Study for Muon Identification and Its Trigger in Experiments at Super High Energy Hadron Collider (SSC)

超高能强子对撞机（SSC）实验中μ子识别及其触发研究

• 批准号: 03044143
• 负责人: MAKI Akihiro
• 金额: $ 1.28万
• 依托单位: National Laboratory for High Energy Physics
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for international Scientific Research
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 无数据
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03044143/
• 关键词: Muon Chamber; Jet Chamber; Muon Trigger; SSC Experiment; EM Shower by Muon; ミュ-粒子による電磁シャワ-

We have started a muon detector development program of a jet-type drift chamber of its high spatial resolution and two track separation capability. This chamber has two layers of the jet chamber with a half cell staggered. Each jet cell is physically separated from other cells and has only 3 sense wires in it. Therefore even in the case a wire is broken, only the particular single cell will become useless and all other cells can remain healthy. For the purpose of simple trigger, all set of three wires are pointing to the interaction point.With the above basic design of the muon system, we have simulated the performances of the system using the computer codes we developed. The trigger is produced by the mean timer between the staggered pair of top and bottom cells with the additional coincidence with the scintillation counter signal. The trigger rates were carefully studied and it was found that an additional chamber which measures second coordinates needed to reduce the cosmic ray trig … More ger rate. Then that is enough in order to keep the total rate low enough for the data acquisition system for the threshold of 10 to 20 GeV. This trigger logic can not only realize the reasonable rate but also give us position information of the track within the cell with better than 1mm resolution which would be useful for later use in the higher level trigger.Next we have carried a test experiment at the high energy muon beam at Fermilab, Illinois. The test chambers were build by the US collaborators and very similar with our jet chamber. The Japanese group participated the test experiment and analyzed the data. As the result, we found that high energy muons were often accompanied by the EM shower debris, 17% to 30% for the muon energies ranging from 50 GeV to 550 GeV. These data are very precious and were used to tune our simulation program. This enabled us to study the problem under different conditions from those under which we carried in the test experiment.We fabricated a pair of small jet chambers and a large (8m X 3m) chamber to confirm the basic performances and to mainly study mechanical problems for the production of full size chambers, respectively. It was found that the small chambers worked as they were designed, but also found that there are some minor problems in the material and support mechanism of the cathode plates. Right now the large chamber is being modified to solve the problems. key word Detection of Muon Less

启动了具有高空间分辨率和双轨分离能力的射流型漂移室的介子探测器研制计划。这个腔室有两层喷射腔，其中半腔错开。每个喷射细胞与其他细胞在物理上是分开的，并且只有3根感测线在里面。因此，即使在一根电线断裂的情况下，只有特定的单个细胞会变得无用，所有其他细胞都可以保持健康。出于简单触发的目的，所有三根导线都指向交互点。基于以上的介子系统的基本设计，我们利用自己开发的计算机代码对系统的性能进行了仿真。触发器由顶部和底部错开的一对细胞之间的平均计时器产生，并与闪烁计数器信号额外重合。我们仔细研究了触发率，发现需要一个额外的室来测量第二坐标，以减少宇宙射线的触发率。然后，这就足以保持数据采集系统的总速率足够低，达到10到20 GeV的阈值。这种触发逻辑不仅可以实现合理的速率，而且还可以提供单元内轨道的位置信息，分辨率优于1mm，这将有助于以后在更高级别触发中使用。接下来，我们在伊利诺斯州费米实验室进行了高能介子束的测试实验。测试室是由美国合作者建造的，与我们的喷气室非常相似。日本组参与了测试实验并分析了数据。结果，我们发现高能μ子经常伴随着EM阵雨碎片，其中17% ~ 30%的μ子能量在50 ~ 550 GeV之间。这些数据是非常宝贵的，并用于调整我们的模拟程序。这使我们能够在不同的条件下研究问题，而不是在我们进行测试实验的条件下。我们分别制作了一对小射流室和一个大射流室（8m X 3m），以确定其基本性能，并主要研究生产全尺寸射流室的机械问题。研究发现，小腔室的工作原理与设计一致，但也发现阴极板的材料和支撑机构存在一些小问题。现在正在对大舱室进行改造以解决这些问题。关键词：μ子探测

项目成果

S. Odaka: "A Jet-cell Design for the SDC Muon Chamber" KEK Preprint 91-96. 1-12 (1991)

S. Odaka：“SDC Muon 室的喷射电池设计”KEK 预印本 91-96。

Y. Arai: "Conceptual Design Report for the SDC Barrel and Intermediate Muon Detectors Based on a Jet-type Drift Chamber" SDC-92-169. 1-239 (1992)

Y. Arai：“基于喷射型漂移室的 SDC 桶形和中间 μ 介子探测器的概念设计报告”SDC-92-169。

Y.Arai: "Conceptual Design Report for the SDC Barrel and Intermediate Muon Detectors Based on a Jet-type Drift ehamber" SDC-92-169. 1-239 (1992)

Y.Arai：“基于喷射型漂移室的 SDC 筒和中间 μ 介子探测器的概念设计报告”SDC-92-169。

S.Odaka: "A Jet-cell Design for the SDC Muon Chamber" KEK Preprint 91-96. 1-12 (1991)

S.Odaka：“SDC Muon 室的喷射电池设计”KEK 预印本 91-96。