Large area microchannel plate detector with amorphous silicon pixel array readout for fast neutron radiography

Ambrosi, Richard M.; Fraser, George W.; Feller, Bruce; Street, R. A.; Watterson, J.I.W.; White, Paul L.; Downing, Greg

doi:10.1016/s0168-9002(03)00297-3

Cited by 14 publications

(9 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…electron multiplication and detection) are beyond the scope of this review. However, here again, benefiting from the advances of the x-ray and charged particle detection communities, the MCP-based neutron detectors are poised to provide excellent two-dimensional spatial (<15 μm) and temporal (1 μs) [324,325] or one-dimensional temporal (50 ns) [326] resolution on a platform that can theoretically compete in total thermal neutron detection efficiency (from 2-12% [323] to 50% [326] calculated) with the planar and threedimensional detector classes described above. Unfortunately, the direct incident neutron energy information is made nearly undecipherable by the charge multiplication process, but with such excellent timing resolution, time-of-flight studies in the proper geometry (vide infra) could be possible [326].…”

Section: Indirect-conversion Heterostructuresmentioning

confidence: 99%

The physics of solid-state neutron detector materials and geometries

Caruso

2010

J. Phys.: Condens. Matter

125

111

View full text Add to dashboard Cite

Detection of neutrons, at high total efficiency, with greater resolution in kinetic energy, time and/or real-space position, is fundamental to the advance of subfields within nuclear medicine, high-energy physics, non-proliferation of special nuclear materials, astrophysics, structural biology and chemistry, magnetism and nuclear energy. Clever indirect-conversion geometries, interaction/transport calculations and modern processing methods for silicon and gallium arsenide allow for the realization of moderate- to high-efficiency neutron detectors as a result of low defect concentrations, tuned reaction product ranges, enhanced effective omnidirectional cross sections and reduced electron-hole pair recombination from more physically abrupt and electronically engineered interfaces. Conversely, semiconductors with high neutron cross sections and unique transduction mechanisms capable of achieving very high total efficiency are gaining greater recognition despite the relative immaturity of their growth, lithographic processing and electronic structure understanding. This review focuses on advances and challenges in charged-particle-based device geometries, materials and associated mechanisms for direct and indirect transduction of thermal to fast neutrons within the context of application. Calorimetry- and radioluminescence-based intermediate processes in the solid state are not included.

show abstract

Section: Indirect-conversion Heterostructuresmentioning

confidence: 99%

The physics of solid-state neutron detector materials and geometries

Caruso

2010

J. Phys.: Condens. Matter

125

111

View full text Add to dashboard Cite

show abstract

“…Modification of the MCP glass mixture by adding a neutron-absorbing material without changing the remainder of the manufacturing process has been suggested by Fraser and Pearson [9] and successfully implemented for thermal [9]- [12] and fast [13] neutron detection. The neutrons in doped microchannel plates are absorbed within the entire volume of the MCP glass, in contrast to Soller slit collimators, where the absorption only occurs in a thin film deposited on a non-absorbing substrate.…”

Section: Introductionmentioning

confidence: 99%

The theory of compact and efficient circular-pore MCP neutron collimators

Tremsin¹,

Feller²

2006

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

A novel type of thermal and cold neutron collimators based on microchannel plates (MCPs) doped with neutron absorbing atoms is discussed. Opposite to widely used Soller slit collimators, the microchannel plates collimate a beam of neutrons in 2 dimensions simultaneously and they are very compact. A detailed model of the circular-pore MCP collimator performance, described in this paper, can be used for optimization of MCP parameters in order to achieve the most efficient collimation for a given application.Among these parameters are the MCP geometrical dimensions, the type of absorbing atoms and their concentration in the MCP glass mixture, all constrained by the manufacturing limitations. The model predicts that the MCP collimators can be very efficient (rocking curve <0.1 o wide with high background suppression in the wings) and very compact (only few mm thick). In addition to collimation, the same microchannel plates can also be used for neutron imaging with a high spatial (~20 µm) and temporal * Corresponding author. E-mail address: ast@ssl.berkeley.edu (A.S. Tremsin) (~1 µs) resolution, opening up new possibilities for simultaneous beam collimation and monitoring.

show abstract

“…than some other detectors [13,26], it is by a factor of more than 10 higher than the fast neutron. The impact of the gamma background on the FNR image is very serious since almost no neutron beam comes without a significant gamma contamination.…”

Section: Jinst 13 P05034mentioning

confidence: 88%

“…A favorable detection efficiency and spatial resolution (sub-mm) have been achieved by Mor's detector and it has been used in the study of the air-water two-phase flows [11,12]. A large area MCP with amorphous silicon pixel array readout is proposed by Richard M. Ambrosi et al [13]. Their simulations show that the detector's efficiency can be significant high when the thickness of the MCP is several centimeters.…”

Section: Introductionmentioning

confidence: 99%

Simulation and design of a fast neutron radiography detector based on MCP

Ran

et al. 2018

J. Inst.

View full text Add to dashboard Cite

A: A fast neutron detector, consisting of a high-density polyethylene sheet, a micro-channel plate, a phosphor screen, a reflection mirror and a CCD camera, is proposed for fast neutron radiography purpose. To optimize the design of the detector, a series of simulations are performed by using Geant4 code. Simulation results indicate that the maximum conversion efficiency of the high-density polyethylene is about 0.38% when its thickness is 2 mm. To ensure the spatial resolution of the detector, the distance between high-density polyethylene and micro-channel plate should be as small as possible. The gap between MCP and PS is selected as 2 mm with a bias voltage of −4 kV to balance the luminescence efficiency and the spatial resolution of the PS. With the optimized structure, the detection efficiency of the detector is calculated to be 0.14% and the spatial resolution is possibly better than 500 µm. K: Detector modelling and simulations I (interaction of radiation with matter, interaction of photons with matter, interaction of hadrons with matter, etc); Neutron detectors (cold, thermal, fast neutrons); Neutron radiography 1Corresponding author.

show abstract

Large area microchannel plate detector with amorphous silicon pixel array readout for fast neutron radiography

Cited by 14 publications

References 16 publications

The physics of solid-state neutron detector materials and geometries

The physics of solid-state neutron detector materials and geometries

The theory of compact and efficient circular-pore MCP neutron collimators

Simulation and design of a fast neutron radiography detector based on MCP

Contact Info

Product

Resources

About