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Development of a tritium compatible mass spectrometer.

开发氚兼容质谱仪。

基本信息

批准号：
61880019
负责人：
WATANABE Kuniaki
金额：
$ 6.91万
依托单位：
Toyama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

项目摘要

Tritium exposure gives rise to considerable increase in the noise of mass spectrometers. To avoid this imparirment and apply the mass spectrometer to tritium handling system for D-T burning fusion devices, we developed a tritium compatible quadrupole mass spectrometer equipped with tritium decontamination devices< Possible parts of the mass spectrometer were coated with gold to reduce the adsorption of tritium.It was observed that the noise level and width of the mass spectrometer increased with tritium exposure: namely, the noise level and width increased to 1E-9 and 5E-11 Amp., respectively, owing to cumulative tritium exposure of 0.1 Torr.sec. The increase in the noise level was about 100 times and that in the width was about 30 times of the initial one. It was confirmed that the increase in the noised due to the tritium adsorbed on the surfaces of inner wall of the vacuum system, quadrupole and detector itself: the tritium in gasphase playd only a minor role. The noise level and width could not be effectivly reduced by simple evacuation at room temperature. On the other hand, it was revealed that photon irradiation by halogen lamp caused to reduce both of the noise level and width to 2E-10 and 1.5E-11 Amp., respectively. They were about 1/15 or those of a conventional quadrupole mass spec- trometer after decontamination with similar procedures. The photon irradiation by mercury lamp acted similarly. The decontamination is not due to thermal effect but to photon induced desorption. These results indicate the mass spectrometer developed in the present study is compatible to carrier free tritium because the tritium contamination can be removed in-situ by photon irradiation to reduce the nose of the mass speqtrometer, although the improvement of the pumpling system and photon irradiation device should be required.

氚暴露引起质谱仪噪声的显著增加。为了避免这一缺陷，并将质谱计应用于氘氚燃烧聚变装置的氚处理系统，我们研制了一台氚兼容的四极质谱计，并配备了氚去污装置。即，噪声水平和宽度增加到1 E-9和5E-11分贝，分别，由于累积氚暴露0.1 Torr. sec。噪声水平增加了约100倍，宽度增加了约30倍。结果表明，氚在真空系统内壁、四极和探测器表面上的吸附对噪声的增加起了一定的作用，气相中的氚只起很小的作用。在室温下，单纯的排气不能有效地降低噪声级和宽度。另一方面，揭示了卤素灯的光子照射导致噪声水平和宽度均降低至2 E-10和1.5E-11 Ω。分别它们约为常规四极杆质谱仪经类似程序去污后的1/15。水银灯的光子照射也有类似的作用。去污不是由于热效应，而是由于光子诱导脱附。这些结果表明，在本研究中开发的质谱仪是兼容的无载体氚，因为氚污染可以通过光子辐照去除原位，以减少鼻子的质谱仪，虽然泵系统和光子辐照装置应进行改进。