A procedure for the characterization of electron transmission through Frisch grids
A procedure for the characterization of electron transmission through Frisch grids
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DOI：
10.1016/j.nima.2014.10.003
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发表时间：
2015-01
影响因子：
1.4
通讯作者：
R. Bevilacqua;A. Göök;F. Hambsch;N. Jovančević;M. Vidali
中科院分区：
文献类型：
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作者：
R. Bevilacqua;A. Göök;F. Hambsch;N. Jovančević;M. Vidali
在弗里希栅极电离室中，必须特别注意工作电压，以避免弗里希栅极上不必要的电子收集。电子在栅极上的收集将导致降低的信噪比，并因此导致劣化的能量分辨率。此外，在角分布的确定中将引入系统误差。Bunemann等人[3]在由平行导线平面组成的Frisch栅极的特殊情况下推导出了最小化栅极上电子收集的理论公式。对于其他网格几何形状，不存在这样的公式，并且需要仔细的校准程序。在这里，我们描述了一个程序的特点的弗里希网格在其透明度方面的电子网格组成的网格的交叉线。
In Frisch grid ionization chambers special attention must be paid to the operating voltages in order to avoid unwanted collection of electrons on the Frisch grid. Collection of electrons on the grid will lead to a decreased signal to noise ratio and consequently a deteriorated energy resolution. Furthermore, systematic errors in the determination of the angular distribution will be introduced. Theoretical formulas for minimized collection of electrons on the grid were derived by Bunemann et al. [3] in the special case of a Frisch grid consisting of a plane of parallel wires. No such formulas exist for other grid geometries and a careful calibration procedure is needed. We describe here a procedure for characterizing the Frisch grid in terms of its transparency to electrons for a grid consisting of a mesh of crossed wires.