<PLENARY SESSION>Submitting to International Symposium on Fusion Nuclear Technology

概要

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Tritium exposure gives rise to considerable increase in the noise of mass spectrometer. To avoid this impairment and apply the mass spectrometer to D-T burning fusion devices, we developed a tritium compatible quadrupole mass spectrometer with tritium decontamination devices. It was observed that the nolse level and width increased with tritium exposure : namely, the nolse level increased to 100 times of the initial one owing to a oumulatlve tritium expesure of 0.1 Torr・sec. The Increase in the nolse width. on the other hand, was about 30 times. It was confiraed that the increase in the noises is due to the tritium adsorbed on the surfaces of inner wall of the vacuum system, quadrupole and detaotor itself : the tritium in gas phase played only a minor role. The noise level and width could not be effectively reduced by simpie 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. The photon irradiation by mercury lamp acted similarly. The decontamination (l.e. removal of the adsorbed tritium) is not due to thermal effect but to photon induced desorption. Those results indicate that the tritium contamination of the mass spectrometer can be removed in-situ by photon irradiation, although the improvement of the pumping system and photon irradiation device should be required.
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