A radioactive ion beam facility using photofission
A radioactive ion beam facility using photofission
复制标题
使用光裂变的放射性离子束设施
DOI：
10.1016/s0168-9002(99)00492-1
复制
发表时间：
1999
影响因子：
1.4
通讯作者：
W. Diamond
中科院分区：
文献类型：
--
作者：
W. Diamond
提出了使用高功率电子直线加速器作为放射性离子束(RIB)装置的驱动加速器。用优化的~(235)U靶产生30 MeV、100kW的电子束，可产生近5×10~(13)裂变/S，其中约60%来自天然铀靶。电子束可以很容易地通过加速器真空系统出口处的薄窗传输，并通过空气短距离传输到水冷的韧致辐射产生靶。韧致辐射反过来可以通过空气传输到同位素生产目标。这将加速器真空系统、韧致辐射靶标和同位素生产靶标分开，减少了远程操作问题。电子束可以在很大的靶区上扫描，以降低韧致辐射和同位素生产目标上的功率密度。这些特点解决了高功率肋骨设施最紧迫的技术挑战之一，即在靶中产生具有合理功率密度的丰中子离子的高产额。符合要求规格的电子直线加速器的成本，包括设施屏蔽，比任何其他可以产生类似裂变产额的主束加速器的成本要低得多。高功率电子直线加速器也可以用于多箔氦喷射靶。大量的薄铀箔可以用扫描的韧致辐射光束和在气溶胶装载的氦中捕获的裂变碎片照射，并被输送到一个离子源，该离子源远离主要目标的强烈辐射场。裂变产额将不到厚靶的1%，但这种方法可能是在辐射安全问题可控的情况下获得可用产额的最简单的技术解决方案。
Use of a high-power electron linac as the driver accelerator for a Radioactive Ion Beam (RIB) facility is proposed. An electron beam of 30MeV and 100kW can produce nearly 5×1013fissions/s from an optimized235U target and about 60% of this from a natural uranium target. An electron beam can be readily transmitted through a thin window at the exit of the accelerator vacuum system and transported a short distance through air to a water-cooled Bremsstrahlung-production target. The Bremsstrahlung radiation can, in turn, be transported through air to the isotope-production target. This separates the accelerator vacuum system, the Bremsstrahlung target and the isotope-production target, reducing remote handling problems. The electron beam can be scanned over a large target area to reduce the power density on both the Bremsstrahlung and isotope-production targets. These features address one of the most pressing technological challenges of a high-power RIB facility, namely the production of high yields of neutron-rich ions with reasonable power density in the target. The cost of an electron linac of the required specifications, including the facility shielding, is significantly less than the cost of any other primary-beam accelerator that could produce a comparable fission yield. A high-power electron linac could also be used with a multifoil helium-jet target. A large number of thin uranium foils could be irradiated with the scanned Bremsstrahlung beam and the fission fragments captured in aerosol-loaded helium and transported to an ion source that is well removed from the intense radiation fields of the primary target. The fission yield would be less than 1% of that available from a thick target, but this approach might be the easiest technical solution to obtain useable yields with manageable radiation-safety problems.