R&D Studies of 3-dimentional particle tracking detector using CCD device for the particle physics

在未来TeV对撞机中，短寿命粒子的顶点探测对物理分析起着至关重要的作用。CCD器件是最有前途的候选器件之一，因为它可以进行三维重建，我们研究了利用高能束线的最小电离粒子（MIP’s）的CCD跟踪器的性能。MIP的成功检测与足够的信号噪声比，甚至高达+5 ° C。位置分辨率被发现是3 μ m，这是优于在SLD实验中，4.7 μ m。我们还检查了使用强β源的辐射损伤的效果。观察到电荷转移效率（CTI）的退化。然而，它被发现是可能的，以恢复它部分通过增加驱动脉冲voltages.In调查的CTI对各种参数的行为，我们已经开发了一个复杂的模拟代码，再现照射后的数据相当不错。在使用此代码进行仔细检查后，我们已经发现，即使在室温（^-0 ℃）下，也有可能提高耐辐射性。我们还用150 ℃退火成功地消除了一个陷阱能级。这些研究结果对于CCD器件在预期的辐射环境下的真实的应用是令人鼓舞的。未来的对撞机实验

Vertex detection of short lived particles in future TeV colliders plays essential roles for the physics analyses. CCD device is one of the most promising candidates since tracks can be reconstructed 3-dimensionally.We have studied the performance of a CCD tracker using minimum ionizing particles (MIP's) from a high energy beam line. MIP's are successfully detected with sufficient signal to noise ratio even up to +5ﾟC.The position resolution is found to be 3 mu m which is better than that in the SLD experiment, 4.7 mu m.We also have examined the effect of the radiation damage using a strong beta -source. The degradation of the charge transfer inefficiency (CTI) is observed. It is, however, found to be possible to recover it partially by increasing the drive pulse voltages.In order to investigate the behavior of the CTI against various parameters, we have developed a sophisticated simulation code, which reproduces the data taken after the irradiation reasonably well. After careful examination using this code, we have found that it is possible to improve the radiation tolerance even at the room temperature (^-0ﾟC) by modifying the clocking scheme.We have furthermore succeeded in eliminating one of the trap levels by annealing with l5OﾟC.The results we have obtained from these studies are encouraging in terms of the real application of CCD device under the radiation environment which is expected in the future collider experiments.