论文标题

在CERN的中子飞行时间设施的设计开发和实施

Design development and implementation of an irradiation station at the neutron time-of-flight facility at CERN

论文作者

Ferrari, M., Senajova, D., Aberle, O., Aguiar, Y., Baillard, D., Barbagallo, M., Bernardes, A. -P., Buonocore, L., Cecchetto, M., Clerc, V., Di Castro, M., Alia, R. Garcia, Girod, S., Grenard, J. -L., Kershaw, K., Lerner, G., Maeder, M., Makovec, A., Mengoni, A., Ornedo, M. Perez, Pozzi, F., Almagro, C. V., Calviani, M.

论文摘要

最近在欧洲粒子物理实验室(CERN)委托了一个新的寄生虫,混合场,中子为主的辐射站。该站安装在中子飞行时间(N \ _TOF)设施中,利用了中子启动目标产生的次级辐射。新站允许在辐射条件下进行辐射损伤研究,而辐射条件更接近粒子加速器操作过程中遇到的辐射研究;在车站进行的辐照测试将与通常使用伽马源执行的材料的标准测试互补。样品将暴露于每年MGY范围内的中子剂量,对N TOF设施操作的影响很小。该站具有二十四个辐照位置,每个位置都有多达100 cm3的样品材料。鉴于其靠近N \ _tof目标,在保护性屏蔽内部,辐照站及其操作程序已仔细地考虑到人员的安全性,并避免对N \ _tof设施和实验的运行产生任何不必要的影响。由于n \ _tof目标和辐照样品周围的整个区域的残留放射性,即使在N \ _TOF设施不运行时,人类操作员也禁止使用辐照站。机器人用于样品的远程安装和检索,并且根据辐射保护法规制定了处理程序的其他优化,并且目的是最大程度地减少对人员的剂量。

A new parasitic, mixed-field, neutron-dominated irradiation station has been recently commissioned at the European Laboratory for Particle Physics (CERN). The station is installed in the Neutron Time-Of-Flight (n\_TOF) facility, taking advantage of the secondary radiation produced by the neutron spallation target. The new station allows radiation damage studies to be performed in irradiation conditions that are closer to the ones encountered during the operation of particle accelerators; the irradiation tests carried out in the station will be complementary to the standard tests on materials, usually performed with gamma sources. Samples will be exposed to neutron doses in the MGy range per year, with minimal impact on the n TOF facility operation. The station has twenty-four irradiation positions, each hosting up to 100 cm3 of sample material. In view of its proximity to the n\_TOF target, inside protective shielding, the irradiation station and its operating procedures have been carefully developed taking into account the safety of personnel and to avoid any unwanted impact on the operation of the n\_TOF facility and experiments. Due to the residual radioactivity of the whole area around the n\_TOF target and of the irradiated samples, access to the irradiation station is forbidden to human operators even when the n\_TOF facility is not in operation. Robots are used for the remote installation and retrieval of the samples, and other optimizations of the handling procedures were developed in compliance with radiation protection regulations and the aim of minimizing doses to personnel.

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