Carlier, E.

Paper	Title	Page
WEC001	Commissioning of the Control System for the LHC Beam Dump Kicker Systems	391
	E. Carlier, A. Antoine, C. Chanavat, B. Goddard, V. Kain, N. Magnin, J. A. Uythoven, N. Voumard CERN, Geneva
	The beam dumping system of the Large Hadron Collider (LHC) provides a loss-free fast extraction of the circulating beams. It consists per ring of 15 extraction kickers, followed by 15 septum magnets, 10 dilution kickers and an external absorber. A dump request can occur at any moment during the operation of the collider, from injection energy up to collision energy. All kickers must fire synchronously with the beam abort gap to properly extract the whole beam in one single turn into the extraction channel. Incorrect operation of the extraction kickers can lead to beam losses and severe damage to the machine. The control system of the LHC beam dump kickers is based on a modular architecture composed of 4 different sub-systems, each with a specific function, in order to detect internal failures, to ensure a correct extraction trajectory over the whole LHC operational range, to synchronise and distribute dumps requests, and to analyse the transient signals recorded during the beam dumping process. The control architecture is presented and the different steps performed for its validation, from the individual sub-systems tests to the final commissioning with beam, are described.
WEP065	The Low-Level Control System for the CERN PS Multi-Turn Extraction Kickers	528
	J. Schipper, B. Bleus, C. Boucly, E. Carlier, T. Fowler, H. Gaudillet, R. Noulibos, L. Sermeus CERN, Geneva
	To reduce the beam losses when preparing high intensity proton beam for the CERN Neutrino to Gran Sasso (CNGS) facility, a new Multi-Turn extraction (MTE) scheme has been implemented in the PS, to replace the present Continuous Transfer (CT) to the SPS. Prior to extraction the beam is separated in phase space into a central core and four islands by means of non-linear magnetic elements. Each beamlet is then ejected from the PS using fast kickers and a magnetic septum. Industrial off-the-shelf components have been used for the low-level part of the MTE kicker control system. National Instruments PXI systems are used to control the high voltage pulse generators and a SIEMENS programmable logic controller (PLC) handles the centralised oil cooling and gas insulation sub-systems. The different types of low-level controllers are linked via Ethernet to a VME Front-End Computer (FEC) which serves as interface to the higher layers of the accelerator control system. The publication of the various equipment functions to the application layer is performed through generic object oriented classes developed with the CERN Front-End Software Architecture (FESA), deployed at the FEC level.
	Poster