Lattice optimization for the HLS-II storage ring

Abstract

Lattice optimization for the HLS-storage ring * BAI Zheng-He( ) 1) WANG Lin( ) 2) JIA Qi-Ka( ) LI Wei-Min( )

Lattice study for the HLS-II storage ring

“…The natural emittance is 14.9 nm•rad, which is close to the lowest emittance 14.0 nm•rad found in the global scan. The values of β x and β y at the center of the long straight section are, respectively, 18.74 m and 0.88 m, and β x and β y at the center of the medium straight section are, respectively, 0.92 m and 0.90 m. Note that of these beta values, three are less than 1 m. The dispersion function in the medium straight section is 0.42 m, which is lower than that of the previous non-achromatic lattice [3]. The dispersion function in the long straight section is 0.77 m. The working point is (5.210, 3.727), and the momentum compaction factor is 0.0129.…”

“…The natural emittance is 33.4 nm•rad. The values of β x and β y at the center of the long straight section are, respectively, 17.44 m and 1.86 m, and β x and β y at the center of the medium straight section are, respectively, 2.34 m and 1.10 m. The dispersion function in the medium straight section is 0.78 m. All these lattice parameters are lower than those of the previous achromatic lattice [3]. The working point of this lattice is (4.616, 3.568), and the momentum compaction factor is 0.0205.…”

“…In our laboratory, the global scan method was applied to the lattice design of the HLS-storage ring [3], and the obtained data provided us with global solutions and their lattice parameters. Thus, for all the solutions of interest, we can directly use their lattice parameters to calculate R V for long and medium straight sections in both the achromatic and non-achromatic modes.…”

Central RF frequency measurement of the HLS-II storage ring

“…And the adjacent sextupoles and quadrupoles are aligned with respect to each other with the accuracy lower than 0.08 mm [9]. On the other hand, the HLS-II storage ring uses two sextupole families (denote as S3 and S4 and each family has 8 identical sextupoles) in the dispersion sections to correct the chromaticity [10]. And the Eq.…”

Control infrastructure monitoring system at the NSRL facility cluster

“…The National Synchrotron Radiation Laboratory (NSRL) facility cluster is a collection of user facilities developed by NSRL of the University of Science and Technology of China (USTC), including the Hefei Light Source-II (HLS-II), the Tunable Infrared Laser for Fundamental of Energy Chemistry (FELiChEM), and the THz near-field high-flux material physical property test system (NFTHZ). HLS-II is a vacuum ultraviolet synchrotron light source [1]. FELiChEM is an experimental facility dedicated to energy chemistry research and is the first infrared free-electron laser user facility in China [2].…”