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Job Code EN881
Description
The Low Voltage electrical supply of the electronics racks for the 4 LHC Experiments is currently monitored and controlled by PLC concentrators which interface with different architectures the electrical breakers feeding the racks. Each PLC communicates via Modbus protocol with the DCS - Detector Control System - which is a SCADA system used by the Experiments and dedicated, among many things, to monitor and control the power supply of their racks. In 2004 a communication structure between DCS and PLC concentrators was defined, allowing DCS programmers to develop an application to exchange information with the PLCs. It was based on only 2 types of electrical distribution: 1. In the case of ATLAS and CMS each rack is supplied from a CANALIS transport system through a breaker enclosed in a box, monitored and controlled by a PLC, named Protection PLC. The concentrator PLC communicates with each Protection PLC (one per rack) using Modbus protocol. 2. In the case of ALICE and LHCb the electrical supply is based on TDM (Tableau modulaire de Distribution) type switchboards and breakers. The PLC concentrator interfaces each breaker by direct cabling. Since 2004 the electrical supply to the racks has increased using different types of distribution, especially in the 2 biggest Experiments (ATLAS and CMS). The communication protocol defined in 2004 is now obsolete and the DCS application (RCA: Rack Control Application) has to be continuously modified to adapt to the modifications in the PLC concentrators, every time a new electrical distribution is implemented. Project Description The student will participate to the definition of a new communication structure DCS-PLC, to be implemented in the PLC programs and it will accurately document it. The main objective for this new structure is to allow the RCA in the DCS to automatically determine the types of distribution supplying the racks without having to continually adapt to the extension of the electrical supply.
Special Requirements
Some knowledge in PLCs
Training Value
For this project the student will acquire the knowledge of the different electrical networks and distributions in the 4 Experiments, the different PLC system architectures, the PLC programs (Schneider PLC type Premium, with PL7Pro/Unity software platforms) and the communication tables. He will work in the CERN electrical Group and, more precisely, in the Controls section, responsible for the monitoring and control of the whole CERN Electrical Network. The Experiment PLCs communicate also with the electrical SCADA ENS system (Efacec-SCATEX). He will implement and test the modifications at the SCADA level. This will allow the student to acquire knowledge of the ENS, in terms of main hardware and software components, databases and communication protocols. He will be responsible for the correct implementation in the PLC concentrators (currently 11 PLCs installed) of the new communication structure, making sure it corresponds to the requirements defined, for communication tests between PLC and DCS and tests documentation.
Supervisor
SONIA INFANTE

Job Code PH108
Description
The trainee will work together with A. Tsirou (responsible for the trainee) in continuing studies and tests for the development of a miniaturized warm mirror dewpoint sensor to be used in future CMS Tracker upgrades and for sLHC instrumentation. The trainee will continue in order to optimize an already built working prototype by a previous technical student (P.Sarafis). The prototype will be tested under sLHC irradiation does; the trainee will have to focus on studies on the controlling Peltier element which is part of the sensor and on developing a cheap radiation resistive form for it based on commercially available parts; the chilled mirror control will have to be developed/adapted in a way that the chilled mirror sensor will be directly integrable in a PLC system, a widely used practice at CERN for safety critical systems. The trainee will have a lot of exposure to diverse technical problems having to do with developing environmental sensors for the sLHC environment and to techniques and tools for developing possible solutions and testing them.
Special Requirements
Interest in developing integral systems rather than single pieces of hardware; special interests in detailed studies of radiation effects. As a side development the trainee will become familiar with standard industrial PLC applications.
Training Value
1) Become familiar withstandard industrial PLCs and their development environments. (We are almost exclusively based on the SIEMENS S7 300 family. 2) Familiarize with environmental sensor technologies and technical particularities relevent to the environment of the CERN experimental facilities and experiments
Supervisor
ANDROMACHI TSIROU

Job Code TE1842
Description
In the framework of the luminosity upgrade program of the LHC, CERN is constructing a new Linac. Linac4 will be a linear accelerator for negative Hydrogen ions (H-) which will replace the old Linac2 as linear injector for the CERN accelerators. In the period 2009-2011 the design and construction of the magnet systems for this machine will be made. A fellowship post for an engineer or applied physicist will be opened soon for this project. The post will be in the Magnets, Superconductors & Cryostats (MSC) group of the CERN Technology (TE) department. The main task will be to participate in the design and construction of the Linac4 magnet system. This implies giving important contributions to the electromagnetic design and mechanical design as well as an active participation in the manufacturing follow-up and testing of prototype magnets.
Special Requirements
University degree or equivalent in electrical engineering or in applied physics. A PhD could be an advantage. Knowledge and some experience with magnets and magnetic materials. Knowledge and some initial experience with finite element computations techniques would be an asset. Good team working abilities. Good knowledge of English or French and a basic knowledge of the other language.
Training Value
This position will give the applicant an opportunity to gain experience in electromagnetic design and to acquire a good background in magnet engineering.
Supervisor
THOMAS ZICKLER