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TY - CONF AU - Militsyn, B.L. AU - Angal-Kalinin, D. AU - Brynes, A.D. AU - Jackson, F. AU - Jones, J.K. AU - Kalinin, A. AU - McKenzie, J.W. AU - Muratori, B.D. AU - Noakes, T.C.Q. AU - Roper, M.D. AU - Scott, D.J. AU - Snedden, E.W. AU - Williams, P.H. ED - Petit-Jean-Genaz, Christine ED - Arduini, Gianluigi ED - Michel, Peter ED - Schaa, Volker RW TI - Beam Physics Commissioning of VELA at Daresbury Laboratory J2 - Proc. of IPAC2014, Dresden, Germany, June 15-20, 2014 C1 - Dresden, Germany T2 - International Particle Accelerator Conference T3 - 5 LA - english AB - A user facility VELA (Versatile Electron Linear Accelerator) based on an RF photoinjector has been commissioned at Daresbury Laboratory in April 2013, providing beam to first users in September 2013. Machine study runs in 2013-2014 have concentrated on characterisation of main beam parameters like bunch charge, its momentum, beam emittance and dependence of these parameters on the launching RF phase. Major efforts have been also concentrated on investigation of the dark current from the gun and its dependence on the RF amplitude. Significant time has been dedicated to investigation of relative stability of LLRF and drive laser having significant impact on the overall machine stability. We present here the results of these studies. PB - JACoW CP - Geneva, Switzerland SP - 2986 EP - 2988 KW - gun KW - emittance KW - laser KW - diagnostics KW - quadrupole DA - 2014/07 PY - 2014 SN - 978-3-95450-132-8 DO - 10.18429/JACoW-IPAC2014-THPRO052 UR - http://jacow.org/ipac2014/papers/thpro052.pdf ER -