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TY - CPAPER AU - Kuhn, M. AU - Antoniou, F. AU - Bravin, E. AU - Dehning, B. AU - Emery, J. AU - Kain, V. AU - Langner, A. AU - Papaphilippou, Y. AU - Piselli, E. AU - Trad, G. TI - First LHC Emittance Measurements at 6.5 TeV J2 - Proc. of International Beam Instrumentation Conference (IBIC2015), Melbourne, Australia, 13-17 September 2015 AB - 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. PB - JACoW CY - Geneva, Switzerland SP - 562 EP - 566 KW - emittance KW - injection KW - luminosity KW - simulation KW - radiation DA - 2016/01 PY - 2016 SN - 978-3-95450-176-2 DO - 10.18429/JACoW-IBIC2015-WEALA02 UR - http://accelconf.web.cern.ch/AccelConf/IBIC2015/papers/weala02.pdf ER -