BEPC横向阻尼时间的测量
Measurement of transverse damping time on BEPC
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摘要: 利用逐束团测量系统在BEPC储存环中跟踪单个束团得到其多圈位置振荡信息，获得BEPC储存环的横向阻尼时间与束流流强、色品、八极子和束流能量的关系，并通过分析得到了BEPC储存环辐射阻尼时间为52 ms。实验结果表明：流强越高、色品越大，阻尼率也就越大；束流流强为4.7 mA时八极子强度的变化对阻尼率没有影响；束流流强为5 mA时，阻尼率随束流能量升高而减小。Abstract: In BEPC, the oscillation information of the beam position of a single bunch in every turn can be tracked by the bunch-by-bunch system, through which the relationships between the transverse damping time and the beam current, chromaticity, octupole current and beam energy were obtained. The radiation damping time acquired in the experiment was 52 ms. The data analysis result of the bunch-by-bunch tracking experiment indicates that the higher the beam current is and the higher the chromaticity is, the higher the damping ratio is, and that the change of the octupole current has little influence on the damping ratio when the beam current is 4.7 mA. The damping ratio decreases with the rising of the beam energy when the beam current is 5 mA.
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Key words:
- bunch-by-bunch system /
- damping time /
- chromaticity /
- position oscillation
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