Study of a neutrino beam monitor for the Long Baseline Neutrino Oscillation Expcriment

长基线中微子振荡实验中微子束监测仪的研究

• 批准号: 08454066
• 负责人: TAMURA Norio
• 金额: $ 4.93万
• 依托单位: Niigata University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08454066/
• 关键词: Neutrino Oscillation; Long Baseline Neutrion Oscillation Experiment; Scintillating Fiber; Lead Glass; Image Intensifier Tube; シンチレーションファイバー; チェレンコフ光

The beam monitor consists of a muon detector, a lead glass calorimeter system, a veto/trigger counter system and a water/scintillating fiber system. This grand-inaide was used for the following two parts.1) Lead glass calorimeter : The study of the lead glass calorimeter was done roughly in two steps. The first step was a beam test using an electron beam. By the beam test, some sample counters were absolutely calibrated relatively to the beam electron energy. In addition, much knowledge about clustering etc. was obtained. Then, as the second step, all counters were calibrated by using cosmic ray particles again. As the relation between pules height by electrons and cosmic ray particles is known in the above described two steps, all lead glass counters were well calibrated.2) Water/Scintillating fiber system : The first step of the study of this part was the selection of fibers to be used in this detector. As the result, 0.7mmphi fiber with multi-cladding. By a lot of efforts, the production scheme of fiber sheet was established. Final mass production is now underway. A small size prototype fiber detector was made and tested by a cosmic ray. It showed that a reasonably good position resolution and efficiency can be obtained.By the present study, we established the way to make a detector which can meet the requirement from the neutrino oscillation experiment. For the final check, a prototype of the neutrino beam monitor including all components was constructed and test at KEK PS.The data are now being analyzed.

束流监测器由一个介子探测器、一个铅玻璃量热计系统、一个否决/触发计数器系统和一个水/闪烁光纤系统组成。铅玻璃量热计的研究大致分两步完成。第一步是使用电子束进行束流测试。通过束流测试，对一些样品计数器进行了相对于束流电子能量的绝对校准。此外，还获得了大量关于聚类等方面的知识。然后，作为第二步，所有计数器再次使用宇宙线粒子进行校准。由于在上述两个步骤中已知电子脉冲高度和宇宙射线粒子之间的关系，所以所有铅玻璃计数器都被很好地校准。2)水/闪烁纤维系统：这部分研究的第一步是选择用于该探测器的光纤。结果表明，0.7Mmphi多包层光纤。经过大量的努力，确定了纤维板的生产方案。最后的批量生产现在正在进行中。制作了一个小尺寸的光纤探测器样机，并用宇宙线进行了测试。通过本研究，我们建立了一种能够满足中微子振荡实验要求的探测器。作为最后的检查，包括所有部件的中微子束监测器的原型已经建造完成，并在KEK PS上进行了测试。数据现在正在分析中。