Minimizing distortions with sectored GEM electrodes
Minimizing distortions with sectored GEM electrodes
复制标题
DOI：
10.1016/j.nima.2020.163673
复制
发表时间：
2020-03
影响因子：
1.4
通讯作者：
A. P. Marques;F. Brunbauer;H. Muller;R. Oliveira;E. Oliveri;D. Pfeiffer;L. Ropelewski;J. Samarati;F. Sauli;L. Scharenberg;L. Shang;M. Stenis;S. Williams;Y. Zhou
中科院分区：
文献类型：
--
作者：
A. P. Marques;F. Brunbauer;H. Muller;R. Oliveira;E. Oliveri;D. Pfeiffer;L. Ropelewski;J. Samarati;F. Sauli;L. Scharenberg;L. Shang;M. Stenis;S. Williams;Y. Zhou
电极分割是大面积GEM探测器的重要设计原则。它减少了放电的能量，并允许断开有缺陷或短路的扇区，但会引起局部信号失真和潜在的效率损失。我们实施并评估了一种新的设计方法，用于电极扇区之间的绝缘间隙，以尽量减少或减轻扭曲和死区。即使在电极扇区之间的绝缘区域，通过保留GEMs的空穴图案，探测器在这些区域的响应部分恢复，从而减少了畸变。用光学读出单面扇形GEMs，研究不同扇形模式对其的影响。记录的图像显示，与扇区之间的传统空白绝缘条相比，与行对齐和随机对齐的全孔有明显的改进。在涂有电阻DLC层的基板上制造的扇形GEM进行了评估，并显示可以最大限度地减少扭曲。所研究的扇区模式提供了一种在基于gem的探测器扇区之间的绝缘或电阻区域恢复信号的方法。
Electrode sectorization is an important design principle for large area GEM based detectors. It reduces the energy of discharges and permits to disconnect defective or shorted sectors, but induces a local signal distortion and a potential efficiency loss. We implemented and evaluated a new design approach for the insulating gaps between electrode sectors, to minimize or mitigate distortions and dead regions. By preserving the hole pattern of GEMs even in the insulating region between electrode sectors, the response of the detector in these regions was partly recovered resulting in reduced distortions. Single-side sectored GEMs were optically read out to study the influence of different sectorization patterns. Recorded images show a clear improvement with full holes both aligned with the rows and with a random alignment as compared to the traditional blank insulating strip between sectors. A sectored GEM manufactured on a substrate coated with a resistive DLC layer was evaluated and shown to minimize distortions. The investigated sectorization patterns provide a way of recovering signals in the insulating or resistive regions between sectors in GEM-based detectors.