STATUS OF CURE OF TRANSVERSE INSTABILITIES BY CHROMATICITY MODULATION AT NEWSUBARU

Chromaticity modulation by synchrotron frequency produces betatron tune spread inside of a bunch and suppress transverse instabilities in storage rings by Landau damping. We will apply this method to the NewSUBARU storage ring and are preparing and testing an AC sextuple magnet, a vacuum chamber for installation of an AC field transparent ceramics duct, and a tuning of a ring lattice for optimized dispersion at the magnet. The principle of the scheme, the current status of the experiment and the unwanted effect on a beam by misalignment and its tolerance are described.