UPS power distribution for LHC Beam Dumping System Technical review on UPS power distribution for LHC Beam Dumping System

Brief introduction to the review Background: The LBDS front end crates have experienced a power failure in two occasions in 2012 triggering an asynchronous beam dump (fortunately w/o beam) In both cases the failure occurred in combination with a short circuit of a Wiener power supply input stage The upstream circuit breakers switched off and cut a larger part of the power distribution The initial power system architecture showed redundancy design weakness   As a result it was decided: To put together all people knowledgeable in the different domains of this system (beam dump, UPS, power network, power supplies, controls, reliability and redundant systems) To illustrate and debate all technical aspects and mitigation implementations To come up with recommendations for effective solutions in the short and long terms F. Formenti – UPS power distribution of LBDS

Wieslaw Iwanski PH/ESE-BE Reviewers: Gerard Cumer EN/EL-OP power electrical network including UPSs, operation, tests, fault analysis and performance Wieslaw Iwanski PH/ESE-BE back end electronics systems for physics experiments, crates and power supplies infrastructures Hugues Thiesen TE/EPC-MPC LHC commissioning electrical systems, power conversion, loads and ac distribution Benjamin Todd TE/EPC-CC power converter controls, formerly beam interlocks & machine protection systems Jan Uythoven TE/ABT-BTP studies of injection & extraction, transfer lines and beam dumping systems, beam physics, equipments and performance Marc Vanden Eynden BE/CO-FE RT embedded systems and S/W framework for LHC & injectors, support contract for Wiener crates and PSs for accelerators F. Formenti – UPS power distribution of LBDS

F. Formenti – UPS power distribution of LBDS