Central frequency measurement of the HLS-II storage ring

TL;DR

This paper details the measurement of the HLS-II storage ring's central frequency using a sextupole modulation method, confirming the ring's circumference aligns with design specifications.

Contribution

It introduces an optimized measurement method and a Matlab-based workflow for accurately determining the storage ring's central frequency.

Findings

Measured central frequency confirms ring circumference matches design

Two measurement methods yield consistent results

Error sources are analyzed and minimized

Abstract

Central frequency is a key parameter of storage rings. This paper presents the measurement of central frequency of the HLS-II storage ring using the sextupole modulation method. Firstly, the basis of central frequency measurement of the electron storage ring is briefly introduced. Then, the error sources and the optimized measurement method for the HLS-II storage ring are discussed. The workflow of the self-compiled Matlab script used in central frequency measurement is also described. In the end, the results achieved by using two methods to cross-check each other are shown. The measured value of the central frequency demonstrates that the real circumference of the HLS-II storage ring agrees well with the designed value.