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

2. Brief introduction to the review
Background:
The LBDS front end crates have experienced a power failure in two occasions in 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

3. 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

4. F. Formenti – UPS power distribution of LBDS