The mechanical design, fabrication and tests of a 166.6 MHz quarter-wave beta=1 proof-of-principle superconducting cavity for HEPS

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

doi:10.1016/j.nima.2019.162770

Cited by 13 publications

(3 citation statements)

References 9 publications

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“…The mechanical properties have been examined for the HOM-damped cavities with both transition geometries. Similar procedures have been followed as described in previous studies [8,22]. Stress distribution, pressure sensitivity, frequency tuning, and Lorentz force detuning have been simulated by using CST Microwave Studio and ANSYS software [23].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…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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Section: Mechanical Propertiesmentioning

confidence: 99%

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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show abstract

“…A 2021 JINST 16 P04011 simplified schematic of the HEPS RF system is shown in figure 1. Before the construction of HEPS, an R&D project namely HEPS -Test Facility (HEPS-TF) was funded between 2016 and 2018 to prototype key hardware technologies [17][18][19][20][21][22][23]. A 166.6-MHz 50-kW SSA was thus developed as the first prototype to maximize learning on high-power SSA technologies in collaboration with a domestic company.…”

Section: Introductionmentioning

confidence: 99%

Design and performance tests of a modular 166.6-MHz 50-kW compact solid-state power amplifier for the HEPS-TF project

Luo¹,

Zhang²,

Lin³

et al. 2021

J. Inst.

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A 166.6-MHz 50-kW power transmitter is required to drive the dressed superconducting radio-frequency (RF) cavity during horizontal tests and to condition the fundamental power couplers as well as higher-order-mode ferrite absorbers. A highly modular yet compact amplifier adopting solid-state technologies was therefore developed in the framework of High Energy Photon Source - Test Facility. All power amplifier and power supply modules are pluggable from the front panel of the amplifier system. A 3-stage power combining topology was realized by using 32 power amplifier modules, 4 eight-way stripline power combiners, 2 two-way 35-kW coaxial power combiners, and 1 two-way 65-kW coaxial power combiner. Each power amplifier module is equipped with individual circulator and load utilizing an optimized cooling circuit design to ensure the entire amplifier system to be operational in both full-transmission and full-reflection scenarios. No final-stage high-power circulator or load is needed. The amplifier system is tunable in pulsed mode for any duty factors and fully functional in the continuous-wave mode as required. Excellent noise suppression and high wall-plug-to-RF efficiency were achieved at nominal power. Comfortable redundancies for both power amplifier and power supply modules were reserved to compensate for any hardware degradations during operations. Temperature, current, voltage, and RF signal of each module as well as cooling were monitored and managed by using EPICS in the control system of the amplifier. An interlock system was also integrated as well as an event logging system for post-mortem analysis. The system has accumulated over 2000 hours of operation. The design and performance tests of the first 166.6-MHz 50-kW modular solid-state power amplifier are presented.

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Development of a low-loss magnetic-coupling pickup for 166.6-MHz quarter-wave beta $$=$$ 1 superconducting cavities

Huang

Zhang

et al. 2020

NUCL SCI TECH

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The mechanical design, fabrication and tests of a 166.6 MHz quarter-wave beta=1 proof-of-principle superconducting cavity for HEPS

Cited by 13 publications

References 9 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

Design and performance tests of a modular 166.6-MHz 50-kW compact solid-state power amplifier for the HEPS-TF project

Development of a low-loss magnetic-coupling pickup for 166.6-MHz quarter-wave beta $$=$$ 1 superconducting cavities

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