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Calculations to support JET neutron yield calibration : Contributions to the external neutron monitor responses
Snoj, Luka, 1981- ...
Neutron yield measurements are the basis for the determination of theFrom the modelling we find that a minority of the neutrons hitting the fission chamberspenetrate the tokamak wall, whilst most ...come via the ports. The highest contribution to a fission chamber response comes via the port nearest to a point neutron source and the second highest contribution comes via the next nearest ports. If the port is blocked by a massive object, the fission chamber response is decreased by up to the contribution of that port. It was observed that the torus hall wall significantly affects the response of each external fission chamber due to back scattering of neutrons. absolutefusion reaction rate and the operational monitoring with respect to the neutron budget during any campaign for JET, the Joint European Torus.The whole process of understanding and improving the knowledge of the neutron yield calibration for JET is of great interest for ITER, where the methods andprocedures for calibrating the neutron yield monitors are still being developed, but the requirement is for 10% accuracy in the fusion yield determination, as it is in JET. After the 2010 changes of the JET plasma-facing materials (Carbon wall to ITER-Like Wall transition), confirmation of the neutron yield calibration willbe ensured by direct measurements using a calibrated 252Cf neutron source deployed inside the JET vacuum vessel. In order to thoroughly understand the transport of neutrons from the vacuum vessel to the fission chamber detectors mounted outside the vessel on the transformer limbs and thus to computationally support the JET neutron calibrations project, we developed a simple but quick-running computational model of the JET tokamak for performingMonte Carlo neutron transport calculations.
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