OBSERVATION OF HIGH ENERGY COSMIC-RAY WITH SUPERCONDUCTING SPECTROMETER

在KEK、东京大学、ISAS、神户大学和新墨西哥州立大学的合作下，计划在加拿大北部的林恩湖进行超导螺线管磁谱仪的气球实验，以研究宇宙射线和天体粒子物理。主要目的是在宇宙射线中寻找原始反物质的证据，研究宇宙早期历史中发生的物质/反物质不对称现象。圆柱形光谱仪配置薄超导磁体优化，为这些科学目标提供0.5 - 1.0 m2sr的大几何接受度。该联合研究项目自1990年第四季以来一直在进行。为了寻找最佳的气球位置，于1990年对加拿大进行了第一次初步活动，确定了加拿大曼尼托巴省林恩湖的气球位置，因为该地区地理条件最佳，非常靠近磁北极（垂直磁场较大，磁场分量较多），而且非常空旷。在1991年进行了第二次运动，并进行了初步实验以验证可能的大气球发射。1992年夏天计划进行一次科学气球实验，并在林恩湖为气球实验做准备。不幸的是，由于外交协议未能在预定发射前的适当时间内达成，气球在1992年未能实现。然而，气球的准备工作已经完成，发射的技术彩排已经完成，宇宙射线事件也在地面上观测到了。综上所述，本次联合研究项目取得了以下成果：-对热气球地点进行了地质调查，林恩湖被选为最佳热气球地点。-在加拿大林恩湖进行了热气球的准备和初步实验。该实验已经为下一个项目的科学主要飞行做好了准备，该项目已被教育，科学和文化部批准。少

Balloon-borne experiment with a superconducting solenoidal magnet spectrometer has been planned to be carried out at Lynn Lake in north Canada in cooperation amongst KEK, University of Tokyo, ISAS, Kobe University and New Mexico State University to investigate cosmic-ray and astro-particle physics. The primary objective is to search for evidence of primordial antimatter in cosmic-rays to study assymmetry of matter/antimatter happened in early history of Universe. The cylindrical spectrometer configuration with a thin superconducting magnet is optimized to provide a large geometrical acceptance of 0.5 - 1.0 m2sr for these scientific objectives.The joint research project has been carried out since JFY 1990. The first preliminary campaign to Canada was carried out in 1990 to survey for optimum ballooning place, and the location of Lynn lake, Manitoba, Canada, was fixed for the ballooning because of the best geological condition very close to magnetic north pole (larger vertical magnetic f … More ield component) and of very empty place. The second campaign was carried out in 1991 and preliminary experiment was carried out to verify a possible large balloon launching. A scientific ballooning was planned in summer of 1992, and the experiment was prepared at Lynn lake for ballooning. Unofortunately, the ballooning was not realized in 1992, because a diplomatic agreement could not in plance within an appropriate time before the scheduled launching. However, the ballooning preparation has been completed and a technical rehearsal for launching was performed and cosmic ray events were observed on ground.As a summary, the following results have been obtained in this joint research project.- Geological survey for ballooning place was made and Lynn Lake was chosen as the best place for ballooning.- Preparation and preliminary experiment for ballooning have been experienced at Lynn Lake, Canada.The experiment has become ready for scientific main flight to be carried out in the next project which has been approved by Ministry of Education, Science and Culture. Less