Work

Modeling of beam envelope instabilities in high-intensity circular accelerators

Year: 2025

Type: article

Abstract: With the growing demand for the high-intensity hadron beams in various applications in recent years, coherent beam instabilities driven by space charge are of critical concern for those high-intensity hadron accelerator projects, where the plasma dynamics of beams is pronounced and requires careful consideration. In this paper, an analytical model is developed to characterize coherent beam instabilities in circular machines. Based on the proposed model, a coherent mode, namely the vertical coupled mode, is identified. It is demonstrated that the tilting instability is more enhanced in circular machines because of the increased anisotropy from dispersion. Moreover, the well-known envelope instability in linear accelerator can be generalized and classified into “a family of envelope instabilities” for high-intensity circular accelerators. The proposed analytical model has been compared to particle-in-cell simulations and shows good agreement. The chart of the envelope instability family can be adopted for optimization of the working point to achieve higher beam intensity.

Source: Physical Review Research

DOI: 10.1103/c1dn-z4n9

Author: Yao-shuo Yuan

Institutions: China Spallation Neutron Source, Institute of High Energy Physics, University of Chinese Academy of Sciences, Spallation Neutron Source

Language: English

Topic: Particle accelerators and beam dynamics

Subfield: Aerospace Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,625

Funders: National Natural Science Foundation of China, Chinese Academy of Sciences, Basic and Applied Basic Research Foundation of Guangdong Province