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Experimental Study of Elementary Particle Physics by the Electron-Proton Collider HERA

电子-质子对撞机 HERA 的基本粒子物理实验研究

基本信息

批准号：
63044033
负责人：
YAMADA Sakue
金额：
$ 14.72万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1990
项目状态：
已结题

项目摘要

The purpose of this research program is to study elementary particle physics by means of electron-proton collisions at HERA, the first e-p collider ever built. The center of mass energy of the collider is 314 GeV, which enables to open such new fields to investigate the proton structure functions at very large Q^2 and/or very small x regions or to clarify the detailed properties of electro-weak interactions at very short distances. These studies require among others a high quality sophisticated detector system which can detect different types of secondary particles in a hermetic way. This program concentrated for the last three years to build an universal detector ZEUS to fulfill the requirement. Activities included ;1) Construction of a high quality hadron calorimeter system, 2) R&D of an electron-hadron separator using a Si-diode array, 3) Development and construction of a global first level trigger (GFLT) system and 4) Establishment of simulation software and studies of trigger cond … More itions using simulated events.Some details and achievements are described for each item.1) CalorimeterBasic R&D works were finished before this program. In this program efforts are made to construct calorimeters. By now all forward and rear calorimeters have been completed, tested and installed into the experimental hall. Photomultipliers were tested with a computer controlled test system and a new scheme was developed to supply high voltage to them.2) Hadron-Electron SeparatorAll the basic studies have been completed for the detector, mechanics and electronics. Tests were made with a small detector sample inserted in the prototype calorimeter.3) GFLTIn order to cope with the high rate of collisions (10MHz), a pipe-lined design was employed so that a long enough computation time (5 musec) is available for trigger decisions. The system has been constructed and the tests of communication with the detector components are progressing. The test made so far with some components proved to be successful.4) SimulationsElaborated software are being prepared to simulate physics reactions and detector responses. They were installed into the computer system of INS, where a substantial cpu time is available. Both deep inelastic scattering events (neutral current and charged current) and background events were produced in collaboration with other institutions. They were used to study trigger conditions to eliminate the beam-gas background effectively.All activities were carried out in a close collaboration with the foreign collaborators. Since much work were made at home, discussions and combined efforts at the experimental cite were essential in order to unify the accomplishments made at different institutions. Less

该研究计划的目的是通过HERA的电子-质子碰撞来研究基本粒子物理学，HERA是有史以来建造的第一台电子-质子对撞机。对撞机的质心能量为314 GeV，这使得能够打开这样的新领域，以研究在非常大的Q^2和/或非常小的x区域的质子结构函数，或者澄清在非常短的距离上的电弱相互作用的详细性质。这些研究除其他外需要高质量的精密探测器系统，该系统可以以密封的方式探测不同类型的次级粒子。该计划集中在过去三年中建立一个通用探测器ZEUS，以满足要求。活动包括; 1）高质量强子量能器系统的建立; 2）硅二极管阵列电子-强子分离器的研制; 3）全球第一级触发器（GFLT）系统的研制; 4）模拟软件的建立和触发条件的研究。 ...更多信息本项目采用模拟事件的方法，对每一个项目的细节和成果进行了描述。在这个计划中，努力建造热量计。到目前为止，所有的前、后热量计已经完成，测试和安装到实验大厅。用计算机控制的测试系统对光电倍增管进行了测试，并提出了一种新的高压供电方案。2）强子-电子分离器完成了探测器、机械和电子学的全部基础研究。3）GFLT为了科普高碰撞率（10 MHz），采用了管道式设计，以便有足够长的计算时间（5 μ sec）用于触发决策。该系统已经建成，与探测器组件的通信测试正在进行中。迄今为止，对某些部件进行的测试被证明是成功的。4）模拟正在编制精心制作的软件，以模拟物理反应和探测器响应。它们被安装到INS的计算机系统中，那里有大量的CPU时间。深度非弹性散射事件（中性电流和带电电流）和背景事件都是与其他机构合作产生的。这些工作都是在与国外合作者密切合作下完成的。由于许多工作是在国内进行的，为了统一不同机构取得的成就，在实验地点进行讨论和共同努力是必不可少的。少