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Bergoz Beam Loss Monitor, BLM  
Tabs
 
Fast scintillation detector and pulse processing unit CBY01202, C48NA01B (with Beryllium window), C48YA01P (with Kapton window)The Bergoz Beam Loss Monitor (BLM) is a new approach to measure and localize beam losses. It uses two PIN photodiodes mounted face to face to detect charged particles. The charged particle passes through both PIN diodes, causing a coincidence in the detection circuitry. This makes it insensitive to synchrotron radiation photons that are generally stopped by the PIN diodes.

It's very small size and low cost make it possible to monitor all locations where beam loss is predicted. Vacuum quality around the storage ring may be based on the BLM count rate.

Cosylab BLM System with data acquisition and user interface
The BLM features
   •  Low cost
   •  Low spurious count rate: typically <1 in 10 seconds
   •  A dynamic range >108 for a count rate of up to 10MHz
   •  Fast recovery from a hit: typically <100ns
   •  TTL output for easy interfacing to counters
   •  Large PIN diodes may be user installed to change the detector solid angle.
   •  Rad-hard, tested to 108 Rads

 Specifications - BLM
  Singel Partical Detection Effiency  >30%
  PIN Photodiode Surface Area  7.34mm2
  Spurious Count Rate  <0.1Hz
  Maximum Count Rate  >10MHz
  Count Rate
    @ 6 x 105 Rad/yearSR Photons
    With 3cm Lead Shielding
 ~ 100Hz
 ~ 1Hz
  Output  TTL Positive Pulse
  Cable Drive Capability  > 200 meters of RG213
 Connectors
  Power and Signal  Female HE10, 10 pins (2 x 5)
 
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