用被动双极栅测量离子阻塞
Measurement of the ion blocking by the passive bi-polar grid
摘要：
离子回流是以高事件率操作时间投影室的主要限制因素。许多实验组投入了大量的精力来解决这个问题。本文探讨了一种基于操作无源双极线栅的解决方案。在存在磁场的情况下，栅极比通过栅极的电子电流更有效地衰减离子电流。对于不同的气体混合物和磁场的大小，测量栅极对电子和离子的磁阻。结果表明，在足够强的磁场中，双极线栅可以作为一种有效的、独立的装置来抑制时间投影室中的离子回流。
英文摘要：
The ion backflow is the main limiting factor for operating time projection chambers at high event rates. A significant effort is invested by many experimental groups to solve this problem. This paper explores a solution based on operating a passive bi-polar wire grid. In the presence of the magnetic field, the grid more effectively attenuates the ion current than the electron current going through it. Transparencies of the grid to electrons and ions are measured for different gas mixtures and magnitudes of the magnetic field. The results suggest that in a sufficiently strong magnetic field, the bi-polar wire grid can be used as an effective and independent device to suppress the ion backflow in time projection chambers.
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