Effects of tracking errors on the SOLEIL II booster

For the upgrade of SOLEIL II a new booster with reduced transverse and longitudinal beam sizes is required. The new booster follows a 16 BA Higher-Order Achromat lattice with a reduced emittance to about 5 nm rad at 2.75 GeV. At the end of the ramp an emittance exchange is foreseen to allow for more flexibility in the injection parameters into the storage ring. In order for a good efficiency of the emittance exchange, the coupling of the lattice has to be well controlled. This is achieved with a LOCO routine for coupling using 10 skew quadrupoles, but the so-called random tracking errors from the ramping magnet power supplies introduce noise in the response matrix measurement.Furthermore, an online measurement setup for the beam sizes using visible light and a slit mirror needs a careful beam position evaluation, which may be affected by tracking errors. For both these items, this contribution outlines the efforts and results achieved.