Author: Dehning, B.
Paper Title Page
MOPC44 A Gigabit Ethernet Link for an FPGA Based Beam Loss Measurement System 178
  • M. Kwiatkowski, M. Alsdorf, B. Dehning, W. Viganò, C. Zamantzas
    CERN, Geneva, Switzerland
  A new Beam Loss Measurement (BLM) system is under development at the European Organisation for Nuclear Research (CERN) within the LHC Injector Upgrade (LIU) project. The multi-channel system will measure the beam losses from various types of detectors with a high precision and wide dynamic range. Several modes of data acquisition are supported. The data rate in the single-channel mode is 16 Mbps and in the multi-channel mode 128 Mbps. The Gigabit Ethernet link is implemented in an FPGA, which allows both a high throughput and a quick validation of the digital data processing algorithms using standard PCs in the initial stages of the development. Both TCP and UDP protocols were explored. The implementation of the Ethernet link is flexible and proved to be highly reliable, leading to its planned use in other measurement systems developed at CERN. The implementation details of the Ethernet link and the results achieved will be described in this paper.  
poster icon Poster MOPC44 [0.833 MB]  
MOPC45 A Prototype Readout System for the Diamond Beam Loss Monitors at LHC 182
  • E. Effinger, T. Baer, B. Dehning, R. Schmidt
    CERN, Geneva, Switzerland
  • H. Frais-Kölbl
    FH WN, Wiener Neustadt, Austria
  • E. Griesmayer
    ATI, Wien, Austria
  • P. Kavrigin
    CIVIDEC Instrumentation, Wien, Austria
  Diamond Beam Loss Monitors are used at the LHC for the measurement of fast beam losses. Results from specimen LHC loss measurements are presented in this talk. The bunch-to-bunch loss measurements make full use of the fast signal response of the diamond detectors with 1 ns time resolution and 6.7 ns double pulse resolution. The data processing is done with a dedicated readout system, which was designed and optimized for particular applications with the diamond beam loss monitors. This FPGA-based system provides on-line, real-time, and dead-time-free data processing. Several examples are presented: the Time Loss Histogram with 1.6 ns binning provides beam loss measurements that are synchronized with the revolution period throughout the full operational LHC cycle. The Post Mortem Recorder with a sampling frequency of 1 GS/s allows beam-loss-based tune estimates for all bunches in parallel. Future applications and upgrades are discussed.  
poster icon Poster MOPC45 [0.778 MB]  
TUPF03 Performance Assessment of Wire-Scanners at CERN 499
  • G. Baud, B. Dehning, J. Emery, J-J. Gras, A. Guerrero, E.P. Piselli
    CERN, Geneva, Switzerland
  This article describes the current fast wire-scanner devices installed in circular accelerators at CERN with an emphasis of the error studies carried out during the last two runs. At present the wire-scanners have similar acquisition systems but are varied in terms of mechanics. Several measurement campaigns were performed aimed at establishing optimal operational settings and to identify and assess systematic errors. In several cases the results led to direct performance improvements while in others this helped in defining the requirements for new detectors.  
poster icon Poster TUPF03 [1.040 MB]  
WEPC44 Operation of Silicon, Diamond and Liquid Helium Detectors in the Range of Room Temperature to 1.9 Kelvin and After an Irradiation Dose of Several Mega Gray 791
  • C. Kurfuerst, M.R. Bartosik, B. Dehning, T. Eisel, M. Sapinski
    CERN, Geneva, Switzerland
  • V. Eremin
    IOFFE, St. Petersburg, Russia
  At the triplet magnets close to the interaction regions of the LHC, the current Beam Loss Monitoring system is sensitive to the debris from the collision points. For future beams with higher energy and intensity, the expected increase in luminosity and associated increase of the debris from interaction products is expected to compete with any quench-provoking beam losses from the primary proton beams. In order to distinguish between the two, it is proposed to locate the detectors as close as possible to the superconducting coil. The detectors therefore have to be located inside the cold mass of the superconducting magnets in superfluid helium at 1.9 K. Past measurements have shown that in a liquid helium chamber, diamond and silicon detectors are promising candidates for cryogenic beam loss monitors. This contribution will show the results from new high irradiation beam measurements at both room temperature and 1.9 Kelvin to reveal the radiation tolerance of these different detectors.