Abstract
This paper studies the radiation hardness of low gain avalanche detector (LGAD) developed by the Novel Device Laboratory (NDL) in Beijing and the Institute of High Energy Physics (IHEP) of Chinese Academy of Sciences, in the context of an upgrade project of the ATLAS detector for the high luminosity phase of LHC. NDL LGAD sensors with different layouts, epitaxial resistivity and doping profile were irradiated up to 1.02 × 1015 neq/cm2 by 70 MeV protons at Cyclotron and Radioisotope Center (CYRIC). The timing resolution of NDL LGAD sensors reached 50 ps and the collected charge reached 3 - 4 fC after irradiation.
Highlights
This paper studied the radiation hardness of low gain avalanche detector (LGAD) developed by the Novel Device Laboratory (NDL) in Beijing and the Institute of High Energy Physics (IHEP) of Chinese Academy of Sciences, in the context of an upgrade project of the ATLAS detector for the high luminosity phase of LHC
This paper studied the timing resolution and charge collection of NDL Low gain avalanche detector (LGAD) after proton irradiation up to 1.02 ⇥1015 neq/cm2 at Cyclotron and Radioisotope Center (CYRIC) in Japan
In the prototype run, IHEP and NDL will increase the doping concentration of the gain layer to improve the performance of charge collection after irradiation
Summary
Thin LGAD has high signal-to-noise ratio and short signal rise time. It has a very good timing resolution. In HGTD project, LGAD is required to reach 70 picoseconds (ps) timing resolution after an irradiation up to f 2.5 ⇥1015 neq/cm. Have been performed for the HPK and CNM LGAD sensors [5, 6, 9, 10, 11], but the properties of NDL LGADs haven’t been studied after proton irradiation. This paper studied the timing resolution and charge collection of NDL LGAD after proton irradiation up to 1.02 ⇥1015 neq/cm at Cyclotron and Radioisotope Center (CYRIC) in Japan
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