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Fast Neutron Imaging detector: A progress report

Fast Neutron Imaging detector: A progress report. Wenxin Wang 1,2 (David Attie 2 , Paul Colas 2 , Bitao Hu 1 , Lvxing An 1 , Yonghao Chen 1 , Xiaodong Wang 1 , Chunhui Zhang 1 , Xiaodong Zhang 1 ) 1. School of Nuclear Science and Technology , Lanzhou University ,

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Fast Neutron Imaging detector: A progress report

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  1. Fast Neutron Imaging detector: A progress report Wenxin Wang 1,2 (David Attie2, Paul Colas2, Bitao Hu1, Lvxing An1, Yonghao Chen1, XiaodongWang1, Chunhui Zhang1, Xiaodong Zhang1) 1. School of Nuclear Science and Technology, Lanzhou University, Lanzhou, CHINA 2. CEA/IRFU, Gif sur Yvette, Saclay, FRANCE 8th RD51 collaboration meeting

  2. Scheme of the FNI detector Aluminized polyethylene foil (25µm) 10mm 8th RD51 collaboration meeting

  3. Structure of Fast Neutron Imaging(FNI) detector Electronics: T2K electronics (AFTER chip : 1728channel ) Detector Sensitive area 8th RD51 collaboration meeting

  4. The Structure of PCB PCB was designed by Lanzhou University. The dimension of readout PCB: Total area: 365.5 mm X 306.0 mm Sensitive area(green area): 57.4 mm X 88.6 mm Pads Number: 1,728 (36X48) PadsSize: 1.75 mm X 1.50 mm 8th RD51 collaboration meeting

  5. Cosmic-ray test in Saclay (March 2011) 8th RD51 collaboration meeting

  6. Experimental conditions (China, July 2011) • Gas mixture: Ar 95% + isobutane 5% • Pressure: 1 atm • Neutron: beam: 14Mev, 107 neutron/s (DT coll.) source: 241Am+Be -> n (1-2MeV) • Tested samples: Materials: 1.7 cm Pb and paraffine 8th RD51 collaboration meeting

  7. Data taking in China last month 8th RD51 collaboration meeting

  8. Experimental equipment (using 241Am source) 8th RD51 collaboration meeting

  9. Online Display (using 241Am source) Material: 1.7 cm Pb Chink width: 1.5mm -> 5.0 mm step: 0.5 mm Not in the sensitive area 8th RD51 collaboration meeting

  10. Online Display (using 241Am source) hole radius 2.5mm 8th RD51 collaboration meeting

  11. Online Display (using 241Am source) 8th RD51 collaboration meeting

  12. Online Display (using 241Am source) 8th RD51 collaboration meeting

  13. Future plan For reducing background: • Optimize the gas mixture (He-based) • Decrease the thickness of gas wall and improve side shielding • Reduce the drift gap instead of extrapolating proton track Continue the data analysis to reconstruct images 8th RD51 collaboration meeting

  14. Thanks for your attention! 8th RD51 collaboration meeting

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