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Workshop on Machine availability and dependability for post LS1 LHC
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Europe/Zurich
874-1-11 (CERN)
874-1-11
CERN
CERN, 874-1-11
Description
Goal:
Following the initial work of the RSWG (reliability Sub Working Group) before LHC startup, many equipment teams are now revisiting their dependability calculations in light of the operational experience of the past 4 years and future upgrades and improvements of the systems. The main goal of this (CERN internal) workshop is to provide a forum for exchange and advertisement of the ongoing work as well as to discuss and guarantee the coherence of ongoing and future efforts. With the focus of LHC exploitation increasingly shifting towards machine availability, an attempt to quantify the impact of ongoing improvements and their effect on integrated luminosity in the post LS1 and HL-LHC era will be made. In addition the status and future needs for tools and methodologies to reliably track and quantify the dependability of equipment systems will be addressed.
Organizers:
Editor of Workshop Summary:
Organizers:
Andrea APOLLONIO,
Christophe MUGNIER,
Laurette PONCE,
Benjamin TODD,
Jan UYTHOVEN,
Jorg WENNIGER,
Daniel WOLLMANN,
Markus ZERLAUTH
Christophe MUGNIER,
Laurette PONCE,
Benjamin TODD,
Jan UYTHOVEN,
Jorg WENNIGER,
Daniel WOLLMANN,
Markus ZERLAUTH
Editor of Workshop Summary:
Benjamin TODD,
Laurette PONCE,
Andrea APOLLONIO
Workshop Secretaries: Laurette PONCE,
Andrea APOLLONIO
Armelle RUYS
Mariane CATALLON
Mariane CATALLON
Support
Participants
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INTRODUCTIONConvener: Dr Markus Zerlauth (CERN)
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1
Welcome addressSpeaker: Frederick Bordry (CERN)
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3
Dependability calculations prior to 2008 and operational experience during first LHC runThis presentation recalls the initial work done by the Reliability Working Group to assess the safety of the LHC machine protection system before its first operation. This study also provided numbers of machine availability for the systems studied. The initial estimate is compared with the LHC fault statistics presented at the different workshops across all systems. The importance of such studies and the role of the Availability Working Group for operation after LS1 are described.Speaker: Dr Jan Uythoven (CERN)
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1
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ONGOING IMPROVEMENTS FOR INCREASING THE AVAILABILITY FOR THE LHCConvener: Dr Jan Uythoven (CERN)
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4
CryogenicsThe LHC accelerator being based on superconducting devices, the availability of it’s cryogenic system is crucial for it’s global performance. From the beginning, monitoring our availability has been part of our standard practices, allowing for continuous progress. After briefly describing pre-LS1 facts and tools, we will describe what is being done during LS1 in perspective of restart conditions and performance post-LS1. We will present a specific focus on rotating machinery and logging methodology.Speakers: Eric Jean-Francois Duret (CERN), Mr Serge Claudet (CERN)
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5
Power convertersFrom the powering side, the biggest risk to LHC availability is the current FGC2 implementation, and its sensitivity to radiation. If we run as we are, we will likely abort almost every mission prematurely due to FGC2 failure. A next generation FGClite is being designed to replace the FGC2 in areas which are exposed to radiation. Of some 1600 Power Converter Controllers installed at CERN around 1100 will be replaced with FGClite. This presentation will outline the predicted performance of the FGClite in the post-LS1 era. It will outline the manner in the challenges are being addressed, and the implementation chosen for FGClite. Past and future performance comparison will be done.Speaker: Slawosz Uznanski (CERN)
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10:15
Coffee Break
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Availability of LHC Beam Instrumentation SystemsThe presentation will follow-up from the MPP Workshop in Annecy and cover reliability issues for BI systems at the LHC. Emphasis will be put on the interlocked systems (BLMs and SR6 BPMs) which have a direct impact on the beam permits while a general overview for other critical systems with lessons learn during LHC run #1 will be given.Speaker: Mr Lars Jensen (CERN)
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12:30
Lunch Break
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METHODS TO IMPROVE AVAILABILITYConvener: Dr Jorg Wenninger (CERN)
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LHC Availability Tracking Past and FutureThe LHC Availability Working Group has been looking into methods of exploiting machine and system availability metrics to optimise LHC physics production. This presentation outlines the key methods that have been identified for individually tracking equipment and machine availability in the 2010-12 period, from this the concept of an LHC Cardiogram has been produced, showing key availability information derived from operational logbooks, machine data and equipment experts. An extension of this method for capturing LHC availability information is outlined, called the LHC Systems Availability Tracker. This system will provide standardised availability metrics and profiles for equipment, and will provide the complete requirements, and proof of concept, for availability tracking which may be used in an integrated asset and event management tool. The proposed implementation and basic exploitation of the LSAT is shown. A road-map is given for; the AWG, the proposed implementation of the LSAT tool and links to the Maintenance Management Project.Speaker: Dr Benjamin Todd (CERN)
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16:00
Coffee Break
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Potentials of Petri nets for Availability Modeling and Analysis•Introduction •Dependability Modeling (Methods, Aspects) •Analysis and Prediction (Method and predictable parameters) •Tool: REALIST (Software Tool) •Large and Complex Systems (possibilities to deal with large systems) •Application Examples (from different applications in industry) •Summary & ConclusionsSpeaker: Dr Peter ZEILER
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Summary and DiscussionSpeaker: ALL
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