Production and properties of a charging-up “Free” THGEM with DLC coating
Production and properties of a charging-up “Free” THGEM with DLC coating
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具有 DLC 涂层的充电“Free”THGEM 的生产和性能
DOI：
10.1016/j.nima.2020.163868
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发表时间：
2020-06
期刊：
影响因子：
--
通讯作者：
邵明
中科院分区：
文献类型：
--
作者：
宋国锋;邵明
THGEM探测器通常表现出增益的时间演化，这是由雪崩电荷在开放绝缘体表面上积累（充电效应）引起的。在绝缘体表面涂覆电阻层可以帮助释放电荷以克服充电效应。类金刚石碳（DLC）是一类非晶碳材料，可以用作电阻层。本研究利用磁控溅射技术在一系列THGEM上制备了电阻率稳定可控的类金刚石薄膜。用这些DLC-THGEM薄膜制作了一批单个THGEM探测器。详细测试了DLC涂层THGEM（DLC-THGEM）的气体增益，并与普通THGEM进行了比较。具有合适电阻率的DLC-THGEM显示出非常低的增益随时间的变化，并且实际上没有充电效应。然而，DLC-THGEM探测器显示出增益随着辐照速率的增加而减小。建立了一个定性的理论模型来理解增益下降。仿真结果与实验结果吻合较好。
THGEM detectors usually exhibit time-evolution of gain, caused by avalanche charges accumulating on the open insulator surfaces (charging-up effect). Coating resistive layer on the insulator surfaces may help to release the charges to overcome the charging-up effect. Diamond-like carbon (DLC), as a class of amorphous carbon material, can be used as a resistive layer. In this study, thin DLC layers with stable and controllable resistivity were coated on a series of THGEMs by magnetron sputtering technique. A batch of single THGEM detectors was fabricated with these DLC-THGEM films. The gas gain of DLC coated THGEMs (DLC-THGEM) have been tested in detail and compared with normal THGEM. DLC-THGEM with suitable resistivity show very low gain variation versus time and literally no charging-up effect. However, a DLC-THGEM detector shows a gain decrease with increasing irradiation rate. A qualitative theoretical model was built to understand the gain decrease. And the simulation results fit the experimental results well.
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