Development of a large nanocrystalline soft magnetic alloy core with high μ′pQf products for CSNS-II

Wu, Benhong; Li, Xiao; Li, Zhun; Zhang, Chunlin; Liu, Yang; Wei, Long; Li, Xiang; Wu, Jiawei

doi:10.1007/s41365-022-01087-x

Cited by 11 publications

(4 citation statements)

References 20 publications

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“…Unfortunately, export regulations hinder the procurement of these MA cores, necessitating the development of a high-performance MA core. We have developed a MA core measuring 850 mm (outer diameter) ×316 mm (inner diameter) ×25 mm (thickness) by winding nanocrystalline soft magnetic alloy ribbon, with a thickness of approximately 18 μm and a width of 25 mm [4]. The model of the MA ribbon, 1k107B, has the composition of Fe 84 Cu 1 Nb 5.5 Si 8.2 B 1.3 (at %) and is manufactured through a single roll rapid solidification method.…”

Section: Figurementioning

confidence: 99%

Magnetic Alloy Core Loaded 2^nd harmonic cavity design and testing for CSNS-II RCS

Wu,

Li,

Nie

et al. 2024

J. Phys.: Conf. Ser.

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In this report, we present our recent progress in the design and high-power testing of the 2nd harmonic cavity for the China Spallation Neutron Source upgrade project. To achieve optimal performance, high-performance magnetic alloy (MA) cores with dimensions of Φ850mm × Φ316mm × 25mm were meticulously developed and fabricated to serve as the load material for the radio-frequency (RF) cavity. Through rigorous testing, we were able to achieve a remarkable cavity accelerating gradient of over 40 kV/m under 15% duty cycle. To ensure optimal cooling efficiency, we conducted a comprehensive fluid dynamics simulation analysis and verified our results through experiments. Finally, to assess the long-term stability and performance of the cavity, we conducted a series of extended operation tests. These experiments successfully confirmed the high-performance capabilities and exceptional stability of the 2nd harmonic cavity.

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Section: Figurementioning

confidence: 99%

Magnetic Alloy Core Loaded 2^nd harmonic cavity design and testing for CSNS-II RCS

Wu,

Li,

Nie

et al. 2024

J. Phys.: Conf. Ser.

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“…For operations at a 100 Hz repetition rate, the acceleration time is quite short, meaning the duty cycle of the cavity operation is merely 22.2%. The magnetic alloy cores in the cavity can be cooled by a direct cooling method [27].…”

Section: Longitudinal Motion 41 Rf Parameters For Accelerationmentioning

confidence: 99%

Design and beam dynamics validation of a spiral FFAG accelerator for CSNS-II

Wu,

Zhou,

et al. 2024

J. Inst.

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The fixed-field alternating gradient (FFAG) accelerator, with its compact structure and the combined advantages of high energy from synchrotrons and high beam intensity from cyclotrons, offers unparalleled benefits in accelerating protons, heavy ions, and short-lived particles such as muons and unstable nuclei. The China Spallation Neutron Source plans to establish an FFAG accelerator with a diameter of 20 meters at the end of the negative hydrogen linac for various purposes, including experiments in nuclear physics and medical applications. For this design, a scaling scheme using spiral magnets as the basic focusing structure is investigated to provide the proton beam with kinetic energy ranging from 300 MeV to 600 MeV. We present the design results for the scaling FFAG accelerator and discuss the optimization of the cell tune. A detailed beam dynamics verification and discussion of the proposed FFAG accelerator lattice are presented using the ray-tracing code Zgoubi, including off-axis optical characteristics, large amplitude transverse motion, and full-cycle longitudinal acceleration. The FFAG accelerator is demonstrated to provide a large transverse and longitudinal acceptance for the tracking beam in the designed lattice. A new simulation code based on Python for the study of FFAG accelerator beam dynamics has been developed, and the corresponding verification results are also presented.

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“…Consequently, ferrite-loaded cavities, constrained by their low saturation flux density, fall short in comparison. Magnetic alloy (MA) loaded cavities, celebrated for their standout saturation flux density and permeability [3,4], emerge as the top choice for high-gradient applications. Their low Q-value and broad bandwidth further position them as uniquely capable of providing both fundamental frequency and second harmonic voltages without the necessity of a tuning loop.…”

Section: Introductionmentioning

confidence: 99%

Development of dual-harmonic RF system for CSNS-II

Wu,

et al. 2024

J. Inst.

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The upgrade of the China Spallation Neutron Source (CSNS-II) encompasses the development of a dual harmonic RF system for the Rapid Cycling Synchrotron (RCS). The objective of this system is to achieve a maximum second harmonic voltage of 100 kV. To meet this requirement, a high gradient cavity is being used in place of the traditional ferrite loaded cavity. Magnetic alloy (MA) loaded cavities, which can attain very high field gradients, have demonstrated their suitability for high-intensity proton synchrotrons. As a result, designing an RF system with MA-loaded cavities has emerged as a primary focus. Over the past decade, substantial advancements have been made in the development of MA-loaded cavities at CSNS. This paper provides an overview of the RF system that incorporates the MA-loaded cavity and presents the high-power test and beam test results of the system.

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Development of a large nanocrystalline soft magnetic alloy core with high μ′pQf products for CSNS-II

Cited by 11 publications

References 20 publications

Magnetic Alloy Core Loaded 2^nd harmonic cavity design and testing for CSNS-II RCS

Magnetic Alloy Core Loaded 2^nd harmonic cavity design and testing for CSNS-II RCS

Design and beam dynamics validation of a spiral FFAG accelerator for CSNS-II

Development of dual-harmonic RF system for CSNS-II

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Development of a large nanocrystalline soft magnetic alloy core with high μ′pQf products for CSNS-II

Cited by 11 publications

References 20 publications

Magnetic Alloy Core Loaded 2nd harmonic cavity design and testing for CSNS-II RCS

Magnetic Alloy Core Loaded 2nd harmonic cavity design and testing for CSNS-II RCS

Design and beam dynamics validation of a spiral FFAG accelerator for CSNS-II

Development of dual-harmonic RF system for CSNS-II

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Magnetic Alloy Core Loaded 2^nd harmonic cavity design and testing for CSNS-II RCS

Magnetic Alloy Core Loaded 2^nd harmonic cavity design and testing for CSNS-II RCS