Experiments on Characteristics and Control of Positron Plasma

正电子等离子体特性及控制实验

• 批准号: 05452382
• 负责人: MOHRI Akihiro
• 金额: $ 4.54万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05452382/
• 关键词: Slow positron; Nonneutral plasma; Waves; Confinement; Cyclotron radiation; LINAC; Pair creation; Frozen gas moderator; 反物質プラズマ; 陽電子消滅; ガス氷薄膜; 剛体回転平衡; 閉込め; 貴ガス氷薄膜

Positron plasmas were successfully formed through experimental research for three years. The following results have been obtained.1.Slow positrons were generated at a time-average production rate of 6x10^<10> [e+/s] by combining a developed "Photon-Positron Converter" and a high current LINAC.2.Positron plasmas were formed by stacking pulsed slow positrons moderated with a cryogenic solid Ar film.3.A new configuration for trapping slow positrons was developed, which consists of a lot of ring electrodes. A stable rigid rotor plasma can be confined in a closed potential cell.4.Cyclotron radiation cooling in a high magnetic field was applied to get a cold positron plasma. Positrons emerging from 22Na of 3.7 MBq were first moderated by cold electrons and stacked in the trap for longer than 10^4s. Thereby, positron plasmas at room temperature in the magnetic field of 7 T were formed.5.Nonlinear mode-conversions among different electrostatic wave modes were found for spheroidal nonneutral plasmas, and also suppression of diocotron oscillations by rf-electric fields was observed.

经过3年的实验研究，成功形成了正电子等离子体。得到了以下结果：1。通过将研制的“光子-正电子转换器”与大电流linac相结合，以6 × 10^<10> [e+/s]的时间平均产率产生了慢正电子。正电子等离子体是用低温固体氩膜将脉冲慢正电子叠加而成的。提出了一种新的捕获慢正电子的结构，它由许多环形电极组成。稳定的刚性转子等离子体可以被限制在封闭的电位池中。利用高磁场下的回旋辐射冷却得到冷正电子等离子体。从3.7 MBq的22Na中产生的正电子首先被冷电子缓和，并在陷阱中堆叠超过10^4s。由此，在室温下7t磁场下形成了正电子等离子体。在球形非中性等离子体中发现了不同静电波模式之间的非线性模式转换，并观察到射频电场对二极管振荡的抑制作用。

项目成果

毛 利 明 博: "Trapping of a Big Nonneutral Electron Plasmoid in a Closed Electrostatic Potential Wall" Proc. 12th Conf. of Phenomena in Ionized Gases. 3. 63-64 (1995)

Akihiro Mori：“封闭静电势壁中大非中性电子等离子体的捕获”，电离气体现象第 12 届会议。

A.Mohri,H.Tanaka,T.Michishita,T.Yuyama,Y.Kawase,K.Takami: "Production of Intense Positron Beams and Their Moderation" Proc.of Oji Int Seminor(Oji,June-July,1994)“Elementary Processes in Dense Plasma"ed.S,Ichimaru and S.Ogata,Addison-Wesley Pub.475-476 (19

A. Mohri、H. Tanaka、T. Michishita、T. Yuyama、Y. Kawase、K. Takami：“强正电子束的产生及其调节”Proc. of Oji Int Seminor（王子国际研讨会，1994 年 6 月至 7 月）“致密等离子体中的基本过程”ed.S,Ichimaru 和 S.Ogata,Addison-Wesley Pub.475-476 (19

毛 利 明 博: "Production of Slow Positrons with a LINAC as a Source of Positron Plasma Formation" ｀Elementary Processes in Dense Plasmas´, (Addison-Wesley Pub. Co.). 477-486 (1994)

Akihiro Mori：“使用直线加速器作为正电子等离子体形成源的慢速正电子的产生”“致密等离子体中的基本过程”（Addison-Wesley Pub. Co.）477-486（1994）。

A.Mohri, et al.: "Production and Stacking of Slow Positron Beams with a Hich Current LINAC" Material Science Forum. 175-178. 967-970 (1995)

A.Mohri 等人：“使用高电流直线加速器生产和堆叠慢速正电子束”材料科学论坛。

毛 利 明 博: "Production and Stacking of Slow Positron Beams with a High Current LINAC" material Sciences Forum. 175-178. 967-970 (1995)

Akihiro Mori：“使用高电流 LINAC 的慢速正电子束的生产和堆叠”材料科学论坛 175-178 (1995)。