PRESERVATION OF THE TRANSVERSE EMITTANCE OF THE LHC BEAM IN THE SPS

Preserving the emittance during the injection process in an ideal acce lerator and transfer line is trivial for beams which are transversely stable (eventually with feedback). To approach as much as possible the ideal state with a real machine it is sufficient, but not trivial, to measure the deviations from that state and correct them. The survey o f the SPS and its injection line in view of transverse emittance conse rvation leads essentially to a demand for efficient instrumentation an d implementation of specific measuring strategies.