Next generation KATRIN high precision voltage divider for voltages up to 65kV
Next generation KATRIN high precision voltage divider for voltages up to 65kV
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下一代 KATRIN 高精度分压器，电压高达 65kV
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
C. Weinheimer
中科院分区：
文献类型：
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作者：
S. Bauer;R. Berendes;F. Hochschulz;H. Ortjohann;S. Rosendahl;T. Thummler;M. Schmidt;C. Weinheimer
KArlsruhe氚中微子（KATRIN）实验旨在通过精确测量氚衰变的电子能谱，以200 meV的灵敏度确定电子反中微子的质量。这将通过使用MAC-E-Filter型的缓速光谱仪来完成。为了达到所需的灵敏度，必须在至少两个月内以3ppm的精度监测-18.6 kV的延迟电位的稳定性。由于这在商业设备上是不可实现的，根据物理技术联邦（PTB）的直流电压高达100千伏的标准分压器的概念，开发了两个ppm级的高压分压器。为了达到如此高的精度，必须考虑不同的影响。两个最重要的是电阻的温度依赖性和由绝缘体或电晕放电引起的泄漏电流。对于二次分频器，对高精度电阻和分频器的热设计进行了改进。改进的电阻器是与制造商合作的结果。本文将介绍设计改进、电阻器的研究和选择、内置纹波探头和PTB的校准。后者在两年期间的稳定性约为0.1 ppm/月。
The KATRIN (KArlsruhe TRItium Neutrino) experiment aims to determine the mass of the electron antineutrino with a sensitivity of 200 meV by precisely measuring the electron spectrum of the tritium beta decay. This will be done by the use of a retarding spectrometer of the MAC-E-Filter type. To achieve the desired sensitivity the stability of the retarding potential of -18.6 kV has to be monitored with a precision of 3 ppm over at least two months. Since this is not feasible with commercial devices, two ppm-class high voltage dividers were developed, following the concept of the standard divider for DC voltages of up to 100 kV of the Physikalisch-Technische Bundesanstalt (PTB). In order to reach such high accuracies different effects have to be considered. The two most important ones are the temperature dependence of resistance and leakage currents, caused by insulators or corona discharges. For the second divider improvements were made concerning the high-precision resistors and the thermal design of the divider. The improved resistors are the result of a cooperation with the manufacturer. The design improvements, the investigation and the selection of the resistors, the built-in ripple probe and the calibrations at PTB will be reported here. The latter demonstrated a stability of about 0.1 ppm/month over a period of two years.