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S outh W estern I nstitute of P hysics

R&D Status of NFM and Neutron Source in China. YANG Jin-wei YANG Qingwei SONG Xian-ying. S outh W estern I nstitute of P hysics. Development status of NFM MCNP calculations HL-2A Neutron monitor Calibration neutron source Primary neutron detectors for comparison calibration

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S outh W estern I nstitute of P hysics

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  1. R&D Status of NFM and Neutron Source in China YANG Jin-wei YANG Qingwei SONG Xian-ying SouthWestern Institute of Physics

  2. Development status of NFM MCNP calculations HL-2A Neutron monitor Calibration neutron source Primary neutron detectors for comparison calibration Micro-fission chamber development for Neutronics and trillium production-test blanket module Plan and summary Outline of talk

  3. Fission chamber and pre-amplifier

  4. Electronics

  5. Pulse signal of neutron

  6. Results of measurement on HL-2A tokamak using NFM

  7. Results of measurement on HL-1M tokamak using BF3

  8. pulse width is 1µs, the plateau length from 300—800V, the plateau width is 500V,and the slope of plateau is 0.9%, sensitivity:1±0.15cps/nν,insulation resistance≥1×109 ohm. Anti γ-rayradiation 2.8×10-2Gy/s This assembly has being used for photo-neutron measurement in the HL-2A tokamak Conclusion and discussion

  9. MCNP calculations • Profile of DD neutron flux • DD neutron spectrum • Profile of DT neutron flux • DT neutron spectrum • Profile of fusion power density • Deposition of fusion energy

  10. Profile of DD neutron flux

  11. DD neutron spectrum

  12. Profile of DT neutron flux

  13. DT neutron spectrum

  14. Fusion power density

  15. Fusion energy deposition

  16. Tandem:Beam current 10A; Working voltage:215MV;Energy range :7~30MeV;Pulse width:1ns;repeat rates:4MHz。 Cascade generator(1): Beam current 15A; Energy range of output neutron:0.144, 1.2, 2.5, 5.0 14.8MeV;Neutron yields:108-109n/s。 Cascade generator(2): Working voltage:600kV; Neutron yields:1011n/s Neutron Source and Calibration for Efficiencies

  17. Energy：14MeV Neutron yield:2×109n/s(available),5×1010n/s (reform) Pulse width:10μs—1ms Continued acceleration voltage:140kV Current≤400mA Life time7000h ( working home temperature) Size:76 ×1500mm(available), 100 ×800mm (reform) Portable neutron source

  18. Tandem Accelerator

  19. Cascade generator(1)

  20. Cascade generator(2)

  21. Portable neutron tube

  22. TOF spectrometer

  23. -ray coincidence spectrometer

  24. Magnetic spectrometer

  25. Neutron flux measurement for neutron source Here, N1/2 is the counts of the half area of the measured recoil proton spectrum in high energy part. The counts have been normalized to monitor counts corrected for dead time and scattering, and removed background; R is the radius of cathode of the proportional counter; σn,p is (n,p) cross section; n is the number of hydrogen atoms per cm3 in the counter; ΔI is a geometrical factor, it can be calculated by the following equation, i.e.,

  26. h1=L1/R, h2=L2/R, here, L1 and L2 are the distances from target to the front surface and the rear surface of the sensitive volume of the counter, respectively. M1/2 is the percentage of the counts of the half area of the calculated recoil proton spectrum in high energy part to the total counts.

  27. The main framework of the recoil proton proportional counter

  28. The recoil proton spectrum of 0.144MeV neutron

  29. Recoil proton spectra of 5.0MeV and 14.8MeV neutrons

  30. Main framework of the semiconductor neutron telescope

  31. Main framework of the scintillation neutron telescope

  32. Preliminary design for diagnostic of neutron flux in NT-TBM(CN HCSB)

  33. Micro-fission chamber assembly(1)

  34. Three types MFC

  35. Micro-fission chamber assembly(2)

  36. Development of low detection efficiency and wide dynamic range 235U FC operated in campbelling or current mode. Development of 238U FC. Development of electronics(low noise). Development of compact ~1011 n/s DT neutron source for NFMcalibration. Plan

  37. 谢谢Thank you

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