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将235U与238U两种材料组成的裂变电离室作为散裂中子源反角方向束流监视系统应用的探测器,采用飞行时间方法可以高精度地测量束流的能谱。本文主要介绍整个系统的时间分辨精度对能量分辨的影响以及实际测量中的修正因素,时间分辨引起的能量分辨与能量的3/2幂成正比,能量分辨引起与标准截面的能量差异的修正小于0.1%,实验结果表明该项裂变电离室的设计能满足散裂反角中子能谱测量的要求。
The fission ionization chamber consisting of two materials, 235U and 238U, is used as the detector for the anti-angle beam monitoring system of spallation neutron source. The time-of-flight method can measure the energy spectrum of the beam with high accuracy. This paper mainly introduces the influence of the time resolution accuracy of the whole system on the energy resolution and the correction factors in the actual measurement. The energy resolution caused by the time resolution is directly proportional to the power of 3/2. The energy resolution of the energy difference from the standard cross section is less than 0.1%. The experimental results show that the design of this fission ionization chamber can meet the requirements of spalling and contracting neutron energy spectrum measurement.