End of CNGS run


8th NBI2012 workshop at CERN


First tau-neutrino candidate detected

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Project Organization:  Secondary Beam WG, Project Team, Technical WG, Commissioning WG
Protons for CNGS are accelerated through the existing chain of Linac, Booster, Proton Synchrotron and Super-Synchrotron (SPS). The proton energy at extraction from the SPS to CNGS is 400 GeV. Examples of SPS supercycles during CNGS operation with other users are shown below.

The protons are extracted from the SPS with a fast kicker system in two batches (marked FE for fast extraction) of 10.5 ms each, with 50 ms time between the two extractions. The microstructure of the beam reflects the 200 MHz radiofrequency system of the SPS - each batch will consist of a train of bunches interspaced by 5 ns, the length of a single bunch is expected to be 2 - 3 ns.

The intensity circulating in the SPS per cycle can reach 4.8x1013 protons, thus about 2.4 x1013 protons per fast extraction can be expected. Assuming an overall efficiency of 55% and a running time of 200 days per year in a co-user mode (filling LHC, etc.), it is estimated that 4.5 x1019 protons can be delivered to the CNGS target per year.