Tuning Knobs for the PS-SPS Transfer Line

Transverse emittance preservation will be an important issue for the LHC injector chain. Minimisation of the blow-up at injection by tuning independently the Twiss parameters (a,b), the dispersion D and the dispersion derivative D' is therefore mandatory. The optics of the transfer line between the PS and SPS machines was modelled and matched using the program package MAD. Tuning knobs were developed using a singular value decomposition (SVD) algorithm. Coupled to the measurement of the Twiss parameters at a given point downstream of the correction elements they provide a fast correction algorithm for the betatron mismatch.