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FNI Meeting

Outlines: Current status of FNI detector and results New designs of neutron convertor New material for collimator: Boron-loaded Polyethylene Discussion: Next step test with Am-Be neutron source. FNI Meeting. Current results. The Imaging are mainly come from X-rays. Current results.

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FNI Meeting

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  1. Outlines: Current status of FNI detector and results New designs of neutron convertor New material for collimator: Boron-loaded Polyethylene Discussion: Next step test with Am-Be neutron source FNI Meeting

  2. Current results The Imaging are mainly come from X-rays

  3. Current results • Thickness of paraffin: 5cm， • Diameter of hole: 7mm • X and gamma rays are shielded by Lead(front and back). The unclear imaging of the hole is caused by: very low detection efficiency of the detector for neutron; Cosmic muon’s influence.

  4. Current design Neutron Events X and gamma rays events

  5. Current Design -- Conclusion • Neutrons are detected by FNI detector; • No clear neutron imaging, the reason is caused by the low detection efficiency and cosmic muon’s influence; • Detection efficiency need to be improved; • With 200 um polyethylene: 0.06% • New design: 10% (estimated, in principle, if the thicker structure used, the detection efficiency can be higher)

  6. 2. New Convertor Design-- two ideas Design2: Polyethylene with hole. Top and bottom covered by metal/copper which Served as electrodes. Design 1: Polyethylene pillars (Blue). Top and bottom are metal mesh, which are served as electrodes. Note: Huaya is doing the simulation of this new ideas and optimize the dimensions.

  7. 2. New convertor design-- conversion efficiency LvxingAn’s Simulation results: Energy of incident neutron: 2 MeV Convertor: bulk Polyethylene Conclusion: Based this simulation, the diameter of the pillar and the thickness of the wall in the new design should be chosen about 200 um for 2 MeV neutron. But for the 14 MeV neutron, it should be chosen more thicker than this value. The value will be obtained soon.

  8. 3. New collimation material-- Boron-loaded polyethylene

  9. 4. Next step test Continue testing it with Am-Be neutron source Once it is done, test it with 14 MeV neutrons

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