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- E. Gschwendtner, L. Bruno, K. Elsener, A. Ferrari, M. Meddahi, A. Pardons, S. Rangod
CERN, Geneva
- A. Guglielmi
INFN/LNL, Legnaro, Padova
- P. R. Sala
INFN-Milano, Milano
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An intense muon-neutrino beam (1017 nu-mu/day) is generated at CERN and directed towards the Gran Sasso National Laboratory, LNGS, in Italy, 732 km away from CERN. The muon-neutrinos are produced in association with muons in the decay of the pions and kaons created in the target. In the presently approved physics programme, it is foreseen to run the CNGS facility with 4.5 · 1019 protons/year for five years. During a CNGS cycle, i.e. every 6s, two nominal SPS extractions of 2.4 ·1013 protons each at 400GeV/c are sent down the proton beam line to the target. The CNGS secondary beam line, starting with the target, has to cope with this situation, which pushes the beam line equipment and instrumentation to the limits of radiation hardness, mechanical stresses, etc. during the CNGS operation. An overview of the CNGS secondary beam line will be shown. Emphasis will be on the target, the magnetic focusing lenses (horn and reflector) and the muon monitors. The performance of the secondary beam line during beam commissioning and physics operation will be discussed and measurements compared with simulations.
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