A new multi-grid type MSGC with pad readout
A new multi-grid type MSGC with pad readout
复制标题
具有焊盘读数功能的新型多网格 MSGC
DOI：
10.1016/s0168-9002(01)00970-6
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发表时间：
2001
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. Yokoi;K. Yano;D. Fukuda;M. Nakazawa;K. Hasegawa
最近，人们提出了一种新的多网格型MSGC。在阳极和阴极之间，在这种新型的MSGC中放置了额外的栅条。这些带材之间的间隙被选择为10μm左右，这确保了表面电荷的有效去除，即使不需要较低的表面电阻率，裸玻璃的使用量可高达106cps/mm~2。MSGC的另一个特点是其高增益能力。由于存在其他较低电位的带状探测器，因此与阳极带相对的栅极周围的场强并不像传统的小间隙探测器那样高。此外，由于中间栅极屏蔽了平行于表面的电场，极大地抑制了表面流光的贡献。然而，附加电极的存在也屏蔽了衬底上方的所有电场，我们无法从衬底的背面观察到诱导信号。为了克服这一困难，我们提出了另一种使用图案化方法的信号读出方法。在M-MSGC的表面上，浮动垫被放置在靠近阴极条的位置，感应电荷通过垫被读出。如果焊盘的面积足够大，并且正电荷正向焊盘移动，则背面电极可以感觉到感应电荷。焊盘上收集的电荷通过表面电阻率泄漏。进行了基本实验，成功地读出了阴极带上的位置。
Recently, a new multi-grid type MSGC has been proposed. Between the anode and the cathode, additional grid strips are placed in this new type of MSGC. Gaps between these strips are chosen to be around 10 μm which assure efficient removal of surface charges which even do not need the lower surface resistivity and bare glass can be used up to 106cps / mm2. Another feature of the MSGC is its high gain capability. Owing to the existence of other strips of lower potentials, the field strength around the opposing grid to the anode strip is not so high as conventional small gap detectors. Furthermore, the contribution of the surface streamer is greatly suppressed because the electric field parallel to the surface is screened by the intermediate grid electrodes. However, the existence of additional electrodes also screens all the electric field upper than the substrate and we cannot observe induced signals from backside of the substrate. To overcome the difficulty, we propose another signal readout method using patterning approach. Floating pads are placed close to the cathode strip on the surface of the M-MSGC and induced charges are read out via the pads. If the area of pads is sufficiently large and the positive charges are moving toward the pads, backside electrodes can sense the induced charge. Collected charges on the pads are leaked through the surface resistivity. The basic experiment has been performed and the readout of the position along the cathode strips is successfully ensured.