This paper presents the advancement of a program being carried out in view of selecting the cryogenic temperature sensors to be used in the LHC accelerator. About 10,000 sensors will be installed around the 26.6 km LHC ring, and most of them will be exposed to high radiation doses during the accelerator lifetime. The following thermometric sensors : carbon resistors, thin films, and platinum resistors, have been exposed to high neutron fluences (>10$^15$ n/cm$^2$) at the ISN (Grenoble, France) Cryogenic Irradiation Test Facility. A cryostat is placed in a shielded irradiation vault where a 20 MeV deuteron beam hits a Be target, resulting in a well collimated and intense neutron beam. The cryostat, the on-line acquisition system, the temperature references and the main characteristics of the irradiation facility are described. The main interest of this set-up is its ability to monitor online the evolution of the sensors by comparing its readout with temperature references that are in principle insensitive to the neutron radiation (i.e. Argon gas bulbs when working at about 84 K, and below 4.5 K, either helium gas bulbs or the saturation pressure of the superfluid helium bath). The resistance shifts of the different sensors at liquid helium temperatures are presented.
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机译:本文介绍了在选择LHC加速器中使用的低温温度传感器方面正在执行的程序的进展。在26.6公里的LHC环周围将安装约10,000个传感器,并且在加速器的使用寿命中,大多数传感器将暴露于高剂量的辐射下。以下温度传感器:碳电阻器,薄膜电阻器和铂电阻器,已在ISN(法国格勒诺布尔)低温辐照测试设施处暴露于高中子注量(> 10 $ ^ 15 $ n / cm $ ^ 2 $)。将低温恒温器放置在屏蔽辐照室中,在该辐照室中20 MeV氘核束撞击Be目标,从而产生良好准直且强度高的中子束。描述了低温恒温器,在线采集系统,温度参考和辐照设备的主要特性。此设置的主要兴趣在于它能够通过将其读数与原则上对中子辐射不敏感的温度参考值(例如,工作于约84 K且低于4.5的氩气灯泡)进行比较,从而在线监测传感器的变化,从而能够在线监控传感器的发展。 K,无论是氦气灯泡还是超流氦浴的饱和压力)。给出了在液氦温度下不同传感器的电阻变化。
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