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Nonlinear optimization for longitudinal beam injection in diffraction-limited synchrotron light sources

Shen Siqi Tian Shunqiang Zhang Qinglei Wu Xu Zhao Zhentang

沈思淇, 田顺强, 张庆磊, 等. 衍射极限环光源纵向束流注入非线性优化[J]. 强激光与粒子束, 2019, 31: 125101. doi: 10.11884/HPLPB201931.190196
引用本文: 沈思淇, 田顺强, 张庆磊, 等. 衍射极限环光源纵向束流注入非线性优化[J]. 强激光与粒子束, 2019, 31: 125101. doi: 10.11884/HPLPB201931.190196
Shen Siqi, Tian Shunqiang, Zhang Qinglei, et al. Nonlinear optimization for longitudinal beam injection in diffraction-limited synchrotron light sources[J]. High Power Laser and Particle Beams, 2019, 31: 125101. doi: 10.11884/HPLPB201931.190196
Citation: Shen Siqi, Tian Shunqiang, Zhang Qinglei, et al. Nonlinear optimization for longitudinal beam injection in diffraction-limited synchrotron light sources[J]. High Power Laser and Particle Beams, 2019, 31: 125101. doi: 10.11884/HPLPB201931.190196

衍射极限环光源纵向束流注入非线性优化

doi: 10.11884/HPLPB201931.190196
详细信息
  • 中图分类号: TL501

Nonlinear optimization for longitudinal beam injection in diffraction-limited synchrotron light sources

More Information
    Author Bio:

    Shen Siqi (1991—), male, PhD student, majors in accelerator physics; shensiqi@sinap.ac.cn

  • 摘要:

    下一代同步辐射光源储存环动力学孔径较小,因而束流注入困难,可以通过纵向束流注入解决这一问题。为了使用更长的kicker脉冲,有必要降低高频频率以增加注入束流到储存束流的时移。因为同步辐射运动,时移更长的束流有更高的动量偏差,所以通过该方法进行注入需要储存环提供足够大的能量接受度和动力学孔径。用SSRF-U的候选磁聚焦结构来展示纵向束流注入非线性优化的可行方法。由一系列高频频率的最佳结果可知,低于界限频率时kicker脉冲不会继续增长。在束流模拟中,采用界限频率与合适六级铁强度,可使SSRF-U储存环束流注入达到最高效率。

  • Figure  1.  Longitudinal beam injection shown in the synchrotron phase space

    Figure  2.  The beam optics in one fold of the SSRF-U storage ring

    Figure  3.  The available energy acceptance as a function of the amplitude of the tune variation with momentum

    Figure  4.  The maximum distance of the fully injected beam to the stored beam as a function of the RF frequency

    Figure  5.  Fractional tunes as functions of momentum deviation (top) and on- and off-momentum DAs (bottom)

    Figure  6.  Injection efficiency as a function of the center position of the injected beam in the synchrotron phase space (shown as contour maps)

    Table  1.   The lattice parameters of the SSRF-U storage ring

    lattice 20×7BA
    beam energy/GeV 3.0
    circumference/m 432
    tune (H, V, S) 61.22, 15.32, 0.001 64
    natural chromaticity (H, V) −129.2, −81.04
    corrected chromaticity (H, V) 2.0, 2.0
    momentum compaction factor 0.000 1
    damping partition number (H, V, S) 1.374, 1.000, 1.626
    damping time (H, V, S)/ms 12.29, 16.89, 10.39
    energy loss per turn/keV 512.0
    natural energy spread 7.616×10−4
    natural emittance/(pm·rad) 97.00
    RF voltage/MV 1.50
    下载: 导出CSV
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出版历程
  • 收稿日期:  2019-06-03
  • 修回日期:  2019-09-07
  • 刊出日期:  2019-12-01

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