A control and monitor system for the liquid argon cryogenics of the calorimeter of the ATLAS detector

In a few weeks the Large Hadron Collider which is built at CERN will deliver its first beam. ATLAS (A Toro dal Large hadron collider ApparatuS [1]) is one of the four experiments whose aim is to analyze the products of the collisions. As many of these particle detectors, ATLAS is designed with four concentric layers which are, from inside to outside: the inner detector to measure the charged particles tracks, the electromagnetic calorimeter to measure the energy deposited by both electrons and ph otons, then the hadronic calorimeter and finally the muon detector. The active part of the electromagnetic calorimeter is a bath of liquid argon [2] whose large volume (78 m(3)) has to be maintained precisely at its operating temperature (about 88 K) by t he means of nitrogen circulation. In this paper we will describe how with industry-like control systems an application has been built for the command and the monitoring of the whole cryogenics equipment

The ThomX project status

Work supported by the French Agence Nationale de la recherche as part of the program EQUIPEX under reference ANR-10-EQPX-51, the Ile de France region, CNRS-IN2P3 and Université Paris Sud XI - http://accelconf.web.cern.ch/AccelConf/IPAC2014/papers/wepro052.pdfA collaboration of seven research institutes and an industry has been set up for the ThomX project, a compact Compton Backscattering Source (CBS) based in Orsay - France. After a period of study and definition of the machine performance, a full description of all the systems has been provided. The infrastructure work has been started and the main systems are in the call for tender phase. In this paper we will illustrate the definitive machine parameters and components characteristics. We will also update the results of the different technical and experimental activities on optical resonators, RF power supplies and on the electron gun