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近几年,在无损探伤领域,中子照相技术发展非常迅猛,对中子发生器提出了体积小、寿命长、通量高、准直比高的技术要求。为此设计了一台用于快中子照相的定向高通量小型中子发生器,采用矩形结构潘宁离子源。引出的具有一定长度和流强的带状氘离子或氘氚混合离子束,在离子源与靶构成的同轴高压电场加速下,轰击对应的长形定向自成靶,发生氘氘或者氘氚反应,在靶轴线方向产生高通量、高准直比的快中子束,中子产额5×1011n/s。模拟结果表明,成像屏上的中子注量提高了两个数量级,不均匀度小于5×10-3,满足中子照相对高准直比和高通量的要求,因此成像质量高,照相时间短,工作效率高。解决了现有中子发生器体积大、有效中子通量低和靶寿命短的问题,可用于构建移动式快中子照相系统。
In recent years, in the field of non-destructive testing, the development of neutron photographic technology is very rapid, and puts forward the technical requirements for neutron generator to be small in size, long in service life, high in flux and high in collimation ratio. A directional high-flux small neutron generator for fast neutron imaging was designed for this purpose, using a rectangular structure Penning ion source. The deuterium or deuterium-deuterium or deuterium-tritium ion detonates or deuterium-tritium ions are bombarded by the corresponding elongated orientation self-forming target under the acceleration of a coaxial high-voltage electric field formed by the ion source and the target. The neutron yield of 5 × 1011 n / s was obtained by generating a high-flux and high-collimation fast neutron beam in the direction of the target axis. The simulation results show that the neutron fluence on the imaging screen is increased by two orders of magnitude and the non-uniformity is less than 5 × 10-3, which meets the requirements of neutron radiography for high collimation and high flux. Therefore, the imaging quality is high, Short time, high work efficiency. Solve the existing neutron generator bulky, low effective neutron flux and short target life, can be used to build mobile fast neutron imaging system.