Study of the backside signal of micro-strip gas counters on electronic conducting glass
Study of the backside signal of micro-strip gas counters on electronic conducting glass
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电子导电玻璃微带气体计数器背面信号研究
DOI：
10.1109/nssmic.1997.672588
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
A. Oed
中科院分区：
文献类型：
--
作者：
G. Cicognani;D. Feltin;B. Guérard;A. Oed
在Schott S8900等电子导电玻璃上的微带气体计数器（MSGC）具有非常稳定的长时间行为。然而，这种玻璃只能在相对较厚的板上使用。较厚的衬底会使携带第二位置坐标的背面电极的信号衰减，从而限制了二维探测器的性能。在本文中，我们证明了通过使用具有“开放阴极”的结构，其中每个阴极的中心区域都是非金属化的，可以通过降低相对于阴极电压电位的背面电压电位来减少屏蔽效应。这种配置导致背面信号的显著增加，当阴极没有连接到外部电位时，背面信号的幅度甚至等于阳极信号的幅度。由于阴极条在这种模式下对放大过程没有贡献，这自然导致了阴极完全被移除的结构。除了改善背面信号外，这种新型探测器设计的另一个优点是可以实现非常高的气体放大系数。然而，当离子由电流通过衬底放电时，由该电流引起的电压降导致计数率依赖于气体放大因子。
Microstrip gas counters (MSGC) on electronic conducting glass such as Schott S8900 have a very stable long time behaviour. However, this glass is available in only relatively thick plates. A thick substrate limits the performances of two-dimensional detectors by attenuating the signal of the backside electrode which carries the second position coordinate. In this paper we demonstrate that by using a structure with "open cathodes", where the central area of each cathode is non metallized, it is possible to reduce the screening effect by decreasing the backside voltage potential with respect to the cathode voltage potential. This configuration results in a significant increase of the backside signal, whose amplitude becomes even equal to that of the anode signal when the cathodes are not connected to an external potential. As the cathode strips do not contribute to the amplification process in this mode, this leads naturally to a structure where the cathodes are removed entirely. Besides the improvement of the backside signal, another advantage of this new detector design is the very high gas amplification factor that one can achieve. However, as the ions are discharged by a current through the substrate, the voltage drop caused by this current leads to a counting rate dependance of the gas amplification factor.