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# CERN Published Articles

2022-06-26
06:02
 Luminosity Measurements and Systematic Uncertainties / Boyd, J (CERN) ; Schwick, C (CERN) This talk will briefly outline the main methods to measure the luminosity and to calibrate the luminosity detectors in the LHC experiments. It will discuss the size of the systematic uncertainties on the measured luminosity at the online and offline level [...] 2019 - 3 p. - Published in : (2019) , pp. 153-155 Fulltext: PDF; In : 8th Evian Workshop on LHC beam operation, Evian Les Bains, France, 12 - 14 Dec 2017, pp.153-155

2022-06-26
06:02
 Overview of the Beams from the Injectors / Albright, S (CERN) ; Bartosik, H (CERN) ; Bohl, T (CERN) ; Damerau, H (CERN) ; Di, G P (CERN) ; Findlay, A (CERN) ; Forte, V (CERN) ; Fraser, M (CERN) ; Huschauer, A (CERN) ; Kain, V (CERN) et al. The injectors have delivered different beam types for luminosity production in the LHC during the 2017 run. Besides the nominal beam with 25 ns spacing and 72 bunches at PS extraction, the batch-compression-merging-splitting (BCMS) beam with multiples of 48 bunches at extraction from the SPS has been produced [...] 2019 - 6 p. - Published in : (2019) , pp. 119-124 Fulltext: PDF; In : 8th Evian Workshop on LHC beam operation, Evian Les Bains, France, 12 - 14 Dec 2017, pp.119-124

2022-06-26
06:02
 Can we make the preparation of MDS more efficient? / Salvachua, B (CERN) In 2017, four Machine Development (MD) periods were scheduled at the LHC with the goal to study beam parameters and new ways to optimise the operation of the machine (LHC and HL-LHC). Before the start of the studies certain preparation and coordination is required in order to guarantee a successful MD (if the machine availability permits) [...] 2019 - 4 p. - Published in : (2019) , pp. 185-188 Fulltext: PDF; In : 8th Evian Workshop on LHC beam operation, Evian Les Bains, France, 12 - 14 Dec 2017, pp.185-188

2022-06-26
06:02
 Machine recovery and re-qualification / Zerlauth, M (CERN) ; Bernardi, M (CERN) ; Bednarek, M (CERN) ; Charifoulline, Z (CERN) ; Carlier, E (CERN) ; Chiggiato, P (CERN) ; Diangelo, G (CERN) ; Giachino, R (CERN) ; Pojer, M (CERN) ; Romera, I (CERN) et al. Restarting the LHC after the YETS 2017/18 initially included the revalidation of Sector 12 after its intended warm up and the repetition of powering and machine checkout tests as a function of the modifications applied to the relevant systems. This contribution will recall the main activities, the implied risks and resulting revalidation needs as well as the resulting planning to allow for an efficient restart of the LHC with beam in 2018 for its last year of physics operation in Run 2. 2019 - 4 p. - Published in : (2019) , pp. 193-196 Fulltext: PDF; In : 8th Evian Workshop on LHC beam operation, Evian Les Bains, France, 12 - 14 Dec 2017, pp.193-196

2022-06-26
06:02
 Status of the LHC emittance diagnostics / Trad, G (CERN) ; Alexopoulos, A (CERN) ; Baud, G (CERN) ; Bravin, E (CERN) ; Roncarolo, F (CERN) ; Vlachos, S (CERN) ; Wurkner, B (CERN) Measuring the beam transverse emittance is fundamental in every accelerator, in particular for the LHC, where its precise determination and preservation is essential to maximize the luminosity and thus the performance of the colliding beams. In this contribution, a review of the status of the synchrotron radiation monitors, the beam gas vertex detector and the wirescanners will be presented alongside the assessment of the obtained performance [...] 2019 - 5 p. - Published in : (2019) , pp. 147-151 Fulltext: PDF; In : 8th Evian Workshop on LHC beam operation, Evian Les Bains, France, 12 - 14 Dec 2017, pp.147-151

2022-06-26
06:02
 Machine configuration and parameters / Solfaroli Camillocci, M (CERN) 2017 has been a remarkable year for the LHC with more than 50 $fb^{-1}$ delivered to ATLAS and CMS and the peak luminosity largely overtaking the design value. Moreover, quite some time was spent to increase operational knowledge with technics that will be extremely important in the future, such that RF detuning, levelling, ATS optics. 2018 will be also a very important year, as a challenging target will be set to accumulate as much data as possible before the LS2, while marking the road toward HL-LHC. [...] 2019 - 3 p. - Published in : (2019) , pp. 209-211 Fulltext: PDF; In : 8th Evian Workshop on LHC beam operation, Evian Les Bains, France, 12 - 14 Dec 2017, pp.209-211

2022-06-26
06:02
 Instrumentation: What to expect next year? / Barros, J (CERN) ; Bravin, E (CERN) ; Effinger, E (CERN) ; Gasior, M (CERN) ; Jones, R (CERN) ; Kral, J (CERN) ; Lasch, M (CERN) ; Lefevre, T (CERN) ; Levens, T (CERN) ; Alves, D M Louro (CERN) et al. This paper presents the expectations for the LHC Beam Instrumentation systems going into the 2018 run. Planned upgrades during the YETS will be presented and opportunities for future development, in order to better exploit the available instrumentation, will be discussed. 2019 - 5 p. - Published in : (2019) , pp. 203-207 Fulltext: PDF; In : 8th Evian Workshop on LHC beam operation, Evian Les Bains, France, 12 - 14 Dec 2017, pp.203-207

2022-06-26
06:02
 Emittance Evolution in the LHC: From Injection to Collisions / Hostettler, M (CERN) ; Antoniou, F (CERN) ; Efthymiopoulos, I (CERN) ; Fuchsberger, K (CERN) ; Iadarola, G (CERN) ; Karastathis, N (CERN) ; Papadopoulou, S (CERN) ; Papaphilippou, Y (CERN) ; Pellegrini, D (CERN) The emittance of the LHC beams when arriving in collisions is a key parameter for luminosity. Hence, the emittance of the beams from the injector complex needs to be preserved as well as possible throughout the cycle for maximum luminosity [...] 2019 - 4 p. - Published in : (2019) , pp. 157-160 Fulltext: PDF; In : 8th Evian Workshop on LHC beam operation, Evian Les Bains, France, 12 - 14 Dec 2017, pp.157-160

2022-06-26
06:02
 From MD into Operational Use / Uythoven, J (CERN) ; Solfaroli, M (CERN) ; Tomas, R (CERN) The Machine Development studies performed over the last years have been analysed with the aim to assess their merit for operation of the LHC. Special attention is given to those MDs which have found a direct operational use [...] 2019 - 3 p. - Published in : (2019) , pp. 167-169 Fulltext: PDF; In : 8th Evian Workshop on LHC beam operation, Evian Les Bains, France, 12 - 14 Dec 2017, pp.167-169

2022-06-26
06:02
 Systems performance: Circuits / Antoine, A (CERN) ; Bednarek, M (CERN) ; Charifoulline, Z (CERN) ; Coelingh, G J (CERN) ; D'angelo, G (CERN) ; Denz, R (CERN) ; Montabonnet, V (CERN) ; Nielsen, J (CERN) ; Nisbet, D (CERN) ; Panev, B (CERN) et al. The performance of the LHC magnet circuits for the proton physics run in 2017 is evaluated. This contribution focuses on the availability of magnet powering (PC) and protection systems (QPS, EE, FMCM and Interlocks) and evaluates the impact of the new deployments, mainly the FGClite and RPADO power converters, on the overall performance of the machine [...] 2019 - 3 p. - Published in : (2019) , pp. 55-57 Fulltext: PDF; In : 8th Evian Workshop on LHC beam operation, Evian Les Bains, France, 12 - 14 Dec 2017, pp.55-57