Detection efficiency, spatial and timing resolution of thermal and cold neutron counting MCP detectors

Abstract Neutron counting detectors with boron or gadolinium doped microchannel plates (MCPs) have very high detection efficiency, spatial and temporal resolution, and have a very low readout noise. In this paper we present the results of both theoretical predictions and experimental evaluations of detection efficiency and spatial resolution measured at cold and thermal neutron beamlines. The quantum detection efficiency of a detector (not fully optimized) was measured to be 43% and 16% for the cold and thermal beamlines, respectively. The experiments also demonstrate that the spatial resolution can be better than 15 μm—highest achievable with the particular MCP pore dimension used in the experiment, although more electronics development is required in order to increase the counting rate capabilities of those

[1]  Rafael Ballabriga,et al.  Timepix, a 65k programmable pixel readout chip for arrival time, energy and/or photon counting measurements , 2007 .

[2]  John V. Vallerga,et al.  High spatial resolution neutron sensing microchannel plate detectors , 2007 .

[3]  C. Jozwiak,et al.  High spatial and temporal resolution photon/electron counting detector for synchrotron radiation research , 2007 .

[4]  Josef Uher,et al.  Neutron imaging with Medipix-2 chip and a coated sensor , 2006 .

[5]  Josef Uher,et al.  Data acquisition and processing software package for Medipix2 , 2006 .

[6]  R. G. Cooper,et al.  SNS detector plans , 2004 .

[7]  Pierre Boillat,et al.  The micro-setup for neutron imaging: A major step forward to improve the spatial resolution , 2007 .

[8]  Jason McPhate,et al.  On the possibility to image thermal and cold neutron with sub-15μm spatial resolution , 2008 .

[9]  W. B. Feller,et al.  The efficiency of thermal neutron detection and collimation with microchannel plates of square and circular geometry , 2005, IEEE Symposium Conference Record Nuclear Science 2004..

[10]  C. David,et al.  Highly absorbing gadolinium test device to characterize the performance of neutron imaging detector systems. , 2007, The Review of scientific instruments.

[11]  James F. Pearson,et al.  The direct detection of thermal neutrons by imaging microchannel-plate detectors , 1990 .

[12]  T. Holý,et al.  Neutron imaging and tomography with Medipix2 and dental micro-roentgenography , 2006 .

[13]  R. G. Downing,et al.  Efficiency optimization of microchannel plate (MCP) neutron imaging detectors. I. Square channels with 10B doping , 2005 .