Silicon detectors for monitoring neutron beams in n-TOF beamlines
Silicon detectors for monitoring neutron beams in n-TOF beamlines
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DOI：
10.1063/1.4927073
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发表时间：
2015-07-01
影响因子：
1.6
通讯作者：
Finocchiaro, P.
中科院分区：
文献类型：
--
作者：
Cosentino, L.;Musumarra, A.;Finocchiaro, P.
2014年，第二个实验区（EAR 2）在欧洲核子研究中心的n-TOF中子束设施完成（n-TOF表示通过飞行时间技术进行的中子束测量）。中子是通过溅射产生的，通过高强度的20 GeV脉冲质子束撞击厚靶。由此产生的中子束覆盖从热到几个GeV的能量范围。在本文中，我们描述了两个光束诊断设备，都利用硅探测器加上中子转换箔含有Li-6。第一个是基于四个硅垫，并允许监测中子束通量作为中子能量的函数。第二个，在束和位置敏感的硅探测器的基础上，旨在重建的束剖面，再次作为中子能量的函数。已经探索了几种电子设置，以克服与伽马闪光有关的问题，即，在每个中子束开始时存在的巨大脉冲可能会使探测器失明一段时间。这两个设备的特征是放射源，并在欧洲核子研究中心的n-TOF设施进行了测试。它们被证明能够维持的宽能量和强度范围使它们具有吸引力，适合用于EAR 1和EAR 2 n-TOF实验区域，并立即投入使用。(C)2015 AIP Publishing LLC.
During 2014, the second experimental area (EAR2) was completed at the n-TOF neutron beam facility at CERN (n-TOF indicates neutron beam measurements by means of time of flight technique). The neutrons are produced via spallation, by means of a high-intensity 20 GeV pulsed proton beam impinging on a thick target. The resulting neutron beam covers the energy range from thermal to several GeV. In this paper, we describe two beam diagnostic devices, both exploiting silicon detectors coupled with neutron converter foils containing Li-6. The first one is based on four silicon pads and allows monitoring of the neutron beam flux as a function of the neutron energy. The second one, in beam and based on position sensitive silicon detectors, is intended for the reconstruction of the beam profile, again as a function of the neutron energy. Several electronic setups have been explored in order to overcome the issues related to the gamma flash, namely, a huge pulse present at the start of each neutron bunch which may blind the detectors for some time. The two devices were characterized with radioactive sources and also tested at the n-TOF facility at CERN. The wide energy and intensity range they proved capable of sustaining made them attractive and suitable to be used in both EAR1 and EAR2 n-TOF experimental areas, where they became immediately operational. (C) 2015 AIP Publishing LLC.