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For decades, synchrotron radiation facilities have provided powerful research tools for a variety of photon sciences, industrial use, and other purposes. In [[9]], we discussed the suppression of emittance variation in extremely low emittance light sources and demonstrated that the emittance variation could be reduced to less than 1% and passively maintained by carefully optimizing the operating condition of insertion devices. The electron energy was optimized at 6 GeV to reduce the natural electron emittance, while covering the same range of X-rays with shorter period undulators. There is no such magnet for NanoTerasu and, more importantly, the LGB magnets are expected to be made using a permanent magnet for SPring-8-II that does not exist for NanoTerasu. [Extracted from the article]

For many years, scientists around the world have sought an ultra-low-emittance ring-based light source that offers greater performance than existing third-generation light sources. Pioneering work on the seven-bend lattice for MAX IV [1] initiated these efforts. Another significant development was the scheme for nonlinearity control based on “phase-matched” sextupole pairs. This configuration, first introduced in a light source design by the ESRF design group [2], efficiently suppresses strong nonlinear resonances induced by sextupoles for chromaticity correction. Since a small dynamic aperture due to the strong nonlinearities mentioned earlier presents a great obstacle when we attempt to lower the beam emittance of a high-energy light source using individual bending magnets with small deflection angles, the ESRF scheme contributes significantly to the emittance reduction that can be practically achieved. [ABSTRACT FROM PUBLISHER]