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Development of the Hadron Absorber for the 2nd Phase Operation of the T2K Neutrino Oscillation Experiment

T2K中微子振荡实验第二阶段运行强子吸收器的研制

基本信息

批准号：
18340077
负责人：
ISHIDA Taku
金额：
$ 10.91万
依托单位：
High Energy Accelerator Research Organization
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18340077/
关键词：
Experimental Particle Physics Accelerator radiation, X-ray, particle beam Neutrino T2K

项目摘要

To carry out T2K, a next-generation long base-line neutrino oscillation experiment connecting 295 km from Tokai to Kamioka, is one of the main motivations to construct J-PARC. It employs a 50GeV proton synchrotron as a neutrino super-beam source, and Super-Kamiokande as a far neutrino detector. It can explore mass and mixing of neutrinos with unprecedented precision. It especially aims to observe tiny vμ-to-v_e appearance signal for the first time. A neutrino beam-line is under construction at the Tokai campus, and beam commissioning is scheduled in April, 2009. The purpose Of the project is to develop a hadron absorber system which can accept 1MW beam loss. It is vitally important for the future project of T2K to focus on the discovery of the CP violation in the lepton sector. The beam dump is located at the downstream of the decay volume, where a hadron absorber, the core of the beam dump, is installed together with iron shields. The design of the hadron absorber is as follows : It is composed of 14 core modules and a frame supporting them. It has a size of 3.1m x 5.4m x 3.2m, and total weight of 70t. A core module is composed of 7 large extruded graphite blocks, fastened to an aluminum cast plate with cooling water paths in it. To keep flatness of 0.1mm for the cooling surface and for the loading surface, 7 graphite blocks are machined together at once. A design with multiple spring washers is adopted to fasten graphite and aluminum, to minimize the reduction of joint force, i.e. heat convection between them, by temperature rise at beam operation. Following to the detailed design, we have produced the 1st core module successfully.

实施从东海到神冈295公里的下一代长基线中微子振荡实验T2 K是建设J-PARC的主要动机之一。它采用50 GeV质子同步加速器作为中微子超束源，Super-Kamiokande作为远中微子探测器。它可以以前所未有的精度探索中微子的质量和混合。特别是首次观测到微小的vμ-to-v_e出现信号。一条中微子束线正在东海校区建设中，束线将于2009年4月投入使用。本项目的目的是研制一个能接受1 MW束流损失的强子吸收器系统。因此，T2 K计划的重点是发现轻子区的CP破坏。束流收集器位于衰变体积的下游，其中强子吸收器，束流收集器的核心，与铁屏蔽一起安装。强子吸收器的设计如下：它由14个核心模块和支撑它们的框架组成。它的尺寸为3.1m x 5.4m x 3.2m，总重量为70吨。核心模块由7块大的挤压石墨块组成，固定在一个带有冷却水通道的铸铝板上。为了保持冷却表面和加载表面的0.1mm平整度，7块石墨块一次加工在一起。采用多弹簧垫圈的设计来紧固石墨和铝，以最大限度地减少梁操作时温度升高引起的接合力的减小，即它们之间的热对流。在详细设计之后，我们成功地制作了第一个核心模块。