Development and vertical tests of a 166.6 MHz proof-of-principle superconducting quarter-wave beta = 1 cavity

Zhang, Pei; Zhang, Xinying; Li, Zhongquan; Dai, Jin; Ge, Lin; Lin, Hang; Ma, Qiang; Huang, Ting-lei; Mi, Zhenghui; Wang, Qunyao; Meng, F.

doi:10.1063/1.5119093

Cited by 20 publications

(8 citation statements)

References 16 publications

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“…Multipacting was examined and later observed in cavity vertical tests. Those barriers were easily processed by rf conditioning and consistent with simulation predictions [7].…”

Section: Introductionmentioning

confidence: 63%

“…In order to use as much as possible the mature technologies for the rf system, the third harmonic frequency has finally been chosen as 499.8 MHz, thus the fundamental was 166.6 MHz. A new development on the 166.6 MHz 𝛽 = 1 srf system has subsequently been conducted including extensive R&D on cavities [7][8][9][10] and ancillaries [11][12][13]. The 166.6-MHz srf cavity will be operated at 4.2 K and provides 1.2 MV of accelerating voltage and 180 kW of beam power.…”

Section: Introductionmentioning

confidence: 99%

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Multipacting suppression of the HOM-damped 166.6-MHz β=1 quarter-wave superconducting cavities at HEPS

Ge¹,

Zhang²,

Zhang³

et al. 2021

J. Inst.

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A higher-order-mode (HOM) damped 166.6-MHz β=1 quarter-wave superconducting cavity has been designed for the High Energy Photon Source project. Dangerous multipacting barriers have to be removed by geometry optimizations in superconducting cavity design while retaining favorable radiofrequency and mechanical properties as well as sufficient HOM damping. Multipacting analysis has been conducted on the cavity by using coupled simulation codes comprising electromagnetic calculations and particle tracking. A circular transition structure between the cavity and the beam pipe was proposed to remove the high-field multipacting band by eliminating the local minimum of the electric field thus preventing the field-induced electrons from being trapped into the potential well. The impacts of the geometric change on the cavities' electromagnetic and mechanical properties as well as HOM damping were examined. The deteriorated impedance of the first monopole HOM can be recovered by a slightly enlarged beam pipe, while the total loss factor has little change. The compact footprint of the cavity module was maintained as required for a limited straight section with a fixed length. Mechanical properties of the cavity were also retained with an improved tuning sensitivity and frequency stability. These constitute a first HOM-damped 166.6 MHz β=1 quarter-wave superconducting cavity with multipacting suppressed.

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“…Multipacting was examined and later observed in cavity vertical tests. Those barriers were easily processed by rf conditioning and consistent with simulation predictions [7].…”

Section: Introductionmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Multipacting suppression of the HOM-damped 166.6-MHz β=1 quarter-wave superconducting cavities at HEPS

Ge¹,

Zhang²,

Zhang³

et al. 2021

J. Inst.

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“…Furthermore, the RF parameters also affect the full-current, equilibrium parameters of the electron beam significantly. In HEPS storage ring, the main RF frequency is 166.6 MHz [22]. The active third harmonic cavities are planned to be used for lengthening the bunches.…”

Section: Introductionmentioning

confidence: 99%

Equilibrium electron beam parameters of the High Energy Photon Source

Meng

Peng

et al. 2023

Radiat Detect Technol Methods

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Purpose The physics design of the High Energy Photon Source (HEPS) was finished after many times of iteration. Hereby, the typical equilibrium electron beam parameters corresponding to the proposed two baseline operation modes in the baseline design of HEPS are presented. Methods To compute the equilibrium parameters of the electron beam, the lattice parameters, RF parameters, and the parameters of the insertion devices (IDs) were determined first. Furthermore, it is more precise to use the full-current electron beam parameters in the estimations of the performance of the synchrotron light. Therefore, not only the single-particle dynamics but also the current-dependent collective effects need to be considered in the computations of the full-current, equilibrium parameters of the electron beam. Both analytic computations and multi-particle tracking simulations were carried out. Results The full-current, equilibrium parameters of the electron beams in the HEPS storage ring are presented in this paper. Moreover, the main beam parameters in the injector (the booster and the LINAC), corresponding to the two baseline operation modes of the storage ring, are also presented. Conclusion The typical electron beam parameters corresponding to the two baseline operation modes are given in detail in this paper.

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“…The RAON accelerator was designed [23], the cavity was tested with liquid nitrogen [24], the quarterwave resonator (QWR) and the half-wave resonator (HWR) were developed [25][26][27][28], and the half-wave resonator (HWR) cryomodule was tested at 2 K [29,30]. The high-beta cavity for the quarter-wave resonator (QWR) was tested [31], and both the electric and magnetic field-dependent surface resistances were studied on a superconducting niobium ac-Disclaimer/Publisher's Note: The statements, opinions, and data contained in all publications are solely those of the individual author(s) and contributor(s) and not of MDPI and/or the editor(s). MDPI and/or the editor(s) disclaim responsibility for any injury to people or property resulting from any ideas, methods, instructions, or products referred to in the content.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Heating Effect for Quarter-Wave Resonator (QWR) Superconducting Cavities

Kim¹,

Jeon²,

Jung³

et al. 2023

Preprint

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The magnetic heating effect for the superconducting quarter-wave resonator (QWR) cavities is investigated, and the Q slopes of the superconducting cavities are measured with an increasing accelerating field. Physical phenomena for zero-temperature limit are introduced. Bardeen–Cooper–Schrieffer (BCS) resistance and Casimir force are calculated for the zero-temperature limit. The vertical test is shown for the performance test of the quarter-wave resonator (QWR) cavities. The parameters for the quarter-wave resonator (QWR) cavity are presented. The Q slopes are measured as a function of an accelerating electric field at 4.2 K. The surface resistance of the superconducting cavity increases with an increasing peak magnetic field. The magnetic defects cause the degradation for the quality factor. From the magnetic degradation, we can find the magnetic moments of the superconducting cavities. All the quarter-wave resonator (QWR) cryomodules are installed in the tunnel, and beam commissioning is performed successfully.

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Development and vertical tests of a 166.6 MHz proof-of-principle superconducting quarter-wave beta = 1 cavity

Cited by 20 publications

References 16 publications

Multipacting suppression of the HOM-damped 166.6-MHz β=1 quarter-wave superconducting cavities at HEPS

Multipacting suppression of the HOM-damped 166.6-MHz β=1 quarter-wave superconducting cavities at HEPS

Equilibrium electron beam parameters of the High Energy Photon Source

Magnetic Heating Effect for Quarter-Wave Resonator (QWR) Superconducting Cavities

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