KATRIN大容量空气盘管系统的电磁设计
Electromagnetic design of the KATRIN large-volume air coil system
摘要：
KATRIN实验旨在通过测量接近分子氚β衰变终点的电子能谱来确定绝对中微子质量标度，灵敏度为200 meV（90% CL）。来自高强度气态氚源的电子被几T的强磁场引导到主谱仪的分析平面，在那里在低场区域（B<0.5 mT）进行积分能量分析。通过该谱仪获得绝热电子输运的基本设计特征是围绕容器的大体积空气线圈系统。该系统有两个关键任务：调整和微调磁引导场（低场校正系统），以及补偿地球磁场的失真效应（地球磁场补偿系统）。在本文中，我们概述了这个非常大的空气线圈系统，它允许定义良好的电子传输和优化的背景减少在KATRIN主光谱仪的关键电磁设计问题。
英文摘要：
The KATRIN experiment is designed to determine the absolute neutrino mass scale with a sensitivity of 200 meV (90 % CL) by measuring the electron energy spectrum close to the endpoint of molecular tritium beta decay. Electrons from a high-intensity gaseous tritium source are guided by a strong magnetic field of a few T to the analyzing plane of the main spectrometer where an integral energy analysis takes place in a low field region (B<0.5 mT). An essential design feature to obtain adiabatic electron transport through this spectrometer is a large volume air coil system surrounding the vessel. The system has two key tasks: to adjust and fine-tune the magnetic guiding field (Low Field Correction System), as well as to compensate the distorting effects of the earth magnetic field (Earth Field Compensation System). In this paper we outline the key electromagnetic design issues for this very large air coil system, which allows for well-defined electron transmission and optimized background reduction in the KATRIN main spectrometer.
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