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TY - CONF AU - Chitnis, P. AU - Brown, K.A. AU - Robertazzi, T.G. ED - Corvetti, Lou ED - Riches, Kathleen ED - Schaa, Volker RW TI - Understanding the Failure Characteristics of the Beam Permit System of RHIC at BNL J2 - Proc. of ICALEPCS2015, Melbourne, Australia, 17-23 October 2015 C1 - Melbourne, Australia T2 - International Conference on Accelerator and Large Experimental Physics Control Systems T3 - 15 LA - english AB - The RHIC Beam Permit System (BPS) monitors the anomalies occurring in the collider and restores the machine to a safe state upon fault detection. The reliability of the BPS thus directly impacts RHIC availability. An analytical multistate reliability model of the BPS has been developed to understand the failure development and propagation over store length variation. BPS has a modular structure. The individual modules have joint survival distributions defined by competing risks with exponential lifetimes. Modules differ in functionality and input response. The overall complex behavior of the system is analyzed by first principles for different failure/success states of the system. The model structure changes according to the type of scenario. The analytical model yields the marginal survival distribution for each scenario versus different store lengths. Analysis of structural importance and interdependencies of modules is also examined. A former Monte Carlo model* is used for the verification of the analytical model for a certain store length. This work is next step towards building knowledge base for eRHIC design by understanding finer failure characteristics of the BPS. PB - JACoW CP - Geneva, Switzerland SP - 382 EP - 385 KW - collider KW - simulation KW - ion KW - vacuum KW - controls DA - 2015/12 PY - 2015 SN - 978-3-95450-148-9 DO - 10.18429/JACoW-ICALEPCS2015-MOPGF129 UR - http://jacow.org/icalepcs2015/papers/mopgf129.pdf ER -