| Paper |
Title |
Page |
| TOAB03 |
ALICE Control System – Ready for LHC Operation
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65 |
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- A. Augustinus, M. Boccioli, P. Ch. Chochula, S. Kapusta, P. Rosinsky, C. Torcato de Matos, L. W. Wallet, L. S. Jirden
CERN, Geneva
- G. De Cataldo, M. Nitti
INFN-Bari, Bari
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ALICE is one of the four LHC experiments presently being built at CERN and due to start operations by the end of 2007. The experiment is being built by a very large worldwide collaboration; about 1000 collaborators and 85 institutes are participating. The construction and operation of the experiment pose many technical and managerial problems, and this also applies to the design, implementation, and operation of the control system. The control system is technically challenging, representing a major increase in terms of size and complexity with respect to previous-generation systems, and the managerial issues are of prime importance due to the widely scattered contributions. This paper is intended to give an overview of the status of the control system. It will describe the overall structure and give some examples of chosen controls solutions, and it will highlight how technical and managerial challenges have been met. The paper will also describe how the various subsystems are integrated to form a coherent control system, and it will finally give some hints on the first experiences and an outlook of the forthcoming operation.
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| WPPB32 |
Cybersecurity in ALICE DCS
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460 |
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- A. Augustinus, L. S. Jirden, P. Rosinsky, P. Ch. Chochula
CERN, Geneva
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In the design of the control system for the ALICE experiment much emphasis has been put on cyber security. The control system operates on a dedicated network isolated from the campus network and remote access is only granted via a set of Windows Server 2003 machines configured as application gateways. The operator consoles are also separated from the control system by means of a cluster of terminal servers. Computer virtualization techniques are deployed to grant time-restricted access for sensitive tasks such as control system modifications. This paper will describe the global access control architecture and the policy and operational rules defined. The role-based authorization schema will also be described as well as the tools implemented to achieve this task. The authentication based on smartcard certificates will also be discussed.
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| RPPA36 |
Handling Large Data Amounts in ALICE DCS
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591 |
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- A. Augustinus, L. S. Jirden, S. Kapusta, P. Rosinsky, P. Ch. Chochula
CERN, Geneva
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The amount of control data to be handled by the ALICE experiment at CERN is by a magnitude larger than in previous-generation experiments. Some 18 detectors, 130 subsystems, and 100,000 control channels need to be configured, controlled, and archived in normal operation. During the configuration phase several Gigabytes of data are written to devices, and during stable operations some 1,000 values per second are written to archival. The peak load for the archival is estimated to 150,000 changes/s. Data is also continuously exchanged with several external systems, and the system should be able to operate unattended and fully independent from any external resources. Much care has been taken in the design to fulfill the requirements, and this report will describe the solutions implemented. The data flow and the various components will be described as well as the data exchange mechanisms and the interfaces to the external systems. Some emphasis will also be given to data reduction and filtering mechanisms that have been implemented in order to keep the archive within maintainable margins.
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