A passive higher harmonic cavity （HHC） will be used in the Hefei Light Source II Project （HLS- II） to lengthen the bunch and consequently increase the beam lifetime dominated by Touschek scattering. The effects of...A passive higher harmonic cavity （HHC） will be used in the Hefei Light Source II Project （HLS- II） to lengthen the bunch and consequently increase the beam lifetime dominated by Touschek scattering. The effects of constant voltage and constant detuning have been calculated and compared over the operating current from 0.4 to 0.2 A on the bunch lengthening for the passive normal conducting harmonic cavity system in HLS-II. The results show that the bunch shape has less change and the lifetime improvement factors are not less than 2.7 over the beam currents for the constant voltage case. The constant voltage operating scheme may be applied to our machine.展开更多
基金Supported by National Natural Science Foundation of China (10675116)Major State Basic Research Development Programme of China (2011CB808301)
文摘A passive higher harmonic cavity （HHC） will be used in the Hefei Light Source II Project （HLS- II） to lengthen the bunch and consequently increase the beam lifetime dominated by Touschek scattering. The effects of constant voltage and constant detuning have been calculated and compared over the operating current from 0.4 to 0.2 A on the bunch lengthening for the passive normal conducting harmonic cavity system in HLS-II. The results show that the bunch shape has less change and the lifetime improvement factors are not less than 2.7 over the beam currents for the constant voltage case. The constant voltage operating scheme may be applied to our machine.
