Studies of dual-harmonic acceleration at CSNS- II

陈锦芳,; 唐靖宇,

doi:10.1088/1674-1137/34/10/018

Cited by 10 publications

(4 citation statements)

References 8 publications

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“…where 𝑛 𝑡 = ℎ𝑁 𝑏 is the equivalent total particles in the ring, 𝜀 is the geometric transverse emittance and 𝐵 f = 𝐼/ Î is the bunching factor that is defined by the ratio of the average current 𝐼 to the peak current Î for a bunched beam. The bunching factor can be derived, for the stationary bucket of dual-harmonic RF system, as [29,30]:…”

Section: Space Charge Effects and Its Mitigationmentioning

confidence: 99%

Optimization of design parameters for SPPC longitudinal dynamics

Zhang¹,

Tang²,

Hong³

et al. 2021

J. Inst.

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As the second stage of the CEPC-SPPC project, SPPC (Super Proton-Proton Collider) aims at exploring new physics beyond the Standard Model. The key design goal for the SPPC accelerator complex is to reach 75 TeV in center of mass energy with a circumference of 100 km for the collider and an injector chain of four accelerators in cascade to support the collider. As an important part of the SPPC conceptual study, the longitudinal beam dynamics was studied systematically, which includes the dynamics in the collider and its complex injector chain. First, the bunch filling scheme of the SPPC complex was designed on the basis of various constraints such as the technical challenges of the kicker magnets, limited extraction energy per injection and so on. Next, the study on the longitudinal dynamics in the collider focused on the RF scheme to meet the requirements for luminosity and mitigate relevant instabilities. A higher harmonic RF system (800 MHz) together with the basic RF system (400 MHz) to form a dual-harmonic RF system was employed to mitigate collective instabilities and increase the luminosity by producing shorter bunches. In addition, the longitudinal matchings between the bunches in the different accelerator stages were studied, with special attention to the space charge effects and the beam loading effect in the two lower energy rings (p-RCS and MSS), which result in an optimization of the RF schemes. A set of self-consistent beam and RF parameters for the SPPC complex was obtained. The collider and the three proton synchrotrons of the injector chain have unprecedented features, thus this study demonstrates how a future proton-proton collider complex looks like.

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Section: Space Charge Effects and Its Mitigationmentioning

confidence: 99%

Optimization of design parameters for SPPC longitudinal dynamics

Zhang¹,

Tang²,

Hong³

et al. 2021

J. Inst.

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“…In the normal operation mode, the chopping factor is 50%; in the dedicated mode for a short-bunch beam for white neutron applications, a 30% chopping factor can be used. At the same time, the injection with an on-momentum beam instead of an offmomentum beam [18] is used. However, with the reduced longitudinal emittance, the transverse space charge effects become more important.…”

Section: Short-bunch Extraction At the Csns Rcsmentioning

confidence: 99%

Short-bunch extraction in a rapid cycling synchrotron

Zou

Tang

Chen

et al. 2014

Phys. Rev. ST Accel. Beams

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Short bunch beams of high intensity are required by many applications, and they are usually obtained by using bunch compression before the extraction in relatively slow cycling synchrotrons or accumulator rings. In this article, short bunch extraction by the bunch compression method is proposed to apply to a rapid cycling synchrotron (RCS) where the time duration is very limited to exploit the bunch compression process. The method is practically applied in the RCS of the China Spallation Neutron Source (CSNS) to obtain short-bunch beams for white neutron applications. Different short-bunch extraction scenarios have been studied, from keeping full beam power to reduced beam powers. A special desynchronization method is designed to solve the problem of slow acceleration during the bunch rotation process when the magnetic field is still ramping up. The space charge effect and beam loading effect during the bunch compression have also been taken into account in this high-intensity RCS. Multiparticle simulations have been carried out to show the effectiveness of the method with the input of the CSNS RCS. With a sacrifice of about twothirds of the beam power, the rms bunch length of the extracted beam can be reduced to about one-ninth of the one in the nominal operation mode.

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“…The China Spallation Neutron Source (CSNS) is advancing into its upgrade phase (CSNS-II), targeting a higher beam power up to 500 kW. The key parameters of CSNS-II can be found in table 1. The most important thing for the transverse and longitudinal beam dynamics is to address the strong space charge effect arising from the higher beam intensity.…”

Section: Introductionmentioning

confidence: 99%

“…The most important thing for the transverse and longitudinal beam dynamics is to address the strong space charge effect arising from the higher beam intensity. To counteract this, the dual-harmonic acceleration mechanism [1,2], which has already demonstrated its efficacy in mitigating the space charge effect, is slated for introduction. Given the limited tunnel space in the Rapid Cycling Synchrotron (RCS), only a high-gradient cavity can fulfil the needs for the second harmonic voltage.…”

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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Studies of dual-harmonic acceleration at CSNS- II

Cited by 10 publications

References 8 publications

Optimization of design parameters for SPPC longitudinal dynamics

Optimization of design parameters for SPPC longitudinal dynamics

Short-bunch extraction in a rapid cycling synchrotron

Development of dual-harmonic RF system for CSNS-II

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