| Published Articles | |
| Title | Optics and Non-Linear Beam Dynamics at 4 and 6.5 TeV |
| Author(s) | Tomás, R (CERN) ; Bach, T (CERN) ; Hagen, P (CERN) ; Langner, A (CERN) ; Levinsen, Y I (CERN) ; Mcateer, M J (CERN) ; Maclean, E H (CERN) ; Persson, T H B (CERN) ; Skowronski, P (CERN) ; White, S (CERN) |
| Publication | Geneva : CERN, 2012 |
| Number of pages | 12 |
| In: | 4th Evian Workshop on LHC beam operation, Evian-les-Bains, France, 17 - 20 Dec 2012, pp.171-182 |
| Subject category | Accelerators and Storage Rings |
| Accelerator/Facility, Experiment | CERN LHC |
| Abstract | 2012 has been an extraordinary year for the control and understanding of the LHC optics. A record low β-beating of about 7% has been achieved during nominal operation. Consequently the luminosity imbalance between the two main experiments has also achieved a record low value. Magnet experts have found 1% gradient errors in some MQY quadrupoles, which are in good agreement with the beam-based optics corrections. A large effort has been put into probing the polarity of the non-linear correction circuits. So far more than 60 sextupolar and octupolar circuits have been probed revealing some inconsistencies. A large collection of new optics has been tested, including the post LS1 baseline β * =0.4 m. Dedicated MDs have brought first time achievements in the LHC non-linear beam dynamics regime, namely: (i) measurement of DA at injection, (ii) chromatic coupling correction, (iii) IR non-linear corrections at β * =0.6 m, and (iv) the direct measurement of amplitude detuning with AC dipoles. All of these accomplishments give a comfortable basis to make projections and recommendations towards 6.5 TeV. |
Corresponding record in: Inspire
Notice créée le 2018-01-31, modifiée le 2019-03-12
