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Transverse emittance studies at extraction of the CERN PS Booster
/ Antoniou, Fanouria (CERN) ; Albright, Simon (CERN) ; Asvesta, Foteini (CERN) ; Bartosik, Hannes (CERN) ; Di Giovanni, Gian Piero (CERN) ; Forte, Vincenzo (CERN) ; Fraser, Matthew (CERN) ; Valdivieso, Ana (CERN) ; Huschauer, Alexander (CERN) ; Mikulec, Bettina (CERN) et al.
Transverse emittance discrepancy in the beam transfer between the Proton Synchrotron Booster (PSB) and the Proton Synchrotron (PS) is observed in operational conditions for the LHC beams at CERN. The ongoing LHC Injectors Upgrade (LIU) project requires a tight budget for beam degradation along the injector chain and therefore the reason for this emittance discrepancy needs to be understood. [...]
CERN-ACC-2019-085.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-MOPTS087
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPTS087
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Commissioning of Non-linear Optics in the LHC at Injection Energy
/ Maclean, Ewen (CERN) ; Carlier, Felix (CERN) ; Coello de Portugal, Jaime Maria (CERN) ; Garcia-Tabares, Ana (CERN) ; Langner, Andy (CERN) ; Malina, Lukas (CERN) ; Persson, Tobias (CERN) ; Skowroński, Piotr (CERN) ; Tomás, Rogelio (CERN)
Commissioning of the nonlinear optics at injection in the LHC was carried out for the first time in 2015 via beam-based methods. Building upon studies performed during Run I, corrections to the nonlinear chromaticity and detuning with amplitude were obtained. [...]
CERN-ACC-2016-177.-
2016 - 4 p.
- Published in : 10.18429/JACoW-IPAC2016-THPMR039
Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.THPMR039
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LHC Run 2 optics commissioning experience in view of HL-LHC
/ Tomás, Rogelio (CERN) ; Carlier, Felix (CERN) ; Coello, Jaime (CERN) ; Dilly, Joschua (CERN) ; Fartoukh, Stephane (CERN) ; Fol, Elena (CERN) ; Gamba, Davide (CERN) ; Garcia-Tabares, Ana (CERN) ; Giovannozzi, Massimo (CERN) ; Hofer, Michael (CERN) et al.
LHC Run 2 has achieved a $\beta^*$ lower than a factor 2 below design. This has significantly challenged optics measurement and correction techniques in the linear and non-linear regimes, leading to the development of new approaches. [...]
CERN-ACC-2019-066.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-MOPMP033
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPMP033
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LHC optics measurement and correction software progress and plans
/ Tomás, Rogelio (CERN) ; Cardona, Javier (Colombia, U. Natl.) ; Carlier, Felix (CERN) ; Coello, Jaime (CERN) ; Dilly, Joschua (CERN) ; Fol, Elena (CERN) ; Garcia-Tabares, Ana (CERN) ; Hofer, Michael (CERN) ; Maclean, Ewen (CERN) ; Malina, Lukas (CERN) et al.
LHC Optics Measurements and Corrections (OMC) require efficient on-line software applications to acquire and analyze data and to compute the necessary corrections. During Run 2 various measurement and correction techniques have been merged to yield unprecedented optics quality, increasing the required number of steps to finalize the optics commissioning and the size of the software project. [...]
CERN-ACC-2019-200.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-WEPGW116
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPGW116
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Limitations on Optics Measurements in the LHC
/ Skowroński, Piotr (CERN) ; Carlier, Felix (CERN) ; Coello de Portugal, Jaime Maria (CERN) ; Garcia-Tabares, Ana (CERN) ; Langner, Andy (CERN ; Hamburg U.) ; Maclean, Ewen (CERN) ; Malina, Lukas (Oslo U. ; CERN) ; McAteer, Meghan (CERN) ; Persson, Tobias (CERN) ; Tomás, Rogelio (CERN)
In preparation of the optics commissioning at an energy of 6.5 TeV, many improvements have been done to cope with the expected reduced signal to noise ratio due to lowered bunch intensities imposed by machine protection considerations. This included, among others, an increase of the flat top duration of the AC dipole excitations, which allowed to use more turn-by-turn data for the analysis. [...]
CERN-ACC-2016-185.-
2016 - 4 p.
- Published in : 10.18429/JACoW-IPAC2016-THPMB044
Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.THPMB044
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Optics-measurement-based BPM Calibration
/ Garcia-Tabares, Ana (CERN) ; Carlier, Felix (CERN) ; Coello de Portugal, Jaime Maria (CERN) ; Langner, Andy (CERN) ; Maclean, Ewen (CERN) ; Malina, Lukas (CERN) ; Persson, Tobias (CERN) ; Skowroński, Piotr (CERN) ; Solfaroli Camillocci, Matteo (CERN) ; Tomás, Rogelio (CERN)
The LHC beta functions (β) can be measured using the phase or the amplitude of betatron oscillations obtained with beam position monitors (BPMs). Using the amplitude information results in a β measurement affected by BPM calibration. [...]
CERN-ACC-2016-188.-
2016 - 4 p.
- Published in : 10.18429/JACoW-IPAC2016-THPMB041
Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.THPMB041
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New Methods for Measurement of Nonlinear Errors in LHC Experimental IRs and Their Application in the HL-LHC
/ Maclean, Ewen (CERN) ; Carlier, Felix (CERN) ; Coello de Portugal, Jaime Maria (CERN) ; Garcia-Tabares, Ana (CERN) ; Giovannozzi, Massimo (CERN) ; Malina, Lukas (CERN) ; Persson, Tobias (CERN) ; Skowroński, Piotr (CERN) ; Tomás, Rogelio (CERN)
Studies of nonlinear errors in LHC experimental insertions (IRs) during Run 1 were based upon feed-down to tune and coupling from the crossing angle orbit bumps. Useful for validating the magnetic model, this method alone is of limited use to understand discrepancies between magnetic and beam-based measurement. [...]
CERN-ACC-2017-166.-
2017 - 4 p.
- Published in : 10.18429/JACoW-IPAC2017-WEPIK093
Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.WEPIK093
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Experience with DOROS BPMs for Coupling Measurement and Correction
/ Persson, Tobias (CERN) ; Coello de Portugal, Jaime Maria (CERN) ; Garcia-Tabares, Ana (CERN) ; Gąsior, Marek (CERN) ; Langner, Andy (CERN) ; Lefèvre, Thibaut (CERN) ; Maclean, Ewen (CERN) ; Malina, Lukas (CERN) ; Olexa, Jakub (CERN) ; Skowroński, Piotr (CERN) et al.
The Diode ORbit and OScillation System (DOROS) system is designed to provide accurate measurements of the beam position in the LHC. The oscillation part of the system, which is able to provide turn-by-turn data, is used to measure the transverse coupling. [...]
CERN-ACC-2016-303.-
2016 - 3 p.
- Published in : 10.18429/JACoW-IPAC2016-MOPMR029
Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.MOPMR029
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Local Optics Corrections in the HL-LHC IR
/ Coello de Portugal, Jaime Maria (CERN ; Barcelona, Polytechnic U.) ; Carlier, Felix (CERN) ; Garcia-Tabares, Ana (CERN) ; Langner, Andy (CERN) ; Maclean, Ewen (CERN) ; Malina, Lukas (CERN) ; Persson, Tobias (CERN) ; Skowroński, Piotr (CERN) ; Tomás, Rogelio (CERN)
For the high luminosity upgrade of the LHC optics correction in the interaction regions is expected to be challenged by the very low β^{*} and the sizable expected quadrupolar errors in the triplet. This paper addresses the performance and limitations of the segment-by-segment technique to correct quadrupolar and skew quadrupolar errors in the HL-LHC IR via computer simulations. [...]
CERN-ACC-2016-176.-
2016 - 4 p.
- Published in : 10.18429/JACoW-IPAC2016-THPMR040
Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.THPMR040
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