用于KATRIN的Laser拉曼系统的准确度
Accuracy of the Laser Raman system for KATRIN
摘要：
卡尔斯鲁厄氚中微子实验（英语：Karlsruhe Tritium Neutrino experiment，简称KATRIN）的目的是直接测量中微子的质量。为此目的，使用无窗气态氚源，氚通量为40克/天。为了达到0.2eV/c^{2}（90% C.L.）的设计灵敏度，氚源的关键参数，即气体入口速率和气体组成，必须稳定并监测在0.1%的水平（1 σ）。氚气体成分的任何微小变化都会对KATRIN测量产生不可忽略的影响;因此，激光拉曼光谱（LARA）是监测气体成分的首选方法，因为它是一种非侵入性和快速在线测量技术。在这些程序中，KATRIN的统计和系统的不确定性，这种方法的要求进行了讨论。将概述LARA系统在精度方面的当前性能。此外，提出了两种互补的强度校准方法。
英文摘要：
The aim of the Karlsruhe Tritium Neutrino experiment (KATRIN) is the direct (model-independent) measurement of the neutrino mass. For that purpose a windowless gaseous tritium source is used, with a tritium throughput of 40 g/day. In order to reach the design sensitivity of 0.2 eV/c^{2} (90% C.L.) the key parameters of the tritium source, i.e. the gas inlet rate and the gas composition, have to be stabilized and monitored at the 0.1% level (1 sigma). Any small change of the tritium gas composition will manifest itself in non-negligible effects on the KATRIN measurements; therefore, Laser Raman spectroscopy (LARA) is the method of choice for the monitoring of the gas composition because it is a non-invasive and fast in-line measurement technique. In these proceedings, the requirements of KATRIN for statistical and systematical uncertainties of this method are discussed. An overview of the current performance of the LARA system in regard to precision will be given. In addition, two complementary approaches of intensity calibration are presented.
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