Author: Fuchsberger, K.
Paper Title Page
MOBL04 LHC Online Chromaticity Measurement - Experience After One Year of Operation 20
  • K. Fuchsberger, G.H. Hemelsoet
    CERN, Geneva, Switzerland
  Hardware and infrastructural requirements to measure chromaticity in the LHC were available since the beginning. However, the calculation of the chromaticity was mostly made offline. This gap was closed in 2015 by the development of a dedicated application for the LHC control room, which takes the measured data and produces estimates for the chromaticity values immediately online and allows to correct chroma and tune accordingly. This tool proved to be essential during commissioning as well as during every injection-phase of the LHC. It became particularly important during the intensity ramp-up with 25ns where good control of the chromaticity became crucial at injection. This paper describes the concepts and algorithms behind this tool, the experience gained as well as further plans for improvements.  
slides icon Slides MOBL04 [7.414 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOBL04  
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TUPG30 Testing the Untestable: A Realistic Vision of Fearlessly Testing (Almost) Every Single Accelerator Component Without Beam and Continuous Deployment Thereof 399
  • A. Calia, K. Fuchsberger, M. Hostettler
    CERN, Geneva, Switzerland
  Whenever a bug of some piece of software or hardware stops beam operation, loss of time is rarely negligible and the cost (either in lost luminosity or real financial one) might be significant. Optimization of the accelerator availability is a strong motivation to avoid such kind of issues. Still, even at large accelerator labs like CERN, release cycles of many accelerator components are managed in a "deploy and pray" manner. In this paper we will give a short general overview on testing strategies used commonly in software development projects and illustrate their application on accelerator components, both hardware and software. Finally, several examples of CERN systems will be shown on which these techniques were or will be applied (LHC Beam-Based Feedbacks and LHC Luminosity Server) and describe why it is worth doing so.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG30  
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