De Cataldo, G.

Paper	Title	Page
TUP093	The ALICE Detector Control System, Ready for First Collisions	295
	A. Augustinus, M. Boccioli, P. Ch. Chochula, G. De Cataldo, L. Granado Cardoso, L. S. Jirden, M. Lechman, P. Rosinsky, C. Torcato de Matos, L. Wallet CERN, Geneva
	ALICE is one of the four experiments at the Large Hadron Collider (LHC), CERN (Geneva, Switzerland). The commissioning of the LHC in 2008 allowed the experiment to record the first particle induced events and is now preparing for the first collisions foreseen autumn 2009. The experiment is composed of 18 sub-detectors each with numerous subsystems that need to be controlled and operated in a safe and efficient way. The Detector Control System (DCS) is the key for this. The DCS system has been used with success during the commissioning of the individual detectors as well as during the cosmic runs and the LHC injection tests that were carried out in 2008. It was proven that through the DSC a complex experiment can be controlled by single operator. This paper describes the architecture of the Detector Control System and the key components that allowed to come to a homogeneous control system. Examples of technical implementations are given. Improvements that have beem implemented, based on a critical review of the first operational experiences are highlighted. It will report on the current status and operational experiences leading up to first physics collisions.
	Poster
WEP081	A Programmable Logic Controller-Based System for the Recirculation of Liquid C6 F14 in the ALICE High Momentum Particle Identification Detector at the Large Hadron Collider	1
	I. Sgura, A. Franco, C. Pastore INFN-Bari, Bari G. De Cataldo, P. Martinengo CERN, Geneva C. Dell'Olio, U. Fratino Università e Politecnico di Bari, Bari
	We present the design and the implementation of the Control System (CS) for the recirculation of liquid C6F14 in the HMPID. The HMPID is a sub-detector of the ALICE experiment at the CERN-LHC and uses C6F14 as Cherenkov radiator medium in twenty-one quartz trays for the measurement of the velocity of charged particles. The primary task of the Liquid Circulation System(LCS)is to ensure the highest transparency of C6F14 to ultraviolet light. In order to provide safe long term operation a PLC-based CS has been implemented. The CS supports both automatic and manual operating modes,remotely or locally. The adopted Finite State Machine approach minimizes the possible operator errors and provides a hierarchical control structure allowing the operation and monitoring of a single radiator tray. The LCS is protected against anomalous working conditions by both active and passive systems. The active ones are ensured via the control software running in the PLC whereas the human interface and data archiving are provided via PVSS, the SCADA framework which integrates the full detector control. The LCS has been fully commissioned over the last two years and proved to meet all requirements.