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Overview | Downloads | Pricing |               BLM connected with IOC


K. Wittenburg was awarded the Faraday Cup in 2000 for the design of the PIN-photodiode Beam Loss Monitor and its implementation at HERA.


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The Beam Loss Monitor (BLM) is a new approach to measure and localise beam losses.
Its very small size and low unit cost make it possible to monitor all locations where beam loss is predicted.
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BLM features:

  ■  Up to 10 MHz count rate
  ■  Dynamic range > 1E8
  ■  Spurious count very low
  (Less than 1 count in 10 seconds)
  ■  Recovers 100 ns after a hit.
  ■  Choice of detector solid angle
  (Large or small PIN-diodes)
  ■  Output is a TTL compatible pulse, for easy counting
  ■  Withstand up to 1E8 Rads radiation
  ■  Vacuum distribution can be measured based on BLM count rate
  ■  Two PIN-photodiodes mounted face-to-face detect charged particles.
  Coincidence counting make it insensitive to synchrotron radiation

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The charged particle crosses both PIN-diodes, which causes a coincidence.
Synchrotron radiation photons, if stopped by the first PIN-diode, do not cause a coincidence.