monochromators composed of multilayers.…”

Section: Crystallic Multilayermentioning

confidence: 99%

“…where 𝑥 is the distance from the detection position to the reflection plane at the polychromator center, 𝐿 is the flight distance from the polychromator to the detector, and the subscript 𝑚 of 𝜆 represents the order number of the Bragg peak. The image on the detector is blurred because of the spatial resolution of the detector and the slope error of the focusing mirror; here, the detector resolution is dominant if the focusing mirror developed by the author and collaborators is adopted [6,7]. Therefore, the wavelength resolution, ∆𝜆, of the detector can be described as…”

Section: Neutron Reflectometermentioning

confidence: 99%

See 1 more Smart Citation

Novel idea of neutron polychromator and application for reflectometry and spectroscopy

Yamada

2023

EPJ Web Conf.

Self Cite

View full text Add to dashboard Cite

Historically, two methods have been used to determine the wavelength of neutrons: (i) a timeof-flight method that separates the velocity of pulsed neutrons by the flight time; and (ii) a method utilizing Bragg reflection by a monochromator, such as a single crystal or multilayer mirror. The former cannot be applied to electromagnetic waves because the light velocity is constant and independent of the wavelength, whereas “polychromators” such as prisms and gratings, which separate wavelengths via chromatic dispersion, are typically used in the infrared to soft X-ray range. Although polychromators require collimated beams to separate wavelengths with sufficient resolution, this aspect does not affect laser and synchrotron light because they are naturally collimated. Herein, we propose a novel idea of a neutron polychromator utilizing an elliptical multilayered mirror that can be applied to a wide beam with a large beam divergence. In addition, examples of reflectometer and spectrometer applications are presented.

show abstract

Section: Crystallic Multilayermentioning

confidence: 99%

Section: Neutron Reflectometermentioning

confidence: 99%

Novel idea of neutron polychromator and application for reflectometry and spectroscopy

Yamada

2023

EPJ Web Conf.

Self Cite

View full text Add to dashboard Cite

show abstract

Scintillator-based Timepix3 detector for neutron spin-echo techniques using intensity modulation

Funama,

Chong,

Loyd

et al. 2024

Review of Scientific Instruments

View full text Add to dashboard Cite

A scintillator-based Timepix3 (TPX3) detector was developed to resolve the high-frequency modulation of a neutron beam in both spatial and temporal domains, as required for neutron spin-echo experiments. In this system, light from a scintillator is manipulated with an optical lens and is intensified using an image intensifier, making it detectable with the TPX3 chip. Two different scintillators, namely, 6LiF:ZnS(Ag) and 6LiI:Eu, were investigated to achieve the high resolution needed for spin-echo modulated small-angle neutron scattering (SEMSANS) and modulation of intensity with zero effort (MIEZE). The methodology for conducting event-mode analysis is described, including the optimization of clustering parameters for both scintillators. The detector with both scintillators was characterized with respect to detection efficiency, spatial resolution, count rate, uniformity, and γ-sensitivity. The 6LiF:ZnS(Ag) scintillator-based detector achieved a spatial resolution of 200 μm and a count rate capability of 1.1 × 105 cps, while the 6LiI:Eu scintillator-based detector demonstrated a spatial resolution of 250 μm and a count rate capability exceeding 2.9 × 105 cps. Furthermore, high-frequency intensity modulations in both spatial and temporal domains were successfully observed, confirming the suitability of this detector for SEMSANS and MIEZE techniques, respectively.

show abstract

Position-Sensitive Silicon Photomultiplier Arrays with Large-Area and Sub-Millimeter Resolution

Acerbi,

Merzi,

Gola

2024

Sensors

View full text Add to dashboard Cite

Silicon photomultipliers (SiPMs) are solid-state single-photon-sensitive detectors that show excellent performance in a wide range of applications. In FBK (Trento, Italy), we developed a position-sensitive SiPM technology, called “linearly graded” (LG-SiPM), which is based on an avalanche-current weighted-partitioning approach. It shows position reconstruction resolution below 250 μm on an 8 × 8 mm2 device area with four readout channels and minimal distortions. A recent development in terms of LG-SIPM is a larger chip version (10 × 10 mm2) based on FBK NUV-HD technology (near-ultraviolet sensitive), with a peak photon detection efficiency at 420 nm. Such a large-area detector with position sensitivity is very interesting in applications like MR-compatible PET, high-energy physics experiments, and readout of time-projection chambers, gamma and beta cameras, or scintillating fibers, with a reduced number of channels. These SiPMs were characterized in terms of noise, photon detection efficiency, and position resolution. We also developed tiles of 2 × 2 and 3 × 3 LG-SiPMs, reaching very large sensitive areas of 20 × 20 mm2 and 30 × 30 mm2. We implemented a “smart-channel” configuration, which allowed us to have just six output channels for the 2 × 2 elements and eight channels for the 3 × 3 element tiles, preserving a position resolution below 0.5 mm. These kinds of detectors provide a great advantage in compact and low-power applications by maintaining position sensitivity over large areas with a small number of channels.

show abstract

Performance of position-sensitive flat-panel and resister type photomultiplier tube detector on neutron reflectometer SOFIA at J-PARC

Cited by 3 publications

References 20 publications

Novel idea of neutron polychromator and application for reflectometry and spectroscopy

Novel idea of neutron polychromator and application for reflectometry and spectroscopy

Scintillator-based Timepix3 detector for neutron spin-echo techniques using intensity modulation

Position-Sensitive Silicon Photomultiplier Arrays with Large-Area and Sub-Millimeter Resolution

Contact Info

Product

Resources

About