The HERMES silicon project - The radiation protection system

M. G. Van Beuzekom, O. Bouhali, V. Mexner, S. Mos, A. Reischl, J. J.M. Steijger

Research output: Contribution to journalConference article

1 Citation (Scopus)


The HERMES-detector has recently been upgraded with a silicon detector called the Lambda Wheels. This is the first detector following the interaction region. It consists of two disks of silicon detectors close to the beamline. This location makes it vulnerable to increased radiation levels which may be caused by beam instabilities. The Lambda Wheel detector, therefore, contains a system to detect these instabilities. This additional system triggers a kicker which dumps the HERA-lepton beam when the radiation level becomes too high. This contribution describes the radiation monitor which consists of two sets of three ionization chambers each, and the data-acquisition system which reads them out. The system has been installed and is operational since the summer of 2001. The HERA-accelerator was being commissioned after an upgrade during this time and several kinds of beam instabilities were observed with this protection system. The characteristics of some events will be described.

Original languageEnglish
Pages (from-to)44-51
Number of pages8
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1-2
Publication statusPublished - 11 Oct 2003
Externally publishedYes
EventProceedings of the 9th European Symposium on Semiconductor - Elmau, Germany
Duration: 23 Jul 200227 Jul 2002



  • Accelerated beams
  • Ionization chambers
  • Radiation protection
  • Silicon strip detectors

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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