Calculations of operating schemes for a passive harmonic cavity in HLS-Ⅱ

FAN Hao; WU Cong-Feng; LIU Guang-Chao

doi:10.1088/1674-1137/36/9/018

Chinese Physics C> 2012, Vol. 36> Issue(9) : 895-899 DOI: 10.1088/1674-1137/36/9/018

Calculations of operating schemes for a passive harmonic cavity in HLS-Ⅱ

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Abstract：
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.

References

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Migliorati M, Palumbo L, Zobov M. Nucl. Instrum. Methods Phys. Res. Sect. A, 1995, 354: 215-223[2] Bosch R A, Hsue C S. Part. Accel., 1993, 42: 81[3] Weihreter E et al. IEEE Trans. Nucl. Sci., 1985, 32: 2317-2319[4] Byrd J M, Georgsson M. Phys. Rev. ST Accel. Beams, 2001, 4: 030701[5] Hofmann A, Meyers S. 11th Conf. on High Energy Accelerators, 1980. 610-612[6] Penco Giuseppe, Svandrlik Michele. Phys. Rev. ST Accel. Beams, 2006, 9: 044401[7] LIU Guang-Chao. Preliminary Investigations of Higher Harmonic Cavity's Theory (M.S.Thesis). University of Science and Technology of China. 2010 (in Chinese)

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FAN Hao, WU Cong-Feng and LIU Guang-Chao. Calculations of operating schemes for a passive harmonic cavity in HLS-Ⅱ[J]. Chinese Physics C, 2012, 36(9): 895-899. doi: 10.1088/1674-1137/36/9/018

FAN Hao, WU Cong-Feng and LIU Guang-Chao. Calculations of operating schemes for a passive harmonic cavity in HLS-Ⅱ[J]. Chinese Physics C, 2012, 36(9): 895-899. doi: 10.1088/1674-1137/36/9/018 shu

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Received: 2011-12-16
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Calculations of operating schemes for a passive harmonic cavity in HLS-Ⅱ

Corresponding author: WU Cong-Feng,

Received Date: 2011-12-16
Accepted Date: 1900-01-01
Available Online: 2012-09-05

Abstract: 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.