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arXiv physics/0402054physics.ins-det
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用GEM读出的TPC中cosmic-ray径迹的分辨率研究

Resolution studies of cosmic-ray tracks in a TPC with GEM readout

R. K. Carnegie, M. S. Dixit, J. Dubeau, D. Karlen, J. -P. Martin, H. Mes, K. Sachs

摘要:

大体积TPC是未来高能直线对撞机中心跟踪探测器的首选。为了提高分辨率,正在开发一种基于微图案气体探测器的新读出器。测量了GEM TPC中宇宙线径迹的空间分辨率。我们发现,分辨率遭受如果读出垫是太宽的相对于在读出平面上的电荷分布,由于不充分的电荷共享。对于2 x 6 mm**2的窄垫,在没有轴向磁场的情况下,我们在短漂移距离处测量到100微米的分辨率。作为漂移距离的函数的空间分辨率的依赖性允许确定潜在的电子统计。我们的研究结果表明,本技术使用约一半的统计功率可从初级电子的数量。跟踪角效应如预期的那样被观察到。

英文摘要:

A large volume TPC is a leading candidate for the central tracking detector at a future high energy linear collider. To improve the resolution a new readout based on micro-pattern gas detectors is being developed. Measurements of the spatial resolution of cosmic-ray tracks in a GEM TPC are presented. We find that the resolution suffers if the readout pads are too wide with respect to the charge distribution at the readout plane due to insufficient charge sharing. For narrow pads of 2 x 6 mm**2 we measure a resolution of 100 micometer at short drift distances in the absence of an axial magnetic field. The dependence of the spatial resolution as a function of drift distance allows the determination of the underlying electron statistics. Our results show that the present technique uses about half the statistical power available from the number of primary electrons. The track angle effect is observed as expected.

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