共面栅辐射探测器中的有效电荷收集
Efficient Charge Collection in Coplanar Grid Radiation Detectors
摘要：
我们模拟了辐射共面栅探测器中的激光感应瞬态电流波形。用有限元法求解泊松方程，利用Shockley-Ramo定理得到光生电荷诱导的电流。用蒙特卡罗模拟模拟了光谱对辐射通量的响应。我们展示了10个$\times$改进的共面栅格探测器使用差分信号感测的光谱分辨率。我们模拟的电流波形依赖于掺杂，耗尽宽度，扩散和探测器屏蔽和它们的相互依赖关系的探测器优化方面进行了讨论。数值模拟成功地与实验数据进行了比较，并提出了进一步的模型简化。电极下方的空间电荷和共面栅网阳极上的非均匀电场是激光诱导瞬态电流波形的主要贡献。
英文摘要：
We have modeled laser-induced transient current waveforms in radiation coplanar grid detectors. Poisson's equation has been solved by finite element method and currents induced by photo-generated charge were obtained using Shockley-Ramo theorem. The spectral response on a radiation flux has been modeled by Monte-Carlo simulations. We show 10$\times$ improved spectral resolution of coplanar grid detector using differential signal sensing. We model the current waveform dependence on doping, depletion width, diffusion and detector shielding and their mutual dependence is discussed in terms of detector optimization. The numerical simulations are successfully compared to experimental data and further model simplifications are proposed. The space charge below electrodes and a non-homogeneous electric field on a coplanar grid anode are found to be the dominant contributions to laser-induced transient current waveforms.
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