G. DeCataldo, D. DiBari, A. Franco, E. Nappi (INFN sez.
Bari), E. Carrone, M. Davenport, A. DiMauro, P. Martinengo,
F. Piuz, E. Schyns (CERN), Last updated:
September 13, 2002 Website Problem? Contact
The High Momentum Particle Identification Detector (HMPID) is based on a Ring
Imaging Cherenkov and it is one of the ALICE (A Large Ion Collider Experiment)
sub-detectors. It consists of a vessel containing C6F14 as liquid radiator and a multiwire
proportional chamber with a CsI segmented photocathode to detect Cherenkov photons
produced in the radiator by relativistic charged particles. The photon emission angle is
related to the particle velocity and if the momentum is known then the particle
identification can be done in the range 1-4 GeV/c.
In this report we present the integrated control system for the High
Voltage-Low voltage (HV-LV) and C6F14 re-circulation apparatus as well as the progress
compared to the first prototype already presented in .
This Detector Control System (DCS) is intended to configure, monitor and
operate in stand-alone mode for test and maintenance purposes, this sophisticated
detector. In addition it is designed to be fully integrated in the ALICE DCS.
The GRAFCET representation (GRAphe Fonctionel de Commande Etape/Transition) of
the HMPID DCS, the translation algorithm to convert part of it in an Instruction List for
PLC's, and finally its integration in the PVSS II, the CERN chosen SCADA system
(Supervisory Control And Data Acquisition), are presented. Two different OPC (OLE for
Process Control) servers are used to ensure the connectivity between the control software
and hardware device.
 The Detector Control System for the HMPID in the ALICE Experiment at LHC
G. De Cataldo for the ALICE Coll., LEB2000 Conference proceedings.
Last updated: September 13, 2002
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