Tuning knobs for the PS-SPS transfer line

Abstract

Transverse emittance preservation will be an important issue for the LHC injector chain. Minimization of the blowup at injection by tuning independently the Twiss parameters (α, β), the dispersion D and the dispersion derivative D is therefore mandatory. The optics of the transfer line between the PS and SPS machines was modeled 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.

Measurement and optimisation of the PS-SPS transfer line optics

“…The study described in this paper will continue during the 1999 run with particular attention to: precise measurement of the beam energy and adjustment of its control value accordingly, extension of the error analysis to all measurement stages, measurement of the dependence of mismatch on extraction conditions (energy, extraction trajectory), online measurement of optical parameters and matching correction [10].…”