Development of a new multi-grid-type microstrip gas chamber
Development of a new multi-grid-type microstrip gas chamber
复制标题
新型多栅型微带气室的研制
DOI：
10.1016/s0168-9002(01)01911-8
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发表时间：
2002
影响因子：
1.4
通讯作者：
K. Hasegawa
中科院分区：
文献类型：
--
作者：
H. Takahashi;K. Mori;K. Yokoi;D. Fukuda;M. Nakazawa;N. Yasuda;Mikio Yamamoto;K. Hasegawa
传统的msgc存在许多困难，如低气体增益和火花等。为了克服这些困难，我们提出了一种新的多网格型MSGC （M-MSGC）。在这种新型的MSGC中，在阳极和阴极之间插入了新的栅极条。这些条带之间的间隙非常小，例如/spl sim/10 /spl mu/m，可以有效地去除表面电荷。由于存在比阳极电位低的栅极条，与传统的小间隙msgc相比，阳极带附近栅极周围的场强变得非常小。由于栅极降低了与表面平行的电场，表面流光对损伤的贡献被极大地抑制了。然而，栅极的存在也将整个电场屏蔽在衬底之上，我们无法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模式方法的信号读出方法。在M-MSGC表面的阴极带附近放置浮垫，感应电荷通过浮垫读出。如果衬垫的面积足够大并且正电荷向衬垫移动，则背面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。通过实验，成功地观察到通过2.3 mm厚的玻璃读出阴极带位置的背面信号。
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.