Author/Authors :
Parker، نويسنده , , J.D. and Harada، نويسنده , , M. and Hattori، نويسنده , , K. and Iwaki، نويسنده , , S. and Kabuki، نويسنده , , S. and Kishimoto، نويسنده , , Y. and Kubo، نويسنده , , H. and Kurosawa، نويسنده , , S. and Matsuoka، نويسنده , , Y. and Miuchi، نويسنده , , K. and Mizumoto، نويسنده , , T. and Nishimura، نويسنده , , H. and Oku، نويسنده , , T. and Sawano، نويسنده , , T. and Shinohara، نويسنده , , T. Uchikoshi T. S. Suzuki Y. Sakka، نويسنده , , J. and Takada، نويسنده , , A. and Tanimori، نويسنده , , T. and Ueno، نويسنده , , K.، نويسنده ,
Abstract :
We present a detailed study of the spatial resolution of our time-resolved neutron imaging detector utilizing a new neutron position reconstruction method that improves both spatial resolution and event reconstruction efficiency. Our prototype detector system, employing a micro-pattern gaseous detector known as the micro-pixel chamber ( μ PIC ) coupled with a field-programmable-gate-array-based data acquisition system, combines 100 μ m - level spatial and sub- μ s time resolutions with excellent gamma rejection and high data rates, making it well suited for applications in neutron radiography at high-intensity, pulsed neutron sources. From data taken at the Materials and Life Science Experimental Facility within the Japan Proton Accelerator Research Complex (J-PARC), the spatial resolution was found to be approximately Gaussian with a sigma of 103.48 ± 0.77 μ m (after correcting for beam divergence). This is a significant improvement over that achievable with our previous reconstruction method ( 334 ± 13 μ m ), and compares well with conventional neutron imaging detectors and with other high-rate detectors currently under development. Further, a detector simulation indicates that a spatial resolution of less than 60 μ m may be possible with optimization of the gas characteristics and μ PIC structure. We also present an example of imaging combined with neutron resonance absorption spectroscopy.
