| Published Articles | |
| Title | First LHC Emittance Measurements at 6.5 TeV |
| Author(s) | Kuhn, Maria (CERN) ; Antoniou, Fanouria (CERN) ; Bravin, Enrico (CERN) ; Dehning, Bernd (CERN) ; Emery, Jonathan (CERN) ; Kain, Verena (CERN) ; Langner, Andy (CERN) ; Papaphilippou, Yannis (CERN) ; Piselli, Emiliano (CERN) ; Trad, Georges (CERN) |
| Publication | 2016 |
| Number of pages | 5 |
| In: | International Beam Instrumentation Conference , Melbourne, Australia, 13 - 17 Sep 2015, pp.WEALA02 |
| DOI | 10.18429/JACoW-IBIC2015-WEALA02 |
| Subject category | Accelerators and Storage Rings |
| Abstract | During LHC Run 1 significant transverse emittance growth through the LHC cycle was observed. Measurements indicated most of the blow-up to occur during the injection plateau and the ramp. Intra beam scattering was one of the main drivers of emittance growth. However, finding a good wire scanner working point was difficult. Photomultiplier saturation added uncertainty on all measurements. A large discrepancy between emittances from wire scanners and luminosity was discovered but not solved. During Long Shutdown 1 the wire scanner system was upgraded with new photomultipliers. In April 2015 the LHC re-started with collision energy of 6.5 TeV per beam. This paper presents the first transverse emittance measurements through the LHC Run 2 cycle with low beam intensity. Comparisons with data from the synchrotron light monitors and the LHC experiments will be discussed and results summarized. In addition, a thorough study of wire scanner photomultiplier saturation will be presented. Finally, the emittance growth results will be compared to intra beam scattering simulations. |
| Copyright/License | CC-BY-3.0 |
Corresponding record in: Inspire
Element opprettet 2017-05-11, sist endret 2017-07-31
