| Paper |
Title |
Page |
| MOPJE052 |
Observations of an Anomalous Octupolar Resonance in the LHC |
412 |
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- F.S. Carlier, J.M. Coello de Portugal, A. Langner, E.H. Maclean, T. Persson, R. Tomás, R. Westenberger
CERN, Geneva, Switzerland
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While linear LHC dynamics is mostly understood and under control, non-linear beam dynamics will play an increasingly important role in the challenging regimes of future LHC operation. In 2012, turn-by-turn measurements of large betatron excitations of LHC Beam 2 at injection energy were carried out. These measurements revealed an unexpectedly large spectral line in the horizontal motion with frequency Qx+2Qy. Detailed analyses and simulations are presented to unveil the nature of this spectral line.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2015-MOPJE052
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| MOPJE054 |
Developments of the Segment-by-Segment Technique for Optics Corrections in the LHC |
419 |
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- A. Langner, J.M. Coello de Portugal, P.K. Skowroński, R. Tomás
CERN, Geneva, Switzerland
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Optics correction algorithms will become even more critical for the operation of the LHC at 6.5 TeV. For the computation of local corrections the segment-by-segment technique is used. We present improvements to this technique and an advanced error analysis, which increase the sensitivity for finding local corrections. Furthermore, we will investigate limitations of this method for lower beta-star optics as they will be used in the high-luminosity LHC (HL-LHC) upgrade.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2015-MOPJE054
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| MOPJE056 |
OMC Software Improvements in 2014 |
426 |
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- J.M. Coello de Portugal, F.S. Carlier, A. Langner, T. Persson, P.K. Skowroński, R. Tomás
CERN, Geneva, Switzerland
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We present the LHC Optics Measurement and Corrections (OMC) software developments done during 2014 on stability, performance and usability. This software is used to analyze turn-by-turn data and compute optics corrections to get the best performance of the LHC. The main developments have been an automatic local correction script to get faster and more accurate corrections in the interaction regions, a self contained test for the whole software package to avoid mistakes during the software development and the improvements in the software quality and efficiency of the Segment by Segment technique script. We also present a study of the code quality in its current status.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2015-MOPJE056
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| MOPJE057 |
Optics Measurement using the N-BPM Method for the ALBA Synchrotron |
430 |
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- A. Langner, J.M. Coello de Portugal, R. Tomás
CERN, Geneva, Switzerland
- G. Benedetti, M. Carlà, U. Iriso, Z. Martí
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
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The N-BPM method recently developed for the LHC has significantly improved the precision of optics measurements which are based on beam position monitor (BPM) turn-by-turn data. The main improvement is owed to the consideration of correlations for statistical and systematic error sources, as well as increasing the amount of BPM combinations for one measurement. We present how this technique can be applied at light sources like ALBA, and compare the results with other methods.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2015-MOPJE057
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