Development of a crystal installing SQUID's for the detection of charged particles

开发安装 SQUID 的晶体，用于检测带电粒子

• 批准号: 02804011
• 负责人: FUJITA Yoshitaka
• 金额: $ 1.73万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02804011/
• 关键词: cryostat; SQUID; Detection of a Charged Particle Without Touching

A weak magnetic field follows a moving charged particle and the strength of the field increases with the velocity of the particle. Accoridng to our calculation using the theory of special relativity, it is predicted that the strength of the magnetic field induced by a charged prticle moving with a relativistic speed have an order of magnitude detectable by a SQUID. This fact opens a possibility of detecting a charged particle without directly "touching". As a first step we develop a crystal for the installation of the SQUID which should be operated at the helium temperature. The crystal is characterized with a hole through which charged particles can come and go.Thinking of the future development, we decided to use FRP material instead of metal such as stainless steel. The type of the FRP was examined in order to survive the low temperature and to achieve good magnetic character. For the liquid and the vacuum seal, a screw system has been tested and developed, which makes the assembling and the deassembling easy. In a preliminary test we succeeded in sealing the liquid nitrogen and also the liquid helium. The prototype crystal could keep the liquid nitrogen for a while, but it was not possible to reach the stage of keeping the liquid helium. The cause of the leakage was detected and we hope we can keep them after the improvement progressing now.

一个弱磁场跟随着一个移动的带电粒子，磁场的强度随着粒子的速度而增加。根据狭义相对论的计算，预言了以相对论速度运动的带电粒子所感应的磁场强度具有SQUID可探测到的量级。这一事实开启了在不直接“接触”的情况下检测带电粒子的可能性。作为第一步，我们开发了一个晶体的安装SQUID应在氦气温度下运行。晶体的特点是有一个孔，带电粒子可以通过这个孔进出。考虑到未来的发展，我们决定使用FRP材料代替不锈钢等金属。为了在低温下生存并实现良好的磁特性，对FRP的类型进行了检查。对于液体密封和真空密封，试验并研制了一种螺旋系统，使其装拆方便。在初步测试中，我们成功地密封了液氮和液氦。原型晶体可以保持液氮一段时间，但不可能达到保持液氦的阶段。泄漏的原因已经被发现，我们希望在改进后可以保留它们。

项目成果

Y.Ohtani,S.Nishijima,T.Okada et al.: "Consideration of Thermal Insulating Support System" Adv.Cryog.Eng.38. (1992)

Y.Ohtani、S.Nishijima、T.Okada 等人：“隔热支撑系统的考虑”Adv.Cryog.Eng.38。

S.Ueno,S.Nishijima,T.Okada et al.: ""Glass-Film-Glass"Hybrid Organic Composites for Forced Flow Fusion Magent" Adv.Cryog.Eng.38. (1992)

S.Ueno、S.Nishijima、T.Okada 等人：“用于强制流动熔合剂的“玻璃-薄膜-玻璃”杂化有机复合材料”Adv.Cryog.Eng.38。

Y.Fujita et al.: "Planned TimeーofーFlight Mass Measurements for Exotic Nuclei Using the ESR at GSI" Proc.Int.Symp.on “Structure and Reactions of Unstable Nuclei",Niigata,Japan,June 17ー19 (1991) World Scientific Publishing. (1992)

Y.Fujita 等人：“使用 GSI 的 ESR 进行奇异核的计划飞行时间质量测量”Proc.Int.Symp.on“不稳定核的结构和反应”，日本新泻，6 月 17-19 日（ （1991）世界科学出版社（1992）。

J. Trotscher, Y. Fujita et al.: "Isochronous, Multi-turn Mass Measurement of Exotic Nuclei Using the ESR" Proc. Second Int. Conf. on Radioactive Nuclear Beams, Louvain-la-Neuve, Belgium. 1991 IOP Publishing. 401-406 (1992)

J. Trotscher、Y. Fujita 等人：“使用 ESR 对奇异核进行等时、多转质量测量”Proc。

J.Trotscher,Y.Fujita et al.: "Isochronous,Multiーturn Mass Measurement of Exotic Nuclei Using the ESR" Proc.Second Int.Conf.on Radioactive Nuclear Beams,LouvainーlaーNeuve,Belgium,August 19ー21 (1991),IOP Publishing. 401-406 (1992)

J.Trotscher、Y.Fujita 等人：“使用 ESR 对奇异核进行等时多圈质量测量”Proc.Second Int.Conf.on Radioactive Nuclear Beams，Louvain-la-Neuve，比利时，8 月 19-21 日（1991 年） ），IOP 出版 401-406（1992）。