Development of Prototype Neutron Flux Monitor for ITER

The prototype neutron flux monitor consists of a high purity 235U fission chamber detector and a 'blank' detector, which is a fissile material free detector with the same dimension as the fission chamber detector to identify noise issues such as noise coming from gamma rays. The main parameters of the fission chamber assembly that have been measured in the laboratory are confirmed to approach the technological level of the International Thermonuclear Experimental Reactor (ITER) in the near future. This prototype neutron flux monitor will be further developed to become a neutron flux monitor suitable for the operation phase of D-D fusion on the ITER.

NFM在ITER中的中子学计算

NFM是一种重要的中子学诊断设备。它可以对ITER聚变中子产额进行实时测定。ITER在运行过程中子产额高达1021n/s,因此对放入其中的设备均需进行相关的中子学计算。采用MCNP程序,用MCAM构建了NFM模型,并将它放入ITER40度模型中进行相关中子学计算。最终得到NFM所在位置的中子和光子能谱分布,NFM中裂变材料的裂变速率,主要部件的能量沉积和温升效应。