Speaker
Description
To mitigate the intra-beam scattering effects and improve Touschek lifetime, a full-coupling operation based on the linear difference resonance is preliminarily studied for the Hefei Advanced Light Facility (HALF). The dependence of coupling ratio on skew quadrupole strength and the distance to the difference resonance is analyzed. With a coupling ratio of 90%, particle tracking simulations confirm that the expected equilibrium emittances are achieved. However, beam loss occurs during the off-axis injection due to the excitation of the vertical motion. Amplitude-dependent tune shifts are tailored by reducing the octupole strengths to shift the injected beam away from the coupling resonance, which suppresses the beam loss effectively. This study demonstrates the feasibility of high-coupling operation in HALF and highlights the importance of optimizing nonlinear detuning for good injection efficiency.
Funding Agency
This work was supported by the Fundamental Research Funds for the Central Universities (No. WK2310250135, No. WK2310000107).
| Paper status | Resubmitted proceeding files received and assigned to an editor. Accepted by Submitter. |
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