Research of Radiation Process of Electron with Use of a Pulse Stretcher Ring

脉冲展宽环电子辐射过程研究

• 批准号: 09304042
• 负责人: NODA Akira
• 金额: $ 15.36万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09304042/
• 关键词: Electron Beam; Duty Factor; Slow Beam Extraction; Pulse Stretcher; Third Order Resonance; Control of the Closed Orbit; Electrostatic Septum; Septum Magnet; パラメトリックX放射

Stretcher mode of the electron storage ring, KSR has been designed and equipment needed for the mode have been fabricated. In the stretcher mode, the output beam from the 100 MeV electron linac is injected into the KSR by 3-turn injection and then slowly extracted in about 1 second by the method utilizing the third order resonance together with RF knock out method. With such a scheme, the duty factor of the electron beam is expected to be increased from 2×10ィイD1-5ィエD1to 〜90%.In the first fiscal year 1997, the design of the stretcher mode of KSR is determined fixing the operating point of the KSR. Then the electrostatic septum as the first septum for the slow extraction system was fabricated. Its high-voltage power supply was also purchased.In the second fiscal year 1998, a septum magnet to be used at the down stream of the electrostatic septum was designed and fabricated. Taking the fact that the ultra-high vacuum better than 10ィイD1-9ィエD1 Tore, the septum coil was designed to be located outside the vacuum system.In 1999 as the final fiscal year for the research project, the electrostatic septum and the septum magnet have been installed into the KSR after evaluation of their characteristics. After the baking process, the vacuum pressure has reached required region of 10ィイD1-9ィエD1 Tore. The high voltage up to 70 kV/cm has been applied to the electrostatic septum with the condition without beam bombardment to the septum foil. Through the beam test up to now, the beam life of the stretcher mode was measured to be several tens second, which is long enough for the operation as the stretcher. The RFKO process is also found to be effective to increase the bettor oscillation amplitude. Quantitative measurements of the extraction efficiency and the time structure of the extracted beam are scheduled from now on.

设计了电子储存环KSR的展宽模式，并制作了模式所需的设备。在展宽模式下，100 MeV电子直线加速器的输出束通过3圈注入注入KSR，然后用三阶共振结合射频击穿的方法在约1秒内缓慢引出。在此方案下，电子束的占空比有望从2×10ィイD_1~5ィエD_1提高到~90%。1997年第一个财政年度，确定了KSR的担架模式设计，确定了KSR的工作点。然后制作了静电隔膜作为慢萃取系统的第一隔膜。在1998第二财年，设计并制造了一种用于静电隔膜下游的隔膜磁体。考虑到超高真空度优于10ィイd1-9ィエd1，隔膜线圈被设计在真空系统之外，1999年作为研究项目的最后一个会计年度，在对静电隔膜和隔膜磁体的特性进行评估后，将它们安装到KSR中。烘烤过程后，真空压力已达到所需的10ィイd1-9ィエd1的范围。在无束流轰击隔膜的情况下，对静电隔膜施加了高达70千伏/厘米的高压。到目前为止，通过束流测试，测得担架模式的束流寿命为几十秒，足以满足担架工作的需要。研究还发现，RFKO过程也有效地提高了贝托振荡幅度。从现在开始，将对提取光束的提取效率和时间结构进行定量测量。

项目成果

A.Noda: "Accelerator Complex of Ion and Electron Storage Rings"Nuclear Instrument and Methods in Physics Research. A441. 154-158 (2000)

A.Noda：“离子和电子存储环的加速器复合体”物理研究中的核仪器和方法。

A.Noda et al.: "Slow Extraction System of Stretcher Ring,KSR" Proc.of the 6th European Particle Accelerator Conference,Stockholm,Sweden. 2120-2122 (1998)

A.Noda 等人：“Slow Extraction System of Stretcher Ring，KSR”，第六届欧洲粒子加速器会议，瑞典斯德哥尔摩。

Y.Hayakawa, M.Seto, Y.Maeda, T.Shirai and A.Noda: "Analysis of the Angular Distribution and the Intensity of Parametric X-ray Radiation in a Bragg Case"Journal of the Physical Society of Japan. 67. 1044-1049 (1998)

Y.Hayakawa、M.Seto、Y.Maeda、T.Shirai 和 A.Noda：“布拉格案例中参量 X 射线辐射的角分布和强度分析”日本物理学会杂志。

A.Noda et al.,: "Stretcher Mode of KSR" Proc.of the 11th Symp.on Accelerator Science and Technology,Harima Science Garden City,Hyogo,Japan. 59-61 (1997)

A.Noda 等人，“KSR 的担架模式”第 11 届加速器科学技术研讨会论文集，播磨科学花园城，兵库县，日本。

Y.Hayakawa, M.Seto, Y.Maeda, T.Shirai and A.Noda: "Analysis of the Angular Distribution and Intensity of Parametric X-Ray Radiation in a Bragg Case" Journal of the Physical Society of Japan. 67(in print). (1998)

Y.Hayakawa、M.Seto、Y.Maeda、T.Shirai 和 A.Noda：“布拉格案例中参量 X 射线辐射的角分布和强度分析”日本物理学会杂志。