| Paper | Title | Page |
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| WEC001 | Commissioning of the Control System for the LHC Beam Dump Kicker Systems | 391 |
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| 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. | ||
| WEC002 | Jefferson Lab IEC 61508/61511 Safety PLC Based Safety System | 394 |
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Funding: Authored by Jefferson Science Associates, LLC under U. S. DOE Contract No. DE-AC05-06OR23177. This paper describes the design of the new 12 GeV Upgrade Personnel Safety System (PSS) at the Thomas Jefferson National Accelerator Facility (TJNAF). The new PSS design is based on the implementation of systems designed to meet international standards IEC61508 and IEC 61511 for programmable safety systems. In order to meet the IEC standards, TJNAF engineers evaluated several SIL 3 Safety PLCs before deciding on an optimal architecture. In addition to hardware considerations, software quality standards and practices must also be considered. Finally, we will discuss R&D that may lead to both high safety reliability and high machine availability that may be applicable to future accelerators such as the ILC. |
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| WEC003 | Alba, the PLC Based Protection Systems | 397 |
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| Both Personnel Safety System (PSS) and Equipment Protection System are based on PLCs. The PSS is an independent system based on Pilz Safety PLCs designed to match the Safety Integrity Level 3 defined in the norm IEC 61508. The EPS uses B&R PLCs with distributed periphery located inside the Tunnel and BL Hutches. Most of the code is defined from the cable database. The cableDB is a MySQL database containing a complete information on equipments and cables and from which, besides the reports for cabling installation, most code for PLCs, device servers and expert GUIs are automatically generated. The EPS is complemented with a redundant faster protection system based on the Timing devices and transmitted over Fiber optics. | ||
| WEC004 | IEC 61508 Experience for the Development of the LHC Functional Safety Systems and Future Perspectives | 400 |
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Funding: CERN 1211 Geneva 23 This paper summarises the experience gained during the development of the personal protection systems of the LHC and more particularly the feedback of the use of the IEC 61508 functional safety standards. The paper drafts also the guidelines for the development of the future functional safety systems at CERN. After an introduction on the legal aspects and responsibility of the various stakeholders implied in the development of a safety system, the paper describes the functional safety life cycle applied and experience gained in each stage of the process; covering topics such as : the preliminary risk analysis, the definition of the safety functions, the probabilistic analysis of the architecture implementing the safety function, the verification and validation process, the maintenance strategy, and the validation of the system by the external safety Authority. The perspective of the applicability of the new nuclear branch safety standard IEC 61513 is also introduced. |
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| WEC005 | An Overview of the ITER Central Interlock and Safety Systems | 403 |
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| Many systems that make up the ITER machine have to respect stringent requirements in terms of reliability, availability, safety and maintainability either for the protection of people, the environment or the safe operation of the machine. International standards have been selected to manage the lifecycle of the different types of systems, to harmonize the work that is carried out in the countries of the seven ITER partners and to satisfy the French safety regulations. These systems usually have the basic means of local self protection designed into it from its conception. Additional levels of protections are provided by the Central Interlock System and the Central Safety System for those combinations of systems' conditions that are dangerous, even though each system may be within its own safe limits. The Central Interlock System deals with the safe operation of the machine while the Central Safety System deals with the protection of the people and the environment. This paper gives an overview of the Central Interlock and Safety Systems based on the current requirements, the survey of the protection systems and the application of international standards. | ||
| WEC006 | The Accelerator Protection System Based on Embedded EPICS for J-PARC | 406 |
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| There is the 4 output beam line at the MainRing(MR) in J-PARC. The Accelerator protection system (MPS-MR) watches the devices which deals with destination of the beam. Then, the heart for the logic judgment carries out the complicated logic treatment using FPGA (Virtex-4 FX). This FPGA takes in destination information of the beam, and the logical operation with trouble information is carried out to make an output. Then, the FPGA takes in the information on the destination of the beam using the LAN. In addition, information of the abnormal equipment which becomes the reason for the beam to be stopped is sent to OPI using the LAN. By giving PowerPC core to realize this communication function in the FPGA, LINUX+EPICS is operated on the PowerPC core. Though there are both logic processing unit and CPU on one element, because, the information transfer in high speed between logic processing unit and CPU is possible without requiring the complicated external wiring. In this reason, the system can be very efficiently constructed. This paper describes the detail of the design and the implementation, as well as the experiences of the system in the operation of the J-PARC MR. |