Author: Voumard, N.
Paper Title Page
WEPMU019 First Operational Experience with the LHC Beam Dump Trigger Synchronisation Unit 1100
  • A. Antoine, C. Boucly, P. Juteau, N. Magnin, N. Voumard
    CERN, Geneva, Switzerland
  Two LHC Beam Dumping Systems (LBDS) remove the counter-rotating beams safely from the collider during setting up of the accelerator, at the end of a physics run and in case of emergencies. Dump requests can come from 3 different sources: the machine protection system in emergency cases, the machine timing system for scheduled dumps or the LBDS itself in case of internal failures. These dump requests are synchronised with the 3 μs beam abort gap in a fail-safe redundant Trigger Synchronisation Unit (TSU) based on Digital Phase Lock Loops (DPLL), locked onto the LHC beam revolution frequency with a maximum phase error of 40 ns. The synchronised trigger pulses coming out of the TSU are then distributed to the high voltage generators of the beam dump kickers through a redundant fault-tolerant trigger distribution system. This paper describes the operational experience gained with the TSU since their commissioning with beam in 2009, and highlights the improvements which have been implemented for a safer operation. This includes an increase of the diagnosis and monitoring functionalities, a more automated validation of the hardware and embedded firmware before deployment, or the execution of a post-operational analysis of the TSU performance after each dump action. In the light of this first experience the outcome of the external review performed in 2010 is presented. The lessons learnt on the project life-cycle for the design of mission critical electronic modules are discussed.  
poster icon Poster WEPMU019 [1.220 MB]  
TUBAULT04 Open Hardware for CERN’s Accelerator Control Systems 554
  • E. Van der Bij, P. Alvarez, M. Ayass, A. Boccardi, M. Cattin, C. Gil Soriano, E. Gousiou, S. Iglesias Gonsálvez, G. Penacoba Fernandez, J. Serrano, N. Voumard, T. Włostowski
    CERN, Geneva, Switzerland
  The accelerator control systems at CERN will be renovated and many electronics modules will be redesigned as the modules they will replace cannot be bought anymore or use obsolete components. The modules used in the control systems are diverse: analog and digital I/O, level converters and repeaters, serial links and timing modules. Overall around 120 modules are supported that are used in systems such as beam instrumentation, cryogenics and power converters. Only a small percentage of the currently used modules are commercially available, while most of them had been specifically designed at CERN. The new developments are based on VITA and PCI-SIG standards such as FMC (FPGA Mezzanine Card), PCI Express and VME64x using transition modules. As system-on-chip interconnect, the public domain Wishbone specification is used. For the renovation, it is considered imperative to have for each board access to the full hardware design and its firmware so that problems could quickly be resolved by CERN engineers or its collaborators. To attract other partners, that are not necessarily part of the existing networks of particle physics, the new projects are developed in a fully 'Open' fashion. This allows for strong collaborations that will result in better and reusable designs. Within this Open Hardware project new ways of working with industry are being tested with the aim to prove that there is no contradiction between commercial off-the-shelf products and openness and that industry can be involved at all stages, from design to production and support.  
slides icon Slides TUBAULT04 [7.225 MB]