Charge collection and field profile studies of heavily irradiated strip sensors for the ATLAS inner tracker upgrade
Charge collection and field profile studies of heavily irradiated strip sensors for the ATLAS inner tracker upgrade
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用于 ATLAS 内部跟踪器升级的强辐射带状传感器的电荷收集和场分布研究
DOI：
10.1016/j.nima.2016.04.035
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Hara K
中科院分区：
文献类型：
--
作者：
Hara K
ATLAS小组评估了辐照到1×1016neq/cm2的硅微带传感器的电荷收集，超过了高亮度LHC(HL-LHC)期间带状跟踪器预期的最大值1.6×1015neq/cm2，其中安全系数为2。ATLAS12，n+-on-p型传感器是由Hamamatsu Photonics(HPK)在浮动区(FZ)衬底上制造的最新桶形传感器原型。利用穿透β射线和Alibava读出系统对辐照后的1×1 cm2炮管测试传感器的电荷收集进行了系统的评估。将在不同测量点获得的数据相互比较，并与先前ATLAS07设计获得的结果进行比较。结果非常一致，特别是当沉积电荷通过边缘瞬变电流技术(EDGE-TCT)测量得出的传感器有效厚度进行归一化时。利用β射线获得的测量结果与使用电子束的测量结果是一致的。EDGE-TCT对于评价纵深方向的场分布也是有效的。研究了辐照后的ATLAS07和ATLAS12样品之间的差异，以及不同辐射源(中子、质子和介子)辐照的样品之间的差异。对器件整体特性的研究表明，该器件可以在HL-LHC的预期注量范围内产生足够大的信号，从而作为精确的跟踪传感器。
The ATLAS group has evaluated the charge collection in silicon microstrip sensors irradiated up to a fluence of 1×1016 n eq /cm 2 , exceeding the maximum of 1.6×1015 n eq /cm 2 expected for the strip tracker during the high luminosity LHC (HL-LHC) period including a safety factor of 2. The ATLAS12, n + -on-p type sensor, which is fabricated by Hamamatsu Photonics (HPK) on float zone (FZ) substrates, is the latest barrel sensor prototype. The charge collection from the irradiated 1×1 cm 2 barrel test sensors has been evaluated systematically using penetrating β-rays and an Alibava readout system. The data obtained at different measurement sites are compared with each other and with the results obtained from the previous ATLAS07 design. The results are very consistent, in particular, when the deposit charge is normalized by the sensor's active thickness derived from the edge transient current technique (edge-TCT) measurements. The measurements obtained using β-rays are verified to be consistent with the measurements using an electron beam. The edge-TCT is also effective for evaluating the field profiles across the depth. The differences between the irradiated ATLAS07 and ATLAS12 samples have been examined along with the differences among the samples irradiated with different radiation sources: neutrons, protons, and pions. The studies of the bulk properties of the devices show that the devices can yield a sufficiently large signal for the expected fluence range in the HL-LHC, thereby acting as precision tracking sensors.
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