Development of a multi-grid type microstrip gas chamber
Development of a multi-grid type microstrip gas chamber
复制标题
多栅型微带气室的研制
DOI：
10.1109/nssmic.2000.949080
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
K. Hasegawa
中科院分区：
文献类型：
--
作者：
H. Takahashi;K. Yokoi;K. Yano;D. Fukuda;M. Nakazawa;K. Hasegawa
传统的MSGCs存在着气体增益低、易产生火花等问题，为了克服这些困难，我们提出了一种新型的多栅型MSGCs（M-MSGC）。在这种新型MSGC的阳极和阴极之间插入了新的栅条。这些条之间的间隙非常小，例如/spl sim/10 /spl mu/m，其中可以有效地去除表面电荷。由于存在电势低于阳极的栅条，与传统的小间隙MSGCs相比，阳极条的相邻栅周围的场强变得非常小。由于栅电极减小了平行于表面的电场，表面流注对损伤的贡献被大大抑制。然而，栅极的存在也屏蔽了整个电场高于衬底，我们不能观察到来自衬底背面的感应信号。为了克服这个困难，我们开发了一种使用另一种图案化方法的信号读出方法。浮置垫放置在M-MSGC表面的阴极条附近，感应电荷通过浮置垫读出。如果焊盘的面积足够大并且正电荷正向焊盘移动，则背电极可以获得感应电荷。在焊盘上收集的电荷通过表面电阻泄漏。已经进行了实验，并成功地观察到背面信号通过2.3毫米厚的玻璃读出的位置沿着阴极条。
Conventional MSGCs have suffered from many difficulties such as low gas gains and sparking, etc. We have proposed a new multi-grid type MSGC (M-MSGC) in order to overcome the difficulties. New grid strips are inserted between the anode and the cathode in this new type of MSGC. Gaps between these strips are very small such as /spl sim/10 /spl mu/m where one can effectively remove surface charges. Owing to the existence of grid strips of lower potentials than the anode, the field strength around the neighboring grid to the anode strip becomes very small compared with conventional small gap MSGCs. The contribution of the surface streamer to the damage is greatly suppressed because the grid electrodes decrease the electric field parallel to the surface. However, the existence of grid electrodes also screens the entire electric field upper than the substrate and we cannot observe induced signals from backside of the substrate. To overcome the difficulty, we develop a signal readout method using another patterning approach. Floating pads are placed near the cathode strip on the surface of the M-MSGC and the induced charges are read out through the pads. If the area of pads is sufficiently large and the positive charges are moving toward the pads, backside electrodes can obtain the induced charge. Collected charges on the pads are leaked through the surface resistance. An experiment has been performed and the backside signal through 2.3-mm thick glass readout of the position along the cathode strips is successfully observed.