• J.A. Uythoven, E. Carlier, L. Ducimetière, B. Goddard, V. Kain, N. Magnin
  CERN, Geneva

The LHC beam dump system was commissioned with beam in 2009. This paper describes the operational experience with the kicker systems and the tests and measurements to qualify them for operation. The kicker performance was characterized with beam by measurements of the kicker waveforms using bunches extracted at different times along the kicker sweep. The kicker performance was also continuously monitored for each pulse with measurement and analysis of each kick pulse, allowing diagnostic of errors and of long-term drifts. The results are described and compared to the expectations.

• B. Goddard, V. Baggiolini, W. Bartmann, C. Bracco, L.N. Drosdal, E.B. Holzer, V. Kain, D. Khasbulatov, N. Magnin, M. Meddahi, A. Nordt, M. Sapinski
  CERN, Geneva
• M. Vogt
  DESY, Hamburg

The quality of the injection into the LHC is monitored by a dedicated software system which acquires and analyses the pulse waveforms from the injection kickers, and measures key beam parameters and compares them with the nominal ones. The beam losses at injection are monitored on many critical devices in the injection regions, together with the longitudinal filling pattern and maximum trajectory offset on the first 100 turns. The paper describes the injection quality check system and the results from LHC beam commissioning, in particular the beam losses measured during injection at the various aperture limits. The results are extrapolated to full intensity and the consequences are discussed.