Speaker
Description
We propose Near Resonance Polarization Modulation (NRPM), a novel method for high-precise beam energy measurement in storage rings. In this technique, a constant-frequency AC kicker is applied near the spin precession frequency, driving the beam spins coherently. The spin tune can be reliably extracted from the time-dependent polarization signal, enabling a very high-precision determination of the beam energy. Its performance has been demonstrated using the Future Circular Collider e+e- (FCC-ee) Z-pole lattice, exploring a range of configurations including AC kicker strengths and initial polarization levels. The method exhibits robustness against lattice imperfections. Compared to the traditional resonant depolarization (RDP) technique and the free spin precession (FP), NRPM offers significantly improved precision, greater tolerance to systematic uncertainties, and simplified operational procedures. Beyond the FCC-ee case study, NRPM is broadly applicable to high-precision energy determination in modern storage rings. The superior precision offered by this technique will significantly advance the state-of-the-art in beam energy measurement, with critical applications in high-energy physics and the measurement of fundamental constants.
Funding Agency
Work supported by the Swiss Accelerator Research and Technology (CHART)
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