SIMULATION OF NEUTRON ENCODE IMAGING WITH (MICRON-LEVEL)LIQUID SCINTILLATOR FILLED CAPILLARY ARRAY
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1 LSC 2017 Advances in Liquid Scintillation Spectrometry, 1-5 May 2017 Copenhagen SIMULATION OF NEUTRON ENCODE IMAGING WITH (MICRON-LEVEL)LIQUID SCINTILLATOR FILLED CAPILLARY ARRAY Leifeng Cao, Jian Teng, et.al Laboratory for Plasmas Science & Technology Laser Fusion Research Center, CAEP Tel: ; Fax: ;
2 SUMMARY Neutron coded imaging system with micron-level liquid scintillator filled capillary array detector was suggested. In comparison with conventional design, the new system may reach higher resolution. Difficulties and/or challenges to realize the suggested system were also listed.
3 OUTLINE Interaction of neutron with liquid filled scintillator Neutron encoded imaging applied in inertial confinement fusion experiment Neutron encoded imaging system with micron-level liquid filled capillary array Difficulties, challenges to be faced Conclusion
4 OUTLINE Interaction of neutron with liquid filled scintillator Neutron encoded imaging applied in inertial confinement fusion experiment Neutron encoded imaging system with micron-level liquid filled capillary array Difficulties, challenges to be faced Conclusion
5 INTERACTION OF NEUTRON WITH (BULK) LIQUID SCINTILLATOR 1. A fast neutron shots in to the LS rich of hydrogen 2. An energetic recoil proton may generated 3. The recoil proton flies in the LS and lost its energy, and emits fluorescence photons, lighting the whole space of the LS
6 INTERACTION OF NEUTRON WITH LIQUID SCINTILLATOR FILLED CAPILLARY ARRAY LS filled in glass capillary with small refractive index Fluorescence light generated may be transferred along the tube to two opposite direction
7 OUTLINE Interaction of neutron with liquid filled scintillator Neutron encoded imaging applied in inertial confinement fusion experiment Neutron encoded imaging system with micron-level liquid filled capillary array Difficulties, challenges to be faced Conclusion
8 BRIEF INTRODUCTION OF LASER-DRIVEN INERTIAL CONFINEMENT FUSION Size of fusion core region :~ 50 micron
9 NEUTRON PENUMBRAL IMAGING:COMMON USED METHOD FOR FUSION REACTION REGION DETECTION
10 NEUTRON PENUMBRA IMAGING:STATE OF THE ART Distance from Target to encode aperture Distance from encode aperture to detector Material of aperture Features of aperture Aperture Size Pixel number of detector Pixel size Final resolution 265mm 28020mm Au Resolution of 15 micron is not good enough, ones expects to <=5 micron 200mm in thickness 273 micron,300mcron,437micron 640X micron in diameter 15 micron
11 FACTORS AFFECTING THE IMAGE RESOLUTION L 0, Detector resolution, Magnification
12 RESOLUTION CALCULATION Let: FOV=200μm,μ=0.35/cm,L1=1300cm µm 400µm 100µm µm 20µm 10µm δ s (µm) δ s (µm) L 0 (cm) L 0 (cm) Let: pixel size = 20 micron, L0=110cm, one can get a resolution reach to 2.5 micron
13 SIMULATION WITH 20 MICRON DETECTOR 6mrad,2e8 neutrons,two round point with diameter of 2 micron, the between distance is 20 micron y/cm x/cm y/cm x/cm y/cm x/cm
14 NATURAL IDEA
15 OUTLINE Interaction of neutron with liquid filled scintillator Neutron encoded imaging applied in inertial confinement fusion experiment Neutron encoded imaging system with micron-level liquid filled capillary array Difficulties, challenges to be faced Conclusion
16 RECOIL PROTON MOTION IN SCINTILLATOR
17 MAIN IDEA: DECREASE CAPILLARY DIAMETER From 250 micron to 20 micron
18 HOUGH TRANSFORM: RECONSTRUCTION OF NEUTRON S POSITION The position of the neutron The position of the neutron Bragg peak
19 SIMULATION: 20 MICRON CAPILLARY 6mrad,2e8 neutron inside; Detector size: 5cm X 5cm
20 SIMULATION: FROM 2MICRON TO 20 MICRON 6mrad,2e8 neutron inside; Detector size: 5cm X 5cm
21 SUMMARY OF THE SUGGESTION: SCHEME TO REALIZE 2.5 MICRON RESOLUTION Generate capillary with 2 micron diameter Fill with LS Detect neutron fairs Reconstruct neutrons positions With Hough transform algorithm Binning to 20 micron resolution data Reconstruct neutron image with deconvolution
22 OUTLINE Interaction of neutron with liquid filled scintillator Neutron encoded imaging applied in inertial confinement fusion experiment Neutron encoded imaging system with micron-level liquid filled capillary array Difficulties, challenges to be faced Conclusion
23 CHALLENGE & POSSIBLE SOLUTION Large area capillary array 2 micron diameter Large thickness: >1 cm Ultra high aspect ratio: 5000:1 Ultra large pixel number ICCD with ultra resolution of 2 micrometer. All above are not exist at present Future, lets see
24 OUTLINE Interaction of neutron with liquid filled scintillator Neutron encoded imaging applied in inertial confinement fusion experiment Neutron encoded imaging system with micron-level liquid filled capillary array Difficulties, challenges to be faced Conclusion
25 CONCLUSION Neutron coded imaging system with micron-level liquid scintillator filled capillary array detector was suggested. In comparison with conventional design, the new system may realize higher resolution. Difficulties and/or challenges to realize the suggested system were also listed.
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