
A 499.8 MHz SOLEIL-type superconducting cavity was simulated and designed for the first time in this paper. The higher-order mode (HOM) properties of the cavity were investigated. Two kinds of coaxial HOM couplers were designed. Using 4 L-type and 4 T-type HOM couplers, the longitudinal impedance and the transverse impedances were suppressed to below 3 kΩ and 30 kΩ/m, respectivly. The HOM damping requirements of Hefei Advanced Light Facility (HALF) were satisfied. This paper conducted an in-depth study on the radio frequency (RF) design, multipacting optimization, and thermal analysis of these coaxial couplers. Simulation results indicated that under operating acceleration voltage, the optimized couplers does not exhibit multiplicating or thermal breakdown phenomena. The cavity has the potential to reach a higher acceleration gradient.
HOM damping design for 499.8 MHz SOLEIL-type cavity.
[1] |
Padamsee H. 50 years of success for SRF accelerators—a review. Superconductor Science and Technology, 2017, 30: 053003. DOI: 10.1088/1361-6668/aa6376
|
[2] |
Padamsee H, Knobloch J, Hays T, et al. RF superconductivity for accelerators. Physics Today, 1999, 52: 54. DOI: 10.1063/1.882759
|
[3] |
Mosnier A, Chel S, Hanus X, et al. Design of a heavily damped superconducting cavity for SOLEIL. In: Proceedings of the 1997 Particle Accelerator Conference (Cat. No. 97CH36167). Vancouver, Canada: IEEE, 1997 : 1709–1711.
|
[4] |
Marchand P, Baete J P, Cuoq R, et al. Operational experience with the SOLEIL superconducting RF system. In: 16th International Conference on Radio-Frequency Superconductivity. Paris: JACoW, 2013 : MOP064.
|
[5] |
Nadolski L S, Abeillé G, Abiven Y-M, et al. SOLEIL status report. In: 9th International Particle Accelerator Conferience. Vancouver, Canada: JACoW, 2018 : THPMK092.
|
[6] |
Furuya T, Asano K, Ishi Y, et al. Superconducting accelerating cavity for KEK B-factory. In: Proceedings of the 1995 Workshop on RF Superconductivity. Gif-sur-Yvette, France: JACoW, 1995 : 729–733.
|
[7] |
Huang T, Pan W, Wang G, et al. The development of the 499.8 MHz superconducting cavity system for BEPCII. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2021, 1013: 165649. DOI: 10.1016/j.nima.2021.165649
|
[8] |
Wu C F, Tang Y, Tan M, et al. Research of the 499.8 MHz superconducting cavity system for HALF. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2023, 1050: 168176. DOI: 10.1016/j.nima.2023.168176
|
[9] |
Marhauser F. Next generation HOM-damping. Superconductor Science and Technology, 2017, 30: 063002. DOI: 10.1088/1361-6668/aa6b8d
|
[10] |
Craievich P, Bosland P, Chel S, et al. HOM couplers design for the SUPER-3HC cavity. In: PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No. 01CH37268). Chicago, USA: IEEE, 2001 : 1134–1136.
|
[11] |
Rimmer R A, Byrd J M, Li D. Comparison of calculated, measured, and beam sampled impedances of a higher-order-mode-damped RF cavity. Physical Review Special Topics Accelerators and Beams, 2000, 3: 102001. DOI: 10.1103/PhysRevSTAB.3.102001
|
[12] |
Rimmer R A. Higher-order mode calculations, predictions and overview of damping schemes for energy recovering linacs. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2006, 557: 259–267. DOI: 10.1016/j.nima.2005.10.080
|
[13] |
Haebel E. Couplers for cavities. In: CAS–CERN Accelerator School: Superconductivity in Particle Accelerators. Geneva, Switzerland: CERN, 1996: 231–264.
|
[14] |
Sekutowicz J. Higher order mode coupler for TESLA. In: Proceedings of the Sixth Workshop on RF Superconductivity. Newport News, USA: CEBAF, 1993 : 426–439.
|
[15] |
Papke K, Gerigk F, van Rienen U. Comparison of coaxial higher order mode couplers for the CERN Superconducting Proton Linac study. Physical Review Accelerators and Beams, 2017, 20: 060401. DOI: 10.1103/PhysRevAccelBeams.20.060401
|
[16] |
Romanov G, Berrutti P, Khabiboulline T. Simulation of multipacting in SC low beta cavities at FNAL. In: 6th International Particle Accelerator Conference. Richmond, USA: JACoW, 2015 : 579–581.
|
[17] |
Merio M. Material properties for engineering analysis of SRF cavities. Batavia, USA: FermiLab, 2011 : Fermilab Specification 5500.000-ES-371110.
|
[18] |
Yu H, Liu J, Hou H, et al. Simulation of higher order modes and loss factor of a new type of 500-MHz single cell superconducting cavity at SSRF. Nuclear Science and Techniques, 2011, 22 (5): 257–260. DOI: 10.13538/j.1001-8042/nst.22.257-260
|