High Pressure Xe Gamma Ray Detector

最初的调查人员之一，K.Masuda博士被调到名古屋大学。这项研究是由E.Shibamura和N.Hasebe教授共同完成的。Hasebe教授也于1998年9月从爱慕大学调任早稻田大学。此外，Shibamura的办公室于1999年3月底从浦和市迁至高冈谷市。1998年年中以后，在早稻田大学进行了重大实验，在不锈钢厚壳中制作了平行板式栅极电离室。研制了一种低噪声电荷灵敏前置放大器，并进行了测试。在空载时，噪声约为350个电子，在40pF时，噪声小于500个电子，这是令人满意的。1998年底，包括充气系统在内的真空系统已经建成，并观察到电离辐射的电离信号。在纯Xe气体中观察到了电子的漂移速度。1999年以后，测量了电子在高压Xe气体中的漂移速度和电子的扩散常数。有关电子漂移速度的一些结果将发表在《日经》杂志上。J.Appl.太棒了。第42卷(2003)333-334，标题为“用于高压Xe伽马射线探测器的Xe和He混合物中电子漂移速度的测量”。

One of the original investigators, Dr. K. Masuda, transferred to Nagoya University. This research was made by E. Shibamura and Prof. N. Hasebe. Prof. Hasebe also transferred from Ehime University to Waseda University on September 1998. Also, the office of Shibamura moved from Urawa-city to Koshigaya-city at the end of March 1999. After the middle of 1998 the major experiment was made at Waseda University.A parallel plate type gridded ionization chamber was made in thick enclosure made of stainless steel. A low-noise charge-sensitive preamplifier was made and tested. The noise was about 350 electrons at no load and less than 500 electrons at load of 40 pF, which was satisfactory.By the end of fiscal year 1998, vacuum system including gas-filling system was prepared and ionization signal was observed for ionizing radiation. The electron drift velocity was observed in pure Xe gas.After 1999, electron drift velocity and diffusion constant of electrons in High pressure Xe gas was measured. Some of the results in electron drift velocity will be published in Jpn. J. Appl. Phys. Vol. 42 (2003) 333-334 with the title "Measurement of Electron Drift Velocities in the Mixture of Xe and He for a High-Pressure Xe Gamma-Ray Detector".