北京正负电子对撞机二期储存环色品对阻尼时间的影响与分析OA
Chromaticity effects and analysis on damping time in the Beijing electron-positron collider Ⅱ storage ring
为深入分析束流色品对北京正负电子对撞机二期(Beijing electron-positron collider Ⅱ,BEPC Ⅱ)总阻尼时间的影响,在小束流条件下对BEPC Ⅱ不同模式的校正色品值进行了测量,并在不同色品模式下,探讨了正、负电子环阻尼时间随束流强度的变化,以及正、负电子储存环横向反馈系统对阻尼时间的影响.结果显示:负电子环色品从0.1增加到1.5可以把头尾阻尼时间从46.4 ms降低到16.2 ms;使总阻尼时间从11.5 ms降低到7.4 ms,减小了约35.7％;正电子环色品从0.9增加到2.7,成功把头尾阻尼时间从43.8 ms降低到12.7 ms,对应总阻尼时间从12.9 ms降低到7.6 ms,减小约41.1％.结果可为对撞模式运行调束提供参考.
To conduct a quantitative analysis of impact of beam chromaticity on total damping time of Beijing electron-positron collider Ⅱ(BEPC Ⅱ),measurements of corrected chromaticity were taken in lattices with different chromaticities of BEPC Ⅱ at low beam current.Additionally,the damping times of positron and electron rings were measured as a function of beam current in different lattices.The effect of transverse feedback system on damping times of both electron-positron rings was measured.The head-tail damping time was found to be reduced from 46.4 ms to 16.2 ms and 43.8 ms to 12.7 ms,leading to a reduction of total damping time from 11.5 ms to 7.4 ms(reduced about 35.7％)and 12.9 ms to 7.6 ms(reduced about 41.1％),when chromaticity increased from 0.1 to 1.5 and 0.9 to 2.7 in the electron-positron rings,respectively.These experimental data provide a reference for machine optimization in collision mode operations.
耿会平;王娜;邢军;张耀锋
中国科学院高能物理研究所,北京中国科学院高能物理研究所,北京中国科学院高能物理研究所,北京北京师范大学物理与天文学院,北京
能源科技
电子储存环同步辐射阻尼头尾阻尼阻尼时间校正色品横向反馈
electron storage ringsynchrotron radiation dampinghead-tail dampingdamping timecorrected chromaticitytransverse feedback
《北京师范大学学报（自然科学版）》 2026 (1)
16-20,5
国家自然科学基金资助项目(12175249)
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