Speaker
Description
In the Super Tau-Charm Facility (STCF) Main Linac, intense short-range longitudinal wakefields from high-charge bunches cause severe energy spread degradation and nonlinear longitudinal phase space (LPS) distortions. We present an analytical model describing LPS evolution under RF acceleration, wakefields, and longitudinal space charge. By utilizing an equivalent truncated-Gaussian distribution, we derived closed-form analytical expressions for the high-order moments of the LPS. Based on this, an analytical optimization method is proposed to determine the optimal RF phase that minimizes the root-mean-square (RMS) energy spread. Theoretical predictions show excellent agreement with Elegant macro-particle tracking simulations, particularly in the core bunch region. With this optimized configuration, wakefield-induced degradation is effectively compensated, successfully fulfilling the stringent beam requirements of the STCF.
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