Absolute calibration of the JT-60U neutron monitor using a 252Cf neutron source (abstract)a)

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<jats:p>Absolutely calibrated measurements of the neutron yield are important for the evaluation of the plasma performance such as the fusion gain Q in D-D operating tokamaks. The time-resolved neutron yield is measured with 235U and 238U fission chambers and 3He proportional counters in the JT-60U tokamak. The in situ calibration was performed by moving the 252Cf neutron source toroidally through the JT-60 vacuum vessel. Detection efficiencies of three 235U and two 3He detectors were measured for 92 locations of the neutron point source in toroidal scans at two different major radii. The total detection efficiency for the torus neutron source was obtained by the averaging the point efficiencies over the whole toroidal angle. The uncertainty of the resulting detection efficiency for the plasma neutrons is estimated to be ±11%.</jats:p>

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Details 詳細情報について

  • CRID
    1870302167772279424
  • DOI
    10.1063/1.1143666
  • ISSN
    10897623
    00346748
  • Data Source
    • OpenAIRE

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