Development and construction of the Belle II DEPFET pixel detector
Development and construction of the Belle II DEPFET pixel detector
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Belle II DEPFET 像素探测器的开发和构建
DOI：
10.22323/1.287.0011
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
B. Schwenker
中科院分区：
文献类型：
--
作者：
B. Schwenker
日本调味品工厂（KEKB）的新加速器的建设已经完成，其检测器（贝儿~II）计划于2017年初投入使用。这台新的e$^{+}$e$^{-}$机器（“SuperKEKB”）将提供8\times10 ^{35}\mathrm{~cm}^{-2}\mathrm{s}^{-1}$的瞬时光度，比KEKB创造的世界纪录高出40倍。
为了能够充分利用增加的事件数量，并在如此恶劣的环境中提供B介子系统衰变顶点的高精度测量，贝儿~II探测器将包括一个新的硅顶点探测器，基于DEPFET技术。新的像素探测器位于相互作用点附近，由两层有源像素传感器组成。DEPFET技术通过在每个像素上将场效应晶体管集成到完全耗尽的硅体中来组合检测和像素内放大。在贝儿~II，DEPFET传感器减薄到75~$\μ $m，低功耗和低固有噪声将被使用。本文综述了近年来的研究成果和建设现状。小的原型矩阵的性质与接近最终读出ASIC电子操作的特点。特别是从一个组合的测试梁与全尺寸矩阵的结果进行了描述。
The construction of the new accelerator at the Japanese Flavour Factory (KEKB) has been finalized and the commissioning of its detector (Belle~II) is planned by early 2017. This new e$^{+}$e$^{-}$ machine ("SuperKEKB") will deliver an instantaneous luminosity of $8\times10^{35}\mathrm{~cm}^{-2}\mathrm{s}^{-1}$, which is 40 times higher than the world record set by KEKB.
In order to be able to fully exploit the increased number of events and provide high precision measurements of the decay vertex of the B meson systems in such a harsh environment, the Belle~II detector will include a new silicon vertex detector, based on the DEPFET technology. The new pixel detector, located close to the interaction point, consists of two layers of active pixel sensors. The DEPFET technology combines the detection and the in-pixel amplification by the integration, on every pixel, of a field effect transistor into a fully depleted silicon bulk. In Belle~II, DEPFET sensors thinned down to 75~$\mu$m with low power consumption and low intrinsic noise will be used. In this paper, an overview of the latest results and the construction status are presented. Properties of small prototype matrices operated with close to final readout ASIC electronics have been characterized. In particular results from a combined test beam with full-size matrices are described.