Radio-frequency system of the high energy photon source

Zhang, Pei; Dai, Jin; Deng, Ziwei; Ge, Lin; Huang, Tong-Ming; Li, Dongbing; Li, Jian; Li, Zhongquan; Lin, Hang; Luo, Yuanli; Ma, Qiang; Meng, F.; Mi, Zhenghui; Wang, Qunyao; Xu, Haisheng; Zhang, Xinying; Zhao, Fei-Li; Zheng, Hongjuan

doi:10.1007/s41605-022-00366-w

Cited by 7 publications

(2 citation statements)

References 35 publications

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“…To lower the potential contamination of the superconducting cavities, HEPS storage ring will be operated firstly with normal conducting cavities during the initial beam commissioning phase for vacuum cleaning. Therefore, three of the booster copper cavities will be installed in the storage ring during the initial commissioning [2]. Figure 5 shows the forward and reflected power required with different coupling factors of the power coupler for both initial and normal operations.…”

Section: Jinst 19 P06031mentioning

confidence: 99%

“…A total power loss of 53 kW must be compensated by the rf system to ensure an electron beam with a maximum current of 13 mA at 6 GeV. Meanwhile, a total rf voltage of 8 MV is required to provide sufficient acceptance for the 6 GeV beam extracted from the storage ring in the high-bunch-charge operation mode where the booster ring is used as an accumulation ring [2].…”

Section: Introductionmentioning

confidence: 99%

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Design modification and high-power tests of the 500 MHz normal-conducting 5-cell cavities for HEPS

Huang,

Zhang,

et al. 2024

J. Inst.

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The booster ring of the High Energy Photon Source is responsible for ramping the beam energy from 500 MeV to 6 GeV. Six 5-cell copper cavities of PETRA-type were chosen to provide a total accelerating voltage of 8 MV. In order to meet the specific requirements of the HEPS booster, several modifications were made to the original cavity design. Six cavities were delivered to IHEP and underwent successful high-power testing in 2022. The cavities were tested up to a maximum rf power of 120 kW c.w., which is within the reliable capability of the power coupler specified by the vendor. Subsequently, power was maintained at the maximum rf power, with an average duration of 100 hours. Finally, to verify performance during actual operation, a ramped run was conducted according to the pre-defined curve at a repetition rate of 1 Hz, with all low-level rf control loops closed. This paper presents details on the design modifications and the high-power tests of the 500 MHz normal-conducting 5-cell cavities for the HEPS booster ring.

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Section: Jinst 19 P06031mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design modification and high-power tests of the 500 MHz normal-conducting 5-cell cavities for HEPS

Huang,

Zhang,

et al. 2024

J. Inst.

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Milestone progress of the HEPS booster commissioning

Peng,

Cao,

Chen

et al. 2024

NUCL SCI TECH

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Development of a 166.6 MHz β = 1 higher-order-mode-damped superconducting cavity

Guo,

Zhang,

Zhang

et al. 2024

Review of Scientific Instruments

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The storage ring of the high energy photon source will be driven by five 166.6 MHz β = 1 quarter-wave superconducting cavities operating at 4 K. A higher-order-mode-damped superconducting cavity was designed with excellent rf and mechanical properties based on the successful development of the proof-of-principle cavity. The mechanical design of the dressed cavity was focused on addressing stress safety throughout the processes, tunability, frequency detuning due to pressure fluctuation, and Lorentz force, among other factors. A new liquid helium vessel was designed along with a comprehensive stiffening scheme to mitigate the surging peak stress on the cavity resulting from the significantly unequal beam pipe size. In the first batch, three cavities were manufactured, and surface preparations were carefully conducted to eliminate defects and etching traces while ensuring cleanliness. The cavity’s Q0 at the design voltage of 1.5 MV reached 3.8 × 109 at 4 K, comfortably surpassing the design goal. Field emission onset was not observed during the entire test up to a peak electric field of 60 MV/m, thanks to the optimized processing procedures. Subsequently, one cavity was welded with the newly designed helium vessel and vertically tested at 2 K, achieving an rf performance comparable to the bare cavities, demonstrating the success of the jacketed cavity. This paper presents the design, fabrication, surface preparation, and cryogenic tests of the first higher-order-mode-damped 166.6 MHz β = 1 superconducting cavity.

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Radio-frequency system of the high energy photon source

Cited by 7 publications

References 35 publications

Design modification and high-power tests of the 500 MHz normal-conducting 5-cell cavities for HEPS

Design modification and high-power tests of the 500 MHz normal-conducting 5-cell cavities for HEPS

Milestone progress of the HEPS booster commissioning

Development of a 166.6 MHz β = 1 higher-order-mode-damped superconducting cavity

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