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Mr Ruediger Schmidt (CERN)20/01/2005, 15:00Machine Protection Issues affecting Beam CommissioningSafe operation of the LHC requires coherence across several systems for machine protection: collimators and beam absorbers, beam dumping system, beam monitoring, beam interlocks, etc. Beam operation requires beam permit that can only be established when all LHC systems are ready for beam operation. Extraction of beam from the SPS and transfer to the LHC requires correct settings of...Go to contribution page
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Dr Ralph Assmann (CERN)20/01/2005, 15:30Machine Protection Issues affecting Beam CommissioningAn inventory of all collimators and beam absorbers in the LHC ring is presented. The required settings of the various devices are discussed, the roles in beam cleaning and machine protection are explained and limitations are explored. A basic strategy for commissioning of all collimators and absorbers is explained, including a specification on the necessary prerequisites on optics,...Go to contribution page
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Dr Stefano Redaelli (CERN)20/01/2005, 16:15Machine Protection Issues affecting Beam CommissioningThe LHC aperture for the perfect machine and its dependence on various optics imperfections are discussed. The optics tolerances required to meet the desired performance of the LHC collimation system are given. These studies are based on the results of tracking simulations of the beam halo and on a detailed aperture model of the full LHC ring, with spatial resolution of 10 cm over...Go to contribution page
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Dr Rhodri Jones (CERN)20/01/2005, 16:40Machine Protection Issues affecting Beam CommissioningoralThe beam loss monitoring system will be the main instrument charged with detecting and acting upon the majority of failures that could lead to quenches or damage. In a few cases, however, additional instrumentation is required to protect the machine. Three such systems will be discussed along with their proposed implementation,namely: the beam dump channel position interlock in IR6,...Go to contribution page
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Dr Jorg Wenninger (CERN)21/01/2005, 09:00Machine Protection Issues affecting Beam CommissioningoralAt the LHC the machine protection and interlock systems will be major players that need to keep track with the evolution of the machine in terms of beam energy and intensity. At the start of beam commissioning, many protection systems will already be partially commissioned. This presentation will outline the state of the various protection systems at the start of beam commissioning and...Go to contribution page
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Dr Paul Collier (CERN)21/01/2005, 09:25Machine Protection Issues affecting Beam CommissioningoralThe beams in the LHC can be intercepted by many different types of objects moving into the vacuum chambers. These include devices designed for beam monitoring,machine protection and for data taking by the experiments. Moving these objects can only be permitted under certain conditions. Interlocks should prevent quenches or even damage in case of wrong actions. A complete inventory...Go to contribution page
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Dr Jan Uythoven (CERN)21/01/2005, 09:50Machine Protection Issues affecting Beam CommissioningoralThe primary task of the machine protection system is to prevent equipment damage. To guarantee the required system reliability the subsystems have evolved in large andoften complex systems. As a result the machine protection system could become a major cause of machine downtime by triggering too many false beam dumps. The talk will present the major components of the machine...Go to contribution page
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Dr Andrzej SIEMKO (CERN AT-MTM)21/01/2005, 10:35Machine Protection Issues affecting Beam CommissioningAn accurate prediction of the quench levels of the main ring superconducting magnets will allow a preventive dump of the beam before the magnet quench based on beam loss measurements with beam loss monitors, thus limiting the downtime of the machine. The particle energy deposition in the coils is calculated by using simulation programs like GEANT or FLUKA. The magnet quench level as a...Go to contribution page
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Verena Kain (CERN)21/01/2005, 11:00Machine Protection Issues affecting Beam CommissioningoralThe design of protection elements is based on assumptions on damage levels, which are in general derived from computer simulations. A dedicatedexperiment was carried out to cross-check the extracted from the SPS in TT40, deliberate damage of material was done in a controlled way. A simple geometry was chosen for the high-Z target comprising several typical materials that are used in...Go to contribution page
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