An RF Acceleration Test for a Pulse Stretcher Ring. (1992)

脉冲展宽器环的射频加速测试。

• 批准号: 02554002
• 负责人: SUGAWARA Masumi
• 金额: $ 9.73万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02554002/
• 关键词: Pulse Stretcher; RF Acceleration; Continuous Electron Beam; Beam Loading; パルスビ-ムストレッチャ; ビ-ム負荷; RF加速空洞

An RF accelerating system for SSTR, the 150 Mev pulse stretcher ring at Tohoku University has been prepared and tested. An electron beam current of around 10 mA was stored for 3 seconds. The beam life was mainly limited due to a vacuum pressure of about 1x10^<-6> Torr at this time. An RF frequency of this accelerating system is 2856 MHz and is phase-locked to the master oscillator of the linear accelerator. A single-cell standing wave accelerating structure, which has a beam aperture diameter of 70 mm and four ports for RF couplers and resonant frequency tuners, has been completed. A shunt impedance of the structure was designed to be low and measured to be 0.26 megohms. An RF input coupler with coupling constant of 27.5 was designed and fabricated. These low impedance and high coupling constant have been optimized for a heavy beam loading change of 0 to 100 mA, which is repeated at 300 Hz. These RF parameters enable to suppress changes of accelerating voltage and phase within 1 % and 17 degrees, respectively, even if an input power of 250 watts is kept constant. No change in accelerating voltage and phase was observed when the beam current was changed from 0 to 10 mA within 100 nsec. The beam extraction from the ring is being planned for the next experiment.

一个用于SSTR的射频加速系统，东北大学的150 Mev脉冲拉伸环已经准备好并进行了测试。大约10毫安的电子束电流被储存了3秒。由于此时的真空压力约为1 × 10^<-6> Torr，限制了光束寿命。该加速系统的射频频率为2856 MHz，锁相于直线加速器的主振荡器。完成了一种单单元驻波加速结构，该结构的波束孔径为70 mm，有四个端口用于射频耦合器和谐振频率调谐器。该结构的分流阻抗设计得很低，测量值为0.26兆欧。设计并制作了一个耦合常数为27.5的射频输入耦合器。这些低阻抗和高耦合常数已经优化，适用于0到100 mA的大波束负载变化，在300 Hz下重复。即使在250瓦的输入功率保持不变的情况下，这些射频参数也能将加速电压和相位的变化分别抑制在1%和17度以内。当束流在100 nsec内从0 ~ 10 mA变化时，加速电压和相位没有变化。从环中提取光束的计划将用于下一个实验。

项目成果

R.Kato et al: "Feasibility study of an RF system for SSTR, the 150 MeV pulse stretcher." Proc. of the 15th Linear Accelerator Meeting in Japan Sapporo, Japan. 56-58 (1990)

R.Kato 等人：“SSTR（150 MeV 脉冲展宽器）射频系统的可行性研究。”

T. Eguchi et al: "Beam Extraction from the Stretcher-Booster Ring." Research Report of Lad. of Nuclear Science, Tohoku Univ.25. 93-104 (1992)

T. Eguchi 等人：“从担架助推器环中提取光束。”

T.Tamae et al: "Stretcher-booster ring of the proposed facility in Tohoku University." Proc. of the 8th Symposium on Accelerator Science and Technology, Saitama, Japan. 462-464 (1991)

T.Tamae 等人：“东北大学拟议设施的担架助推环。”

加藤 龍好: "パルスビ-ムストレッチャRF系の研究" 核理研研究報告. 23. 121-130 (1990)

加藤达义：“脉冲束展宽器射频系统的研究” RIKEN 研究报告 23. 121-130 (1990)。

R.Kato et al: "Feasibility Study of an RF System for SSTR - the 150 MeV Pluse Stretcher -" Proc. of the 15th Linear Acceleraor Meeting in Japan, Sapporo. 56-58 (1990)

R.Kato 等人：“SSTR 射频系统的可行性研究 - 150 MeV Pluse Stretcher -”Proc。