{"title":"用于KOTO CsI量热计升级的MPPCs前端电子器件","authors":"N. Hara","doi":"10.7566/jpscp.27.012012","DOIUrl":null,"url":null,"abstract":"The aim of the J-PARC KOTO experiment is to search for new physics beyond the standard model (SM) with the rare kaon decay K L ! (cid:25) 0 (cid:23) (cid:22) (cid:23) . The branching ratio of this decay is predicted to be 3 : 0 (cid:2) 10 (cid:0) 11 in the SM. The KOTO detector consists of an electromagnetic calorimeter made of undoped Cesium Iodide (CsI) crystals, and hermetic veto counters. To reach the sensitivity predicted in the SM, we need to suppress the background caused by beam halo neutrons by an additional factor of ten. We installed 4080 Multi Pixel Photon Counters (MPPCs) upstream of the crystals to discriminate neutrons and photons. In the KOTO detector, the MPPCs will be exposed to a dose of 1 : 5 (cid:2) 10 9 n 1MeV = cm 2 . We measured that radiation damage would not affect the operaion of the MPPCs in the experiment. For the updated calorimeter, we developed front-end electronics including MPPC connection, summing ampli(cid:12)er circuit for the signal, and control system.","PeriodicalId":228570,"journal":{"name":"Proceedings of the 5th International Workshop on New Photon-Detectors (PD18)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2019-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":"{\"title\":\"Front-end Electronics for MPPCs for the KOTO CsI Calorimeter Upgrade\",\"authors\":\"N. Hara\",\"doi\":\"10.7566/jpscp.27.012012\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The aim of the J-PARC KOTO experiment is to search for new physics beyond the standard model (SM) with the rare kaon decay K L ! (cid:25) 0 (cid:23) (cid:22) (cid:23) . The branching ratio of this decay is predicted to be 3 : 0 (cid:2) 10 (cid:0) 11 in the SM. The KOTO detector consists of an electromagnetic calorimeter made of undoped Cesium Iodide (CsI) crystals, and hermetic veto counters. To reach the sensitivity predicted in the SM, we need to suppress the background caused by beam halo neutrons by an additional factor of ten. We installed 4080 Multi Pixel Photon Counters (MPPCs) upstream of the crystals to discriminate neutrons and photons. In the KOTO detector, the MPPCs will be exposed to a dose of 1 : 5 (cid:2) 10 9 n 1MeV = cm 2 . We measured that radiation damage would not affect the operaion of the MPPCs in the experiment. For the updated calorimeter, we developed front-end electronics including MPPC connection, summing ampli(cid:12)er circuit for the signal, and control system.\",\"PeriodicalId\":228570,\"journal\":{\"name\":\"Proceedings of the 5th International Workshop on New Photon-Detectors (PD18)\",\"volume\":\"42 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2019-11-13\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"2\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Proceedings of the 5th International Workshop on New Photon-Detectors (PD18)\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.7566/jpscp.27.012012\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings of the 5th International Workshop on New Photon-Detectors (PD18)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.7566/jpscp.27.012012","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 2
摘要
J-PARC KOTO实验的目的是寻找超越标准模型(SM)的新物理，具有罕见的介子衰变kl !(cid:25) 0 (cid:23) (cid:22) (cid:23)。该衰变的分支比在SM中预测为3:0 (cid:2) 10 (cid:0) 11。KOTO探测器由一个由未掺杂的碘化铯(CsI)晶体制成的电磁量热计和密封否决权计数器组成。为了达到SM中预测的灵敏度，我们需要将束晕中子引起的背景抑制10倍。我们在晶体上游安装了4080个多像素光子计数器(MPPCs)来区分中子和光子。在KOTO检测器中，MPPCs将暴露在1:5 (cid:2) 10 9 n 1MeV = cm 2的剂量下。在实验中，我们测量了辐射损伤不会影响MPPCs的工作。对于更新的量热计，我们开发了前端电子元件，包括MPPC连接，信号的求和放大器(cid:12)电路和控制系统。
Front-end Electronics for MPPCs for the KOTO CsI Calorimeter Upgrade
The aim of the J-PARC KOTO experiment is to search for new physics beyond the standard model (SM) with the rare kaon decay K L ! (cid:25) 0 (cid:23) (cid:22) (cid:23) . The branching ratio of this decay is predicted to be 3 : 0 (cid:2) 10 (cid:0) 11 in the SM. The KOTO detector consists of an electromagnetic calorimeter made of undoped Cesium Iodide (CsI) crystals, and hermetic veto counters. To reach the sensitivity predicted in the SM, we need to suppress the background caused by beam halo neutrons by an additional factor of ten. We installed 4080 Multi Pixel Photon Counters (MPPCs) upstream of the crystals to discriminate neutrons and photons. In the KOTO detector, the MPPCs will be exposed to a dose of 1 : 5 (cid:2) 10 9 n 1MeV = cm 2 . We measured that radiation damage would not affect the operaion of the MPPCs in the experiment. For the updated calorimeter, we developed front-end electronics including MPPC connection, summing ampli(cid:12)er circuit for the signal, and control system.
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