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A&T Seminar
The Magnetic Model of the LHC at 6.5 TeV
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Europe/Zurich
30/7-018 - Kjell Johnsen Auditorium (CERN)
Description
After two years of shutdown, the Large Hadron Collider has been operated in 2015 at the energy of 6.5 TeV. In this seminar we give a first outlook of the behaviour of the LHC magnets operating at this field levels, corresponding to 8 T peak field in the main dipoles. The main magnetic features are reconstructed through the beam measurements, mainly the tune (quadrupolar components) and the chromaticity (sextupolar components). Data show a good knowledge of the main quadrupole components, in agreement with the precision of magnetic measurements. There is a non negligible impact of the main quadrupole component decay and snapback that needs correction through tuning quadrupoles.
For the b3, decay and snapback follow the experience and modelling built on magnetic measurements. The correction of the static part, corresponding to 7 units of b3 from injection to high field, ie around 300 chromaticity units, leaves a 15% residual that is presently not explained. It has been corrected with feed forward trims on chromatic sextupoles. The statistics of the beam measurements will be rather limited in the first stages of commissioning, but already reveals the main features of 6.5 TeV operation. An outlook for the operation of a very large machine as the FCC will be given, based on the LHC experience.
ATS Seminars Organisers: H. Burkhardt (BE), M. Modena (TE), T. Stora (EN)
Coffee / tea will be served after the seminar in room 30/7-012
