Technical review onUPS power distribution

for LHC Beam Dumping System

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 implementationsTo come up with recommendations for effective solutions in the short and long terms

F. Formenti – UPS power distribution of LBDS

Brief introduction to the review

Reviewers:

Gerard Cumer EN/EL-OPpower electrical network including UPSs, operation, tests, fault analysis and performance

Wieslaw Iwanski PH/ESE-BEback end electronics systems for physics experiments, crates and power supplies infrastructures

Hugues Thiesen TE/EPC-MPCLHC commissioning electrical systems, power conversion, loads and ac distribution

Benjamin Todd TE/EPC-CCpower converter controls, formerly beam interlocks & machine protection systems

Jan Uythoven TE/ABT-BTPstudies of injection & extraction, transfer lines and beam dumping systems, beam physics, equipments and performance

Marc Vanden Eynden BE/CO-FERT 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